Service Manual CDR779 - Wiki Karat
Contents
1. MNO OOWO NPN NNN 7 1 CNCNCNICN CNCNCN F if NAINA LOLOLOLOLOLOLO LL N WG WSR Qs NN e 00 O9st x C xOoO0 nm O NONO ONNMMNN CNCNCNCNCN MORNIN LOL CO mm LOO ONT NN NNNMNOOO NN MMMMMNMM NO LO E MEME TYPE M M GE D COCNCNCNON TN Ex LOLOLO st Ommmmot o i rn CORE AN wn NR OON DS CNCNCNCN MMMM MLOO NNS MMMM SIE j hd HONS REPLACE ONLY WITH SAME TYPE OF FUSE CODAMOO k k oO OcOt N i Y e zm EG CNONCNCNCN PO n MMMM Ce c oO CQr o0or oO 00 CO O03 CANT RiSk OB BRE Al Fe UTILISER UN FUSIBLE moam OO NNMNN CACNCNCNCNCNCN CNCNCNCNCNCNCN NON YD MOOO Er NAMM2. SELOCOT COCO SE C OCDDOQOCOC 00 CNC NNN SY NT TOTS OD ONO NNNNNN IO OMMmANn Tm NNONOO OQO 6 NNCNCNCN POWER SUPPLY UNIT CDR3 ECO TOP VIEW POWER SUPPLY UNIT CDR3 ECO BOTTOM VIEW CNCNCNCN Spare parts list CDR779 10 EZ 3119 232259590023 VDR DC 1M A 423V S MAX Headphone board 800V B CD MAINBOARD 3123 482205021803 18k 196 0 6W 3124 482211712181 4702 20 0 5W 3125 482211710833 10k 1 0 1W Miscellaneous 3126 482211680176 125 0 5W 2100 4822 126 14585 100nF 10 50V 3127 482211680176 1Q 596 0 5W 1000 2422025 11704 CON BMH 16P F 1 00 FFC 2101 482212481151 22nF 50V 3128 482211680676 105 596 0 5W 0 3 R 2102 4822 126 14585 100nF 10 50V 3129 482211710833 10k 1 0 1W 1004 2422 543 00896 RES XTL SM 8M4672 30P 2103 4822 124 81151 22uF 50V 3134 4822 05021803 18k 1 0 6W CX 5F R 2104 5322 126 10511 1nF 5 50V 3141 482211710833 10k 1 0 1W 1006 4822 267 51454 CONN 11P FEMALE 2105 5322 126 10511 1nF 5 50V 3142 482205120109 109 5
3. Check the 5V NOK OK connect the mains inlet to a mains isolated variac HEREDES Miercoles pea AES NOK check the functionality of the following components o this voltage should be 1 41 x Vin ac 1120 2121 2125 2126 2127 6102 7125 OK YES n is power supply ticking check the load on the secundairy output check overload circuit 6141 7141 7150 NO NOK a i 5 2 check Vec on pin 7 1C7110 Sheck 2121 2133 2134 3123 3134 6130 6132 Vee 12V 16V replace 7140 OK check oscillator on pin 4 IC7110 NOK check 2102 3102 is the osc 30kHz working replace 7110 OK check the voltage on the source of 7125 YES check 3125 3126 3127 3128 Vsource 1 3V replace 7125 NO Vsource 0 8V Disconnect diode 6150 check 3201 3202 3203 3204 3205 start variac from OV and turn up slowly 5V NOK 3206 3207 3208 7131 7201 measure the 5V output If the 5V becoming higher than 5V the regulator circuit are damaged replace 7110 check circuit around Ic7110 SV OK After the power repaired check the 3 3V CL 06532151_024 eps 271100 Figure 8 16 Block diagrams Circuit diagrams and PWB s DR779 Em LIEB PSU CDR3 ECU A 0101 HCS0528 1 F100 F101 BZX79 C15 2 In e F102 1120 v 2322593 UF1922P4 1 2 CU15D3 5121 4 5120 3 0260 HEATSINK F201 F202 F223 F224 is BZX79 C15 CT283D3 F105 F106 A
4. F F103 T2 0A H 250V A F107 F112 0125 HEATSINK STP3NB60FP 5125 6230 e eor F204 7125 F111 5130 2130 aj UDZ 20B wn x 1 68u B 3112 6132 s BZX84 C24 4 22R BYDa3D P BYW98 200 1 3 5230 F203 E e e 12V IN GND OUT 2u2 3 BON N should be YK type 5240 F205 F206 6250 8V 10u F222 F207 F208 KB BYD33J 8 N N 68R 7253 BC327 25 7251 BC337 40 7252 BC857B 7110 UC3842A COMP Vib 6150 UDZ 4 7B F122 RtCt lsense OUTPUT UDZ 2 7B F211 F21 2 Vref 7131 vee CQY80NG GND Reserved Item Number 3204 10K 7201 TL431CLP 47u Reserved UF1922P Reserved Jumper 100u 2R7 Reserved CU15D3 Reserved 220u Reserved Reserved CU15D3 Jumper Unpolarized Unpolarized Polarized CL 06532151 013 eps 241100 0101 A2 0125 B5 0205 A12 0206 G7 0207 A11 0208 A10 0260 A7 1120 B2 2102 G4 2104 E4 2106 F3 2109 G4 2111 G5 2119 A3 2120 A3 2121 B6 2125 A5 2126 B5 2127 C6 2128 A5 2129 D3 2130 D6 2131 A7 2133 D5 2134 D5
5. MAIN 4228 CDR99 3104 123 4228 CL06532018 082 eps 010300 1500 D1 1541 D4 1542 A4 1543 B4 2500 E2 2501 F1 2502 F2 2504 A11 2505 H12 2506 H12 2507 H9 2508 l8 2509 l8 2535 B5 2536 B4 2537 B5 2541 D5 2543 B4 2544 B4 2546 C7 2547 F6 2548 D5 2550 H8 2551 G4 2552 H3 2553 H8 2555 F12 2556 G13 2557 F14 2558 F12 2561 F11 2562 H8 2563 H8 2565 D6 2568 A5 2571 D3 2572 E2 2574 E8 2575 E9 2577 F2 3531 C12 3532 C12 3533 A13 3536 C6 3537 C6 3538 C4 3539 D5 3540 E10 3541 F6 3542 E6 3544 F3 3545 G4 3546 G4 3547 H5 3548 H6 354917 3550 H10 3551 l6 3552 F5 3553 l6 3554 E5 3555 ES 3556 E4 3557 F4 3559 B12 3560 B14 3562 B13 3566 E10 3567 E11 3570 A12 5500 D2 5501 E2 5502 E2 5503 E2 5541 D4 5542 D4 5543 B3 5544 B3 5546 C7 5551 F11 5554 H10 5555 D6 5556 A5 5709 F2 6500 G11 6501 G9 6502 I11 6553 A11 6554 H9 7520 C6 7521 A G4 7521 B I6 7522 H5 7523 C6 7524 C5 7525 E11 7526 G5 7527 E5 7528 F4 752918 7535 A4 7548 18 7549 F11 7556 F13 7558 E8 7560 B12 7561 B14 7562 C13 7563 C12 F491 G5 F492 H8 F49317 F494 l8 F495 I9 F496 H8 F497 H10 F498 H10 F499 I F800 F801 F802 F803 F804 I F805 I F806 F807 F808 F809 I F810 F811 F812 1 F813 F814 F8151 F816 1 F817 1 F8181 F8191 F8201 F8211 F8221 F8231 F8241 F8251 F826 I F827 1 F828 F829 I F830 I F831 I F832 1 F834 1 F835 I F836 I F837 I F838 F839 I F840 I F841 I F842 1 F843 I F
6. 14 1500 D1 1541 D4 POWER PART 5543 AN 1542 F400 5VA gt gt D3V3 5544 EN 1A 1543 2536 100n TO DISPLAY BOARD F815 VDC2 F822 F823 Ld e 5500 nv P12VKILL POWER UP 1A MP 2543 3538 10K 7524 BC847B 3537 100K 7520 STD1 ZN05 D5V L5V F821 pe 12VCD ge 12VA FROM PSU c BND CASE GND CASE d 3104 123 4228 8 POWER UP KILL OUT F831 2571 100n 5709 8VA 10K 5VA 3544 47K F830 e 3554 10K 7527 7558 L78M09 P12VKILL We F84 F842 5V 12VPWR Y 12VCP 7526 22u 7 7521 A MC34072 1 3546 BC847B F491 e F836 100R 5V 3547 F846 15 2V 7522 IN So OUT 2574 100n 2575 ns 220u IE 10v 23 2V F496 2563 m 6501 BAV99 9SRVPWR 27 5V F499 5554 F498 e Ls 2g 6555 6556 6557 6553 Bt Bt BAS216 BAS216 Pl BAS216 BAS216 3571 0R F810 0 5K6 F811 3533 100K F803 11 8V BC857B 7561 7V F809 5K6 3562 5K6 3560 100K 3563 8VA Ki By 8V during normal operation 56K GNDA KILL_OUT 752
7. 6502 111 6553 A11 6554 H8 6555 A10 6556 A11 6557 A11 7520 C6 7521 A G4 7521 B 16 7522 H5 7523 C6 7524 C5 7525 E11 7526 G5 7527 E5 l 7528 F5 752918 7535 A4 7548 l8 7549 F11 7556 F13 7558 E8 7560 B12 7561 B14 7562 C13 CL06532018 065 eps 010300 7563 C12 F491 H5 F492 H9 F493 I7 F494 l8 F495 I9 F496 H8 F497 H11 F498 H10 F499 H9 F800 A6 F801 A12 F802 A6 F803 B13 F804 B14 F805 B6 F806 C8 F807 C8 F808 B13 F809 B12 F810 C11 F811 C12 F812 H3 F813 C5 F814 C5 F815 D2 F816 D2 F817 D2 F818 E10 F819 H12 F820 D1 F821 D7 F822 D2 F823 D2 F824 F11 F825 F11 F826 F12 F827 E2 F828 E2 F829 F14 F830 F4 F831 F3 F832 E11 F834 I7 F835 l6 F836 H4 F837 I7 F838 G4 F839 E6 F840 E6 F841 E9 F842 F5 F843 F7 F844 E3 F845 F4 F846 H5
8. CDR3 ECO a8 or x oN N d olf gt EJ EJ EJEJ C3 DABE NEU X NN ETE cap aaa oto eM qi Z076 zczz mo 9026 o ex He E ONO o zi NNN a wees vL OZ9 oo 1 _ Noo moOm mm CO XOONOOO NNS CNCNICNI e OOsFUOCO0O O Conmaocmacoa Y g Why Pl ha 5 2029 LO CNPOO ELO g OOo Y ZZ Y NSS ANNAN 5 KIM LOLO OO O O 0O CODO RCC 0Z6_ 01 OMNOOCO OONN TT ONCNCNCNI COCOCOCOCOCOCO CO COQ OOOO M ANVOOO CNCNCNCN wes IOo MONM
9. UC3842 The input voltage Vcc pin 7 is monitored by a comparator with hysteresis enabling the circuit at 16V and disabling the circuit below 10V The error amplifier compares a voltage Vfb pin 2 related to the output voltage of the power supply with an internal 2 5V reference The current sense comparator compares the output of the error amplifier with the switch current Isense pin 3 of the power supply The output of the current sense comparator resets a latch which is set every cycle by the oscillator The output stage is a totem pole capable of driving a MOSFET directly Figure B Blockdiagram UC3842 CL 06532151_019 eps 271100 Figure 8 11 8 2 4 Start up sequence t1 Charging the capacitor at Vcc C2129 wiil be charged via R3123 and R3134 C2133 and C2111 via R3129 The output is switched off During t1 t2 Charging of output capacitors When the input voltage of the IC exceeds 14 5V the circuit is enabled and starts to produce output pulses The current consumption of the circuit increases to about 17mA depending on the external loads of the IC At first the GB60 MM CDR779 Faultfinding Guide 8 2 5 OUTPUT capacitor at the Vcc pin will discharge because the primairy auxiliary voltage coming from winding7 9 is below the Vcc voltage At some moment during t2 the primary auxiliary voltages reaches the same level as Vcc This primary auxiliary voltage now determines the Vcc voltage t3 regulation Th
10. 0 1W 1205 5322 242 73686 CST12 00MTW TF01 3150 482211711139 1k5 196 0 1W 1206 482225251173 19398E1 1 000A PES 3151 4822 117 11148 56k 1 01W 1207 482225251173 19398E1 1 000A 3201 482211652176 100 5 0 5W 1208 4822 267 60409 BS A UNT 9 3202 482205013302 3k3 1 0 4W 1209 4822 265 30987 7SR gt CBLO 3 1 25 n 2 We dirae 100 zin 3203 482211652175 1000 5 0 5W 1210 242202511704 CON BM H 16P F 1 00 FFC 3102 482205120008 00 jumper 0805 3204 482211710833 10k 1 0 1W oon 3104 4822 051 20008 00 jumper 0805 9209 94822117 VIE s D LS UN 3106 4822 117 11503 2200 196 0 1W 3206 482205120332 3k3 5 0 1W Ar 3107 482211711503 2200 1 0 1W 3207 482205110102 1k 2 0 25W 3108 482205120122 1k2 5 0 1W 9208 SU rc Pre d 2100 4822126 14585 100nF 1096 50V 3109 482205120122 1k2 5 0 1W 3221 482205120122 1k2 5 0 1W 24 5 6 0 02 4822126 14585 100nF 10 50V 3222 482205120122 1k2 5 0 1W 2103 5322 122 31647 1nF 10 63V ee CE A E MEE E DE p 10 sov Sd e 4022116 22199 680 Se d OW 2105 482212481286 47uF 20 16V 2106 4822126 14585 100nF 1096 50V 7102 482220982362 NJM4556D 3229 482211713085 5k6 1 RC12H 0 1W 0805 3407 4822 124 81286 47uF 20 16V C geese ee Hd 3230 4822 05021002 1k 1 0 6W 2109 5322 122 32654 63V 22nF PM10 R AD E Merc S tee ON 2110 4822126 14585 100nF 10 50V 3283 482205120471 4700 5 0 1W 2111 4822126 14585 100nF 10 50V 3234 482205120332 3k3 5 0 1W 5 PSU CDR3 ECO 3235 4822116 52269 3k3 5 0 5W S is pees 13e ern TE dos y 4xxx 4822 05110008 09 5 0 25
11. 0603 2198 482212170141 33nF 5 400V 5255 482215751195 1 uH 20 4X9 8MM AXIAL 2135 4822 124 41796 22nF 20 16V 2129 4822 124 40769 4 7uF 20 100V 2137 4822 126 14494 22nF 10 25V 0603 2131A 4822 126 14497 2 2nF 20 250V gt 2 4928 12614494 EnF 1076 250803 EE S a le ede 2134 482212442084 100uF 20 35V 6100 482213034281 BZX79 B15 2141 4822 126 14238 0603 50V 2N2 COL R 2141 4822 12422652 2 2uF 20 50V 6101 482213034281 BZX79 B15 2142 532212232654 63V 22nF PM10 R 2142 4822126 14585 100nF 10 SOV 6102 482213083707 SINB80 2143 482212614241 0603 50V 330P COL R 2150 4822126 14585 100nF 10 50V 6106 482213031603 1N4006 2145 4822126 13692 47pF 1 63V 2161 4822126 14585 100nF 10 50V 6107 482213031603 1N4006 2146 4822126 14247 0603 50V 1N5 COL R 2201 4822126 14585 100nF 10 SOV 6129 532213080122 BZX84 C24 2147 4822 126 13482 470nF 80 20 16V 2202 5322 122 32654 63V 22nF PM10 R 6130 4822 130 83649 199355 2148 4822 124 22726 4 7uF 35V 2210 2020 012 93728 Br YK 10V S 2200uF PM20 de Mec 130 42488 BYRD 2149 3198016 36810 0603 25V 680P COL R 2213 482212441584 100uF 20 10V 6141 482213010656 UDZ20B a s i ie pene bd 2220 4822 124 40849 330uF 20 16V 6150 482213011148 UDZ4 7B 2152 4822126 14305 100nF 10 16V 0603 2221 4822126 13751 47nF 10 63V 6201 932210743685 UDZ22B 2153 482212233777 47pF 5 63V 2222 4822 124 42234 100uF 20 6 3V 6202 932210264685 DIO REG SM UDZ2 7B 2154 482212481286 47uF 20 16V 2230 482212481144 1000uF 16V RHMO R 2155 4822126 14585 100nF 1096 50V
12. 0794 220pF 5 63V 3112 482205311229 220 5 2W 7254 532213060159 BC846B 2174 4822 126 14494 22nF 10 25V 0603 3113 4822 051 10102 1k 2 0 25W 7260 822267506290 VOLT REG BA12T ROHM 2175 482212481286 47uF 20 16V 3117A 4822 053 21684 680k 596 0 5W 2176 4822 122 33777 47pF 5 63V Electrical diagrams and PWB s consragen 7 C CDR MAIN BOARD CIRCUIT DIAGRAM 7 POWER PART TESTPOINTS 1 2 3 4 5 5556 BLM2T eo iD Q P12VKILL gt 13 14 Feo1 11 8V BAS216 BC857B 7561 TO DISPLAY BOARD POWER_UP 3538 10K P12VKILL F815 VDC2 7520 STD17N05 0 7V 5K6 F811 gt KILL 3 8V during normal operation KILL OUT F822 F823 5500 5502 es H POWER UP GND CASE pe 12VA 12VPWR Y p12VPWR Is 12VPWR 12VCP Y 7521 A MC34072 1 3546 BC847B F491 e F836 100R 5V e 5 2V 7522 7558 100K F818 BC857B L78M09 F832 9SRVPWR 3567 22K F825 7549 BC847B F824 2561 00n 6500 BAV70W 27 5V F499 5554 F498 3550 F497 e 47u 100R BC857B POWER_UP KILL_OUT Ds e 27 4V Y 7548 7521 B BC847B 1 AN 6502 MC34072 4 5V BZX284 C22 7 3549 F494 e e F834 100R 100 4 6V m 4 6v BC857B F837 e 5 2V 7556 MC79LO5ABD 2 1 F829 PB CDRW
13. 10 Overvoltage protection circuit This circuit consist of D6114 C2114 R3115and R3116 GB62 EM CDR779 Faultfinding Guide When the regulation circuit is interrupted due to an error in Secondary rectifier smoothing circuit the control loop the regulated output voltage will increase There are 5 rectifier smoothing circuits on the secondary overvoltage This overvoltage is sensed on the primary side Each voltage depends on the number of windings of the winding 7 9 When an overvoltage longer than 2 0us is transformer detected the output is disabled until Vcc is removed and then The 8V supply is regulated by voltage regulator 7249 re applied The power supply will come in a hiccup mode as long as the error in the control loop is present On off circuit In off mode pin 1 and pin 2 of connector 0206 are connected The high voltage 8V 12V over opto coupler 7200 forces this one to conduct IC 7110 is switched off 8 2 8 Troubleshooting PSU CDR3 ECO Faultfinding diagram TROUBLE SHOOTING POWER SUPPLY i Check DC voltages OK 5V 12V 8V VFTD 38V VDC1 VDC2 3VS NOK Disconnect the power supply from the MAIN Board Connect a dummy load resistor 6 8 ohm 10W min 5W on the 5V and L power supply OK power supply OK Check DC voltages OK check main board 5V 12V 8V VFTD 38V VDC1 VDC2 3V8 front board modem board check the fault voltage path check 6210 2210 2253 5210
14. 2141 E3 2142 E4 2150 F2 2161 G5 2201 E7 2202 F7 2210 A8 2213 A9 2220 D8 2221 E7 2222 D10 2230 B8 2231 B9 2232 B9 2234 B9 2240 C8 2242 C9 2243 C9 2250 D8 2252 C11 2253 A8 2260 A10 3102 F5 3103 E5 3104 E4 3105 F4 3106 F4 3109 G4 3110 D5 3111 D4 3112 D6 3113 E5 3117 A3 3119 B3 3120 A2 3122 A4 3123 B4 3124 A4 3125 C5 3126 C6 3127 C6 3128 C6 3129 D4 3134 C4 3141 E3 3142 E2 3150 F2 3151 F3 3201 E7 3202 F8 3203 F7 3204 F8 3205 F8 3206 G8 3207 F7 3208 F7 3220 D11 3221 E10 3222 D10 3223 E9 3224 D9 3225 C9 3229 C11 3230 B8 3232 C11 3233 D11 3234 D10 3235 B10 3236 C11 5120 A4 5121 A4 5125 B6 5130 D6 5131 A6 5210 A9 5220 D11 5225 D9 5226 E9 5230 B10 5240 C9 5250 C11 5255 C7 6100 A4 6101 A5 6102 A5 6106 B4 6107 C4 6129 D4 6130 D5 6132 D6 6133 E5 6141 E2 6150 F3 6201 C10 6202 D10 6210 A8 6220 D8 6230 B8 6240 C8 6250 C8 7110 E5 7125 B6 7131 F6 7141 F3 7150 F3 7201 G7 7249 B8 7251 C10 7252 C10 7253 D9 7254 D9 7260 B9 9122 A4 F100 A2 F101 A2 F102 B2 F103 B2 F104 A5 F105 A6 F106 A6 F107 B6 F108 B4 F109 D3 F110 E5 F111 B6 F112 B6 F121 D2 F122 F3 F125 D4 F201 A9 F202 A9 F203 B10 F204 B10 F205 C9 F206 C9 F207 C11 F208 C12 F209 D11 F210 D11 F211 E10 F212 E11 F213 B12 F214 B12 F215 E7 F216 F7 F217 G7 F218 G7 F219 G7 F220 B11 F221 B11 F222 B11 F223 A9 F224 A10 F230 A10 EN LEA CDR779 Block diagrams Circuit diagrams and PWB s Layout PSU
15. 2294 A822 124 81151 22uF450V 6210 482213083865 SB360 2156 5322 12411919 47uF 20 6 3V 2240 482212440196 220uF 20 16V 6220 482213042488 BYD33D 2157 4822126 14305 100nF 10 16V 0603 2242 482212441584 100uF 20 10V 6230 4822130 11415 BYV28 400 20 2158 482212233777 47pF 5 63V 2250 4822 124 40255 100F 20 63V 6240 482213042606 BYD33J 2159 319801734730 0603 16V 47nF COL 2252 4822 12440248 10uF 20 63V 6250 482213032896 BYD33M 2160 4822126 14494 22nF 10 25V 0603 2253 2020558 90449 DC DE F 1KV 4N7 P8020 A 2161 5322 124 11919 47uF 20 6 3V 2260 482212233177 10nF 20 50V QE 2162 482212231765 100pF 2 63V Eus 2163 4822126 14549 33nF 16V O603 Tr 7110 932214588682 UC3842A 2164 4822126 14508 180pF 596 50V 0603 7195 482213011417 STP3NB60FP 2165 4822 122 33777 47pF 5 63V 3102 482211710354 22k 1 0 1W 71314 4822 13091451 CQY80NG 2166 3198017 34730 0603 16V 47nF COL 3103 4822051 20339 332 5 0 1W 7141 482213060373 BC856B 2167 4822126 14585 100nF 10 50V 3104 482211683933 15k 1 0 1W 7150 532213060159 BC846B 2168 4822126 13883 220pF 5 50V 3105 4822116 83933 15k 1 0 1W 7201 482220981397 TL431CLPST 2169 5322126 10794 220pF 5 63V 3106 4822 051 10102 1k 296 0 25W 7249 482220982112 MC7908CT 2170 5322126 10794 220pF 5 63V 3109 4822 051 10102 1k 2 0 25W 7251 482213041344 BC337 40 2171 5322126 10794 220pF 5 63V 3110 4822050 21003 10k 1 0 6W 7252 482213060373 BC856B 2172 5322126 10794 220pF 5 63V 3111 4822116 52199 680 5 0 5W 7253 482213041246 BC327 25 2173 5322126 1
16. 5 BC857B 100K F818 F832 3567 22K F825 7549 BC847B 8VA gt F826 L A 8V bail 2561 00n 6500 BAV70W P12V 3550 F497 e BC857B 2552 Fin 15K 3548 47K 5V6 F835 12VCP Y 7521 B MC34072 8 12VCP 7548 2507 i BC847B 4 5V 4 7 3549 F494 9 e F834 100R F499 47u 100R 27 4V 6502 BZX284 C22 A 10 11 2558 100u m D a 7556 c FS30V 2505 2506 10u 12 3013 13 MC79L05ABD 2 1 OUT 14 1542 A4 1543 B4 2500 E2 2501 F1 2502 F2 2504 A12 2505 H12 2506 H12 2507 H10 2508 l8 2509 I8 2535 B5 2536 B4 2537 B5 2541 D5 2543 B4 2544 B4 2546 C7 2547 F6 2548 D5 2550 H8 2551 G4 2552 H4 2553 H8 2555 F12 2556 G13 2557 F14 2558 F12 2561 F11 2562 H8 2563 H8 2565 D6 2568 A5 2571 D3 2572 E2 2574 E8 2575 E9 2576 D6 2577 F2 2910 E7 3013 H13 3531 C12 3532 C12 3533 A13 3536 C6 3537 C6 3538 C4 3539 D5 3540 E10 3541 F6 3542 E6 3544 F4 3545 G4 3546 H4 3547 H5 3548 H6 354917 3550 H10 3551 16 3552 F5 3553 l6 3554 E5 3555 F5 3556 E4 3557 F4 3559 B12 3560 B13 3562 B13 3563 B14 3566 E10 3567 E11 3570 A12 3571 A11 5500 D2 5501 E2 5502 E2 5503 E2 5541 D4 5542 D4 5543 B3 5544 B3 5546 C7 5551 F11 5554 H10 5555 D6 5556 A5 5557 D6 5709 F3 6500 G11 6501 G9
17. 5 2550 H8 2551 G4 2552 H4 2553 H8 2555 F12 2556 G13 2557 F14 2558 F12 2561 F11 2562 H8 2563 H8 2565 D6 2568 A5 2571 D3 2572 E2 2574 E8 2575 E9 2577 F2 3013 H13 3531 C12 3532 C12 3533 A13 3536 C6 3537 C6 3538 C4 3539 D5 3540 E10 3541 F6 3542 E6 3544 F4 3545 G4 3546 G4 3547 H5 3548 H6 3549 I7 3550 H10 3551 16 3552 F5 3553 16 3554 E5 3555 E5 3556 E4 3557 F4 3559 B12 3560 B14 3562 B13 3566 E10 3567 E11 3570 A12 5500 D2 5501 E2 5502 E2 5503 E2 5541 D4 5542 D4 5543 B3 5544 B3 5546 C7 5551 F11 5554 H10 5555 D6 5556 A5 5709 F3 6500 G11 6501 G9 6502 111 6553 A11 6554 H9 7520 C6 7521 A G4 7521 B l6 7522 H5 7523 C6 7524 C5 7525 E11 7526 G5 7527 E5 7528 F5 7529 l8 7535 A4 7548 l8 7549 F11 7556 F13 7558 E8 7560 B12 7561 B14 7562 C13 7563 C12 F491 G5 F492 H9 F493 I7 F494 l8 F495 I9 F496 H8 F497 H11 F498 H10 F499 H9 F800 A6 F801 A12 F802 A6 F803 B13 F804 B14 F805 B6 F806 C8 F807 C8 F808 B13 F809 B12 F810 C11 F811 C12 F812 H3 F813 C5 F814 C5 F815 D2 F816 D2 F817 D2 F818 E10 F819 H12 F820 D1 F821 D7 F822 D2 F823 D2 F824 F11 F825 F11 F826 F12 F827 E2 F828 E2 F829 F14 F830 F4 F831 F3 F832 E11 F834 I7 F835 l6 F836 H4 F837 I7 F838 G4 F839 E6 F840 E6 F841 E9 F842 E5 F843 F7 F844 E3 F845 F4 F846 H5 Electrical diagrams and PWB s LE EHE CDR MAIN BOARD CIRCUIT DIAGRAM 7 POWER PART TESTPOINTS 2 6 10 11 12 13
18. 8 2 8 2 1 8 2 2 8 2 3 Circuit description of the current mode power supply Blockdiagram Rectifier Lightning Protection MAINS Amplifier CONTROL Function description MOSFET 7125 is used as a power switch controlled by the controller IC 7110 When the switch is closed energy is transferred from mains to the transformer This energy is supplied to the load when the switch is opened Through control of the switched on time the energy transferred in each cycle is regulated so that the output voltages are independent of load or input voltage variations The controlling device UC3842 is an integrated pulse width modulator A clock signal initiates power pulses at a fixed frequency The termination of each output pulse occurs when a feedback signal of the inductor current reaches a threshold Faultfinding Guide CDR779 E CEJ 6210 5131 6230 12V 6240 6250 VFTD 6220 VDC2 VDC1 5V 7131 ov 7201 REGULATION CL 06532151_018 eps 271100 Figure 8 10 7 vu O ev sv 8 SR REF O Vief tev 5 Vv eNp O T 25V BIAS q O 4 6 Rit O osc 21 O ourPuT 25V K ERROR AMP I SENSE COMP 2 le d Vib gt to R Rei gt comp O LATCH 3 Isense O set by the error signal In this way the error signal actually controls the peak inductor current on cycle by cycle basis Description of
19. 844 1 F845 I F846 I Electrical diagrams and PWB s n z o tc LL 1 2 TO DISPLAY BOARD F815 VDC2 F816 VFTD s gz Wo 4 F820 F822 F823 3 POWER PART 4 5 ET A LIEGE 6 CDR MAIN BOARD CIRCUIT DIAGRAM 7 POWER PART TESTPOINTS GND CASE F827 GND_CASE 3104 123 4228 7 POWER UP KILL OUT 5502 _ P12VKILL POWER UP 3538 10K STD1 ZN05 F821 ge 12VA F840 p12VPWR 12VPWR Y 12VCP 7521 A MC34072 1 3546 7526 BC847B F491 F836 100R 5V 7522 BC857B 15 2V P12VKILL B 11 12 13 14 BAS216 reo 11 8V BV during normal 4operation 8VA KILL OUT 12VPWR Y 100K F818 9SRVPWR 7525 BC857B F832 3567 22K F825 7549 BC847B 23 2V Sivo 5554 F498 3550 F497 v ad 2561 I 00n P12V a 75218 4 5 MC34072 7 38549 o 47u 100R 27 4V y 7548 BC847B LJ F834 100R F494 e 7529 BC857B 2505 6502 aX BZX284 C22 10u 7556 MC79LO5ABD 2 1 CL06532018_052 eps 290200 1500 D1 1541 D4 1542 A4 1543 B4 2500 E2 2501 F1 2502 F2 2504 A12 2505 H12 2506 H12 2507 H10 2508 l8 2509 l8 2535 B5 2536 B4 2537 B5 2541 D5 2543 B4 2544 B4 2546 C7 2547 F6 2548 D
20. W 1206 2114 4822 126 14585 100nF 10 50V Miscellaneous 4xxx 4822 05120008 02 5 0 25W 0805 2115 4822 126 14585 100nF 10 50V 2116 482212441796 22uF 20 16V 0025 4822 492 63524 FIX TRANSISTOR Sane 2117 4822 126 13561 220nF 10 16V 0060 4822 492 63524 FIX TRANSISTOR 2118 4822126 14585 100nF 10 50V 0101A 4822 265 31015 HSC0528 5120 482215711846 uH 1922P4 2119 4822126 14585 100nF 10 50V 1120A 4822 070 32002 218002 2A 5125 482215711411 100mHz 2120 482212441796 22uF 20 16V 1121 4822 265 11253 FUSE HOLDER 2P 5130 482215751312 68uH 2121 4822126 14585 100nF 10 50V 5131A 3128 13838950 SM TRANSFORMER 2122 4822 126 12104 12nF 5 50V u CT283D3 2123 5322 122 31863 63V 330pF PM5 5210 4822 157 11722 6 8uH 20 7 7X9 5 2124 4822 126 14585 100nF 10 50V 2102 223886115182 50V 1N8 PM5 R 5220 4822 157 51462 10uH 10 4X9 8MM 2125 482212481286 47uF 20 16V Biel gas 12531847 IPE 1063Y LALO4T100K 2126 532212234098 10nF 10 63V 2127 5322 122 31863 63V 330pF PM5 2106 5322 126 10223 4 7nF 10 63V em 32 bo 2510 p 2128 4822 124 80483 47uF Een eV zi pe Voc iso PME LULA 5230 4822 15750963 2 2uH 2130 4822126 14305 100nF 10 16V 0603 2120A 4822 12110697 220nF 20 275V 5240 4822 15751462 10uH 10 4X9 8MM PIII p eee E08 100nF 107s SON a 2132 482212480483 47uF 20 6 3V 2121 822267505480 EL 47uF 400V YK KC LALO4T100K k RUBYCOnF 5250 482215751462 10uH 10 4X9 8MM 2133 4822 126 13482 470nF So 16V 2127 482212250116 470pF 10 1KV LALO4T100K 2134 4822 126 14305 100nF 10 16V
21. ams CH1 2 CH2 PM3394B CH3 2V ALT MTB5 00us 0 90dv ch1 ch1 NY ch3 ch2 ch1 Drain voltage ch2 Drain current ch3 Gate voltage CH1 1 PM3394B CH3 50mV ALT MTB5 00us 0 90dv ch1 ci E MA TA N Ww ET LJ Ler ae per 3 T ch1 Drain voltage ch2 Oscillator voltage 1 CH1 1 PM3394B CH3 20mV ALT MTB5 00us 0 90dv ch1 eht Na li i 1 Ws ch3 f j Hi v J CL 06532151_022 eps 301100 ch1 Drain voltage ch3 Sense voltage Figure 8 14 Faultfinding Guide CDR779 Em LIB 8 2 7 Circuit description Input circuit The input circuit consists of a lightning protection circuit and an EMI filter The lightning protection comprises R3120 gasarrestor 1125 and R3124 The EMI filter is formed by C2120 L5120 C2125 and R3124 It prevents inflow of noise into from the mains Primary rectifier smoothing circuit The AC input is rectified by rectifier bridge 6102 and smoothed into C2121 The voltage over C2121 is approximately 300V It can vary from 100V to 390V Start circuit and Vcc supply This circuit is formed by R3123 R3134 C2129 D6129 R3129 R3111 C2133 and C2111 When the power plug is connected to the mains voltag
22. e the stabilised voltage over D6129 24V will charge C2133 via R3129 When the voltage reaches 14 5V across C2111 the control circuit of IC7110 is turned on and the regulation starts During regulation Vcc of IC7110 will be supplied by the rectified voltage from winding 7 9 via L5132 D6132 and C2133 Control circuit The control circuit exists of IC7110 C2102 C2104 C2107 C2109 C2110 R3102 R3103 R3104 R3107 R3108 R3109 and R3110 C2102 and R3110 define the frequency of the oscillator Power switch circuit This circuit comprises MOSFET 7125 Rsense 3126 3127 and 3128 R3125 C2127 L5125 R3112 and R3113 R3125 is a pull down resistor to remove static charges from the gate of the MOSFET Regulation circuit The regulation circuit comprises opto coupler 7200 which isolates the error signal from the control IC on the primary side and a reference component 7201 The TL431 7201 can be represented by two components avery stable and accurate reference diode ahigh gain amplifier 2 5V A CL 06532151 023 eps 271100 Figure 8 15 TL431 will conduct from cathode to anode when the reference is higher than the internal reference voltage of about 2 5V If the reference voltage is lower the cathode current is almost zero The cathode current flows through the LED of the opto coupler The collector current of the opto coupler flows through R3106 producing an error voltage connected to voltage feedback pin 14 of IC71
23. e output voltage of the power supply is in regulation t4 overload When the output is shortened the supply voltage of the circuit will decrease and after some time drop below the lower threshold voltage At that moment the output will be disabled and the process of charging the Vcc capacitor starts again If the output is still shorted at the next t2 phase the complete start and stop sequence will repeat The power supply comes in a hiccup mode Figure C Start up sequence CL 06532151 020 eps 271100 Figure 8 12 Regulation Figure 4 shows the most relevant signals during the regulation phase of the power supply The oscillator voltage ramps up and down between V1 and V2 The voltage at the current sense terminal is compared every cycle with the output of the error amplifier Vcomp The output is switched off when the current sense level exceeds the level at the output of the error amplifier TimeON phase A drain current will flow from the positive supply at pin 1 through the transformer s primary winding the MOSFET and Rsense to ground As the positive voltage at pin 1 of the transformer is constant the current will increase linearly and create a ramp dependent on the mains voltage and the inductance of the primary winding A certain amount of energy is stored in the transformer in the form of a magnetic field The polarity of the voltages at the secundary windings is such that the diodes are non conducting TimeDIODE p
24. hase When the MOSFET is switched off energy is no longer supplied to the tranformer The inductance of the tranformer now tries to maintain the current which has been flowing through it at a constant level The polarity of the voltage from the transformer therefore becomes reversed This results in a current flow through the tranformer s secondary winding via the diodes electrolytic capacitors and the load This current is also ramp shaped but decreasing TimeDEAD phase when the stored energy has been supplied to the load the voltage from the secondary windings falls below the output voltage held constant by the electrolytic capacitors plus the threshold voltage of the diodes The current in the secondary winding stops flowing Atthis point the drain voltage of the MOSFET is not yet zero because C2609 between drain and source contains a certain charge This charge will start a sine shaped ringing together with the transformer s self induction The oscillator will start a next cyclus which consists of the described three phases The time of the different phases depends on the mains voltage and the load TimeDEAD is maximum at an input of 400VDC and minimum load it will be zero at an input of 100VDC and overload V2 Vosc V1 0 Vcomp Vsense Vgate Vdrain Idrain Idiodes Ton Tdiode Tdead e CL 06532151 021 eps 271100 Figure 8 13 8 2 6 Oscillograms Oscillogr
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