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SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

Internal Use Only

Website http://biz.lgservice.com

2.1 ch Wireless Sound Bar

NOVEMBER, 2015

P/NO : AFN77195019

MODEL: LAS454B (LAS454B, S55A3-D)

MODEL: LAS454B

(LAS454B, S55A3-D)

Summary of Contents for LAS454B

Page 1: ...ON BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Internal Use Only Website http biz lgservice com 2 1 ch Wireless Sound Bar NOVEMBER 2015 P NO AFN77195019 MODEL LAS454B LAS454B S55A3 D MODEL LAS454B LAS454B S55A3 D ...

Page 2: ...1 1 CONTENTS SECTION 1 GENERAL SECTION 2 CABINET MAIN CHASSIS SECTION 3 ELECTRICAL SECTION 4 WIRELESS SUBWOOFER PART SECTION 5 REPLACEMENT PARTS LIST ...

Page 3: ...1 2 SECTION 1 GENERAL CONTENTS ESD PRECAUTIONS 1 3 WIRELESS SUBWOOFER CONNECTION 1 4 HIDDEN KEY MODE 1 5 MCS EQ HIDDEN KEY GUIDE 1 6 MCS EQ PROGRAM UPDATE GUIDE 1 7 SPECIFICATIONS 1 8 ...

Page 4: ...harges sufficient to damage ESD devices 5 Do not use freon propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparabl...

Page 5: ...standby LED on the main unit blinks quickly 3 If the LED of the wireless subwoofer already blinks in yellow green continually you can skip this step Press and hold PAIRING on the back of the wireless subwoofer for more than 5 seconds The LED of the wireless subwoofer lights up alternately in red and yellow green 4 Disconnect the power cord of the main unit and the wireless subwoofer 5 Connect them...

Page 6: ... POWER OFF Setting VOL Exit STANDARD CLIP Algorithm Edit Main unit Volume Remote control VOL Wireless RF Change Main unit Volume Remote control WOOFER LEVEL BYPASS Sound Effect Main unit Volume Remote control DRC ON APD Time Display Main unit Volume Remote control DRC OFF APD On Off Main unit Volume Remote control AUTO POWER ON Up VOL Down VOL Right VOICE Left STANDARD Enter CINEMA TV Remote ON Re...

Page 7: ...ossible to connect wireless subwoofer Ex 6 Press remote control VOICE key 1 time Check EQ version Ex 7 Press remote control VOICE key 1 time Check option Press remote control VOL Up VOL Down STANDARD Left VOICE Right key Ex 8 Power cord unplug 2 EEPROM Initialize Please connect the Display Jig to the main unit 1 Power on 2 Press main unit volume key and remote control VOICE during 3 seconds 3 Disp...

Page 8: ... USB driver is E 2 Update Please connect the Display Jig to the main unit 1 Power on 2 Press main unit volume key and remote control VOL during 3 seconds USB Mode 3 Insert USB 4 Display in VFD MCS MCS UP FINISH Power off EQ EQ UP FINISH Power off Wireless Tx UPDATE WR XX Progress FINISH Power off Wireless Rx UPDATE SEND XX Progress FINISH Power off 5 Loading is shown while updating Never remove US...

Page 9: ...jack x 1 Available Digital Input Audio Sampling Frequency 32 kHz 44 1 kHz 48 kHz 88 2 kHz 96 kHz Available Digital Input Audio format Dolby Digital DTS Digital Surround PCM AMPLIFIER RMS OUTPUT POWER Total 300 W Front 50 W 50 W 4 Ω at 1 kHz 10 THD Subwoofer 200 W 3 Ω at 80 Hz 10 THD WIRELESS SUBWOOFER S55A3 D Power requirements 120 V 60 Hz Power consumption 33 W Type 1 Way 1 Speaker Impedance 3 Ω ...

Page 10: ...2 1 SECTION 2 CABINET MAIN CHASSIS CONTENTS EXPLODED VIEWS 2 3 1 MAIN SET SECTION 2 3 2 WIRELESS SUBWOOFER SECTION 2 5 3 PACKING ACCESSORY SECTION 2 7 ...

Page 11: ...2 2 ...

Page 12: ...FRONT WIRELESS 252 CABLE2 G F 264 264 258 A43 257 A52 B T F 255 D CABLE1 D E B A 502 A46 CABLE3 MAIN G 463 C 300 EXPLODED VIEWS 1 MAIN SET SECTION NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE ...

Page 13: ... 951 957 956 956 A900W A45W A54W A47W 952 CN901 953 A49W 960 2 WIRELESS SUBWOOFER SECTION NOTES THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE ...

Page 14: ...802 Box 803 Packing Main 801 Owner s manual 900 Remote control 804 Bag 808 Batteries 2 835 Wall bracket 806 Optical cable 3 PACKING ACCESSORY SECTION ...

Page 15: ...2 8 ...

Page 16: ...REMOTE CONTROL 3 15 6 OPTICAL 3 16 7 PORTABLE 3 17 8 AUDIO PWM 3 18 9 AUDIO AMP 3 20 WIRING DIAGRAM 3 21 BLOCK DIAGRAMS 3 23 1 SYSTEM BLOCK DIAGRAM 3 23 2 POWER BLOCK DIAGRAM 3 25 CIRCUIT DIAGRAMS 3 27 1 SMPS CIRCUIT DIAGRAM 3 27 2 MAIN DSP CIRCUIT DIAGRAM 3 29 3 MAIN INTERFACE CIRCUIT DIAGRAM 3 31 4 MAIN PWM AMP CIRCUIT DIAGRAM 3 33 5 MAIN POWER CIRCUIT DIAGRAM 3 35 6 FRONT CIRCUIT DIAGRAM 3 37 C...

Page 17: ...er on the unit 1 1 Solution Replace SMPS board 1 2 How to troubleshoot Countermeasure 1 Check the PVDD voltage 24 V at pin4 5 6 When you check the no power at this point then replace SMPS board 1 3 Service hint Any picture Remark MAIN board top view PVDD PVDD CN601 pin4 5 6 CN601 pin4 5 6 ...

Page 18: ... If 3 3 VA is not checked at the point then find 12 V at pin5 of IC606 3 1 2 is NG Replace IC606 2 3 Q601 1 Check 12 V at the Collector of Q601 pin2 2 If 12 V is not checked at the point then find 11 V at the Base of Q601 pin3 3 1 2 is NG Replace Q601 MAIN board top view MAIN board top view MAIN board top view L604 L604 L618 L618 Q601 Q601 pin2 collector pin2 collector pin3 base pin3 base IC603 pi...

Page 19: ...the soldering status of JK502 2 Please check L501 L502 POR_L POR_R signal of portable jack JK502 If you can t find input signal replace JK502 3 If you can find input signal check pin13 14 of IC508 4 If you can t find signal at pin13 14 of IC508 replace IC508 3 3 Service hint Any picture Remark MAIN board bottom view JK502 JK502 L501 L502 L501 L502 IC508 IC508 ...

Page 20: ... CN506 and Wireless module 2 Please check 3 3 V of WL_3V3 at L509 If 3 3 V is ok at L509 please check SPI signal WL_SPI_CS D0 WP DI CLK of IC505 pin1 2 3 5 6 3 If you can t have no signal please replace IC505 4 If 3 is OK then proceed S W update Update Wireless TX Main set and Wireless RX Subwoofer each 4 3 Service hint Any picture Remark MAIN board top view MAIN board bottom view IC505 IC505 L509...

Page 21: ... Bluetooth cable connection on your eyes at CN508 and Bluetooth module 2 Please check 3 3 V of 3 3VA at L504 If 3 3 V is OK at L504 please check BT_SDA BT_SCL BT_RST pin53 51 25 of IC502 and BT_RX BT_TX pin29 27 If you have no signal please replace IC502 5 3 Service hint Any picture Remark MAIN board top view MAIN board bottom view IC502 IC502 L504 L504 CN508 CN508 ...

Page 22: ...t Countermeasure 1 Please check 3 3 V of 3 3VA at L503 If you can check 3 3 V please confirm OPT_DET signal R5R8 in MAIN board when optical mode 2 In spite of process 1 set has abnormal output then replace IC507 6 3 Service hint Any picture Remark MAIN board top view JK501 JK501 IC507 IC507 L503 L503 R5R8 R5R8 ...

Page 23: ... power on again 3 Check DC Voltage of speaker out FL CN703 pin1 2 FR CN704 pin1 3 4 Check resistor crack cold solder of PWM IC out R751 R753 R759 R761 5 If PWM IC out is ok and speaker out FL FR has DC Voltage Replace IC703 AMP IC on MAIN bottom board 7 3 Service hint Any picture Remark MAIN board top view MAIN board bottom view CN703 CN703 CN704 CN704 IC701 PWM IC IC701 PWM IC IC703 AMP IC IC703 ...

Page 24: ...01 pin4 5 6 If PVDD voltage has 8 5 V under refer to SMPS board repair guide page 3 2 4 Check GVDD VDD voltage 12 V of IC703 pin1 2 If GVDD VDD voltage has 8 5 V under refer to 12 V no power repair guide page 3 3 5 Check impedance 4 Ω of speaker unit If impedance of speaker unit has 1 Ω under replace speaker unit 6 If check point 3 4 5 is ok replace IC703 AMP IC on MAIN bottom board 8 3 Service hi...

Page 25: ...T power off check Red LED blink at intervals of 0 5 sec B Protection 2 Turn MAIN SET power on again 3 Check voltage 3 3 V of AMP_PROTECT signal pin2 of Q701 4 If pin2 of Q701 is Low 0 V replace IC703 AMP IC on MAIN bottom board 9 3 Service hint Any picture Remark MAIN board top view MAIN board bottom view Q701 Q701 Pin2 Pin2 IC703 AMP IC IC703 AMP IC ...

Page 26: ...3 11 WAVEFORMS OF MAJOR CHECK POINT 1 CRYSTAL FIG 1 1 X501 24 MHz 1 FIG 1 2 X502 X701 24 576 MHz 2 1 2 2 ...

Page 27: ...3 12 2 FLASH MEMORY FIG 2 VCC CS CLK DO 3 4 5 6 6 5 4 3 VCC CS CLK DO ...

Page 28: ...3 13 3 TACT KEY FIG 3 2 Press FUNC Key 0 72 0 82 V FIG 3 1 Press Power Key 1 1 13 V 7 8 FIG 3 3 Press VOL Key 0 424 0 485 V 9 FIG 3 4 Press VOL Key 0 V 10 8 10 7 9 ...

Page 29: ...3 14 4 USB FIG 4 1 USB_5V 11 FIG 4 2 USB D 12 FIG 4 3 USB D 13 11 13 12 ...

Page 30: ...NTROL FIG 5 1 Input Voltage 14 FIG 5 2 Low Timing 15 Item Measured Spec Input Level 3 3 V IR Receiver Spec 2 7 5 5 V Low Timing 4 4 ms 3 6 ms 5 04 ms High Timing 4 48 ms 4 08 ms 5 04 ms FIG 5 3 High Timing 16 15 16 14 ...

Page 31: ...3 16 6 OPTICAL FIG 6 1 OPT_IN 17 FIG 6 2 OPT_DET 18 18 17 ...

Page 32: ...3 17 7 PORTABLE FIG 7 1 ADC IC 5 V 19 FIG 7 2 ADC IC 3 3 V 20 FIG 7 3 Analog Input Voltage 1 1 27 Vrms 21 21 19 20 ...

Page 33: ...3 18 8 AUDIO PWM 1 2 FIG 8 2 PWM IC 1 2 V FIG 8 1 PWM IC 3 3 V 22 23 FIG 8 3 BCK 24 FIG 8 4 LRCK 25 23 24 25 22 ...

Page 34: ...3 19 AUDIO PWM 2 2 FIG 8 5 Front L 384 14 kHz FL FL 26 FIG 8 6 Front R 384 17 kHz FR FR 27 26 27 ...

Page 35: ...3 20 28 30 29 9 AUDIO AMP FIG 9 1 AMP IC PVDD PVDD 24 V 28 FIG 9 2 PVDD GVDD AMP_PDN 1S 28 29 30 ...

Page 36: ... L SMD 3pin Audio R DIP 6pin B to B Main to SMPS SMD 26pin Main to Wireless FFC Wireless module BT module SMD 10pin Main To BT FFC SMD 10pin Main To Front FFC DIP 2pin Power Cord SMPS PCB Main PCB Front PCB LED Tact Key RCU receiver WIRING DIAGRAM ...

Page 37: ...ET AMP_P_CTRL 50 W AMP TAS5612 AUDIO OUT AUDIO IN LED DC to DC LDO Reset IC MLC3730 CS8422 DIR_LRCK BCK ADATA DIR_CSD TEMP RCBL INT DIR_RST OPT_DET PORT_DET OPT_IN PCM1808 Portable IN Optical IN DIR_SDA SCL ADC_ADATA ADC_BCK LRCK LFE_P N MAIN_PWR_CTRL DRV_VBUS2 0 DIR_MCLK PORT_L R WL_INT CSR8811 BT_CTS RTS BT_SCL SDA BT_RST Wireless Rx PWM_TX_LRCK BCK ADATA2 WL_SPI MUTE CLK DAT MSG_RDY Option BLOC...

Page 38: ..._1 2VA PLL_1 2VA Switch BD2242G 1 2 VA MLC3730 WIRELESS Module PWM PS9860 DIR CS8422 USB For update VCC_3 3V WL_3V3 3 3 VA BT Module ADC PCM1808 PWM_3 3V VCC_3 3V RCU 3 3 VA OPTICAL 3 3 VA AVCC_5V VCC_3 3V DCDC TPS563200 DCDC TPS563200 Option AMP_P_CTRL MAIN_PWR_CTRL WL_PWR_CTRL Switching TR 12 VA DRV_VBUS2 0 2 POWER BLOCK DIAGRAM ...

Page 39: ... LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED THIS WAY IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS P...

Page 40: ...30 3 29 21 19 20 2 18 17 8 10 7 9 6 5 4 3 1 13 12 WAVEFORM NUMBER A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T DSP EAX66789701 Rev1 3 12 MAIN 2 2015 07 08 2 MAIN DSP CIRCUIT DIAGRAM ...

Page 41: ...3 32 3 31 3 MAIN INTERFACE CIRCUIT DIAGRAM 11 WAVEFORM NUMBER A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T INTERFACE EAX66789701 Rev1 3 12 MAIN 3 2015 07 08 ...

Page 42: ...3 34 3 33 2 23 24 25 22 26 28 30 29 27 WAVEFORM NUMBER A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T PWM AMP EAX66789701 Rev1 3 12 MAIN 4 2015 07 08 4 MAIN PWM AMP CIRCUIT DIAGRAM ...

Page 43: ...3 36 3 35 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T POWER EAX66789701 Rev1 3 12 MAIN 5 2015 07 08 5 MAIN POWER CIRCUIT DIAGRAM ...

Page 44: ...3 38 3 37 15 16 14 WAVEFORM NUMBER A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T FRONT EAX66769801 Rev1 2 5 2015 07 08 6 FRONT CIRCUIT DIAGRAM ...

Page 45: ...VA 3 V_REG 19 VL 1 71 V 5 25 V VA 3 135 V 3 465 V V_REG 3 135 V 3 456 V VL 3 32 V VA 3 32 V V_REG 3 32 V IC508 IC A D Converter PCM1808 VCC 3 VDD 4 VCC 4 5 V 5 5 V VDD 2 7 V 3 6 V VCC 5 08 V VDD 3 32 V IC603 IC DC DC Converter MP1432 VIN 7 VIN 4 5 V 45 V VIN 25 2 V IC604 IC605 IC606 IC DC DC Converter TPS563200 VIN 3 SW 2 VIN 4 5 V 17 V SW 0 76 V 7 V VIN 12 01 V SW 1 22 V 5 15 V 3 35 V IC607 IC608...

Page 46: ...terface CN508 Connector Wafer FFC 10031HR H10 10P 1 00MM 1R ANGLE SMD T REEL NATURAL Main to Front for CM2820 YEON HO ELECTRONICS CO LTD 10 3 3 V 3 31 V BLUETOOTH Interface CN601 Connector BtoB 25032HS H06F1 TR 6P 2 50MM STRAIGHT SOCKET DIP TRAY 7 9mM LAS550H YEON HO ELECTRON ICS CO LTD 4 5 6 PVDD 24 V from SMPS CN705 Connector FFC 10031HR H10 10P 1 00MM 1R ANGLE SMD T REEL NATURAL Main to Front f...

Page 47: ...3 44 3 43 PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW NOTE Warning Parts that are critical with respect to risk of fire or electrical shock ...

Page 48: ...3 46 3 45 2 MAIN P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 49: ...3 48 3 47 3 FRONT P C BOARD DIAGRAM TOP VIEW BOTTOM VIEW ...

Page 50: ...WAVEFORMS OF MAJOR CHECK POINT 4 6 1 VOLTAGE 4 6 2 AMP VOLTAGE 4 7 3 PWM 4 8 4 LED 4 9 WIRING DIAGRAM 4 11 BLOCK DIAGRAM 4 13 CIRCUIT DIAGRAMS 4 15 1 WOOFER SMPS CIRCUIT DIAGRAM 4 15 2 WOOFER AMP CIRCUIT DIAGRAM 4 17 3 WOOFER KEY CIRCUIT DIAGRAM 4 19 PRINTED CIRCUIT BOARD DIAGRAMS 4 21 1 WOOFER SMPS P C BOARD 4 21 2 WOOFER AMP P C BOARD 4 23 3 WOOFER KEY P C BOARD 4 23 ...

Page 51: ...D voltage is not checked replace woofer SMPS board 1 2 Service hint Any picture Remark Woofer AMP board bottom view Woofer AMP board top view PVDD PVDD pin3 4 5 6 at WCN601 pin3 4 5 6 at WCN601 PVDD PVDD pin7 at WIC606 pin7 at WIC606 Nearby WC610 Nearby WC610 PVDD PVDD pin7 at WIC607 pin7 at WIC607 Nearby WC686 Nearby WC686 PVDD PVDD at WCA601 at WCA601 ...

Page 52: ...tage then you replace woofer SMPS board 2 2 3 7 VA 1 Check 3 7 VA at WL606 coil 2 If 3 7 VA is not checked at the point then find PVDD at pin7 of WIC607 3 1 2 is NG Replace WIC607 If you can t check PVDD voltage then you replace woofer SMPS board Woofer AMP board top view Woofer AMP board top view 12 V 12 V at WL604 at WL604 PVDD PVDD at pin7 of WIC606 at pin7 of WIC606 3 7 VA 3 7 VA at WL606 at W...

Page 53: ...5 3 Check 3 3 VA at pin7 8 of WIC603 4 Check 3 3V_PWM at WL615 nearby WIC601 If all voltages are OK then check the PVDD voltage of woofer SMPS board Woofer AMP board top view 3 3V_PWM 3 3V_PWM at WL615 at WL615 3 3 VA 3 3 VA at WCA603 WL627 at WCA603 WL627 3 3 VA 3 3 VA at pin7 8 of WIC603 at pin7 8 of WIC603 3 3V_PWM 3 3V_PWM at pin5 of WIC605 at pin5 of WIC605 ...

Page 54: ...and push Mute key sustain 3 5 sec Subwofer Push Pairing key on the back case of the wireless subwoofer The LED of of the wireless subwoofer blink red and green pull out power cord The main set and the wireless subwoofer are factory reset mode then power on Woofer KEY board top view Woofer AMP board top view 3 3 VA 3 3 VA at WL616 at WL616 Wireless module Wireless module Connection check Connection...

Page 55: ...4 6 WAVEFORMS OF MAJOR CHECK POINT 1 VOLTAGE FIG 1 1 WIC607 3 7 VA 1 FIG 1 2 PWM 3 3 V 2 FIG 1 3 Wireless 3 3 VA 3 3 2 1 ...

Page 56: ...4 7 2 AMP VOLTAGE FIG 2 1 Woofer PVDD PVDD 34 5 V 4 FIG 2 2 Woofer 12 V 5 4 4 5 ...

Page 57: ...4 8 3 PWM FIG 3 1 Woofer PWM SW SIgnal 6 FIG 3 2 Woofer PWM SW SIgnal 7 7 6 ...

Page 58: ...4 9 4 LED FIG 4 1 Pairing Off Status Red LED 8 FIG 4 2 Pairing On Status Yellow LED 9 9 8 ...

Page 59: ...4 10 ...

Page 60: ... Cable 10P WCN602 SMD 24P B to B Wireless module Wireless module PN901 DIP 2P Power Cord WOOFER SMPS PCB WOOFER AMP WCN601 DIP 10P WCN604 DIP 2P JK401 Harness Cable 2P WOOFER PAIRING KEY WCN605 DIP 3P LED CNT 4 12 4 11 WIRING DIAGRAM ...

Page 61: ...WOOFER AMP PVDD WOOFER AMP SW LPF DC DC DC DC LDO PVDD PVDD PWM 3 3 Wireless 3 3 3 7 V LDO PWM PWM_SW PWM_SW 12 V SW LPF Flash 4 14 4 13 BLOCK DIAGRAM ...

Page 62: ...WOOFER SMPS CIRCUIT DIAGRAM WHEN SERVICING THIS CHASSIS UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIR...

Page 63: ...4 18 4 17 9 8 7 6 4 4 3 2 5 1 WAVEFORM NUMBER A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T WF AMP EAX66304701 Rev1 2 10 2015 11 17 2 WOOFER AMP CIRCUIT DIAGRAM ...

Page 64: ...4 20 4 19 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J WF KEY EAX66305401 Rev1 2 9 2015 11 17 3 WOOFER KEY CIRCUIT DIAGRAM ...

Page 65: ...4 22 4 21 PRINTED CIRCUIT BOARD DIAGRAMS 1 WOOFER SMPS P C BOARD TOP VIEW BOTTOM VIEW NOTE Warning Parts that are critical with respect to risk of fire or electrical shock ...

Page 66: ...4 24 4 23 2 WOOFER AMP P C BOARD 3 WOOFER KEY P C BOARD TOP VIEW TOP VIEW BOTTOM VIEW BOTTOM VIEW ...

Page 67: ...4 26 4 25 ...

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