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MICROVITEC SERVICE MANUAL

1. 3 Line Oscillator Phase Detectors A line oscillator is timed by a network of resistors and capacitors on pins 14 and 1 5 of IC201 used to derive a pulse of suitable mark space ratio for driving line output stages IC201 contains two basic control loops each containing a phase detector 1 The first phase detector compares output of the line oscillator with the incoming line sync pulse 2 3 Phase detector output on pin 13 is filtered and fed to the voltage control input of the oscillator on pin 15 The second phase detector compensates for delays introduced by the line output stage and compares line flyback pulses at pin 6 with oscillator output Phase detector output consists of a bi directional current source used to charge discharge C213 on pin 5 Voltage derived from C213 is used to control a phase shifter which regulates the phase of the output pulse on pin 3 Pin 5 also provides a line shift function by offsetting voltage developed across C213 charged from VR220 R221 and R222 allowing phase shift of or 1uS between line scan and video information A 705 gate pulse from the line oscillator whose phase position is centred around the horizontal sync pulse The gated pulse is used to control the arrival of sync pulses at the sync phase detector for a duration of 7uS allowing latching and de latching of line oscillator Obtained by a coincidence detector which compares the phase gate pulse with that o
2. 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1441 AL 1441 AS 1441 MS 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1241 AS 1446 LF 1446 LI2 1456 LI2 1241 AT 005 0 OMPONENT DESCRIPTION LINKS 2 x 14mm CHOKE OREGA 88545 00 TRANSFORMER SWITCH MODE ISOLATING PC5287 OR PC5307 TRANSFORMER SWITCH MODE ISOLATING PC3960 TRANSFORMER LINE DRIVER PC4163 TRANSDUCTOR EAST WEST PC3396 TRANSFORMER LINE OUTPUT 14 PC3755 TRANSFORMER LINE OUTPUT 20 THERMISTOR PTH45LC09 BG8ROH140 THERMISTOR 263100P2332T333 COMP MODEL NO PART NO COMPONENT DESCRIPTION REF PL3 PL101 PL102 PL103 PL103 PL201 1496 LI2U 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 5 1439 MS 1441 AL 1441 AS 1441 MS 1441 MS 4 2030 CS5 2031 CS5 2031 AX 2032 AM 1486 LI2U 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 LI2 1241 AT 2030 CS5 1431 4 1431 AP DS 1435 MS 1451AP MS4 1449 AS KP0300D05 0026 10 0025 05 0025 10 0026 10
3. 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1439 MS 1441 MS4 1451AP MS4 1451 MS4 1451 MQ3 1451AP DS 1451 DS 1456 LI2 2030 CS5 2031 CS5 2031 AX 2032 AM LW154SK2 LW154UA5 1496 LI2U 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1439 MS 1441 MS4 1451AP MS4 1451 MS4 1451 MQ3 1451AP DS 1451 DS 1456 LI2 2030 CS5 2031 CS5 2031 AX 2032 AM LW154SK2 5uH IN SERIES WITH R925 CHOKE 15uH 78108 1153 15uH IN SERIES WITH R926 CHOKE 15uH 78108 1153 C OMP REF L901 L924 MODEL PART NO COMPONENT DESCRIPTION NO 1496 LI2U 1431 AP MS4 1431AP DS 1431 AS 1432 AS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1435 MS 1436 LS1 1436 MS4 1439 5 1439 MS 1451 AS 1451 MS4 1451 MQ3 1451AP MS4 1451AP DS 1451 DS 1456 LI2 2030 CS5 2031 CS5 2031 AX 2032 AM LW154SK2 LW154UA5 1496 LI2U 1431AP MS4 1431AP DS 1431 AS 1432 5 1431 BS 1431 LS1 1431 M23 1431 M24 1431 4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439
4. 191 39V1d38 SIA SIA 11NV3 40 3SNVI HSl18V1S3 OL S323H2 YIHLUNA S3HINDIY HOLINOW LINOHID LHOHS SAN3INOdINOO 353 1 ON VII SSOBIV LNdLNO 23 2 ANNYI LOL SI DI 493H2 HOLINOW 1531 5 19384809 JOVIIOA SI S1NANOdWOJ SIA ON COCHL NO ANNY 39v1438 S110A YOLIATION ADIHI SIA SJA TANYA 40 ISNVI 5119 153 OL LA LTAVA SLN3NOdIWNOO 3HV 410344090 39 1 SI 1938809 JOVLIOA SI 928 NO SLIOA 21 S404H0D z gt CL ONSEN VEG NIIND S110A 81 04 X 3L HOW 1021 423H2 5 YOLINOW JHNLIId ON SVH HOLINON HOLINOW 1531 XVOS HOLLNON 1531 XV05 X 1407 32v1d38 32V 1438 SIA LINvd 30 35092 I6I49VI53 OL UNS G23H2 H3HLHNH ON 1U0HS XLdOT SI ON X93H3 S3HINDAIH HOLINOW EALINVA TOT HAL Si ZOCHL A03H0 H31dlH NO WOVE QV31 HOLINOW 1531 NYOS HJidlHL 30v1d38 SJA 1N3s38d 1115 JILSIHM INIT 431941441 Qv31 ANB JAOWAH ama YO N33u5 038 JO 55392 3 NV 393HL 51 HOLINON 1531 AVOS S HOLSISNVHL ALINVA JOVIdIY 83A HOLINOW 1 MVOS 1 531 AVOS UNV ALINVA 4 18 14322 SI SIN3NOdWOJ SINANOdWOJ 3S3HL LION UOJ 423H2 822 LZO ALINVS 301424 ON 4311SIHAA JAVH MON HOLINON JHL 5300 NO HOLIMS
5. KL4838Z02 SOCKET SHORTING 7859 02 TEST LINK 10 4838 PRESSAC COMP REF MODEL NO PART COMPONENT DESCRIPTION TL101 106 2030 CS5 2031 AX 2032 AM 1431AP MS4 1431 AS 1432 5 1431 5 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 5 1441 AL 1441 AS 1441 MS 1441 MS4 1486 LI2U 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 LI2 1241 AT KP0024A03 3 WAY PLUG 20 3423 COMP REF MODEL NO PART NO COMPONENT DESCRIPTION TH2 1496 LI2U 2030 CS5 2031 CS5 2031 AX 2032 AM 1439 AS 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1441 AL 1441 AS 1441 MS 1441 MS4 1486 LI2U 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1241 AS 1446 LF 1446 LI2 1456 LI2 1241 AT RTOO3NNO THERMISTOR 15 OHMS 30 K231 COMP MODEL PART NO REF MO LM0001UA1 T2 T2 T201 T202 T203 T203 110004106 14961 120 1486 0120 71002800 110009101 110003101 110007101 2030 CS5 2031 CS5 2031 AX 2032 AM 0016101 1496 LI2U 1486 LI2U 002010 2030 CS5 2031 CS5 2031 AX 2032 AM 1431AP MS4 1431AP DS
6. RF392DJO RF221DJO RW103XJ5 RW103VJ5 RF274DJO RF102DJO R0150LJO RW472ZJ5 RW103XJ5 RW333RJO RW103VJ5 RG336GJO RF394GJO RF392DJO RF682DJO RF104DJO RF683DJO RF224DJO R0470UO RL470GJO RF125DJO RF185DJO RF684DJO WL2214TU1 COMPONENT DESCRIPTION 100K CARBON COMP RESISTOR 10 0 5W AXIAL 180K CARBON FILM RESISTOR 5 1W AXIAL 3K9 CARBON FILM RESISTOR 5 0 25W AXIAL 2K7 CARBON FILM RESISTOR 5 0 25W AXIAL 3K5 CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 CARBON FILM RESISTOR 5 0 25W AXIAL 3K3 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARB MIN H MTG 20 0 1W AXIAL 10K CARBON FILM RESISTOR 5 0 25W AXIAL 6K3 CARBON FILM RESISTOR 5 0 25W AXIAL 8K2 CARBON FILM RESISTOR 5 0 25W AXIAL 15K WW RESISTOR 5 7W RADIAL 47R CARBON FILM RESISTOR 5 0 25W AXIAL 3K3 CARBON FILM RESISTOR 5 1W AXIAL 22K CARBON FILM RESISTOR 5 0 5W AXIAL 56K CARBON FILM RESISTOR 5 0 5W AXIAL 390R CARBON FILM RESISTOR 5 0 25W AXIAL 22R CARBON FILM RESISTOR 5 0 25W AXIAL 1K WW RESISTOR 5 9W RADIAL 1K WW RESISTOR 5 7W RADIAL 27K CARBON FILM RESISTOR 5 0 25W AXIAL 100R CARBON FILM RESISTOR 5 0 25W AXIAL 1R5 METAL OXIDE RESISTOR 5 2W AXIAL 470R RESISTOR 5 1 1W RADIAL 1K WW RESISTOR 5 9W RADIAL 3K3 WW RESISTOR 5 5W RADIAL 1K WW RESISTOR 5 7W RADIAL 3M3 METAL GLAZE RESISTOR VDE BS415 APPROVED 5 0 5W AXIAL 39K CARBON FILM RESISTOR 5 0 5 AXIAL 390R CARBON FILM RESISTOR 5 0 25W AXIAL 680R CARBON FILM RESI
7. RF472DJO RK222GKO RK105GKO RF475DJO RK825GKO RQ226CL2 RF155JJO RF185JJO RF185JJO RF225JJO RF474JJO RL102GJO RF273DJO CX225NL6 CY103NL6 CD472YL6 CM104TL6 CD472YL6 CM554RK6 CM105NL6 CA108RM7 CA288QM7 CA476HM6 CM105RL6 CD473KK6 COMPONENT DESCRIPTION 2K7 CARBON FILM RESISTOR 5 0 25W AXIAL 470K CAPBON FILM RESISTOR 5 0 25W AXIAL 820K CARBON COMP RESISTOR 10 0 5W AXIAL 2M2 PRESFT POT CARR H MTG 20 N 15W 180K CARBON FILM RESISTOR 5 1W AXIAL 150K CARBON FILM RESISTOR 5 1W AXIAL 1K PRESET POT CARB MIN MTG 20 0 1W AXIAL 1K CARBON FILM RESISTOR 5 0 25W AXIAL 2K2 PRESET POT CARB MIN H MTG 20 0 1W AXIAL 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARB MIN H MTG 20 0 1W 1 5K METAL OXIDE RESISTOR 5 2W AXIAL 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 PRESET POT CARB MIN H MTG 20 0 1W 100R FUSIBLE METAL FILM RESISTOR 5 0 5W AXIAL 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARB MIN H MTG 20 0 1W 47K CARBON FILM RESISTOR 5 1W AXIAL 1 5K METAL OXIDE RESISTOR 5 2W AXIAL 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 PRESET POT CARB MIN H MTG 20 0 1W 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARB MIN H MTG 20 0 1W 47K CARBON FILM RESISTOR 5 1W AXIAL 15K METAL OXIDE RESISTOR 5 2W AXIAL 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 PRESET POT CARB MIN H MTG 20 0 1W 100R FUSIBLE METAL FILM RESISTOR 5 0 5W AXIAL 470R CARBON FILM RESISTOR 5 0 25W AXIAL 220
8. TR202 COLLECTOR with 100 to 1 scope probe EHT Supply 1 23 5 required for CRT is generated by a tripler module driven from 7 5kV overwind on I 203 Inductance of the transformer between primary and overwind is tuned to the 7th harmonic of the flyback frequency by tripler input capacitance and self capacitance of the overwind 2 breathing performance of the display is further improved by deriving a high focus potential from a resistive thick film substrate potential divider from the EHT giving rise to a constant bleed current from EHT thus lowering output impedance of the EHT circuit 3 extra input diode within the tripler has its anode connected to the tube base ground and via a beam current sensing circuit to OV C223 and a network of resistors provide a load for the diode and effectively damp out ringing which may occur during scan The resulting 1000V which occurs across C223 is used to generate A1 potential across CRT C HT Supply 1 Derived from the main secondary winding of the switch mode power supply via R231 R231 is chosen to optimise picture breathing performance and offer protection to TR202 during CRT flashover FIELD TIMEBASE DESCRIPTION AND OPERATION The field timebase s carried out by 2C 2 gt s determined by VR307 R308 and C303 produ j 2 5 3 atpin 12 s ved from potential across C305 and C306 as ange to
9. 1451 AS 1451 MS 1451AP MS4 1451AP DS 1451 DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 LI2 1241 AT KS0003Y01 FUSEHOLDER L222 K 1496 LI2U 1486 LI2U KSO006Y01 FUSE CLIP PCB MTG 6 3mm FH3A B COMP REF MODEL PART NO COMPONENT NO DESCRIPTION F2 2031 AX 2032 AM 1431 AS 1432 AS 1431AP MS4 1431AP DS 1439 AS 1439 MS 1451 AS 1451 MS 1451AP MS4 1451AP DS 1451 DS 1241 AS 1446 LF 1446 LI2 1456 LI2 1241 AT KA2001BAO FUSE 2AMP 20mm TIME DELAY F3 2031 AX 1431 AS 1432 AS 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1439 MS 1441 AL 1441 AS 1441 MS 1441 MS4 1451 AS 1451 MS 1451AP MS4 1451 DS 1446 LF 1449 AS 1241 AS 1446 LF 1446 LI2 1456 LI2 1241 AS KA1001BQO FH1 A B A B KS0001Y01 TYPICAL AUDIO SPECIFICATIONS Typical specifications for the audio amplifier stage are as follows Input impedance 47k nominal Input sensitivity 100 mV typical Output 2 watts max 1kHz into 16 ohms TABLE OF OPTIONS i SPA 5 V S C gt 0 7 lt 12V O C 0V S C V S C gt 10 5V 12V O C 10 5V 12V O C Not Critical May be OV to 12V or O C 10 15 17 NOTES 0 C Open Circuit No connection S C Short Circuit lt 10 R to OV
10. AXIAL 15K METAL OXIDE RESISTOR 5 2W AXIAL 100R FUSIBLE METAL FILM RESISTOR 5 0 25W AXIAL 22K CARBON FILM RESISTOR 5 0 5W AXIAL 1K8 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARB MIN H MTG 20 0 1W 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 33R CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 PRESET POT CARB MIN H MTG 20 0 1W 15K METAL OXIDE RESISTOR 5 2W AXIAL 1K FUSIBLE METAL FILM RESISTOR 5 0 25W AXIAL 100R FUSIBLE METAL FILM RESISTOR 5 0 25W AXIAL 22K CARBON FILM RESISTOR 5 0 5W AXIAL 1K8 CARBON FILM RESISTOR 5 0 5W AXIAL 1K PRESET POT CARB MIN H MTG 20 0 1W 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 PRESET POT CARB MIN H MTG 20 0 1W 33R CARBON FILM RESISTOR 5 0 25W AXIAL 220R CARBON COMP RESISTOR 10 0 5W AXIAL 100K CARBON COMP RESISTOR 10 0 5W AXIAL COMP REF MODEL NO ONE R824 R835 R836 VR2R27 R838 R840 VR901 R901 R902 VR902 VR903 R904 R905 VR906 R907 R908 VR910 R911 R912 R913 VR914 R915 VR916 R917 R918 R920 VR921 R922 R923 R924 926 R927 R928 R931 VR932 R933 R933 R934 R934 R935 R936 R937 C1 C2 3 C4 C5 C6 C7 C8 C10 C10 C11 C11 C12 C13 14 C15 1496 LI2U 1486 LI2U PART NO RF273DJO RF475DJO RK825GKO RO022A0NI 2 RQ103AL1 RF103DJO RF223DJQO RF222DJO RQ102AL2 R0154LJO RF223DJO RQ473AL2 RL102GJO RF223DJO RQ103AL2 RF474JJO RG154LJO RF223DJO RQ473AL2 RF223DJO RQ103AL2 RF474JJO R0154LJO RF223DJO RQ473AL2 RL102GJO
11. BARREL X x SHAPED OR PIN CUSHION SHAPED PICTURE NOT CENTRAL ADJUST L PHASE E ADJUST CORRECTION FIELD SHIFT PICTURE NOT CENTRAL l ADJUST FIELD SHiFT TABLE OF PRESET ADJUSTMENTS CENTRAL FIELD SHIFT SET INPUT CONNECTIONS AND CUSTOMER CONTROLS 1 T T L Compatible Linear input Selection A compatible or linear 0 to 1500 ohm input level options can be selected by moving 3 links 1 TL103 R G B located on main PCB position 1 corresponds with linear levels position 2 with T T L levels NOTE Contrast control VR111 inoperative when position 1 is selected 2 Synchronisation Input Options A Syncinputs must be T T L compatible the timing of sync pulses should approximately correspond with those used for broadcast purposes refer to fig 1 for available options 3 Inverse Video A Tofacilitate inversion of T T L compatible video input signals by either moving link TL101 on main PCB to position 1 or removing TL101 and feeding a positive T T L level in to pin 9 of PL101 NOTE Monitors are normally despatched wired in composite negative going syncs mode with TL 102 not fitted and TL106 selected to position 1 KEY 1 12V 2 No connection 3 Sync 3 field sync 4 Red video E 900000000200 E 5 Sync 2 field sync 10 9 8 7 6 5 4 3 2 1 6 Green video 7 Sync 1 composite sync or line sync Signal input pin connections 8 B
12. Ground Circuit Reference RESISTORS R5 20 21 23 25 27 28 R6 8 R7 30 R9 R10 R11 12 R13 18 R14 15 R16 R17 R19 R22 24 26 R31 R32 R33 R40 R101 201 R102 202 R103 203 VR1 CAPACITORS C1 2 C3 C4 C5 C6 8 15 C7 16 17 18 19 20 27 C21 C22 C23 C24 C25 26 C30 C31 C101 102 201 202 C103 203 C104 204 C105 205 C106 206 C107 207 PARTS LIST Component Reference RF104DJO RF562DJO RF473DJO RF156DJO RF183DJO RF392DJO RF225DJO RF123DJO RF272DJO RF273DJO RF184DJO RF103DJO RL101DJO RF392DJO RF152DJO RF103DJO RF104DJO RF222DJO RF100DJO RQ102AL2 CA337EN6 CK331JJO CK121JKO CK681JJO CK104FLO CM225KK6 CM105NL6 CK222JKO CM105NL6 CK103JKO CK151JKO CM4758K6 CA107JL7 CA105NL6 CA2268M7 CA107JL7 CM225KL6 CA109HM6 CM105NL6 CA478FM7 Component Description RESISTOR C F 10K 1 4W 5 RESISTOR C F 560R 1 4W 5 RESISTOR C F 4K7 1 4W 5 RESISTOR C F 1M5 1 4W 5 RESISTOR C F 1K8 1 4W 5 RESISTOR C F 390R 1 4W 5 RESISTOR C F 220K 1 4W 5 RESISTOR C F 1K2 1 4W 5 RESISTOR C F 270R 1 4W 5 RESISTOR C F 2K7 1 4W 5 RESISTOR C F 18K 1 4W 5 RESISTOR C F 1K0 1 4W 5 RESISTOR M FUS 10R 1 4W 5 RESISTOR C F 390R 1 4W 5 RESISTOR C F 150R 1 4W 5 RESISTOR C F 1KO 1 4W 5 RESISTOR C F 10K 1 4W 5 RESISTOR C F 220R 1 4W 5 RESISTOR C F 1R0 1 4W 5 POT PRESET 100R 0 1W H7 CAPACITOR ALUM ELEC 33uF 16V CAPACITOR CERAMIC T 33pF 50V CAPACIT
13. KP0222D08 OR KP0300D08 5 2 PIN INLINE PLUG MTG SHROUDED LOCKABLE PRESSAC 320 3765 10 PIN INLINE PLUG PCB MTG SHROUDED PRESSAC 20 3450 5 2 WAY INLINE PLUG PCB MTG 20 3345 10 PIN INLINE PLUG PCB MTG UNSHROUDED PRESSAC 20 3430 10 PIN INLINE PLUG PCB MTG SHROUDED PRESSAG 20 3450 8 PIN INLINE PLUG PCB MTG UNSHROUDED PRESSAC 220 1138 8 PIN INLINE PLUG PCB MTG UNSHROUDED LOCKABLE PRESSAC 320 3768 COMP REF MODEL NO PART NO COMPONENT DESCRIPTION LK 1 5 7 8 10 18 20 22 WL2214TU1 WIRE LINK 5mm x 14mm x 5mm LK23 2031 AX 2032 AM 1451 AS 1451 DS WL2214TU1 WIRE LINK 5mm x 14mm x 5mm PL1 KP0220D06 PIN INLINE PLUG PCB MTG SHROUDED PRESSAC 20 1546 ee PL1 1496 L12U 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 2030 CS5 2031 CS5 2031 AX 2032 AM 1439 AS 1439 MS 1441 AL 1441 AS 1441 MS 1441 MS4 1486 LI2U 1451 AS 1451 MS 1451 DS 1451AP MS4 1451AP DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 L12 1241 AT KP0300D06 6 PIN INLINE PLUG PCB MTG SHROUDED LOCKABLE PRESSAC 320 3766 PL2 KP0025A03 PLUG 3 WAY 20 3443 PL3 KP0220D05 5 2 PIN INLINE PLUG MTG SHROUDED PRESSAC 220 2145 24 COMP REF MODEL NO PART NO COMPONENT DESCRIPTION L925 L926 L926 LW154UA5 1496 LI2U 1431AP MS4 1431AP DS
14. POLY CAPACITOR 20 RADIAL 680nF 50V ALUM ELECT CAPACITOR 20 AXIAL 4 7uF 35V ALUM ELECT CAPACITOR 20 50 RADIAL 10nF 630V MET POLY CAPACITOR 20 RADIAL 4700pF 30V POLYSTYRENE CAPACITOR 2 5 AXIAL 100nF 160V POLY CAPACITOR 20 RADIAL 220uF 25V ALUM ELECT CAPACITOR 20 50 RADIAL 47nF 250V MET POLY CAPACITOR 20 RADIAL 100nF 250V MET POLY CAPACITOR 20 RADIAL 10nF 2KV CERAMIC CAPACITOR 20 RADIAL 1 0 33uF 250V CAP 10 RADIAL 10uF 630V MET POLY CAPACITOR 20 RADIAL 470nF 400V MET POLY CAPACITOR 20 RADIAL 7500 1500V POLYPROPYLENE 5 RADIAL 5600pF 2000V POLYPROPYLENE CAP 5 RADIAL 3n3 2000V POLYPROPYLENE CAP 5 RADIAL 4700pF 2000V POLYPROPYLENE CAP 5 RADIAL 68nF 1 500V POLY CAPACITOR 20 RADIAL 1000uF 40V ALUM ELECT CAPACITOR 20 50 RADIAL 56pF 400V CERAMIC CAPACITOR 20 RADIAL 220nF 100V MET POLY CAPACITOR 20 RADIAL 100nF 250V POLY CAPACITOR 20 RADIAL 150nF 100V MET POLY CAPACITOR 20 RADIAL 100uF 35V ALUM ELECT CAPACITOR 20 50 RADIAL AS C302 220nF 100V MET POLY CAPACITOR 20 RADIAL 120pF 400V CERAMIC CAPACITOR 20 RADIAL 10uF 25V ALUM ELECT CAP 20 50 RADIAL 100nF 250V POLY CAPACITOR 20 RADIAL 470uF 35V ALUM ELECT CAP 20 50 RADIAL 220uF 25V ALUM ELECT CAP 20 50 RADIAL COMP REF MODEL PART NO COMPONENT DESCRIPTION NO C801 802 804 806 803 805 807 C808 C810 C811 CD104YL6 C901 C902 904 906 C903 905 907 C910 911 C913 D1 4 D5 D6 D7 0
15. TR11 and C9 use the sync pulses to clamp the B Y signal to the black level 2 21 merges B Y clamped signal to Y clamped signal to produce the BLUE output 3 TR22 is an electronic switch that has its threshold set by R56 and R57 4 gain of TR22 is set by R58 and R59 to produce TTL levels TR23 emitter follows the TTL signal which produces a buffered output The R Y Channel This channel is a phase alternating line PAL signal which requires alternate lines inverted to produce R Y 1 The incoming R Y signal is A C coupled by C17 C1 thus forming a unity gain phase splitter 2 non inverted output of TR1 drives an electronic switch The inverted output of TR1 is buffered by TR2 3 The R Y switch is enabled during the colour burst gating pulse 4 set re set flip flop switch formed by IC 1C and IC 1D works in the following a SET If next line of video is POSITIVE b RESET If next line of video is NEGATIVE 5 outputs of 1C1D enable bi directional switches which will either a Connect R Y through C1 b Connect inverted R Y through C2 Thus producing R Y TR4 and TR5 clamp the R Y to the black level 6 The R Y clamped signal is added to the Y clamped signal by TR13 to produce R signal 7 TR14 has its threshold set by R43 and R42 the gain is set by R44 and R45 in order to produce TTL levels 8 TR15 emitter follows t
16. resistors and diodes R G B drives are split in two ways 1 Test selectable links TL103 R G B 2 TolC101 Select Position 1 The input stage is in the linear mode the video is buffered and level shifted by emitter output stages These provide temperature tracking with TR103 104 and 105 resulting in a stable black level NOTE In the linear mode only brightness variations of the video information are possible using VR314 Select Position 2 TR103 104 and 105 bases are driven by IC101 This option is used when driving from TTL video sources offering primary secondary colour and black and white drives NOTE In the TTL mode signal to noise immunity of system is very good IC101 can be used with negative TTL level video drives R G B in order to invert video information Video inversion is achieved by toggling video polarity select line at PL101 pin 2 or TL101 Normal OV Invert 5V TTL Mode Contrast of video information is tracked by varying available potential across open collector load resistors R114 115 and 116 which are supplied by TR101 from 12V the base being driven from the contrast control slider VR111 R112 C101 form a low pass fitter and ensure smooth operation of contrast control CRT Beam Current Information is fed to D117 118 from a constant current source derived from 124V main HT rail As CRT beam current increases D117 118 junctions become more negative thus D117 conducts more heavily causing voltage
17. used to set video black level voltage TR907 performs line and field blanking of video information 1 TR907 is driven by negative going mixed blanking pulses from TR102 TR907 conducts providing a 7 5V black level reference During line and field flyback TR907 is turned off forcing video outputs off Beam current information is sensed on tube base panel resistively across line output ground to OV line by R937 D117 D118 on main PCB NO PICTURE LINE OSCILATING CHECK FOR 1 2 vOLTS AT JUNCTION OF R302 NO REPLACE IC 301 AND AND R206 SOAK TEST MONITOR IS VOLTAGE CORRECT YES CHECK FOR 8 9 VOLTS ON D907 IS VOLTAGE CORRECT REPLACE TR307 AND SOAK TEST MONITOR YES CHECK TR101 AND 106 ARE THESE COMPONENTS FAULTY CHECK FOR 12 VOLTS NO ON D117 IS D117 FAULTY YES YES REPLACE FAULTY REPLACE FAULTY COMPONENTS AND COMPONENTS AND SOAK TEST MONITOR SOAK TEST MONITOR BURST MODE REPLACE 018 020 AND TR1 THEN TURN TO MINIMUM SWITCH MONITOR ON IF STILL FAULTY REPLACE TRANSFORMER T2 REFER SWITCH MODE POWER SUPPLY SECTION AND RESET H T VOLTAGE SOAK TEST MONITOR YOLINOW 1531 5 0281 390v 1d3u SIA HOLINON 1531 AVOS ALINY SI HOLINOW 1531 XV05 X1IdOT3JONVHI ZOCUL ADIHI 191438 SJA SJA ANv31 LO SI 23H92 DN td 32 1438 N
18. 00305101 QS0500UMO M00205101 QS0392UMO QS0393WT1 COMPONENT DESCRIPTION NPN DARLINGTON TRANSISTOR TIPL 753A R3213 NPN TRANSISTOR TIPL753A R321 3 LCCD HEAT SINK SMPSU ASSEMBLY HEATSINK REDPOINT TV3 SPECIAL NPN SILICON POWER TRANSISTOR MOTOROLA BU500 NPN SILICON POWER TRANSISTOR TEXAS BU500 LCCD HEAT SINK LOPT ASSEMBLY NPN SILICON TRANSISTOR BC337 5 MOTOROLA NPN SILICON TRANSISTOR 2N4123 MOTOROLA PNP SILICON TRANSISTOR 2N4125 MOTOROLA NPN SILICON TRANSISTOR BC337 5 MOTOROLA NPN SILICON TRANSISTOR BF460 5 MOTOROLA HEATSINK REDPOINT TV3 SPECIAL NPN TRANSISTOR SIL BU500 HEATSINK REDPOINT TV3 SPECIAL AS TR106 NPN SILICON TRANSISTOR BF392 MOTOROLA TRANSISTOR BF393 W1 COMP REF MODEL PART NO COMPONENT DESCRIPTION NO TL201 TL201A B TL202 2 TL901 TL901 TL901 TL901A B TL901A B TR1 031 CS5 2032 AM 1431AP MS4 VAS 2 14 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1441 AL 1441 AS 1441 MS 1441 MS4 1486 LI2U 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 241 5 1446 LF 1446 LI2 1456 LI2 1241 AT KL4838Z02 2031 55 1431 5 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1436 LS1 1436 MS4 1441 MS4 1449 AS KM3070Y01 WL2210TU
19. 1 KM3070Y01 KL4838Z02 0006 01 1435 5 KM3070Y01 1435 MS KL4338Z02 QS0307UM5 LINK TEST 10 4838 PRESSAC PIN TEST 10 3070 PRESSAC WIRE LINK 5mm 10mm 5mm PIN TEST 10 3070 PRESSAC LINK TEST 10 4838 PRESSAC PIN TURRET 10 006 PRESSAC PIN TEST 10 3070 PRESSAC LINK TEST 10 4838 PRESSAC PNP SILICON TRANSISTOR BC307 5 MOTOROLA COMP REF MODEL PART NO COMPONENT DESCRIPTION NO TL102A B 201A B 2030 CS5 2031 AX 2032 AM 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 5 1441 AL 1441 AS 1441 MS 1441 MS4 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 LI2 1241 AT KM3070Y01 PIN TEST 10 3070 PRESSAC COMP REF MODEL NO PART NO COMPONENT DESCRIPTION TL101 103 1C6 TL102 2031 AX 2032 AM 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1441 AL 1441 AS 1441 MS 1441 MS4 1486 LI2U 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1241 AS 1446 LF 1446 LI2 1456 LI2 1241 AT Eee ee A ng VG ee ee ee ee GRE eee ee Ee ee Ee eee ee KS7859102 1486 LI2U 1435 MS 1446 LI2
20. 1 VR312 R313 314 R314 R314 R315 R316 R316 1441 AL 1496 L12U 1431 DS 1439 AS 1439 MS 2030 CS5 2031 CS5 203 VAX 2032 AM 1486 LI2U 1451 MS 1451 DS 1456 LI2 1241 AS 1241 AT 2030 CS5 2031 CS5 2031 AX 2032 AM 1241 AS 1441 AL 1241 AS RF825DJO RF123DJO RF363DJO RF105DJO RF225GJO RF104DJO RF913DJO RF324DJO RF224DJO RQ224AL1 RQ225AL1 RF225DJO RF155DJO RF222DJO RW333LJ5 RX223PJO RF100JJO R0100JJO RW682PJO RX1518J6 RO101LJO RF394GJO RL101GJO RF155JJO RW220PJO RF685DJO RF124DJO RF475DJO RF685DJO RQ475AL1 RQ105AL1 RF155DJO RF183DJO RF563DJO RQ105AL1 RF474DJO RF155DJO RF3340JO RF225DJO RF184DJO RF394DJO 820K CARBON FILM RESISTOR 5 0 25W AXIAL 1K2 CARBON FILM RESISTOR 5 0 25W AXIAL 3K5 CARBON FILM RESISTOR 5 0 25W AXIAL 100K CARBON FILM RESISTOR 5 0 25W AXIAL 220K CARBON FILM RESISTOR 5 0 5W AXIAL 10K CARBON FILM RESISTOR 5 0 25W AXIAL 9K1 CARBON FILM RESISTOR 5 0 25W AXIAL 82K CARBON FILM RESISTOR 5 0 25W AXIAL 22K CARBON FILM RESISTOR 5 0 25W AXIAL 22K PRESET POT CARBON MIN 20 0 1W V MTG 220K PRESET POT CARBON MIN 20 0 1W V MTG 220K CARBON FILM RESISTOR 5 0 25W AXIAL 150K CARBON FILM RESISTOR 5 0 25W AXIAL 220R CARBON FILM RESISTOR 5 0 25W AXIAL 3K3 WW RESISTOR 5 2W PLUG 2K2 FUSIBLE WW RESISTOR 5 2W RADIAL 1RO CARBON FILM RESISTOR 5 1W AXIAL 1RO METAL OXIDE RESISTOR 5 1W AXIAL 680R W
21. 1 14 20 21 22 23 24 25 26 RF222DJO RF472DJO RESISTOR C F 220R 0 25W 5 RESISTOR C F 4708 R4 7 10 12 0 25W 5 R15 18 RF103DJO RESISTOR C F 470R 0 25W 5 R5 8 13 RF103DJO RESISTOR C F 1K0 0 25W 5 R16 RF683DJO RESISTOR 1 0 0 25W 5 R9 17 RF102DJO RESISTOR C F 100R 0 25W 5 R19 RESISTOR C F 2K2 0 25W 5 NOTE FOR APPLE MONITORS ONLY RESISTOR C F R9 R17 BECOMES 220R 0 25W 5 CAPACITORS C1 CA2268M6 CAPACITOR ALUM ELEC 2 2UF 63V C2 3 CM105ML6 CAPACITOR MET P 0 1 UF 160V C4 5 6 CK151JKO CAPACITOR CER T 15PF 50V DIODES TRANSISTORS INTEGRATED CIRCUITS TR1 QS0337UTO TRANSISTOR BC337 5 IC1 IV7805LXO CIRCUIT INT 78L05 IC2 IR18030AX2 PROM TBP 18SA030N PROGRAMMED INDIVIDUALLY FOR SPECIFIC MODEL D1 2 5 DS4148UTO DIODE IN4148 THOMPSON CONNECTORS PL1 3 KP0026A10 PLUG 10 PIN 20 3450 PRES PL2 KP0025A05 PLUG 5 WAY 20 3445 INDUCTORS L1 2 3 LW104SK2 CHOKE 10 UH Sync Signals 1 Sync signals are not required by the PROM circuitry and are passed directly through the interface panel R F I Filtering 1 models requiring filtering L C networks formed by L1 C4 L2 C5 and L3 C6 are fitted on R G 8 B outputs AMENDMENTS AFFECTS All metal cabinet monitors DESCRIPTION Modifications to bring cabinet back vvire routing dressing and securing in line with current production practice IMPLEMENTATION These modifications only apply whenever a monitor is returned for service MODIFICATIONS With the cabinet top
22. 1 CABINET BACK ASSEMBLY M00141103 INPUT AND CONTROLS BRACKET ASSEMBLY METAL UN SCREWS TYPICAL AT SEVERAL LOCATIONS D SERIES CABINET 14 INCH MODEL This cabin is injection moulded and is one of the latest designs offered in the MICROVITEC CUB monitor range and is available in different colours D SERIES CABINET COMPONENT PARTS IDENT NO PART NO DESCRIPTION PC0124101 FACIA CABINET BEZEL 0125101 0126101 HINGED DOOR M00221104 INPUT BRACKET ASSEMBLY METAL 7 SCREWS TYPICAL AT SEVERAL LOCATIONS C SERIES CABINET 20 INCH MODEL This cabinet is an all metal rugged construction incorporating carrying handles fitted on each side C SERIES CABINET COMPONENT PARTS IDENT NO PART NO DESCRIPTION 0136103 FACIA BEZEL MC0137104 CABINET TOP SIDE ASSEMBLY MC0150103 CABINET TOP SIDE ASSEMBLY INCL SPEAKER M00235102 CABINET BASE ASSEMBLY 0139101 BACK ASSEMBLY 0140101 BLISTER FITTED BACK COMP REF TR802 805 807 902 904 906 TR802 805 807 902 904 906 TR802 805 TR803 907 TR806 TR807 TR902 904 906 TRIPLER TY1 2 PCB MODEL NO PART COMPONENT DESCRIPTION NO 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1436 LS1 1436 MS4 1486 LI2U 1435 MS 1439 AS 1441 AL 1441 AS 1441 MS 1441 MS4 1449
23. 5 1439 MS 1451 AS 1451 MS4 1451AP MS4 1451AP DS 1451 DS 1451 MQ3 1456 LI2 2030 CS5 2031 CS5 2031 AX 2032 AM LW154SK2 CHOCK WIRE ENDED 15uH B78108 T1153 K 15uH IN SERIES WITH R924 CHOKE 15uH B78108 T1153 K COMP MODEL NO PART NO COMPONENT DESCRIPTION REF L2 L201 L202 L203 L204 L801 804 L801 L802 L803 804 L901 1496 LI2U 2030 CS5 2031 CS5 2031 AX 2032 AM 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 AS 1439 MS 1441 AL 1441 AS 1441 MS 1441 MS4 1486 LI2U 1451 AS 1451 DS 1451 MS 1451AP MS4 1451AP DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 LI2 1241 AT 1441 AL 1441 AS 1441 MS 1442 1446 LF 1446 LI2 1241 AT LW104UA7 LW154SK2 LV001UA5 LNOO2UA5 LW104UA7 LW154SK2 LW154VA5 LW104VA4 LW104VA4 LW154UA5 CHOKE WIRE ENDED 10uH PC5640 CHOKE WIRE ENDED 15uH B78108 T1153 K COIL WIDTH PC3398 COIL LINE LINEARITY PC5580 CHOKE WIRE ENDED 10uH PC5640 CHOKE 15uH B78108 T1153 K CHOKE WIRE ENDED 15uH PC3391 CHOKE WIRE ENDED 10uH PC2677 CHOKE WIRE ENDED 10uH PC2677 CHOKE WIRE ENDED 15uH PC3391 COMP REF MODEL PART NO COMPONENT DESCRIPTION NO FH3A B HARNESS HARNESS HARNESS HARNESS HARNESS HARNESS IC1 IC1 HEATSINK IC101 IC102 IC201 IC301 IC301 H
24. 8 10 14 D11 13 D15 16 D17 D18 D20 D21 D22 D23 D24 D25 116 D101 107 D108 110 111 D108 110 111 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 MS4 1431 BS 1431 LS1 1431 MB4 1431 MZ3 1431 MZ4 1431 MR4 1435 MS 1436 LS1 1436 MS4 2030 CS5 1439 AS 1439 MS4 1439 MS 1451AP DS 1449 AS D117 D118 D201 D301 D302 D801 803 D804 CM105NL6 CP271GGO CP561GG0 CD104YL6 CM105NL6 100nF 250V METAL POLYESTER CAPACITOR 20 RADIAL 27pF 30V POLYSTYRENE CAPACITOR 2 5 AXIAL 56pF 30V POLYSTYRENE CAPACITOR 2 596 AXIAL 10nF 2KV CERAMIC CAPACITOR 2096 RADIAL 100nF 250V METAL POLYESTER CAPACITOR 20 RADIAL 10nF 1 2KV CERAMIC CAPACITOR 20 RADIAL CM105NL6 CP271GGO CP122GG1 CD104YLS CM105NL6 DP4007UMO OP4005UMO DF0157UEO DF0159UEO DS4148UTO DS4148UTO DP4002UMO DF0159UEO DZ3875CFCO D279331FCO DP4002UMO DF0159UEO DF0818UMO DF0157UEO DP4002UMO DS4148UTO DZ79560FCO DZ79430FCO DZ79121FCO DF0157UEO DS4148UTO DP4005UMO DS4148UTO DZ79750FC1 100nF 250V METAL POLYESTER CAPACITOR 20 RADIAL 27pF POLYSTYRENE CAPACITOR 2 5 AXIAL 120pF POLYSTYRENE CAPACITOR 2 5 AXIAL 10nF 2KV CERAMIC CAPACITOR 2096 RADIAL 0 1uF 250V METAL POLYESTER CAPACITOR 2096 POWER RECTIFIER DIODE IN4007 MOTOROLA AXIAL POWER RECTIFIER DIODE IN4005 MOTOROLA AXIAL FAST RECOVERY DIODE BA157 MOTOROLA AXIAL FAST RECOVERY DIODE BA159 MOTOROLA AXIAL SMALL SIGNAL DIODE IN4148 THOMPSO
25. AS 1241 AS 1446 LF 1446 LI2 1241 AT 1441 1442 1241 AS 1431AP MS4 1431AP DS 1496 LI2U 1451 AS 1451 DS 1451 MS4 1451AP MS4 1451 MQ3 1451AP DS 1456 LI2 2031 CS5 2031 AX 2032 AM QS0787UM1 QS0869UAO QS0869UAO QS4123UMO QS0393WT1 QS0869UAO QS0869UAO ET001QA1 QY0103UMO BC0029106 NPN SILICON TRANSISTOR BF787 5 MOTOROLA NPN SILICON TRANSISTOR BF869 5 MOTOROLA TRANSISTOR BF869 NPN SILICON TRANSISTOR 2N4123 MOTOROLA TRANSISTOR BF393 W1 TRANSISTOR BF869 NPN SILICON TRANSISTOR BF869 5 MOTOROLA TRIPLER BG1897 THYRISTOR BR 103 MOTOROLA AXIAL MAIN PCB ASSEMBLY SERIES 3 6 COMP REF MODEL NO PART NO TR2 1496 LI2U 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 5 1441 AL 1441 AS 1441 MS 1441 MS4 1451 AS 1451 DS 1451 MS4 1451AP MS4 1451 MQ3 1451AP DS 1456 LI2 2032 AM 1486 LI2U 1449 AS 1241 AS 1446 LF 1446 LI2 1241 AT HEATSINK TR2 HEATSINK TR16 TR16 HEAT SINK TR101 TR102 TR103 105 TR106 TR201 TR201 HEATSINK TR202 TR202 HEATSINK TR301 TR801 804 806 901 903 905 TR801 804 1441 1442 1449 AS 02 QP0753UX0 A00007102 M00205101 QS0500UMO OR QS0500VXO A00008102 QS0337UTO QS4123UMO QS4125UM5 QS0337UTO QS0460UMO M
26. AT A RER 1241 AS 1241 AT 104 CL223XJ6 CA106JLO CY103NL6 CM1C5RL6 CD223FL6 CA476HM6 CM105NL6 CD472RL6 CA477NM6 CD472RL6 CA478FM6 CM105ML6 CA228FM6 CA107FM6 CM105ML6 CM225KL6 CD102FL6 CM475KL6 CM225KL6 CM105ML6 CA685JLO CA476HM6 CM104TL6 CP473GGO CM105ML6 CA228FM6 CM474NK6 CM105NL6 CD104YL6 CL335KN6 CM104TL6 CM475RL6 CL753XJ6 ALL 1441 1442 MODELS CL563YJ6 CL333XJ6 CL473YJ6 CM684XK6 CA109IN7 CD561RL6 CM225KL6 CM105NK6 CM155KK6 CA108HM6 CM225KL6 CD122RL6 CA107FM6 CM105NK6 CA478HM6 CA228FM6 10nF 160V POLYSTYRENE CAPACITOR 2 5 AXIAL 2200pF 2000V POLYPROPYLENE CAPACITOR 5 RADIAL 50V ALUM ELECT CAPACITOR 20 AXIAL 1000pF 250V AC CERAMIC DISC CAPACITOR CLASS Y 20 RADIAL 100nF 400V POLY CAPACITOR 20 RADIAL 2200pF 25V CERAMIC CAPACITOR 20 RADIAL 4 7uF 35V ALUM ELECT CAPACITOR 20 50 RADIAL 100nF 250V MET POLY CAPACITOR 20 RADIAL 470pF 400V CERAMIC CAPACITOR 20 RADIAL 47uF 250V ALUM ELECT CAPACITOR 20 50 RADIAL 470pF 400V CERAMIC CAPACITOR 20 RADIAL 470uF 25V ALUM ELECT CAPACITOR 20 50 RADIAL 100nF 160V POLY CAPACITOR 20 RADIAL 220uF 25V ALUM ELECT CAPACITOR 20 50 RADIAL 10uF ALUM ELECT CAPACITOR 2 50 RADIAL 100nF 160V POLY CAPACITOR 20 RADIAL AS C101 220nF 100V MET POLY CAPACITOR 20 RADIAL 100pF 25V CERAMIC CAPACITOR 20 RADIAL 470nF 100V MET POLY CAPACITOR 20 RADIAL 220nF 100V MET POLY CAPACITOR 20 RADIAL 100nF 160V MET
27. AY 20 3456 PLUG 5 WAY 20 3445 PLUG 3 WAY 20 3443 PLUG 4 WAY 20 3444 PLUG 3 WAY 20 3423 LINK TEST MOLEX 90059 0009 0 CRYSTAL IQD TYPE P A124D PCB PAL INTERFACE WIRE LINK 5mm x 14mm x 5mm WIRE LINK 5mm x 12mm x 5mm WIRE LINK 5mm x 14mm x 5mm WIRE LINK 5mm x 12mm x 5mm I FACE ASSEMBLY TPL STD MC REV 1 SPECTRUM INTERFACE CARD DESCRIPTION OPERATION LUMINANCE CHANNEL Y A The Y signal contains 1 Video information 2 line sync pulses 3 frame sync pulse The incoming Y signal is attenuated by the potential divider R16 R17 the resultant signal is then amplified by TR6 Transistors TR7 TR8 and TR9 have the following functions 1 Separates the sync pulses 2 8 Inverts the sync pulses 3 TRO Buffers the sync pulses R28 and R29 in the emitter of TRY splits the voltage swing to produce a SYNC output The rising edge of the sync output signal is used by C6 R3Q and TR24 to produce a pulse which has the same duration and timing as the colour burst gating pulse on the R Y signal The luminance signal on the collector of TR6 is clamped to the black level by C10 and TR25 The black level is set by resistor diode potential divider formed by VR1 R36 R37 R65 and 2 IN4148 diodes COLOUR DIFFERENCE CHANNELS A The B Y Channel 1 B Y signal is attenuated by a potential divider network R32 and R34 TR10 inverts and amplifies to produce B Y
28. E or by the safety earth symbol or coloured GREEN or GREEN and YELLOW 2 Neutral The wire coloured BLUE must be connected to the terminal marked N or coloured BLACK 3 Live The wire coloured BROWN must be connected to the terminal marked L or coloured RED X Ray Radiation X rays constitute a health hazard on prolonged exposure at dose range unless adequate shielding is provided Precautions must be exercised during servicing of display equipment to ensure that the anode voltage and other tube voltages are adjusted to the recommended values Replace with a tube of the same type number or recommended replacement to assure continued safety Implosion Protection This tube employs integral implosion protection and must be replaced with a tube of the same type or a recommended replacement to assure continued safety Shock Hazard The high voltage at which the tube is operated may be very dangerous Extreme care should be taken in the servicing or adjustment of any high voltage circuit Caution must be exercised during the replacement or servicing of the tube since a residual electrical charge may be contained on the high voltage capacitor formed by the external and internal conductive coating of the tube funnel To remove any undesirable residual high voltage charges from the tube bleed off the charge by shorting the anode contact button located in the funnel of the tube to the external conductive coating before handling the tube Tub
29. EATSINK L2 2031 CS5 2031 AX 2032 AM 1431AP MS4 1431AP DS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 5 1441 MS 1441 MS4 1451 AS 1451AP MS4 1451AP DS 1451 DS 1449 AS 1456 LI2 1241 AS 1446 LF 1446 LI2 1241 AT KS0001Y01 A00584101 A00585101 2031 CS5 1449 AS 2031 CS5 1441 AL 1441 AL 00815101 00816101 00104101 A00179101 IV7812MX3 HHO003HAO IT74136MM2 IV7805LXO IL1180PS2 IL1170SS2 HHC001HCO LW473UA6 FUSE CLIP PCB MTG 5mm TB NO 1 4 LEADS BR OR W Y TB NO 2 8 LEADS TB NO 1 4 LEADS BR OR W Y TB NO 2 8 LEADS TB NO 1 4 LEADS TB NO 2 8 LEADS VOLTAGE REGULATOR 1C 78M12 HEATSINK 1 STAVER TYPE V6 2L OR TTL LOGIC SN74LS136N VOLTAGE REGULATOR IC 1 78L05 LINEAR BI POLAR IC TDA 1180P PLASTIC DIL S G S LINEAR BI POLAR IC TDA 11708 PLASTIC DIL S G S HEATSINK STAVER V8 800 CHOKE WIRE ENDED 10uH PC3774 COMP REF MODEL NO PART NO COMPONENT DESCRIPTION FH1A B FH2A B 2030 CS5 2031 CS5 2031 AX 2032 AM 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1435 MS 1436 LS1 1436 MS4 1439 5 1439 MS 1441 AL 1441 AS 1441 MS 1441 MS4
30. EGAUSING BANDWIDTH RESOLUTION DOT PITCH CRT INPUTS MODEL 1431 MODEL 1432 INPUT CONNECTOR OPERATING TEMP POWER CONSUMPTION TECHNICAL SPECIFICATIONS 1 625 lines 50 fields interlaced or 31 2 313 lines 50 fields non interlaced 2 525 lines 60 fields interlaced or 262 263 lines 60 fields non interlaced other non standard systems may be suitable consult MICROVITEC PLC Nominal 180 265V 40 to 64Hz Pull in range 15 to 16KHz 50Hz Pull in range 45 to 65Hz Or 3 0 6mm screen center 1 6mm screen edge 24KV approximately or 1KV 15 625KHz Automatic at switch ON 18MHz 452 H x585 V elements 0 64mm Rectangular 335 4mm screen diagonal 90 deg deflection Precision in line gun vertical stripe screen high voltage focus TTL compatible 1500 ohm R G B inputs link selectable positive or negative video Linear 0 to 4V 1500 ohm R G B inputs Positive video composite or separate line and field synchronisation each link selectable positive or negative 10 pin in line SYSTEM 25 Pressac 0 to 55 deg C max open chassis 10 deg C to 40 deg C max 65 Watts approximately MODELS 1441 AND 1442 14 HIGH RESOLUTION NOTE As models 1431 and 1432 with the following exceptions CONVERGENCE ERROR MAX EHT BANDWIDTH RESOLUTION DOT PITCH POSITIONAL ERROR CONVERGENCE ERROR MODEL 1451 0 3mm screen center 0 8mm screen edge Approximately 24KV 18MHz 895 H x585 V elements rectang
31. I NILS ITLSIHM SI Gv31 LH Ud OA JAOW3UH HOLINOW 1531 AYOS H31dIHL 39W1d38 ON 6329N3GI 3 NI JTLSIHM SI 9 1102 MV JAOWAY 311SIHM INN NY YOLINOW 1531 AVOS 40 3SNVI HSIT VLS3I Oi S423HO UJHLHN1 S3Hi103H BOLINOW SJA SIA LALINVI HOLINOW 11538402 JOVLIOA SI 1931 NYOS ZNA ae JUV LOZ1L NO 01 JJVIdJH S130A 323H2 LOZO SETH 3SdVT1O2 3INVUJ 3 _ _ _ _ ___ _ ___ _ _ HOLINOW HOLINOW 1531 XV05 1531 MYOS 102721 30v1d34 Y3IGTOS LOC DI SI 1 V SVM LOT OI XOJHIJ H04 0122 AOSHI INAS LNILLIWYILNI 1 INV4 JO 3 5 153 OL SX03H9 HIHLYNAS SJHINDIYU YOLINOW HOLINOW 1531 5 SLNJNOGWOJ ALINGA 30V1d3H SJA HOLINOIN 1531 VOS ANV HOLINOW 1531 5 ALINVA SIN3NOdWOO S4N3NOdWOO LAL YO ONV OLY JUV ALIMV4 39vid3H 39v 1438 LAL 91H 993HO9 SIA SIA ON ALINVH HO QGNY 3509 3 SI ZALINV4 812 SI 812 323H2 O EZO 220 X 9L A93H9 Q3AVNIWOTII HOLINOW SIA EGAddIUL LEZU SVH LECH 151539 3181503 493H2 HOLINOW 1531 AVOS SLNANOdWOJ 30v 1d3H HOLINOW 1531 AVOS
32. If the answer is NO as in this case you must move onto the next box and carry out the next check If the answer is YES the next box will be refer to Fig 2 SOLDER DRY JOINT AND SOAK TEST MONITOR Fig 2 Further into the Fault Isolation Procedure you may be asked to check a component for example refer to Fig 3 CHECK TRIPLER MODULE IS TRIPLER MODULE FAULTY Fig 3 In this case the best method of checking the Tripler Module would be substitution for a serviceable Tripler Module This would establish very quickly the condition of the Tripler Module in relation to the fault When all the known fault causes have been effected the chart wil be terminated by a box reading refer to Fig 4 MONITOR REQUIRES FURTHER CHECKS TO ESTABLISH CAUSE OF FAULT Fig 4 If you have reached this stage you should use the circuit diagram and items of test equipment and adopt a logical method of fault isolation and repair Illustrated Parts Listing I P L This section contains ail current cabinet designs in the Microvitec monitor range It is intended to show the service technician how to gain access to the equipment for repair purposes In addition component part numbers accompany each illustration this will assist you when ordering a component part 1 MODELS 1431 1432 SYSTEM SUPPLY TIMEBASE LINE FRAME FREQUENCY POSITIONAL ERROR CONVERGENGE ERROR EHT EHT REGULATION LINE FREQUENCY D
33. K CARSON FILM RESISTOR 5 0 25W AXIAL 47K CARBON FILM RESISTOR 5 0 25W AXIAL PLUG 5 WAY 20 3445 10K PRESET POT CARB MIN 20 0 15W V MTG PLUG 8 WAY PRESSAC 25 20 3448 BDFH 1K CARBON FILM RESISTOR 5 0 25W AXIAL 470R CARBON FILM RESISTOR 5 0 25W AXIAL 53CR CARBON FILM RESISTOR 5 0 25W AXIAL 220R CARBON FILM RESISTOR 5 0 25W AXIAL 1K5 CARBON FILM RESISTOR 5 0 25W AXIAL 470R CARBON FILM RESISTOR 5 0 25W AXIAL 1K5 CARBON FILM RESISTOR 5 0 25W AXIAL IK CARBON FILM RESISTOR 5 0 25W AXIAL 220R CARBON FILM RESISTOR 5 0 25W AXIAL 220R CARBON FILM RESISTOR 5 0 25W AXIAL 100R CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARBON MIN 20 0 1W H MTG 1K CARBON FILM RESISTOR 5 0 25W AXIAL 180K CARBON FILM RESISTOR 5 0 25W AXIAL 100K CARBON FILM RESISTOR 5 0 25W AXIAL 180K CARBON FILM RESISTOR 5 0 25W AXIAL 47K CARBON FILM RESISTOR 5 0 25W AXIAL 2K7 CARBON FILM RESISTOR 5 0 25W AXIAL 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 6M8 CARBON FILM RESISTOR 5 0 25W AXIAL 1M5 CARBON FILM RESISTOR 5 0 25W AXIAL 2M2 CARBON FILM RESISTOR 5 0 25W AXIAL 39K CARBON FILM RESISTOR 5 0 25W AXIAL 1K CARBON FILM RESISTOR 5 0 25W AXIAL 10R CARBON FILM RESISTOR 5 0 25W AXIAL COMP REF MODEL NO PART NO COMPONENT DESCRIPTION R210 R211 R212 R213 R214 R215 R215 R216 R217 VR218 VR220 R221 R222 R223 224 R225 R226 R227 R227 R228 230 R231 R232 R233 234 R235 R236 R237 R301 R302 R303 304 R305 VR306 VR307 R308 R310 R31
34. LECH 301053M 4LSIX3 THIS YOLINOW 1531 AVOS 3HL 309 L cH 03339910534 ONIAVH HOLINOW 1531 5 NIHL ISNA 3411933430 GNV 1102 ONISAVO3O 32v1d38 SJA MOD ONISNVOA SI 102 ONISNAVOIO HIHI ON YOLINOW 1531 NYOS 3503 394193339 7112 32 1438 5 ALINV3 LLO SI LLO ON HOLINOW 1531 AVOS NIHL 3804 3A1193430 49134933 390188 30V1d3H S3A ALINYJ H3I11L034 390 49 SI 431311938 390148 323H2 ELINDYUID NIdO 53503 5 JO 35054 SNIVW 23 13 X03H9 O3JLYNIWNTTI LON HOLINON COMP REF MODEL NO PART NO 1 2 VR4 R5 R5 R8 R10 R11 R12 R12 R13 R14 R15 R16 R16 R16 R16 R17 R18 20 R21 R22 R23 R23 R24 R25 R26 R27 R29 R29 R30 PARTS LISTING SERIES 3 SERVICE MANUAL 1441 AL 1441 AS 1441 MS 1441 MS4 1449 AS 1496 LI2U 1486 L12U 1241 AS 1446 L12 1451 MQ3 1446 LF 1441 AL 1441 AS 1441 MS 1441 MS4 1449 AS 1486 LI2U A AA JR EN 1496 L12U 1486 LI2U 1451 AS 1451AP DS 1451 DS 1496 LI2U 1486 L12U 1451 AS 1451AP DS 1431 DS 1451 DS 1441 AL 1486 LI2U RK105GKO RF185JJO RF393DJO RF273DJO RF363DJO RF473DJO RF333DJO RQ103AL2 RF104DJO RF683DJO RF323DJO RW154XJ 6 RF471DJO RF333JJO RF224GJO RF564GJO
35. LLECTOR with 100 to 1 scope probe 5 Vertical Sync Output A B Output of field sync separator is used to drive vertical sync output stage on pin 10 IC201 In addition this pulse is used internally to inhibit the first phase detector during the field sync period thus preventing flutter as a result of equalising pulses 6 Sandcastle Pulse A Sandcastle pulse is on pin 7 IC201 used on models with linear interface PCB assembly consisting of two sections 1 Upper portion suitable for burst gate and clamping operations from the horizontal oscillator thus ensuring an accurate phase relationship with the video information 2 Lower portion derived from a line flyback slice for line blanking LINE OUTPUT DESCRIPTION AND OPERATION A Line Output 1 1202 L203 and T202 primary are tuned during the flyback period by C222 This lasts for 11 8 11 105 on 14 20 monitors 2 Line output transistor TR2C2 is driven directly from the secondary winding of T201 ON current is controlled by R227 turn off dissipation is minimised by L204 3 Line linearity correction is provided by L203 which is damped by C217 R230 S correction is provided by C218 4 Field timebase 25V IC301 is achieved by rectifying a negative going flyback voltage from a secondary winding on line output transformer A fusable resistor provides CRT protection under possible fault conditions LINE SYNC with 10 to 1 scope probe
36. MICROVITEC SERVICE MANUAL SERIES 3 COLOUR DISPLAY MONITORS GP0019AA2 MICROVITEC SERVICE MANUAL INTRODUCTION The contents of this manual are divided into several sections We will now look in some detail at the sections and explain how they are to be used to their best advantage Factory Pre set Adjustments Some of these adjustments are very critical not only from an operational point but also from a safety point The manufacturer recommends that you read and understand the section fully before making any adjustments All pre set adjustments are included in this section You are given the prefix for example Field Linearity VR312 If you are not sure of the location of any pre set or component then you should refer to the section containing PCB or CRT base panel layouts Once you have located the pre set you are then told what effect the adjustment will have on the display Removal Installation Mechanical Detail This section gives information text and illustrated on how to remove major service items such as CRT Main PCB and Tripler etc Description and Operation These sections will help you to understand the design concept of the Microvitec CUB Monitor They give very detailed descriptions of each part of the circuit For example Line Timebase Field Timebase etc It is very important that you read these sections before attempting any of the fault isolation and repair procedures Specification The first s
37. N AXIAL SMALL SIGNAL DIODE IN4148 THOMPSON AXIAL POWER RECTIFIER DIODE 1N4002 MOTOROLA AXIAL FAST RECOVERY DIODE BA159 MOTOROLA AXIAL ZENER DIODE BZY88C7V5 400mW 5 AXIAL ZENER DIODE BZX79C33V 400mW 5 AXIAL POWER RECTIFIER DIODE IN4002 MOTOROLA AXIAL FAST RECOVERY DIODE BA159 MOTOROLA AXIAL FAST RECOVERY DIODE MR818 MOTOROLA AXIAL FAST RECOVERY DIODE BA157 MOTOROLA AXIAL POWER RECTIFIER DIODE IN4002 MOTOROLA AXIAL SMALL SIGNAL DIODE IN4148 THOMPSON AXIAL ZENER DIODE BZX79C5V6 400mW 5 AXIAL ZENER DIODE BZX79C4V3 400mW 5 AXIAL ZENER DIODE BZX79C12V 400mW 5 AXIAL AS D108 FAST RECOVERY DIODE BA157 MOTOROLA AXIAL SMALL SIGNAL DIODE 1N4148 THOMPSON AXIAL POWER RECTIFIER DIODE IN4005 MOTOROLA AXIAL SMALL SIGNAL DIODE IN4148 THOMPSON AXIAL ZENER DIODE BZX79C75 400mW 595 AXIAL COMP MODEL NO PART COMPONENT DESCRIPTION REF NO D804 D805 808 D901 906 D907 D907 D908 F1 F2 1441 AL 1441 AS 1441 MS 1442 1449 AS 1241 AS 1446 LF 1446 LI2 1241 AT DZS8750FCO DS4148UTO DS4148UTO DZ79750FC1 1496 LI2U 1439 5 1439 MS 1431AP MS4 1431AP DS 1431 AS 1432 AS 1431 BS 1431 LS1 1431 MZ3 1431 MZ4 1431 MB4 1431 MR4 1431 MS4 1431 DS 1436 LS1 1436 MS4 2030 CS5 2031 CS5 2031 AX 2032 AM 1456 LI2 1451AP MS4 1451AP DS 1451 DS 1451 MS4 1451 MQ3 1451 AS DZ88750FCO KA2001BAO DIODE BZY88C7V5 SMALL SIGNAL DIODE 1N4148 THOMPS
38. ON AXIAL SMALL SIGNAL DIODE IN4148 THOMPSON AXIAL ZENER DIODE BZX79C7V5 400mW 5 AXIAL ZENER DIODE BZY88C7V5 400mW 5 AXIAL AS D805 FUSE 2AMP 20mm TIME DELAY TRIPLE STANDARD PAL INTERFACE GENERAL The Triple Standard PAL Interface Assembly is designed to interface between the Series 3 main chassis PCB assembly and the host system It is designed to accept RS170 video signals 0 7v p p video 0 3v p p mixed Ve Sync into 75R In wire frame chassis format output connections from interface to main chassis PCB are made via hard wired flexible leads and rnultiway plug in connectors PL102 and PL103 located on the mam chassis On some models an interface input wiring harness lead assembly is provided This is supplied with one end only of the harness terminated in a 17 way connector the opposite wire ends being unterminated Circuit details and connections for this harness lead assembly are given in the accompanying diagram 1 7 Wav Harness Connections and Table of Options DOUBLE STANDARD TRIPLE STANDARD INPUTS Depending on how the interface assembly is installed input modes for either double or triple standards may be accommodated as follows 1 TTL and PAL Video Mode Double Standard 2 TTL 1 volt 75 ohm and PAL Video Mode Triple Standard 1 Double Standard Input When wired as indicated in the diagram TTL and PAL Video Modes are accommodated Either one of these two modes be selected by a single po
39. OR CERAMIC T 12pF 50V CAPACITOR CERAMIC T 68pF 50V CAPACITOR CERAMIC T 10nF 25V 2096 CAPACITOR MET T 0 22uF 100V CAPACITOR MET T 0 1uF 250V CAPACITOR CERAMIC T 220pF 50V CAPACITOR MET P 0 1uF 250V CAPACITOR CERAMIC T 1nF 50V CAPACITOR CER T 15pF 50V AXIAL CAPACITOR MET P 470nF 63V CAPACITOR A ELEC 10uF 50V 20 RAD PR CAPACITOR CERAMIC T 100nF CAPACITOR A ELEC 2 2uF 63V PREF CAPACITOR A ELEC 10uF 50V 20 RAD PR CAPACITOR MET P 0 22uF 100V CAPACITOR ALUM ELEC 1000uF 35V CAPACITOR MET P 0 1uF 250V CAPACITOR ALUM ELEC 470uF 25V Circuit Reference DIODES D1 2 04 5 INTEGRATED CIRCUITS IC1 IC2 IC101 IC201 CHOKES 8 DELAY LINES L1 L2 L3 L4 5 L11 DL1 DL2 CONNECTORS PL1 PL2 PL102 PL103 PL104 TL1 MISCELLANEOUS FIT TL1 X1 2 TRACK CUTS LK1 2 3 LK6 7 8 LK9 10 LK12 13 Component Reference Component Description DZ73560FRO DS4143UTO IL3301UM3 IG4551UM2 IL19080S2 LW474SK2 LW105SK2 LW104SK2 LV001TA3 LW154SK2 ED0001P01 ED0002P01 KP0026A17 KP0026A16 KP0025A05 KP0025A03 KP0025A04 KP0024A03 KL9005Z02 XC0014UU6 0111102 WL2214TU1 WL2212TU1 WL2214TU1 WL2212TU1 A01647101 DIODE ZENER BZX79B5V6 2 DIODE 1N 4148 THOMSON CIRCUIT INT TDA3301 SELECTED CIRCUIT INT 4551 CIRCUIT INT TDA 1908 CHOKE 47uH CHOKE 100uH CHOKE 10uH CHOKE KAN K2819XM 15uH 78108 1153 DELAY LINE DL470 DELAY LINE DL711 PLUG 17 WAY 20 3457 PLUG 16 W
40. R CARBON COMP RESISTOR 1096 0 5W AXIAL 100K CARBON COMP RESISTOR 10 0 5W AXIAL 470K CARBON FILM RESISTOR 5 0 25W AXIAL 820K CARBON COMP RESISTOR 10 0 5W AXIAL 2M2 PRESET POT CARBON H MTG 20 0 15W 150K CARBON FILM RESISTOR 5 1W AXIAL 180K CARBON FILM RESISTOR 5 1W AXIAL 180K CARBON FILM RESISTOR 5 1W AXIAL 220K CARBON FILM RESISTOR 5 1W AXIAL 47K CARBON FILM RESISTOR 5 1W AXIAL 100R FUSIBLE METAL RESISTOR 5 0 5W AXIAL 2K7 CARBON FILM RESISTOR 5 0 25W AXIAL 1220nF 250V MET POLY CLASS X CAP 20 RADIAL I 1000pF 250V AC CERAMIC DISC CAPACITOR CLASS Y 20 RADIAL AS C1 470pF 2KV CERAMIC CAPACITOR 20 RADIAL 10nF 630V MET POLY CAPACITOR 20 RADIAL 470pF 2KV CERAMIC CAPACITOR 20 RADIAL AS C6 56nF 400V POLY CAPACITOR 20 RADIAL 100nF POLY CAPACITOR 20 RADIAL 100uF 385V ALUM ELECT CAPACITOR 20 50 RADIAL 220uF 385V ALUM ELECT CAPACITOR 20 50 RADIAL 4 7uF 35V ALUM ELECT CAPACITOR 20 50 RADIAL 100nF 400V MET POLY CAPACITOR 20 RADIAL 4700pF 100V CERAMIC CAPACITOR 2096 RADIAL COMP REF No PART NO COMPONENT DESCRIPTION O C16 C17 C13 C20 C21 C22 C23 C24 C25 C26 28 C30 C31 C32 33 C34 C101 102 C103 104 C105 C106 C201 202 C203 C204 C205 C206 C207 C208 C210 C211 C212 C213 C214 215 C216 217 C218 C220 C221 C222 C222 C222 C222 C223 C224 C225 C301 C302 303 C304 C305 306 C306 C307 C308 C310 C311 C312 1446 LF 1446 L12 1451 MQ3 1241 AS 1241
41. RF223DJO RQ473AL2 RF331DJO RF103DJO RF472DJO 1241 AS 1441 AL 1441 1442 RF331DJO R0154LJO RL102GJO RF224GJO RF183DJO RQ103AL2 RF223DJO RF331DJO RQ473AL2 RO154LJO RL103GJO 1441 AL 1441 AS 1441 MS 1442 ALL MODELS 1241 AS RL102GJO RF224GJO RF183DJO RQ103AL2 RF223DJO RQ473AL2 RF331DJO RK222GKO 1441 AL 1441 AS 1441 MS 1442 ALL MODELS 1486 LI2U 1449 AS 1241 AS 1446 LF 1446 L12 RK105GKO 5K5 CARBON FILM RESISTOR 5 0 25W AXIAL 15K CARBON FILM RESISTOR 5 0 25W AXIAL 18K CARBON FILM RESISTOR 5 0 25W AXIAL 27K CARBON FILM RESISTOR 5 0 25W AXIAL 3R3 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARB MIN WW H VTG 20 4W 3308 CARBON FILM RESISTOR 5 1W AXIAL 1RO CARBON FILM RESISTOR 5 0 25W AXIAL 3R3 CARBON FILM RESISTOR 5 0 25W AXIAL 1K CARBON FILM RESISTOR 5 0 25W AXIAL 180R CARBON FILM RESISTOR 5 1W AXIAL 150R CARBON FILM RESISTOR 5 0 5W AXIAL 33R CARBON FILM RESISTOR 5 0 25W AXIAL 220R PRESET POT CARB MIN 20 0 1W H MTG 15K METAL OXIDE RESISTOR 5 2W AXIAL I 100R FUSIBLE METAL FILM RESISTOR 5 0 25W AXIAL 22K CARBON FILM RESISTOR 5 0 5W AXIAL 1K8 CARBON FILM RESISTOR 5 0 25W AXIAL 1K PRESET POT CARS MIN H MTG 20 0 1 W 2K2 CARBON FILM RESISTOR 5 0 25W AXIAL 4K7 CARSON POT CARB MIN MTG 20 0 1W 33R CARBON FILM RESISTOR 5 0 25W AXIAL 10K CARBON FILM RESISTOR 5 0 25W AXIAL 470R CARBON FILM RESISTOR 5 0 25W AXIAL 33R CARBON FILM RESISTOR 5 0 25W
42. STOR 5 0 25W AXIAL 10K CARBON FILM RESISTOR 5 0 25W AXIAL 6K8 CARBON FILM RESISTOR 5 0 25W AXIAL 22K CARBON FILM RESISTOR 5 0 25W AXIAL 4R7 METAL OXIDE RESISTOR 5 2W AXIAL 4R7 FUSIBLE METAL RESISTOR 5 0 5W AXIAL 120K CARBON FILM RESISTOR 5 0 25W AXIAL 180K CARBON FILM RESISTOR 5 0 25W AXIAL 68K CARBON FILM RESISTOR 5 0 25W AXIAL LINK 5mm x 14mm x 5mm COMP REF MODEL NO PART NO R32 1431AP MS 1431AP DS 1451AP DS 2040 CS5 R101 R102 107 R108 R110 VR1 1 1 VR11 1 1451 AS 1441 AS 1241 AS VR111 1439 AS 1431 AP MS4 1431AP DS 1435 MS 1439 MS R112 113 R114 116 R117 R118 R120 123 R124 R125 R126 R127 128 R130 R131 133 VR134 R135 R136 R137 R138 R138 1441 AL 1441 AS 1441 MS 1441 MS4 1496 LI2U 1486 LI2U 1451 AS 1451 MS 1451 DS 1451AP MS4 1451AP DS 1449 AS 1241 AS 1446 LF 1446 LI2 1241 AT R140 R201 R202 R203 R204 R205 R206 R207 R208 RF392DJO RF103DJO RF152DJO RF474DJO RF474DJO 0025 05 RQ104CL1 KP0026A08 RF103DJO RF472DJO RF632DJO RF222DJO RF153DJO RF472DJO RF153DJO RF103DJO RF222DJO RF222DJO RF102DJO RQ103AL2 RF103DJO RF185DJO RF105DJO RF1850JO RF474DJO RF273DJO RF223DJO RF686DJO RF156DJO RF226DJO RF394GJO RF103DJO RF101DJO COMPONENT DESCRIPTION 390R CARBON FILM RESISTOR 5 0 25W AXIAL 1K CARBON FILM RESISTOR 5 0 25W AXIAL 150R CARBON FILM RESISTOR 5 0 25VV AXIAL 47
43. TORY PRESET ADJUSTMENTS NOTE Certain preset adjustments can be from above or below main panel Adjustments are best made on static display preferably a MICROVITEC test card details of test equipment are available on application 1 Set VR4 A Adjusted accurately at the factory to give 124V with a dark picture on R138 137 right hand side 5 and should not be re adjusted WARNING THIS IS A CRITICAL SAFETY ADJUSTMENT FAILURE TO COMPLY WITH THE ABOVE WILL INVALIDATE THE WARRANTY 2 Line Frequency VR218 A Set free running oscillator frequency to almost frequency of incoming line syncs B Adjust VR218 feed monitor with R G B video and interrupt the mixed sync information to line oscillator by removing sync information on PL101 sync 1 2 or 3 etc C Adjust VR218 until picture almost stabilizes then re connect PL101 as required Resulting in a stable picture lock 3 Field Frequency VR307 A Control of free running field oscillator frequency is achieved by VR307 being adjusted to give a stable picture lock For effective lock VR307 should be set to centre of locked picture range 4 Line Phase VR220 A VR220 controls positioning of video information relative to raster in line scan direction B Ensure the following operations have been effected 1 The line frequency has been set VR218 2 The picture width has been set L202 3 The monitor is positioned in its place of use NOTE VR220 whe
44. W RESISTOR 5 4W AXIAL 15 FUSIBLE WW RESISTOR 5 2W8 RADIAL 10R METAL OXIDE RESISTOR 5 2W AXIAL 39K CARBON FILM RESISTOR 5 0 5W AXIAL 10R FUSIBLE METAL RESISTOR 5 0 5W AXIAL 150K CARBON FILM RESISTOR 5 1W AXIAL 2R2 WW RESISTOR 5 4W AXIAL 680K CARBON FILM RESISTOR 5 0 25W AXIAL 12K CARBON FILM RESISTOR 5 0 25W AXIAL 470K CARBON FILM RESISTOR 5 0 25W AXIAL 680K CARBON FILM RESISTOR 5 0 25W AXIAL 470K PRESET POT CARBON MIN 20 0 1W V MTG 100K PRESET POT CARBON MIN 20 0 1W V MTG 150K CARBON FILM RESISTOR 5 0 25W AXIAL 1K8 CARBON FILM RESISTOR 5 0 25W AXIAL 5K6 CARBON FILM RESISTOR 5 0 25W AXIAL 100K PRESET POT CARBON MIN 20 0 1 W V MTG 47K CARBON FILM RESISTOR 5 0 25W AXIAL 150K CARBON FILM RESISTOR 5 0 25W AXIAL 33K CARBON FILM RESISTOR 5 0 25W AXIAL 220K CARBON FILM RESISTOR 5 0 25W AXIAL 18K CARBON FILM RESISTOR 5 0 25W AXIAL 39K CARBON FILM RESISTOR 5 0 25W AXIAL COMP REF MODEL NO PART NO COMPONENT DESCRIPTION R317 R317 R318 R313 R320 VR321 R322 R323 R323 R324 R325 R326 R327 VR328 R801 R802 R803 804 R805 VR806 R807 VR808 R309 R810 R811 R811 R812 R813 R 814 815 R816 VR817 R818 R819 VR820 R821 R822 R822 R823 824 R825 VR826 R827 VR828 R829 R830 831 832 833 R833 RF563DJO 1241 AS RF154DJO RF184DJO RF274DJO RF330DJO RS103PL2 RF332JJO RF100DJO RF333DJO RF103DJO RF182JJO RF152GJO RF331DJO RQ222AL2 RO154LJO RL102GJO RF224GJO RF183DJO RQ103AL2
45. connector PL101 located on SERIES 3 main chassis PCB and the monitor s user 7 pin Din input socket NOTE The customer contrast control VR111 shown on the SERIES 3 main chassis circuit diagram is not fitted as shown when the PROM interface is used In this case the customer contrast control pot is connected to PL2 located on the PROM interface panel 2 CONNECTION DIAGRAM provides wiring interconnection details CIRCUIT DIAGRAM 1 The circuit diagram for the PROM INTERFACE PANEL provides circuit details of the panel assembly Component values are given in the accompanying LIST of COMPONENTS CIRCUIT DESCRIPTION 1 The purpose of the PROM interface panel is to convert 4 Bit digital video signals normally referred to as R G B amp Intensity into Linear R G B signals 2 Colour Combinations 4 1 There are 16 possible colours which can be displayed 2 combinations 2 2 afusible link PROM provides sixteen 8 bit outputs corresponding to one of the 16 addresses selected by the R G B and intensity signals These outputs use 3 bits for RED and GREEN and 2 bits for BLUE video hence there are 8 levels of Red and Green and 4 levels of Blue available 3 Resistors R3 to R10 and resistors R11 to R18 form potential dividers respectively between base and collector resistors of TR101 TR102 TR103 located on the SERIES 3 main PCB Resistors values are selected to weight re
46. e Handling Wear heavy protective clothing including gloves and safety goggles with side shields Handle the tube with extreme care Do not strike scratch or subject the tube to more than moderate pressure Particular care should be taken to prevent damage to the seal area OPERATING SAFETY We recommend after effecting any Service and or replacement of any part of the monitor or after any repair work that the SAFETY CHECKS listed following are carried out Note Ensure on re assembly that ALL earth conneciions are replaced SECURELY in particular safety earths and the P band and dag earth CRT earth connections Important Failure to observe the points noted could affect your own safety the product s safety and ultimately that the user SAFETY CHECKS Earth Continuity Check a Using a suitable multimeter Check between Dag earth on the CRT and mains plug earth pin safety earth connection The reading should be less than 470Kohm with tube discharged b Check mains earth continuity between mains plug earth and 1 CRT P Band 2 PCB Earth pin on main chassis The final assembly housing should be checked for continuity between the mains plug earth pin and ALL exposed metalwork Note Tests b and c should have a resistance of less than 0 5 ohm High Voltage Isolation Insulation Checks a On the mains supply pin plug check between live and neutral to earth for leakage breakdow
47. emoval 1 Remove EHT lead from CRT and discharge CRT final anode to the earth braid 2 Unsolder the following Lead from line output transformer overwind 1 focus lead 2 to tube base panel at the tripler end 3 Unsolder from main PCB Earth return 3 from focus control clamp diode earth return 4 4 Loosen but do not remove tripler securing screws 5 then withdraw tripler module 6 from main PCB B Tripler Module Installation 1 Position tripler module 6 on main PCB assembly and secure with screws 5 2 Solder on main PCB Earth return 3 from focus control clamp diode earth return 4 3 Solder Lead from line output transformer overwind 1 focus lead 2 to tube base panel at the tripler end replace insulation sleeve on connection 2 NOTE Ensure all soldered connections are smooth and connecting wires kept as short as possible to guarantee adequate voltage clearances 4 Connect EHT lead to CRT final anode NOTE Replace the insulation sleeve on connection 2 Tripler Removal Installation Fig 4 TYRAP POSITIONS ON CABINET BACK COMPONENTS MODE SWITCH NR DIN SOCKET CONTRO MAINS INPUT Sr tyrap near to ends SWITCH of outer insulation tyrap Note All tyraps to be fully tight MODIFICATION FOR IBM APPLE INTERFACES 1 Remove TR1 BC337 and replace with TIP 120 as shown 2 Remove R1 6 8 and replace with 8K2 1 4 watt 5 3 Race a 10 mic
48. es B Adjust red green and blue gain controls 3 2 3 4 Adjust VR903 for red peak to peak drive volts at R926 Adjust VR910 for green peak to peak volts at R925 Adjust VR916 for blue peak to peak volts at R924 Above voltages are a 70V p p on 14 monitor TTL mode b 70V p p on 20 monitor TTL mode c 60V p p on 14 20 monitor medium and high resolution WARNING 1 Main A REMOVAL INSTALLATION DETAILS ENSURE MONITOR IS DISCONNECTED FROM MAINS ELECTRICAL SUPPLY BEFORE EFFECTING THE FOLLOWING OPERATIONS PCB Removal Installation Fig 1 Disconnect EHT lead 1 from CRT to ensure no charge remains on tnpler connect to chassis metalwork Discharge CRT final anode by connecting it to CRT dag Disconnect PL201 2 PL1 3 and on cabinet versions PL2 4 if fitted and mains plug Remove tube base panel and CRT earthing braid tag Remove P band earthing tag 5 from main PCB located next to tripler module Release in turn each of the nylon self locking PCB support clips 6 lifting PCB slightly in each case Disconnect PL101 7 PL102 8 then disconnect tube base from CRT The main PCB may now be removed by lifting upwards and withdrawing from the rear For installation effect the above operations in reverse order TUBE BASE PANEL Removal Installation Details Fig 1 CRT Removal Installation Fig 2 CRT Removal Installation Fig 2 A Effect operations 1 A
49. f incoming syncs When the two signals are not aligned the coincidence detector is used to switch filter into a short time constant mode giving a high input impedance at pin 12 thus increasing sensitivity and loop gain of oscillator The phase locked loop now has a low noise immunity but has a very wide capture range When aligned coincidence detector activates the time constant switch causing low impedance on pin 12 achieving a lower sensitivity and loop gain but providing a high degree of noise immunity During the locked condition the operates with a long time constant NOTE A short time constant mode can be achieved manually by connecting the output of the coincidence detector on pin 11 to ground Allowing the oscillator to follow rapid fluctuations in line period which may occur on some non standard signals 4 Line Driver Stage A X Horizontal drive pulses from pin 1C201 are D C coupled to TR2Q1 and used to control driver transformer T201 providing the impedance conversion necessary to provide 600mA forward base current for saturation of line output transistor TR202 Ringing is damped by R225 and C214 at TR201 turn off thus limiting its Vce to a safe value HT supply to the line driver comes from main HT supply rail prior to R231 and HT scan interlock PL201 pins 5 6 allowing its operation to be checked independently of the line output stage IC201 PIN 3 with 10 to 1 scope probe TR202 CO
50. he TTL signal thus producing a buffered signal output THE G Y OUTPUT 1 4 This signal is generated by mixing the following a The B Y clamped signal TR16 performs this mixing function b The R Y clamped signal TR16 performs this mixing function The proportions of B Y and R Y clamped signals which are added together are set by R54 and R40 G OUTPUTS a This signal is produced by the addition of the following signals i G Y clamped signal TR17 performs this function ii V clamped signal TR17 performs this signal function TR18 has its threshold set by R48 and R49 the gam is thus set by R50 and R51 in order to produce suitable TTL levels 5 TR19 emitter follows the TTL signal and produces a buffered output PROM INTERFACE PANEL GENERAL 1 The Programmable read only memory PROM interface panel is used with certain models in the SERIES 3 range of colour monitors Two different versions of the panel assembly be used depending on model and intended country of operation 2 Basically the two versions are very similar 1 Versions incorporating R F I filtering networks L C components Li to L3 amp C4 to C6 are employed with certain models intended for use in countries other than the UK 2 Versions without R F I filtering are currently used for models operating in the U K 3 Interface connections 1 When installed this panel assembly interfaces between input
51. inputs Adjust red green and blue 1 Adjust VR906 for red cathode black level volts 2 Adjust VR914 for green cathode black level volts 3 Adjust VR921 for blue cathode black level volts 4 The above voltages are a 150V 14 monitor TTL or Linear b 155V 20 monitor TTL or Linear c 140V 12 14 high res monitor TTL or Linear C Adjust A1 voltage 1 Adjust VR932 until a raster is just visible 2 Raster colour may be neutral However it is very likely shaded towards red green blue or a combination of any two colours 3 Establish raster colour shading as follows a Red and Green Yellow b Red and Blue Magenta c Blue and Green Cyan 4 Reduce black level of remaining one or two guns using VR906 VR914 VR921 or combination until a neutral raster is achieved Re adjust VR932 to just extinguish raster Input R G B and sync signals then adjust VR111 clockwise If correct white balance has not been achieved repeat operations C 1 thru 6 33 3 12 Adjust Colour Gain Controls CAUTION MAKE THE FOLLOWING ADJUSTMENTS USING A DC COUPLED OSCILLOSCOPE ONLY A Prepare to adjust colour gain controls 1 2 3 Disable beam current limit circuit by removing TL901 in series with CRT heaters on tube base panel Provide a test pattern with peak white and black level information on red green and blue Ensure VR111 is fully clockwise to provide maximum drive voltages to video output stag
52. le change over switch as shown in the diagram 2 Triple Standard Input Wiring details to accommodate Triple Standard inputs and the various input options are given in the 17 Way Harness Connections Diagram and the accompanying Table of Options Suitable additional switching may be incorporated to accommodate the various options depending on user require ments OPERATIONAL NOTES 1 PAL Sync Input When this input PL1 pin 16 is used as the separate sync input of a 1v 75R R G B sync video source the amplitude of the sync MUST BE between 0 2v p p and 0 7v p p nominally 0 3v peak to peak If the amplitude exceeds these values an In Line B N C attenuator must be used 2 Sync On Green Option Setting Plug Link TL1 on the PAL Interface PCB to Position 2 allows a sync on green 1V 75R RGB Video Source to be used NB Note that the Green 1V 75R video input PL1 pin 12 now also becomes the PAL input See wiring diagram and Table of Options BRIGHTNESS CONTROL LIMIT If required a resistor of 5K6 ohms 0 25W may be incorporated in series with the brightness control to limit the control s range of brightness variation as shown in the diagram AUDIO STAGE On some versions of the interface either single channel or twin channel audio amplifier stages may be incorporated depending on model and specification Inputs and outputs for the audio stage s are marked as left hand channel L and right hand channel R a
53. lue video Fig 1 9 Normal inverse T T L video 10 Ground 4 Synchronisation Options SYNC OPTIONS INPUTS PL101 LINK POSITION SYNC OPTIONS INPUTS PL101 LINK POSITION MIXED ve going pin 7 TL102 not fined TL106 in position 1 pin 7 TL102 fitted ve going TL106 in position 1 SEPARATE TL102 not fitted TL106 in position 1 TL102 fitted TL106 in position 2 TL102 not fitted TL106 in position 1 Customer Controls NOTE On D series monitors the controls listed below are located on the front of the monitor concealed behind a downward hinging door A ON OFF Switch 1 Mounted rear of the monitor allows mains to be switched on and off without switching the mains supply off B Contrast Brilliance Adjustment VR111 1 Mounted rear of main PCB only active in T T L mode and allows video gain to be varied from maximum to minimum at black level C Brightness Adjustment VR134 when fitted 1 Mounted rear of main PCB next to VR111 Active in all modes of operation allowing brightness of display to be varied above or below cut off D Volume Audio Adjustment when fitted 1 Mounted rear of the monitor allows user to adjust volume audio level of the monitor Clockwise to increase anti clockwise to decrease E Colour Saturation Control when fitted 1 Mounted rear of the monitor allows user to adjust the colour level of the monitor Clockwise to increase anti clockwise to decrease FAC
54. n This test should be made with 1 5KV to 1 6KV AC or DC equivalent On Test 1 No breakdown should occur 2 Earth leakage should be less than 6mA at 1 5KV b Insulation resistance should be greater than 2Megohms at 500V DC CAUTION A MONITOR FAILING ANY OF THE ABOVE CHECKS MUST BE RESTORED TO SAFE WORKING CONDITION BEFORE BEING RETURNED TO THE USER SAFETY STANDARDS SAFETY AND ISOLATION UNDER NO CIRCUMSTANCES SHOULD ANY FORM OF REPAIR OR MAINTENANCE BE ATTEMPTED BY ANY PERSON OTHER THAN A QUALIFIED ENGINEER Switched Mode Power Supply Although the outputs from the power supply are isolated from the incoming mains supply the bridge rectifier and the ontrol and regulation circuit ARE NOT isolated Therefore when servicing the power supply section of the chassis assembly the SMPSU should be supplied by a MAINS ISOLATION TRANSFORMER OF AT LEAST 300VA RATING HANDLING PRECAUTIONS HT Electrical Charges The power supply section remains charged with respect to chassis for 30 60 seconds after switching off Care should be taken when handling the chassis to avoid touching this area during this time EHT Charges Horizontal Line Output Stage CRT Before handling or attempting adjustment or replacement on the horizontal line output stage or on CRT areas always discharge the final anode of the CRT by using a suitable EHT probe only Do this by connecting first to CRT dag earth coating earth braid assembly and then t
55. n adjusted will shift the picture right or left 5 Width L202 CAUTION SHOULD BE TAKEN WHEN ADJUSTING THIS COMPONENT DUE TO ITS PROXIMITY TO EHT SECTION IN PARTICULAR TRIPLER AND LINE OUTPUT TRANSFORMER A Using a non metalic trimming tool adjust L202 to effect picture width adjustment 6 Height VR306 A VR306 when adjusted will provide for raster under scan and over scan 7 Field Linearity VR312 A Adjust VR312 to give a linear picture in vertical direction NOTE Best results are obtained by using a cross hatch type grid or MICROVITEC test generator 11 Field Shift VR321 A VR321 controls positioning of raster in field scan direction East West Correction VR328 NOTE Some models will not require this adjustment because east west correction is integral on certain types of CRT A Adjustment of VR328 will achieve straight verticals on left and right hand sides of pictures Focus A Located on end of tripler module set brightness control to normal viewing level then make focus adjustmeni Adjust Colour Background Controls black level NOTE These controls are factory preset If adjustment is necessary an AVO 8 multimeter and or oscilloscope will be required However best results are obtained by using an oscilloscope A Prepare to adjust colour background controls 1 Set customer contrast VR111 brightness VR134 and A1 VR932 fully anti clockwise 2 Disconnect R G B sync
56. nd are terminated in 2 pin connectors Normally only a single channel audio stage is provided in most applications Audio input to the stage may be fed across a 47k gain control pot with the slider taken to the audio stages input SCREWS TYPICAL AT SEVERAL LOCATIONS T SERIES CABINET 14 INCH MODEL A foam polyurethane moulded cabinet incorporating a swivel base assembly T SERIES CABINET COMPONENT PARTS IDENT NO PART NO DESCRIPTION PC5047102 FACIA CABINET BEZEL MOULDING 5046101 COVER MOULDING PC5045101 CABINET BASE MOULDING PC5044101 CABINET PLINTH MOULDING M3 SCREW TYPICAL AT SEVERAL LOCATIONS M SERIES CABINET 14 AND 20 INCH MODELS This cabinet is an all metal rugged construction The 20 inch model was deleted from production in December 1983 M SERIES CABINET COMPONENT PARTS IDENT NO PART NO DESCRIPTION 0066104 FACIA BEZEL MC0021105 CABINET TOP SIDE ASSEMBLY MC0019103 CABINET BASE ASSEMBLY MC0094103 CABINET BACK ASSEMBLY M2 SCREWS TYF ZAL AT SEVESAL LOCATIONS L SERIES CABINET 14 INCH MODEL This cabinet is constructed of high density structural foam A modern compact design available in different colours L SERIES CABINET COMPONENT PARTS PART NO DESCRIPTION PC0103105 FACIA CABINET BEZEL PC0104102 CABINET TOP SIDE ASSEMBLY PC0107102 CABINET BASE ASSEMBLY MOULDED 00308101 BASE PANEL MOULDED PC010510
57. nded devices will pass normal test both on site and in Service Workshops In this respect PCBs containing such wounded devices are a major cause of no fault found problems It pays therefore to cultivate static safe ways when dealing with such static sensitive equipment PRESET CONTROL ADJUSTMENT GENERAL Preset controls are initially set up at the factory and normally do not require adjustment unless a change is required in the input configuration for example typically to install a different graphics adaptor card in the associated host system Details of the preset controls with their use and adjustment is described following PRESET ADJUSTMENTS TO PROTECT AGAINST ELECTRICAL SHOCK HAZARD AND TO PROTECT THE MONITOR AGAINST SHORT CIRCUIT AND DAMAGE USE ONLY AN INSULATED NON METALLIC TRIMMING TOOL TO MAKE AD JUSTMENTS TO THE PRESET CONTROLS Care should be taken when adjusting presets Adjust only one at a time and note carefully the effects of the adjustment before proceeding on to other adjustments In some cases it may be advisable to take note of the original setting position of the preset BEFORE adjustment in case the need arises to return to the original setting INTERCONNECTION COMPATIBILITY On installation and prior to preset adjustments ensure that video and sync connections from the host system are compatible with a The monitor b The interconnecting lead assembly use Having determined these points a
58. o CRT final anode anode button poppy connector Please Note Very considerable electrical charges can be stored in these areas even for lengthy periods of time after switch In the interests of your personal safety observe the precautions listed SAFETY CRITICAL COMPONENTS Components marked on the parts list and circuit diagram are safety approved types and they should be replaced only with components supplied or approved by our Service Department It is also recommended that the components not marked with the safety symbol should be replaced by parts of the type originally fitted and this applies particularly to those resistors which are stood off the printed circuit boards HANDLING PRECAUTIONS STATIC ELECTRICAL CHARGES Depending on equipment type and model the equipment may contain devices h may be damaged by static electrical charges during handling Generally these devices are indicated by a symbol When replacing or handling these devices or PCBs containing such devices care should be taken Soldering irons should be earthed and personnel should use wrist straps earthed via a 1Mohm resistor If the latter is not practicable they should discharge themselves of any static electricity by touching an earthed point Static sensitive devices should be packed in suitable conductive containers Note Electrostatic discharge does not necessarily kill a component completely more likely it will wound it Many static wou
59. ormal operating conditions B When turn on of TR2 occurs in this manner once every 20ms the oscillation becomes self sustaining R8 continues to supply current but is swamped by forward base drive from R16 3 A TR2 COLLECTOR Fuse in Over Voltage Protection Controlled by a second feedback loop attached to TY1 consisting of 1 Azener diode which senses the reference rail voltage and HT voltage proportionally 2 If this reference exceeds zener voltage 020 conducts fires TY1 and terminates drive to TR2 During which time enough volts are developed across TY2 gate cathode to cause conduction and latch on 3 Drive to TR2 is stopped until C23 is fully discharged 10ms 4 Power supply is off until the next mains start up pulse 4 Short Circuit Protection A Short circuit or over current on any output rail represents an increase in stored energy required from T2 therefore an increase in collector current through TR2 detected by R15 Thus TY1 is fired and TR2 turned off Now operating in Burst Mode that is the power supply is initiated under normal start up conditions but only operates for a few switching cycles when the over current protection comes into operation terminating drive to TR2 VIDEO INPUT INTERFACE CIRCUIT DESCRIPTION AND OPERATION INPUT Connections are made at PL101 red green and blue video sync options 1 2 3 and TTL video normal invert All inputs are flashover protected by
60. pecification list 1431 1432 contains a full specification subsequent lists contain only the areas that differ from the first list For example the supply is 180 265 volts 48 64 Hz excluding 110 volt models This will only be given on the first specification list Therefore unless otherwise stated refer to specification 1 Circuit Diagram and Parts Listing There are many model variants in the Microvitec CUB range and obviously it would not be practical to supply all the circuit diagrams We have therefore devised one circuit diagram for the main P C B assembly including Standard Medium Resolution Tube Base assembly and a separate circuit diagram for the High Resolution Tube Base assembly In addition there are no component values on the circuit diagrams you should refer to the Parts Listing Component location is another problem that you may encounter To assist you in this matter we have also included a full P C B layout Fault Isolation and Repair Procedure Configured in a boxed flow chart format it represents repetitive faults encountered by our own Service Technicians Each fault is accompanied by a series of boxes which will ask you to check a particular part of the equipment After you have carried out the check a question is asked refer to Fig 1 INTERMITTENT LINE SYNC CHECK 210 A DRY JOINT NO WAS A DRY JOINT FOUND YES Fig 1 From the result of the question you can then answer YES or NO
61. re correct proceed with the adjustments required according to the details given in the accompanying table and descriptions following PRESET CONTROL SETTINGS 1 To set the preset controls use a signal generating a display occupying as large a screen area as possible For example a full page of upper case letter H would be suitable or alternatively a suitable test card as appropriate 2 Preset controls in the table following marked with an asterisk may be adjusted if required However normally this should not be necessary as these presets are set accurately at the factory during manufacture NOTE Acircle is employed in the screen displays illustrated following only to demonstrate more clearly the geometric effects of wrong settings PRESET LOCATIONS The physical locations of most of the preset controls referred to in the descriptions following are shown in the illustration contained in the Section preceding Notable exceptions are preset controls contained on the TUBE BASE PCB assembly The positions of these presets are indicated on the individual PCB s by appropriate ident markings LINE FREQUENCY PICTURE BREAKS UP PICTURE LOCKED ADJUST LFREQ HEIGHT SET ADJUST F FREQ x HEIGHT ADJUST HEIGHT AL X WIDTH WE m LINE PHASE FIELD LINEARITY VERTICAL BOTTOM OR TOP LINEARITY OF PICTURE VERTICAL SCAN COMPRESSED LINEAR ADJUST F LIN t LIN SET EAST WEST CORRECTION PICTURE
62. removed check the following Signal Wires On Cabinet Back Components DIN sockets BNC sockets mode switches brightness contrast controls etc a is now the practice to fit a tyrap fastener onto the signal wires on each component See diagrams A tyrap should be fitted to any component which is found not to have one Note The signal wires are already mechanically twisted onto each pin and then soldered this modification provides additional wire attachment b If it is possible to move any of these signal wires away from its normal position to touch the small exposed section of the terminals on the main switch then sufficient tyraps should be fitted to these wires to hold them in position Note This does not apply to wires which are already contained within a secondary sleeve Single Insulated Mains Wires On Mains Switch This only applies to the short sections of mains cable from which the outer sheath has been removed to allow the individual wires to be attached and soldered to the mains switch If it is possible to move any of these short sections of wire away from its normal position to touch a pin on one of the cabinet back components then sufficient tyraps should be fitted to the mains wires to hold them in position See diagram
63. rofarad 35V electrolytic as follows i negative side to top of existing C4 position ii positive side mechanically wrapped around and soldered to left side of R3 SWITCH MODE POWER SUPPLY DESCRIPTION AND OPERATION The power supply is a variable frequency self oscillating switching flyback convertor type providing mains isolation and three stabilised voltages of 18V 124V and 200V 1 Control Circuit Description A Operating Normally In A Ready State TR2 turns on a step voltage whose amplitude depends on the instantaneous value of rectified mams across T2 primary Current in winding and TR2 collector increases in a linear fashion from zero in which time energy is stored as flux in the transformer During this time D22 D23 and D24 are reverse biased and any load energy is supplied by C27 C28 C31 and C26 from previous cycle TR1 performs a control function supplied from a reference winding on transformer nominal 30V During ON time of TR2 the emitter of TR1 is held at a constant with regard to reference rail from D18 The base of TR1 is fed directly from the reference rail via R3 VR4 and R5 any voltage change on the reference arising from a change of voltage at the main output will vary causing the constant current source used to charge C16 to vary in sympathy C16 charges on the current available from R10 The voltage across C16 increases until it reaches the gate trigger voltage of TY1 Then TY1 cond
64. rovides an output in phase with input and of suitable amplitude for driving 201 directly via R201 and TL106 Separate negative line and field syncs Ensure TL102 in non active position line syncs are fed in PL101 pin 5 IC101 performs an exclusive OR function the output being an inverted composite sync waveform Separate positive line and field syncs Fed in on PL101 pin 7 in its grounded position TL106 is switched over to inverse field option IC101 provides an attenuated and buffered line sync feed for IC201 via R201 Positive field sync information is fed directly PL101 pin 3 sync3 input by TL106 B and R202 LINE TIMEBASE DESCRIPTION AND OPERATION 1 Line Timebase A Line oscillator function is based IC201 providing three outputs 1 2 3 Horizontal drive pulses for control of line output stage Vertical sync pulses compatible with synchronisation of IC301 field output IC A sandcastle pulse providing burst gate and clamping information NOTE This facility is only used with IC TDA3301 currently required by 1 volt 75 ohm linear PAL input monitors 2 Sync Separator A IC TDA1180P incorporates separate noise gated sync separators for line field synes which accepts positive going sync pulses or negative going composite video on pins 8 and 9 Output pulses from the line sync separator are used in conjunction with a sync gate to synchronise line oscillator in a phase locked loop circuit
65. se picture bounce thus maintaining accurate tracking of the field scan with line scan amplitude during CRT beam current variations therefore reducing picture breathing effects 4 Field Output A Sawtooth output on pin 1 is applied to output stage within IC301 and scan output is available from pin 4 to field deflection coils Current within coils is sampled by R323 then fed back via R31 7 to the virtual earth input pin 10 of IC301 B Gain of output amplifier is set by the ratio of R314 and R31 7 DC operating point by R318 and R316 IC301 PIN 4 with 10 to 1 scope probe 5 Picture Geometry A CRT E W pincushion distortion is corrected by modulation of line deflection current in transductor T202 actively driven by TR301 which is then fed from the parabolic waveform at the top of the S correction capacitor C311 AC gam from the amplifying driver is used to control amount of correction applied to CRT Pump e TR301 COLLECTOR with 10 to 1 scope probe CRT TUBE BASE PANEL DESCRIPTION AND OPERATION 1 CRT Tube Base Panel Refer to fig 1 2 Circuit Description A All CRT electrodes are protected by a resistor capacitor and spark gap 1 Scark gaps on all electrodes except focus are formed by a 1 2kV ring trap gap positioned within CRT base socket assembly High focus voltage has a separate 10kV spark gap contained within tube base socket CRT cathodes are stood off from video outpu
66. spective PROM outputs to least significant and most significant bits NOTE When the PROM interface Panel is installed the moveable links PL103 shown in the SERIES 3 main circuit diagram should be fitted into linked POSITION 1 3 5 Volt Supply 1 2 and C3 provides a regulated 5V supply for IC2 4 Protection amp Termination 1 Diodes D1 to D5 provide flash over protection for IC2 and for computer signal in sources 2 Reistors R21 to R26 may be fitted on some models to terminate incoming digital signals 5 Contrast Control 1 Transfer TR1 R1 and an external pot connected to PL2 provide for customer control of contrast on some models 2 TR1 forms an emitter follower the voltage at the emitter determining the video output amplitude on contrast LIST OF COMPONENTS PROM INTERFACE PANEL GENERAL 1 Components used in the Prom Interface Panel Assemblies together with possible component variations are listed following 2 Details of possible circuit variations used with different versions of the panel are shown in the accompanying Prom Interface Circuit Diagram RESISTORS 1 Most of the resistors employed in the construction are standard carbon film types of 0 25 watt rating 5 tolerance LIST OF COMPONENTS PROM INTERFACE Component Reference Part No Component Description RESISTORS R1 RF683DJO RESISTOR C F 6K8 0 25W 5 R2 RF391GJO RESISTOR C F 39R 0 5W R3 6 1
67. thru G then position monitor so that the CRT is face down on two padded support blocks B Remove two earthing screws 1 then refer to the illustrated mechanical parts section and remove the base of the monitor Remove the four nuts 2 and large washers 3 securing CRT to cabinet facia 4 D Carefully withdraw CRT vertically E Transfer degauss coil 5 and earthing braid 6 and scan coil lead assembly 7 to new CRT F Install main PCB assembly by effecting operations 1 A thru G in reverse order G CRT installation safety checks 1 Check for correct fitting of CRT earthing braid 6 2 Ensure black lead from CRT earth braid to tube base panel is connected 3 Check P band earth pin has been connected to main PCB 3 Line Output Transistor TR202 and SMPSU Output Transistor TR2 Removal Installation Fig 3 A Remove Transistor 1 Remove two M3 screws 1 securing transistor and heatsink to main PCB 2 Unsolder base and emitter connections on PC3 then withdraw transistor heatsink 4 3 Separate transistor from heatsink retaining insulating bushes 3 and mica washer 2 for refitment Install Transistor 1 Coat underside of transistor with thermally conductive heatsink compound 2 Effect operations 3 A 1 thru 3 in reverse order Line Output Transistor TR202 and SMPSU Output Transistor Removal Installation Fig 3 4 Tripler Removal Installation Fig 4 A Tripier R
68. to TR106 base to decrease R136 C105 filter the signal the derived voltage is emitter followed and supplies TR103 104 and 105 emitters directly Hence increases in CRT beam current above a preset limit achieving an automatic reduction in picture brightness NOTE CRT beam limiting is preset depending on monitor model Brightness of display in all modes is adjusted by VR134 enabling parallel adjustment of R G B and black levels within a or 20V range from nominal 400uA High and medium resolution 700uA 14 standard resolution TTL Linear 900uA 20 standard resolution TTL Linear TR102 A fast switching transistor used to derive mixed blanking pulses for flyback blanking of video information The base is driven from a potential divider mixer network from a line flyback pulse and a frame flyback pulse Line flyback is advanced in phase with C225 to allow for transistor switching delays D107 holds TR102 in a semi saturation state i sza U i 1 TR102 COLLECTOR with 10 to 1 scope probe IC101 is also used to provide the following sync options Composite negative sync Fed in on PL101 pin 7 ensure TL102 in non active position allowing pin 2 of IC101 to be pulled high where upon IC101 performs a sync inversion and provides an attenuated positive sync waveform for driving sync separators of IC201 via R201 and TL106 Composite positive sync Fed in on PL101 pin 7 with TL102 in its grounded position IC101 now p
69. ts by 220 ohm resistors the grid 100k and A1 s 820k Decoupling of grid and A1 s is achieved by C910 and C911 Focus voltage is provided by a potential divider located within tripler module providing an adjustable voltage of 5 8KV A1 voltage is adjusted by VR932 offering a range of 350 820 volts CRT heaters may be disconnected by removing TL901 in order to make video adjustments CRT cathodes are directly driven from video output stages mounted on CRT panel NOTE The component values given in this section refer to a standard 14 inch model For equivalent values refer to the parts listing 3 Video Output Stages Circuit Description and Operation NOTE Red Green and Blue video outputs are identical the following text refers to the red output stage A TR902 forms a class A amplifier AC gain is derived from the ratio of R935 to R902 VR903 DC gain by a DC offset current from R905 and VR906 B R904 forms video output load and TR902 represents a low impedance drive source to CRT input capacitance during its conduction During turn off of TR902 the source impedance of the load R904 is considerably reduced by TR901 ensuring a good pull up performance D Video compensation is achieved by split capacitances C902 C903 to help maintain a constant amplifier response curve over the full range of VR903 E The emitters of TR902 TR904 and TR906 are connected together with a DC reference of approximately 7 5V
70. ucts and crow bars base drive to TR2 TR2 ceases conduction and its collector voltage becomes positive The dV dT at TR2 collector is limited by C17 R12 and D17 As this occurs D22 D23 D24 and D21 become forward biased and stored energy within the transformer is transferred into output capacitors and their respective loads Eventually voltages on D6 D21 D22 D23 and D24 anodes collapses TY1 is forced off prior to this stage by negative anode voltage allowing TR2 to turn on Full base drive is then sustained by R16 TR2 BASE Fuse in TR2 BASE START UP Fuse out 10 HT stabilisation a HT stabilisation is achieved by controlling the duty cycle of the switching transistor b Increasing load increased duty cycle and peak collector current c Increasing mains supply increased operating frequency d HT adjustment is made by VR4 e Extra damping for C14 R6 and D7 are required to limit Vce of TR2 015 and D16 provide negative off drive and base current tracking L2 optimises storage time of TR2 for minimum switching losses 11 Max available power is determined by measuring peak collector current of TR2 and is sensed by R15 If voltage across R15 exceeds voltage across TY1 gate cathode then TY1 conducts turning TR2 off NOTE This sequence occurs during start up at low mains and under fault conditions 2 Start Up Procedure A Current required at start up is small compared with base drive current under n
71. ular 333mm screen diagonal Automatic degausing at switch on High focus voltage in line gun 90 deg diagonal deflection 0 31mm dot pitch black matrix screen with pigmented phosphors 0 31mm or 2 0 8mm screen edge NOTE As models 1431 and 1432 with the following exceptions RESOLUTION DOT PITCH CONVERGENCE ERROR 652 H x585 V 0 43mm 1 2mm screen edge 4 5 MODEL 2030 NOTE As models 1431 and 1432 with the following exceptions CONVERGENGE ERROR MAX RESOLUTION DOT PITCH CRT POWER CONSUMPTION MODEL 2040 0 4mm screen center 1 8mm screen edge 505 H x585 V elements 80 characters on 6 dot wide matrix 0 8mm Rectangular 480mm screen diagonal 90 deg deflection precision in line gun vertical stripe screen high voltage focus 80 Watts approximately NOTE As models 1431 and 1432 with the following exceptions RESOLUTION DOT PITCH POSITIONAL ERROR POWER CONSUMPTION CONVERGENCE ERROR 940 H x705 V 0 47mm or 4 80 Watts approximately 1 0mm screen edge ELECTRICAL SUPPLY Warning THIS APPARATUS MUST BE EARTHED Important The wires in the mains lead are coloured in accordance with the following code GREEN AND YELLOW EARTH BLUE NEUTRAL BROWN LIVE As the colours of the wires in the mains lead may not correspond with the coloured markings identifying the terminals in your plug proceed as follows 1 Earth The wire e ured GREEN and YELLOW must be connected to the terminal marked
72. wards 25Vsupp j 11 R305 R306 and R301 When field scan is completed the COuS pulse discharges C305 and C306 ready for charging cycle to be restarted 1 Field Linearity A Sawtooth output on pin of IC301 via R 13 and field linearity control IC301 PIN 1 with 10 to 1 scope probe 2 Field Flyback A In order to achieve a short fieid flyback time a supply voltage larger than required during scan must be applied to field deflection coils during flyback period Made possible by using a separate field flyback generator within IC301 Main HT supply for IC301 is supplied to 5 via D302 During flyback the generator doubles the supply on pin 5 the potential on pin 3 is switched from OV during scan to 25V during flyback The change in voltage occurs on pin 5 via C304 causing potential to double during flyback D302 isolates pin 5 from 25V supply When deflection coil field has collapsed and potential across field scan coils has fallen below 25V pin 3 is switched back to OV and scan cycle resumed D Synchronisation of IC301 is achieved by feeding a positive going field sync pulse on pin 8 of IC301 IC301 PIN 8 with 10 to 1 scope probe 3 Supply for IC301 A Derived from a scan rectified rail from the line output stage C305 C306 are fed via VR306 height control from scan rectified supply and 12V rail Proportions of current and associated time constants R303 C301 and D301 are used to minimi

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