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Line-Xtension Service Manual

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2. 1M69 D2 AGND TC Electronic A S Designer DESIGNER 7 10 2006 15 56 Title Module title TITLE MODULE TITLE Number Revision Previous page NUMBER VER AAA XX Date Filename Page of FEEDBACK 1 4 AGND AGND AGND 200 1500 90 102 Taron 203 4508 025 BAS216 ji L16 N A dup e E 3 D24 R97 BASS21 5 99 IRFB4233 TP401470K 022 09 184 R43 BAS216 1060 LIN H DS HIN H BAS216 3 3 TP385 R271 95 4 4233 42 GND BSR14 R10 470K TP414 R94 6385 TP400470K D 72 C20 sog nu mom 4705 9215 AGND M3 D AR m DR04006 0B M4 AN
3. 400v li gt 105 oy m E Gnd Resonant 3 23 105 controller controller ay Soft ZO 13 5v start gt 6 LV d 105v 8 1 PwrGood 105v Eu Regulation PFC ON 5 Regulation control ang PowerGood 477 Mains ok On Mains 12v pa ey n detector 4 S dece PwrGood Aux PEE Mains dropout PowerGood 12v_Aux gt 12 400 gt 12v lt 53v SOPS Startup 3 gt 53v Ref converter gt 9v Ref DF 22v Regulation control As Soft Start PFC When the mains cord is plugged into the wall the following will happen The rectified mains will through 15 start to charge the capacitor bank C22 C25 The soft start circuitry will make the capacitor tank charge slowly with low inrush current R33 is used as a current sense resistor and Q7 and Q4 1 used to slow down this event The voltage over the capacitor tank will rise slowly and after about 1 2 seconds it will have completed it s inrush cycle and R33 is bypassed via Q5 thus shorting the entire soft start circuitry The node that in the schematics is named 400V will be Vin 1 41 for 220v Mains it will be 311V for 110v Mains it will be 155v The circuitry will remain in this sta
4. J1 A10D Schematics Partly 34 PIN VERTICAL CONNECTOR 44 21 5 lt gt 33 2 C67 1NO 1 1 0 TEIG 6 168 67 TP42 TP422 CLIPA ENA 1 VOUTA 29 VINA lt gt REND e TP395 VINA 166 1 27 22 2 12 2 tof 3 1N 150 150 1N 12 SZ 12 7 4 PE 1 5 9 4289256 2 te 7 ENB 1N0 8 CLIPB 19 11 72
5. 2 e TP94 VRMS VREF GND AUX_GND R49 TP79 15K 12 INO NOT_USED NOT_USED 69 Designer DESIGNER TC Electronic A S Title Module title TITLE MODULE TITLE Number Previous page NUMBER Date Page of 8 8 2006 16 15 1A AICOAb Circuit description Power supplies power up down Stand by supply The power supply in the unit has a standby supply which is always on when the mains cord is plugged in Once this converter has enough supply to generate good output power it will generate PowerGood Aux which will go high Before this it can only be powered through NomadLink NLIPs When a Voltage is present on NomadLink it will go through D407 and if the standby supply is off it will go through Q410 When the standby supply is on it s PowerGood will through 0422 turn off 0410 and feed 12v from the standby supply through D408 to the same node The existence of Nomadlink power is sensed through R475 and R472 and when this is high it will activate the Com Led by pulling the ComCt high This will turn on Q416 and turn off Q411 thus leading the current through the Nomadlink diode which is connected between and 0412 amp Q4
6. 10 11 5 7 TP8 96 7 5 4 1 0 me A e e lt 33078 195 1 190 162 68 R182 120P 2 Jj 5 E E AGND S NC e R196 1 203 e 68 CF1 CF2 AGND C191 15K0 194 R193 15K0 TP207 TP204 AGND 163 10 R177 KO e R201 e e TP208 330K TP36 188 185 19 R185 R169 lt a VIN A 12V 1N5 150P ND 08056 1 5 2189 8056 165 D 7 5 3016 4
7. 12v 2 Tetiune a cs IS 3 i 1 Eu rd cal CPse cepe cene 29 BEE d ap CPIE 7 sepe 18 ua3 Papa EMI 3 imiu nhn EU TA en LT 125113 T t ta wren S Lu Site 7 ASAT Can 4b eb 421 i _ C214 Chapa 7 qo edlnE H E Lada b gg tT nz i 5 a Wer T P4HCTLES 5014 E vi 98 m En 4 Th D Ho E NE TT EDT 48512 n Sd V x x SN Lee n r Futsal TE 2 9 qp niote gt _ E Cer meal TET 4 P415 a e eil db esce at a it e P414 up Q2 eee 40 2065 LV Leer 1 2 dz a
8. IN POWERGAIN IN REE PROTECT TEMP 5 DR04025 A PROTECT AGND RE IN POWERGAIN IN e REF WM FEEDBACK Designer sme TC Electronic A S Title Module title ul TITLE MODULE TITLE 2 Number Revision Previous page NUMBER VER AAA Date Filename Page of 4 5 2006 16 09 AMP 14
9. fa LE TetPnt ib Pae TA 2 CHECKED REPLACES REPLACED BY 4 re Ay AICO4b 1 0 li Br iil E 5 SCL ah qd GPT p m n aE CS a 14 Analog Input Control and Output C teat DRAWING NO Network in Network cut KUNGSBACKA SWEDEN 4 channels type b E ICO4b87 108K VRI eden gin Lfdut 2 EN eeu sed Bdg ut 41 ume 10k 125H1 189 R31 3 a eeu 58 lt i x 1T WTLSC4 Re gt UC Lip TstPnte 7 gt TL 11 TPR 4 i gt 54 467 125 1 gt Lim 1 amp 5 111850 4n 63V 158R 125W1 in in T 472 125415 C23 S E t 2 LuHD9 4 17 5 a i LUA 24 gt a n 4K7 1258 1X ME 1 see below R14 4KT gere UF hut Ga F Rig a XM x 1 DIG 4 ni 5 5 3832 1 4 uA 5 T De 5 3K16 125241 F 1564 4 D eed 2 iE gt Adut 14 21 WT ESI 9521 E wwe Y S 218 2A PES a Ge 125a 47K 12541 05 27 5 ce 57 s 189 1M8 12541 ena 125 1 1 54
10. 5 419 gt 1005 PurOnCt 1n 584 in 504 R441 100K 12541 FrPanEn eR 125W1 UPCB 931292 KUNGSBACKA SWEDEN UPcB 1 Micro Processor unit tupeB SPSMR Circuit description The SPSMR board is a very simple board made up just to signal the power switch states to the input board It is supplied with 9v from the input board When the power switch is set to on the 9v is connected to the PowerOn Off signal thus signals to the input board that this switch is set to on The remote switch is connected after the power switch and can thus only be monitored when power 18 set to on When the power switch 18 set to on and the remote switch 1 set to remote the 49v is connected to the RemoteOn Off signal thus telling the controller that the remote switch 15 set to remote When 9v is present at the RemoteOn Off signal the remote LED D1 will be lit Below truth table will give the signal value for each switch PowerOn Otff Remote On Off om Rmo On 9v 0v ___ SPSMR schematics Off 250 e On PowerOn Off CPDe CPe Man RK1 1PC 6A15xe1 51 RemoteOn O0f f CPDe CP3 GND CPDe CP4 1 7 146413471 11 Front Panel The front panel is controlled from the controller on the input board All diodes except for one the NomadLink LED works in the
11. ME R122 22K TP190 M393 161 R134 mw INO 9 4 167 O R159 10K 8 LM393D 155 7 196 193 10K re K 026 847 GND Electronic A S Title TITLE Number NUMBER Date 8 1 2006 13 02 160 GND 149 0 034 BCRA7 Module title MODULE TITLE Revision VER AAA Filename RESONANCE 4 1 Designer DESIGNER Previous page Page XX 1A D5 LI MA OH ETT T 22 4 24 C25 5600 5600 5600 y lt gt R30 R32 R31 K 06 RES_GND 85 3K 33K 33K 91 OT USED USED Q4 SOPS STARTUP FDH44N50 BCP69 C13 Q8 Q TNO TP83 BC847 C16 NOT USED 1 SUD50N02 06P 100N GND n 63 R58 59 R137 IC3 1 ORO GND OUT PKLIM 0638548 5 4 24 CAOUT E i R40 ISENSE eip R39 M_OUT PWR ON CTRL 7 VSENS 6 VAOUT ENA 17
12. 15 14 187 189 tm L1 1N5 R178 AGND R3 cie 28 REF TP33 A 12V 10P 1 29851 5 5 0 e e 5 VOUT IN 1 1232 OFF 260 C12 22 183 BYPASS 4 C168 C169 C171 C4 100N 100N GND AGND R12 5 DO 10K0 TP34 yP R1 BAS216 1M69 VCLIP E IC2 R11 TL082 10K0
13. 13 AG 5 n 33n 1884 gea 1 iia 5 Clip ESHIL Curpres 2177 Senton a gl gt sen 13 5 98 UDRect fi uoRect 22K 12541x BCB47C 8 E 5 x PDTCIBAET 18 PDTCT44ET 1 RN OE me e Ua E E DIG Mute lt ii C 4 3 a u a mie DIG R47 011 bs 47K 125415 x 106 x DC pI DIG 5 z 184 cu 188n 5 n LM339D o eL V eu e 18v M E78 5 1 5 4 12541 2 DIO tLaseDs 1 3 og 215 T ti i if 2 2141 R5 2 2 a TstPntg 88599 i B 025 au 15 12541 ou BAYS d V 16V x Nt 18K 125H1X 18K 125H1X DI HO LAK 125 15 n rau 5 REE R73 Miser 2210 ES 847 al 4 ve E DIC _ 1 EB c29 12541 184 BBu 189 274 18K 125H1 5 5 3 547 UDRect gt 14 12501 d 125515 1 n 35 gt 4 1 A S b Enn kes m 3 1 A 31 LKB 195M1 hor SC Latch En Latch viru n3 284 ues
14. L T an T In A db Pal dur CP3a1 adut D iin foe BH Rin 1 2 mu 2 io x E 2 _ 5 1 4413 LL 4 Lave tl 4 287 P LG L La Pare r E q Su dalami a Me Be d a be ca m 128 arem ee below yf TO Sa eS 2 aout d CU Tet coer pev L xBeaben La Torpi LG db Lew rie T 5 ISL d 4 a 4 iu Saw 3 15 pag DEK 127419 5 18 12301 BESAFE C gt if p 42 Clin Bear n amp 4 C qb u nuin y ISSHTE 21 188 SETI 4 518 Taa pa 9 25 47 qp Bagnzse 4 gt Tunc qe sei qo uim n Dc 4 PESGI LASY 1
15. ni 1 12301 ae 188m 589 18V BAVOS n 14 mem ps DIC 1 8 di DG c p Curpres d x Isen eb Bh oda 028 5 21 c z 4 i m n ul el 1251415 Plum Qec E 13 x Ree Lae 12541 gt I en T E NS be 5 EAT 5 gt gt gt gt 184 V in n oF gt a 4 EnA E i Li Lip SC detector SC DIG 18 184 18U 0 15 18V DRAWN CHECKED REPLACES REPLACED BY 1 31 12 KUNGSBACKA SWEDEN circuit tupe 1 Analog control and monitor DATE PAGE DRAWING NO 103 189 5532 oe NESS32D U6 R92 i 3 4K53 125W1 L6 R59 10K 125 1 AGL E 1 lt 1 4 10 3 125 1 lu 16 032 T 10K 125W1 MMBF 4392 LfIn a L1xBEADAMIOXS ox 125 1 10K 125W1 C19 17 100U 22p 100U AG R45 R46 10K 1eSW1 180K 125W1 MMBF4392 an 218 22 BAWS6 D DS 189 NESS32D R192 C134 4 53 125 1 LfIn B lt Q132 r MMBF 4392 LfIn B lt 10K 125W1 C119 190 ep 190 R146 180K 12541 lu 169 183859320 NESS32D 5 5 3 1 2 L1 ies 474 35V 47 35V x D Cle 1
16. 2k Lint 338K 129 1 cm am P aione eo caf Peps Leute ap HR TTE M ecese LPs Kanes on i 1 PAARL Farce P er q Biti A P adatt C 3 1 E E dk TIE 267 AF oe IM gg al P Law bc E i 7 nc OM 2443 4 4 CPF rope Louin d 11 WurGood 4150 0 1 E LEO 1 Sn 1 0421 Dd mast Parte i T s Front e 4 IM ac if AP values Oe 1 _ SS av ruteni tip ras us Limb ETE t ay na lt 1 FstPet2 1 do LEY T H E Louth 104 5 4 189 3 qb ie Adin 0 Hinr 59 EaP aens A 15 Ure t 188 125415 al gt gt wc GPE La 2482 foe ne we SPO MGIC ieu 41 Fle i iE 3 1 P imde
17. Pheer PurGnod 5 PUE apr ap e T gi rens _ RE wr Cod nil Che Cie TR Lb 2 gt T We Leek eS 345 POP Tea 4 Fan ub oF ori 4 prise ah 3 4 cene boride Reate 0 183019 En Some CER E _ ru c E 4 awe pe E qe aL GPIO 2 1 Tu 8 h 2 45 m m 54 d fare ab 1082 091241 lu 1814 du LEW 48 188 125818 cwn ALAR 4 P gt LAE en EB Dhesa 3 F 1 jme E 1 out foi 6481 5 Code dp Dew uu 5 LA LC Pp rin im 2 PL in qi Laut iu i T nz d 5443 4 Rada T ue e a x2 cpna 1 4 Ae 5 Cea m e 18 448 Laat
18. 25 a R112 470K RES BC857 Q22 10K t C67 INO 9 RES GND NOT pUSED 3R3 TP44 Q19 n 4 039 5216 220 KV05318 169 185 e C52 47N RES GND Q24 BC847 156 7 119 470K 016 R98 100K 4 1 109 6 151 1 1 5216 41 100N 034 035 R133 120R RES GND SZUR BAS216 47 023 22N BCR847 033 5216 RES GND TP136 KV05320 45 180 D2 SS e 024 5535 77 220017 025 5534 60 R105 390K 166 R103 390K 106 74 INO 100N RES GND 146 042 A 12V A 100 4K7 lt gt e R144 143 GND POWERGOOD 2KW IMO 3 2 8 1 7 021 TL431D p R123 22K
19. alio Rr 33 Enable Disaple ord 2 34 E 34 35 DC POI HO so 35 29 35 TE S A MIT 35 tre IEA 35 22 M M EM 37 2010 9 5 Partby ea a 38 SP20F Circuit description Functional overview The power supply SP20F is used C Series line extension amplifiers It incorporates Universal voltage input 90 265 VAC Power Factor Correction PFC Soft start Fast mains unplugged detector A highly efficient isolated resonant converter for the high power outputs A standby supply also used for lower voltages Block diagram SP20F block diagram Y
20. 2 DR04006 0B MI M2 N A aoe S uo com d Designer DESIGNER TC Electronic A S Title Module title TITLE MODULE TITLE Number Revision Previous page NUMBER VER AAA XX Date Filename Page o 7 7 2006 13 26 POWERGAIN 1A 161 160 e 680N C113 DR 4001 0D 111111 anpi GND2 1 0 AGND AGND M30 M29 N A N A M8 DANNA DR04006 0B M9 DR04006 0B 5 Designer TC Electronic A S Title Module title TITLE MODULE TITLE Number Revision Previous page NUMBER VER AAA XX Date Filename Page o 7 7 2006 13 26 FILTER 1A 06015585 028 17 304 C213 TP118 120P 540 04 R251 D36 BC817DPN 04 5 Designer TC Electronic A S Title Module title TITLE MODULE TITLE Number Revision Previous page NUMBER VER AAA Date Filename Page of 8 1 2006 9 25 PROTECT 1A
21. 857 BCBSTC 5 x gt C HP Filter x 50 lt gt _ 584 ra F565 A 2551 gt 18V T 18K 12501 gt FIK 125041 2 mud 33K 1285H1 Lmr DG R548 198 185815 pew Pees LABGRUPPEN DRAWING KUNGSBACKA SWEDEN ISP Port JTAG Port see below 404 405 C TstPnt2 2 gt E 1 R SW 1 1 TstPnte 3 4 5 lt gt 5Up J P42 2444 gt gt 6 5 E E gelled A 2 16 7 TstPnte TP41 gt 1060 Adin A D ES gt 10 1 E H E gt 1062 1 15 11112 H gt 1005 100 50V CADCE gt AB aX EINEN gt GPILevel 12 12 102 u40 M 10K 125 1 XCK T0 BO a S PurOn 0f f 504 5 lt n gt Rem0n Man 1 2 n aa F S X I gt Mosi 1 0 1eSW1x 4 2 1 R419 1 0 125 1 NML N R BL D TCK FpEn t gt TNS D TDO ELE TDI m _ gt CsE H 10K 12581 C481 58 gt Rx E gt x 8 14 1 gt 1060 PwrGood1 5B 5 555 ia 1 132 Inti Sy gt 1004 ComCt s 8 e 509
22. 105 It is important that this square reaches the positive and negative rail otherwise the transistors are not completely on and they will get very hot 12V can be measured at the OpAmp IC13 C22 IC9 and IC10 on the supply pins 4 and 8 respectively 5 can be measured at the OpAmp 105 IC21 IC14 and IC19 on the supply pins 4 and 8 respectively 105 should be measured at the amp side of the fuses on the top side of the PCB These 6 supplies are all referenced to AGND Signal Flow TOP The signal enters the board through the ribbon cable For Ch A the signal is located on pin 4 ground and 5 signal It then goes into the feedback schematics FEEDBACK The signal goes into the balanced receiver IC13 1 2 3 The output pin 3 is fed into the high frequency amplifier 1 5 1 2 3 and then 1 5 5 6 7 At this point the signal is a square wave It is then fed into the comparator and through the gates IC6 amp IC7 Up to this point all signals can be measured using an oscilloscope connected to ground Q7 amp 08 transfer the pulses to 105 so to continue to follow them beyond these transistors requires that you ground the oscilloscope in the 105v beware if the scope is grounded in chassis ground connected in a grounded mains or similar you could short the 105v to ground this way and possibly destroy the oscilloscope and or the amplifier POWERGAIN the pulses reach the driver IC11 pin 1 and 2 The driver gen
23. 2 1 0 22 11 5 2 4 12V AUX 3 TP6 LM339AM 12V AUX 3 1 0 12V_AUX 3 5 GND 12 7 10 100 GND 1 GND 12 PFC GND R11 TP7 10K 1 339 TP26 12V AUX 3 R10 10K INO NOT USED TP24 PFC GND 12 LM339AM PWR AUX AUXILIARY PWR AUX 453V REF 53V P43 53V 90 53 9V 9V 9V_REF ND 9V REF 12V 12V TP37 00 3 UT Go bo NOT USED 12V POWERGOOD AUX Q1 10 Title TITLE Number NUMBER Date 8 10 2006 14 27 100N s 100N 100N RES GND CGND TC Electronic A S SEC Module title Revision 0 1 Filename P34401 E Designer Se DXF for lodde pads Wide pitch ribbon footprint DESIGNER MODULE TITLE Previous page Page of XX xx XX 184 R92 BAS216 040 FDH44N50 TOR 49 LLL 100 81 100 RES GND 177 164 5216 041 R136 C62 038 5210 FDH44N50 R94 BK
24. B AB or H amplifier Instead of amplifying the signal using resistive elements the output 18 generated by 2 switches that are either on or off Power supplies and power up down Supplies The Amp modules requires several supplies The 105 and 13 5V are split in two one for each pair of channels Each of the four channels has their own 12 supply Furthermore for each channel 5 is generated on the module H2V 4 D 45V 42V 5V gt 105V AGND 13 5V Ref to 105V o 105V H2V 4 5V AQ 4 v 12 AGND a 105V AGND 13 5V Ref to 105 105V 12 5 AGND 12V 5 Figur 1 Power supplies Power up If the 13 5V is not present a channel it won t operate at all The voltage can be measured at the driver at TP88 TP103 TP304 and TP319 Remember that this voltage 15 referenced to 105 If any of the 6 remaining supplies 15 missing there might be some switching but the switching frequency be correct It is most likely that there will be no switching at all switching frequency can be measure on the power PWM at TP101 TP116 17 and TP332 and should be between 400kHz and 500kHz square wave reaching from 105v to
25. Lee LESH per gt x x 56 E p ST 458 proc qp 5 jagu missa Prisme EA 4 Laut CO Tsthate I T arm 0 cd e Ot ruteni 5 239 DPCikts _ p qp 150 qd Clk ep i ci D Ck canadian d Poo JP Wet TR 1 T nu T4HQTLBS 50146 e EE qd writ FH x8 LAL 6 4441 4 gt 2 nd cud 2 Q Tst nta db lis code meN sO i 448 E amp Hf Pus 3 pesi Ch CHEE 1 3 gt 1 Ta mazo p x kia FIT IS TekPrte i 1 1 225 5 mA d gt 1 8 Te Tate UL ted LinB 4 o 1 in mu ary 9 15 C LEM 5 4 mag 7 4 1555 A uter a z 308 1 pp EN 3 1 E E genie Re 172527
26. Resonance When the 105v has reached 80 the pin 3 will go above the input thus making it s output pin be high impedance When the 13 5v reaches 028 and 027 will make 026 conduct current thus enabling the 105v reach the PwrGood comparators in IC7 When the 105v reaches about 80 pin 6 on IC7 will go below its reference and the output pin 7 will be high impedance When both pin 1 amp 7 on IC7 1 high impedance Q34 will conduct current thus making 035 gate negative making it to be high impedance Thus the PowerGood_2kW is released This is sensed by the input board and when 035 is not conducting this 1s interpreted as the resonance converter is up and running and the input board can start all its functions If the PowerGood 2kW is not released the input board will remain in standby Service tips If the 105v and the 13 5v is very low although the switches 018 019 is switching you probably have short on the outputs Please disconnect all outside circuitry by removing all amplifier fuses to see if it starts up When the outside short has been found continue repair there The PowerGood signal controls the power state on the input boards and the power state on the entire device So start by checking these They should be above 2v to signal good If they are below they signal fail If the resistors R62 and R78 in the auxiliary supply have opened the entire primary will end up in an in between stat
27. 451 x F DESIGN CHECKED REPLACES REPLACED BY DATE LABGRUPPEN Nomad Link Interface Power E ERE KUNGSBACKA SWEDEN Ni TIPspi LEVEL Mode FAN MASKED GAIN msb GAIN 156 BRIDGE CD BRIDGE Ext 52 az 55 E 33 183 1 R466 5 43931 11415 5 1 18K 125H1 8477 BdB 696 Down 3dB Down gt Re 2 Re ESHIK 33K 125H1 aida 2 gt 18U YPL MSE YPL LSB Clip Filter MSB YPL LSB Clip Mode HF Filter Cs Clk 251 wo UT Fan n SE 452 5 nz 188n Sey 444 4 18581 2516 DG 651 0 50 1 lt gt 184 189 gt 2515 gt 184 T 1 2 0 Clini fB 0417 5 7 HP D gt Ru 2585 498 gt 18V 5 gt 18V sak 12581 12757 18K 12515 No 525 R529 1 BE 182 PS gt 189 2M ER VPL MSE 2 1 lesii 4 17 125 15 VPL LSE 1043 i gt UclCt Ac UPL MSE x TIE LB 5455 280110 88
28. 5 goes below 0 5 this means that the temperature on the module have reached 100deg C then the controller will shut down the channel until it reaches 90deg C the controller will also lit the Temp led on the front to indicate this DIP switches The HP Filter switch 1s read by the controller through the shift register It will also generate a 18v to the JFet switch The Clip Mode switch 1 read by the controller through the shift register It will also pull down the 5v to ground thus turning off the UClip signal to the automatic attenuator The VPL switches is read by the controller through the shift register These switches will generate a DC voltage that 18 used by the VPL circuitry to clip the signal at the correct level The Bridge switch is read by the controller through the shift register It will also feed 5v to the relays that routes the signal to the other channel Also it will generate a 0 18v to trigger the 6dB JFET on the input circuitry The GAIN switches 1s read by the controller through the shift register They are also used to generate 0 18v to the JFets the input circuitry to set correct gain FAN Masked switch 18 read by the controller through the shift register It is used to make the controller to count in the output sound pressure to control the fans The GPI Level and Mode 15 sent directly to the controller since 1 needs to be sensed even in standby Service tips During service of an 8 channel ampl
29. FUSENB 12 1NO 1NO 1NO 1NQ NO 13 id C34 36 C35 E TPLITPI2 TPOTPI3 21 18 79 9 9 1 19 AGND 20 in 17 21 22 1NO 23 75 C46 24 25 1 0 1 0 AGND 26 7 i TP6 FUSENA 55 185 173 28 CLIPA 29 4 ENA 30 C6390255 C71 4 VOUTA e Ra av EN 7 1 2 A T2V 4 1 T T 75 2 TP421 VINA SL 17 164 49 9 0 02 o VINB AGND gt VINB 5 VOUTB 22 CLIPB moj 177 P oo TPI88 TP 87 __ FUSENB TENE 190 1NO 1NO 107 40 o C37 C106 C76 1NO AGND Em M50 M56 DR04021 B P34001 B Qu M49 M47 M48 M45 M46 g Jl Jl 0 g 3 0 8 0 3 0 8 0 3 0 8 0 3 0 8 0 M3 0X8 0MM of LE of Designer Electronic A S Title Module title TITLE MODULE TITLE Number Revision Previous page NUMBER 0 1 Date Filename Page of 7 10 2006 13 47 P34001 C xx SYNC CF2 FEEDBACK REF VCLIP e
30. PowerFail rapidly thus making all circuitry turn off in a nice manner PowerGood_AUX TOP When the standby supply has started and all auxiliary output voltages are stable 01 will be pulled negative by the standby supply as long as it s not forced to ground by 1 2 This will make 1 to be high impedance instead of shorted The input board senses this and uses this as a criterion for further startup Now we have reached this power supply state for standby It will remain in this state until we receive a Power On signal from the input board This will only happen if the PowerGood_AUX is high impedence PowerOn PFC When the input board puts 3 3v on the PWR_ON_CTRL node the diode in IC4 will conduct making the transistor in IC4 also conduct If the ENA from the mains detector 1 high this will make Q9 to conduct which makes the 12V_ON to be 12v If the ENA from the mains detector is low Q2 will conduct and prohibits Q9 from conducting PFC The PFC is made up around IC3 which 1 the controller IC The PFC controller is an advance integrated circuitry and I will not go into detail about its regulator function When it functions as it should it should keep the capacitor tank C22 C25 at 400VDC When the 12V_ON is close to 12v will have supply voltage and start to generate pulses to Q3 via amp When Q3 is conducting it will build up a magnetic flux in the coil L1 When Q3 is not conducting the coil L1 will disc
31. be a perfect square wave shape it looks more like a triangular wave But it should run at the frequency of 7 37 MHz During standby the controller uses the following pins NMLOn Out port low gt NomadLink on high gt NomadLink Off GPI Level In port Reading on dipswitch Out port NomadLink direction low normal high switched Out port when high the main PSU should start GPIMode In port Reading on dipswitch When the controller goes into operating mode 3 additional functions 18 started 1n the controller Analogue measurements The Analogue measurements will start for this to happen the analogue to digital converter in the controller needs to be supplied This is done via R436 to pin 27 This should be the same as the controller supply voltage 3 0 3 6v The A to D converter also requires a reference voltage to function properly this should be 2 49v 2 51v and could be measured at pin 29 0405 on top schematics will route the analogue level on its input pins to the controllers pins which are analogue input pins The controller decides which input that will be measured by changing the states on AMux 0 2 Digital measurements The digital data gathering interface will start Clk MISO MOSI and CS will go through 0409 amp 0411 to convert it to 5v logic When CSA D is pulled low 1v then Clk MOSI MISO will be routed to the lower board circuitry containing the information for ch A D and to t
32. phase through R56 amp R57 Its gain is set by R48 and depending on 018 can be 6dB 018 off or OdB 018 on This 6dB switch only exists on Ch A E and is only used when bridging 2 channels bridge mode Ch B input circuitry 1 not used U5 5 6 7 is when 032 is on an inverting amplifier with gain 1 032 is opened by selecting 35Hz high pass filter on the dip switches this causes C34 to form a 35Hz high pass filter U5 1 2 3 is preceded with a damper network formed by R54 R53 amp Q15 R52 is added to keep 015 from distorting the signal when opened When 015 1 on this network damps the signal 3dB and OdB when 015 1 open This signal 1 fed into U5 1 2 3 which has a gain set by R42 R41 amp R40 if Q14 1s open When 14 is closed R40 is shorted and electrically omitted U5 1 2 3 has Gain 3dB when 014 1 open and 9dB when 014 18 closed 015 and Q14 are controlled by the gain switches on the rear the amplifier Analogue control and monitor the signal goes through front panel attenuators and into the ACMIA schematic page It goes through R31 to U2 1 2 3 U3 18 an automatic limiter component By running current through its diode the signal 1s limited During normal operation there shall be no current going through this diode and this component has no affect on the signal U2 1 2 3 18 a non inverting amplifier and sends the signal out of the block again On the top schematics we can s
33. rr 14 Controller opera o won 15 odi M 15 AMAlO SUC Measure 15 16 Fant onto kesepian 16 16 111878 1016 1 80131 114 16 Analogue control and deesd erben ____________ ____ _ 16 AWE CS 17 17 Caent oic ter eiu cM 17 Average Current beara nwa 17 18 TID 18 Low Tim PC Gan CC gt 18 A 18 18 18 19 IBI dire 19 DCE aeui PR T 20 210020 Schematics E 21 SPS MR SC mc uit 20 oU NU 29 Pront Pane 30 32 Power Supplies power GOW ees PIO DCS 0 32 PONOT MI _6_68___ _ _____ __ _ 6 6 32
34. same manners The NomadLink LED 1s supplied from the input board so it has the ability to be lit even when the front panel registers are not powered as in standby or off The front panel is an extension to the AICO4b board shift registers but they are also supplied with an En Enable signal This signal when pulled low makes all shift registers output high impedance This En signal is mainly used upon boot up to make sure that the registers contain valid data before releasing current through the LED s The controller drives the LED s by at the same time feed the registers with data for a given row of LED s 1 7 together with the intended row ChA ChH selector When a row is selected the corresponding pin is driven low this enabling the transistor for that row 01 Q701 to conduct current When a row has been updated the controller moves on to update the next row and when it s finished with all rows it starts all over again En r 5 lt gt 5 59 479487 5016 A 5 E m a BCV46 E E 8 5 4 0 5 lt BRIDGE AB R 2k2 125 1 1688 125 1 R Mosi lt 4 7 125 1 2 e 2 l 4 1254 1x 8 4 1251 100K 125 1 4K 125 1 i Ri e o 4 7 125 1 3 1 L
35. 1 gt EL 4 7 125 1 85 46 4098 4 7 125 1 C Tac lor tor 4 125 1 48 38 35 32 fa 5 BRIDGE CD R SAT SANE SASXARSARSAR XAR z m 8 3 gt 2 2 21 4 2 aw 4 oec ter ter ter ter sr 4 92188 88 855 BA m SZ ang jesui gt 8 o 88334 35863 78 deno pr 35 R4 E 16 oc f SZAR BRIDGE EF HEF4 94BT 5016 1 2 125 1 R402 3 m DC SRCA mer gt gt LBLUD2 4RG 30 an VO 0804 LS 17 478 125815 2 E 6 478 125 a m tos 5 Ris 8 X 7 pm Ta edens dB 38138 33 48 34 GEL 47R 125u1x WAP RP ANS 1 4 8 5 6 4 4 4 4 4 V ChH User Interface 7 Led 8 channel KUNGSBACKA SWEDEN DRAWING A10D Circuit description The 100 Amplifier board incorporates 4 channel high power audio amplifier The board 18 build up as 2 stereo amplifiers Most supplies are shared between the 2 channels and split to the next 2 channels The 100 is a class D amplifier and the operation of a class D amplifier differs a lot from class A
36. 1 R42 R43 ix 2 2 LfOutA a 2K4 125W1 47R 125W1 16 41 100p 1009 xg 1K24 125 1 79 125W1 47K 12541 BAWS6 2 6 1802 0189 18V lt gt gt 189 18 853 108 8 1 eke 1 5 1 aei e 55320 105 47 35 47u 35 5 2142 122 2154 gums LfOutB 153 2K4 125W1 476 125W1 R191 116 4K64 125W1 R141 100p 1009 1K24 125 1 4392 01 8 aks ala 4 3 125 1 019440 6dB BAWS6 0187 gt gt CHECKED REPLACES REPLACED BY aad AIG2B KUNGSBACKA SWEDEN me sac ING NO Analogue input amp Gain 50 18 A 3 15 EE JE BZX84C24 gt TLO71CD 0401 0404 2 100 50 caog 100K 125W1 100K 12 gt FanCt i R41E 4 A 18 50U 3 14317 0403 TD SN 1 gt 189 C407 V 189 x e BCX56 16 10u 50 C404 z m 27K 125 1 cu 1071 1 gt o 150R 5x S z inti gt 5 gt 6 R409 y 5 on gt e 5 al 53 16 C405 0493 10u 509 SO0VUnrR lt 10 PurGood185V lt lt BC847C 8492 417 10K 125W1 Se 53 16 15UUnr lt 54 0408 199 504 2 41 C413 1
37. 14 forms a current limited 5v regulator This is biased from R481 When the voltage over R482 exceeds 0 6 the regulator will lower its output voltage until the current remains constant This 5vP supplies everything that needs to be on in standby most important the controller U407 UPcB The controller uses a lower voltage to operate and this is made through 0409 that will make the voltage be 3 0 3 6 LVPsB1 In standby all other voltages is turned off by Q401 and Q408 Start up There are 3 different ways to turn on this amplifier by NomadLink command by GPI only when Nomadlink is disabled by dip switch or on the front switches The Controller will scan the front switches for On Off amp Remote Manual on or off will directly generate and internal request to turn on or off the PSU When in Remote the same request will come from either Nomadlink or GPI depending on the switches This internal request will be generated to the PSU When PowerGood_Aux is high This means that if the standby supply is not on then the controller will not start the amp When the standby supply 1 on and a Power On 1 requested the Controller will pull PwrOnCt high and the power supply should start shortly after When the supply has reached sufficient output voltage it will release the PwrGoodl105 V Local supplies When PwrGood105V is high the controller will wait about 0 6s before doing anything and if all is ok it will then go over
38. 27 This opens Q421 and pulls this down through R486 This signals to the controller that the is activated During normal mode by closing these connectors for more than 100 will make the amp go on and when closing them again a second time the amp will go off The same goes for GPI2 By activating the dip switch GPI2 level trig is discarded By closing GPI2 for more than 100ms the amp will go on When opening GPI2 for more than 100ms the amp will go off GPO NLIB GPIO There are 2 semiconductor relays that control the GPO ports By driving current through the diode the relay closes The GPO2 is connected to the local 5v so this will be activated as soon as the amplifier is on The is connected to the controller serial circuitry and will be activated by the controller when there is a fault on any channel NomadLink NLIB GPIO NomadLink is a transformer isolated serial communication network Communication that comes into the IN port will only reach this device Communication on the Out port will be directly transferred to the IN port U417 has the capability to electrically exchange these ports so they switch functionality with each other This is done when devices receives communication on the Out port only and is controlled by the controller N R pin Ov means normal 3 3v means switched ports When NomadLink is turned off by the dip switches the controller pulls NMLOn to 3 3v This disables the NomadLink comple
39. 509 15UUnrR lt gt DG BCB47C cl DG 1KS 125 1 ESIGN ECKED REPLACES REPLACED BY 172 veli LABGRUPPEN Low KUNGSBACKA SWEDEN DRAWING NO voltage power supply tupel 5Vp A 5Vp 5 lt gt 5 4113 TLVe772 T E lt lu 16 D P x A N amp 7 7150 50 6 X d aa gt NLout 15 281 eH 85 14 A 1 3 A L SN74CBT3257D lt gt sus 0 LYb U417 gt NLin 5 A Node gt NLin SZ ERZ 83 aw 5 lt 1 1 Reversed gt NMLOn LM393D 0414 R522 184004 125W1 5 GPI1a amp 240K 125W1 R513 5 0422 GPO1b IC4 1 GPO1P e40K 125 1 R512 5V GPIeb REPLACES REPLACED BY NLIB GPIO i LABGRUPPEN B ud Nomad link and GPI interface KUNGSBACKA SWEDEN a NN NO 0421 OPTREL 4 gt 144004 7 7 100 125W1 i C431 10u 59 0424 PhSen 4 0410 ZN BCV47 5 1408 17 BC847C BAV99 S y 5 5 E 55 c gt DG PurGood 25 x 0411 847 ComCt lt 0416 5 y a CX56 16 A 0414 arl 7 gt 5 8 x 4 447 50
40. En qo sl A 2 Ez a 2 Belankue m m m Ala D b ul Esa D 5 5 ar f Ae u SC T m D 1i st E Ts n zh E mm umm Wo LOE _ 14 s quam 2 gt rj 1 VOL Uo A bre Up alm H oe ALAR A Lr D ua Lind E Lini Dig Linde ie ciis a ep cLisnric rn 4 1 a En B abe an En T Ae oS 42 F i Sen ha n misc b q IL qp 15203409 Liat 12020449 qo iLin D nlsocs agar B p c qp augur D a db E Aue _0 CLEC Cikt op Clic qq CLC qo gs aqu fee e edu 48 14 24 ad Omba i 1 EEF TOTE 4 ENTE THA Lec ch TE a m Coe S oki A15 ao ripe Fu e a E ie _ ____________
41. Line Extension Circuit description and schematics for 20 5 10 8 10 4 5 4 Some of the schematics included here are not complete to date They should be used for educational purposes only INDEX E 2 PZ OF Circuit GES Cir 4 buncuoHal oye 4 block 4 5 Stand Dy a Mam RECTOR 5 amp 6 POW a 6 PPO 6 6 teeta 7 E 9 eee ore 9 25 dio odore oum d 13 Power supplies and power T 13 ine 13 1 13 S eu eco ee 13 14 14 cr 14 14 b OPI cete
42. ction has kicked in The controller will then mute the channels although they are already off and then release everything 6sec after The controller will keep the LED CPL constantly lit on the front during this state VHF The VHF protection 1 located on the amplifier module but when it is activated the En_A will go low This is fed into the shift register 1 1 and when this has been pulled low while Mute and short circuit is inactive then it will be interpreted as a VHF protection The controller will keep the channel muted for 6s and lit up the led on the front DC Protection When DC appears on the output a protection circuitry on the amplifier module will kick in and destroy the channels fuses When this happens the DCProt signal which normally should be close to Ov will go either positive or negative from the amplifier modules depending on which fuse or both that has been destroyed This will trigger Q3 and send the information to the controller The controller will shut off the channel mostly to prevent any further damage The controller will indicate FAULT on the front by lighting up the VHF and CPL Temp Protection On U405 top schematics the channels temperature 1s monitored On the amplifier modules there are a temperature dependent resistor that is mounted on the cooler This will together with the impedance network R1 R430 translate to a voltage that 1s proportional to the temperature If the voltage on U405 1
43. e instead of switching between on and off If the auxiliary supply is not switching check these before going into deeper fault localizing T Fx bd A Ul 1 8MH Marking on silkscreen TR6 10AT H 250V FUSE 6 7 19 SCREWTERM SCREWTERM P34401 E 20 520 300 D1 19 M3 0X8 0MM M3 0X8 0MM M3 0X8 0MM M3 0X8 0M M GSIB1580 BRI SP20F Schematics VRECT VRECT eee DR04024 A DR04024 A 9 T DR04024 A DR04022 A GND2 12 _ Ore A N A M21 18 DR04024 A DR04023 A GND2 13 lt gt RES 5 GND 20 8 22 9 105V 105 RESONANCE 13 5V POWERGOOD RR 12V ON 400V 1 TP39 NN M SEC PAL 49 PWR CTR PFC SOPS STARTUP SOPS STARTUP PWR ON CTRL TP42 SOPS STARTUP 12V 12 AUX 4 12 AUX R8 LM339AM R2 R14 2
44. ee that on ch A and C they are fed directly back in On ch B and D they go through a relay RE401 RE402 This relay is activated when bridging 2 channels When Ch amp B are bridged Ch A s input signal 15 fed to Ch B but in opposite phase The signal then goes to U2 which is a balanced amplifier It senses the signal ground on the amplifier modules and cancels them out This rejection is trimmed in production by tuning After the amplifier modules the signal comes back trough the output filter coil This coil has an extra winding on it and it is used to sense the current that goes to the speaker This signal is fed into the amplifier U7 which compensates for the frequency dependency in the coupled coil K1 On the output of this amplifier is a signal that should be in direct proportion to the current going to the speaker Limiters Clip limiter Whenever the UClip signal is pulled low and Clip mode 1 set to soft dip switch enables Q5 to lead current there will go current through the LED in U3 thus limiting the signal The clip limiter is made up of 2 circuitries When the VPL is set at the highest voltage the amplifier module will clip whenever the output signal reaches the rail voltage If this is the case the amplifier module will pull down the UClip to ground When the VPL switches are set to a lower voltage it will generate a DC voltage VclCt that 1s fed into U4 Whenever the signal U2 3 goes above this 013 wi
45. erates output to turn on or off 010 according to the pulses on pin 1 This is made by driving pin 5 to about 10v over 105 Q4 and Q5 amplifies the current so the transistor turns on and off fast enough The driver generates output to turn on or off Q9 according to the pulses on pin 2 This is made by driving pin 7 to about 10 above the output signal Q3 and Q6 amplifies the current so the transistor turns on or off fast enough To measure this signal the oscilloscope must be grounded on the 101 When Q9 is on is 105v which means that the driver must supply 105v 10v 115v to Q9 to keep it conducting This is done by having a capacitor C38 connected to the switching node TP101 that charges itself when 010 is on D24 makes sure that C38 is never charged to more than 15v this voltage is then used to supply the output driver IC11 pin 8 and to supply the driver transistor Q3 Enable Disable of a channel 3 4 1 35 2222 2 TL301 C34 1 10367 78700 5 AGND Figur 2 Enable circuitry To be able to disable enable the amplifier two 2 input NAND gates have been implemented If the ENABLE 1s pulled low the output of the NAND is high When the enable pin is released the module has a pull up resistor to 5V the NAND gates just operate as inverters on the signal from the comparator TL3016 Protections On the Amp module differen
46. harge itself via D3 to the capacitor tank making voltage over them be more than Vin 1 41 The main point of having a PFC 1s to make the current in to the supply to be shaped as the voltage thus making the supply look like a resistive load on the mains The controller ensures this by sensing the current by measuring the voltage over R36 amp R43 Since the current has to have the same shape as the voltage the IC3 also senses the voltage on the mains through R53 Several different regulators inside IC3 make the voltage and the current to have the same shape sinusoidal on normal mains The controller senses the voltage on the capacitor tank through R42 amp R38 and ensures it to be 400VDC Resonant converter Resonance the resonance converter is a self oscillating circuitry But unlike the previous described standby supply this converter will oscillate on the resonance frequency of the capacitors C50 C51 C52 and the coil L7 The converter is made up by and it surrounding components When the 12V is close to 12v will have supply voltage through 1226 and R92 It will then start to generate pulses to 018 and 019 I will not go deeper into the primary side There are 3 taps on the secondary side of the transformer 105v 105v and 13 5v that is referenced to the 105 To keep the voltages steady 020 will control the current through IC6 and make sure that there are 210VDC between the 105v and 105v PowerGood_2kW
47. he front panel When CSE H is pulled low then Clk MOSI amp MISO will be routed to the higher board circuitry containing the information for ch E H The data gathering line consists of a number of shift registers connected in series 01 0101 U201 when CS goes lv it will take a sample of the data on the input pins and when a clock pulse are sent to them they will shift their data one step closer to the controller The controller will shift it into its memory in the same manners After all data has been shifted the controller stores the value as a representation of what s happening on the channels The same goes for data shifted out of the controller When CS goes 22v the inputs will be ready to receive new data and the outputs will be what the controller shifted to them FanControl The analogue measurements on the temperature on the modules will yield a specific fan value When the temperature is below 40deg C the fans will be at idle and FanCt should be close to 3 3 Between 40 and 60 deg C the fans will be temperature controlled the higher the temperature the lower the voltage When the temperature exceeds 60 deg C the fans will go at maximum and FanCt should be close to Ov Signal flow Input circuitry AIG2B The input circuitry is made up U6 and U5 U6 5 6 7 1 an inverting amplifier and its gain is 1 through R58 amp R59 This is fed into a summing amplifier U6 1 2 3 This amplifies signals with the same
48. ifier it 1s safe to remove the AICO4bExt board from the AICO4b board and run the amplifier only with the lower board You do not need to disconnect the Ch E H amplifier module If the amplifier does not start up set it to Manual On and follow the scheme below continue repair on Faulty 5vPh regulator no supply NLIPs or shorted 5vPh yes 5 5 check PwrGood_ Aux continue repair on supply supply 5 9v supply es Pin 42 high and 43 check connection to low on U407 the power switches es Connect the device to NLB60E and check the software PwrOnCt High check controller operation es high supply 5 18 amp 5 LVPsB1 es The board should be powered up If the communication led is blinking rapidly 3 blinks every second instead of once every other second when connected to NLB6OE The controller is stuck without valid software Please contact LAB Gruppen service department on how to download new software to the amplifier AICO4b Schematics Partly 1 2 Liga T ru BTBeCePOaL y Pai B n Clin Aa 811 Adutl B Fa 1 COut 1 44 7 qo M
49. imiters Clip limiter The amplifier module will clip whenever the output signal exceeds the rail voltage If this 1s the case the amplifier module will pull down the UClip to ground R233 BAS216 29 YVCLIF 299 jp 5 IC0 RB a ccm 11 082 8 A 98 10 0 vp 8234 1 69 032 BAS216 238 52 Figur 4 Clip detector In case the Amp is in hard clip the error signal in the feedback goes above normal level in the attempt to compensate the lack of output voltage This error signal is fed through R235 R224 R69 R3 and compared to supply voltage dependant limits at IC20 IC18 IC12 IC2 When clip is detected by 1 20 1 18 IC12 IC2 output goes high and it makes Q56 053 Q26 pull the Vclip to ground Service Tips Always make sure that the supplies and the EN signal is correct If the amplifier fuses are continuously blown remove the output FETs and exchange the fuses Set the input board to hard clip mode and feed the channel with a 1 kHz sine wave VPL indication on the front is normal in this case Instead of high frequency pulses you should now have 1 kHz square wave pulses Follow the pulses on the board and see where they stop If the amplifier is continuously in VHF protection then it should retry every 6 second seen as a short blink on the front If not then the protection circuitry 1 faulty
50. into operate mode LVPsB1 When PwrGood105V goes high 0406 amp 0402 will turn on and turn 0408 and 0401 0403 will regulate the voltage between 18 18 to be 35 5v 35 9v they are not adjust 401 until they are Since this voltage from the supply 1 floating 0401 sets its reference to ground to be exactly at 50 of this voltage U401 will push and pull 0405 amp 0403 until 15 equal to the voltage division R408 and R410 This makes the 18v 0406 1s a 5v regulator which will generate a local 5v this is not the same as 5vP standby voltage FanControl LVPsB1 0402 0404 forms the Speed control circuitry for the fans It 15 basically an inverting amplifier that can open and close Q404 through D401 If the FanCt from the controller is kept high the fans will be at low speed During power on the fans will start up with a high voltage to get them running this is done by C409 being discharged at the beginning The controller measures the temperature on the amplifier modules And if they go above 40deg the controller will lower the voltage on C409 by Pulse Width Modulating the FanCt signal Control Ports GPI NLIB GPIO the GPI ports are used to power on off the amplifier if the criterion for this is met This is 1f front switches are Remote On The DIP switch is set to The circuitry for 1 and 2 are identical If and GPI1b are connected to each other current flows through Q4
51. ll pull the UClip signal to ground When UClip is detected the signal is also fed to shiftregister U1 13 through a diode This tells the controller that the channel clips Current Limiter The Isen signal output from U7 1s a representation of the current going to the speaker This is fed into U10 4 7 This circuitry is a window comparator and when the signal exceeds the voltage over R90 the output U10 1 2 will go to 18v This triggers 027 and 025 to conduct current thus pulling the Ilim signal low This will through R28 and D2 lead current through the diode in U3 thus limiting the signal When ILim 1 detected the signal 1 also fed to the shiftregister U1 14 through a diode This tells the controller that the channel current limits Average Current Limiter The Isen signal 1 fed into DI to rectify the signal When this signal has amplitude enough it will charge C29 fairly slowly If this signal 1s sustained for about 200ms C29 has been charged enough to trigger 016 to limit the signal When this detector 18 active the signal 18 also fed to the shiftregister U1 7 This tells the controller that the channel limits Protections Turn off channels To turn of a channel 2 things need to happen The signal needs to be lowered and this happens when the controller sends out mute to the channel This will trigger Q4 to draw current through the diode in U3 Shortly thereafter Q21 pulls down the En_A signal going to the amplifier
52. modules thus turning off the output transistors There is a short delay between the signal 18 limited to the output stage shuts down This delay is to make the shutdown sound more nicely and is made out of D8 R47 amp C25 There is also a feedback signal telling that the channel has been muted through R50 This is fed into the shift register U1 6 Low Impedance The controller samples the input level on its analogue to digital converter It also receives signal on the shift register when the channel 1 in current limiting When the controller detects that a channel 18 in current limiting it will then check the voltage input and if the voltages is so low that there must be a load lt 1 Ohm on it it will turn off the channel for 6 second The controller will during this state lit up the CPL diode on the front Short circuit Since the current limiter is fairly slow attack time of 111 there is a possibility that short high frequency spikes could pass through the amplifier This could be dangerous to the output transistors so there is an additional protection for this The Sen signal is fed into U10 8 11 and compared to the voltage over R89 This should happen when the output current exceeds 30Apk If that 1 the case then the outputs U10 13 14 will go to 18v This will turn on Q29 Q23 amp Q26 this will immediately shut off the output transistors Instantaneously Q22 and 028 will be triggered and tell the controller that this prote
53. o be used on the primary side Normally when 5 optocoupler is not conducting current the transformer is charged with a high amount of energy transferring all the energy the transformer can handle When the output reaches the desired voltages D49 will start to conduct driving current through the 105 diode This will alter the sensitivity on the current sense circuitry and make 014 trigger on a lower primary current thus transferring less energy This regulation will make the primary side not to put in more energy into the transformer than we take out of it thus keeping steady output voltages When current flows in the diode of IC5 Q13 will start to conduct current thus making Pwr_AUX that goes beyond this page to be 12v Mains Detector TOP the Mains Detector 18 made up by 1 1 and its surrounding components When the mains go above 80VAC 113VDC the voltage on pin 4 will go above 6 2v D2 thus making pin 2 discharge C7 rapidly This will make pin 6 go below its reference thus making its output high This will slowly charge C8 through R3 and when it reaches 6 2v pin 14 will go high and the ENA will be high thus bypassing the soft start and enabling the power supply to turn on During this time pin 13 will be close to 12 If the mains cord is unplugged 13 will immediately go low thus making the diode IC2 conduct current and disable _ to reach PowerGood To input board this will signal a
54. t protections have been implemented on each channel DC These three protections VHF DC and Temp pull ENABLE LOW Well not completely to OV but to about 0 6V By measuring the ENABLE voltage you can determine if the Amp module protects itself ENABLE 0 6V it is disable from input board A special case is if short circuit has occurred Then the ENABLE voltage is pulled LOW 0 6V by the AICO board and the lim LED 18 constantly lit on the front 1 19331 3 3 100 E E 225 229 017 C Figur 3 Protections circuitry VHF If VHF occurs on the output the voltage over C224 C125 C209 C108 goes up and triggers the latch Q47 Q20 Q41 Q22 DC Protection If low positive DC occurs for some seconds the voltage over R275 R302 R257 R88 goes up and triggers the latch Q49 040 043 Q23 If negative DC occurs for some seconds the voltage over R276 R318 R258 R89 goes up and triggers the latch Q49 040 Q43 Q23 Temp Protection If the temperature on the PCB reaches approximately 100degC the voltage over R296 R300 R123 R293 goes up and triggers the latch Q59 Q60 Q28 Q30 Crowbar For safety reasons each channel has crowbar in case an output Power MosFET is shorted When high DC appears on the output a protection circuitry will kick in and destroy the channels fuses At the same time the FUSEN goes HIGH or LOW L
55. te until the external Power is activated from the input board PWR_ON_CTRL Stand by Auxiliary supply When the capacitor tank has reached about 80VDC the standby supply will try to start AUXILIARY This converter is a self oscillating type and will change frequency depending on its load The high voltage gt 80VDC is fed through R76 amp R77 and D13 will make sure that the SOPS_STARTUP has a constant voltage of 12v When the supply operates this voltage will be supplied from the winding through D16 thus relieving the stress on R76 amp R77 This voltage will make 010 conduct thus making 15 and 012 to conduct Now current flows through the primary winding building up a magnetic flux The current will increase linearly with the time and so will the voltage over R62 amp R78 current sense resistors When the voltage is enough it will trigger Q14 to conduct thus making 011 to discharge C85 and 012 gate This will stop the current in the primary winding and the voltage polarity on all transformer windings will reverse to discharge the magnetic flux Mainly the transformer discharges the flux to the secondary side building up the voltage over the secondary capacitors During this time the voltage on pin 2 on the transformer will be positive and through C35 and R89 it will keep 010 from conducting When the flux the transformer has been discharged the entire event will start all over again D7 taps out a primary voltage 12V_Aux t
56. tely by opening all the switches inside U417 The NMLOn should be close to Ov normally UPcB When no communication is present NML cable unplugged the processor s transmission pin Tx pin will be internal disconnected and will be 1 65v because of the voltage division between R461 and R470 NLIB GPIO this voltage will be gained in U413 1 2 3 to be 2 5v which will go through R473 through the transformer and end up at C432 U413 5 6 7 will in this state only transfer the 2 5v DC to it s output and through R462 through the transformer and to C433 U414 will detect any communication and in idle it will leave high output of about 3 3v During communication these voltages will have an AC square wave signal on them and it requires a digital storage oscilloscope to analyze them If the DC voltages are correct then it usually works Controller operation All levels on the IO pins on the controller is interpreted as 1v low 0 and gt 2v as high 1 Any input that is more than 4 5v is hazardous to the controller pin Controller The first criterion for the controller operation 1 that it has operating voltage on pin 5 17 and 38 This should be over 2 7v usually between 3 0 3 6v The second criterion is that the RESET pin 4 1 high The third and final criterion 18 that the controller has a clock source This could be measured on pin 8 of the controller using an oscilloscope The wave shape does not need to

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