LG LPCBM-340, LPCBM-345, LPCLM-340, LPCLM-345 Service manual

- 1-1 -
[CONTENTS]
SECTION 1. GENERAL
• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
SECTION 2. ELECTRICAL
• ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
• TROUBLESHOOTING GUDIE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
• IC VOLTAGE SHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21
• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
- 1-2 -
SECTION 1. GENERAL
SPECIFICATIONS
MODEL LPC-LM340A/X, LPC-BM340A/X
SECTION LPC-LM345A/X, LPC-BM345A/X
Power supply Refer to the back panel of the unit. Power consumption 13W Mass 3.24kg External dimensions (W x H x D) 360 x 170 x 260mm Output Power 2.5W x 2 Speakers 8x 2 Battery Operation
DC 12V, eight “C”(R14) and four “AA”(R6) batteries (not supplied) Fequency response 100 ~18000Hz Signal-to-noise ratio 59dB T.H.D 0.7% Tuning Range 65~74MHz, 87.5~108MHz or 87.5 ~108MHz Intermediate Frequency 10.7MHz Antenna Telescopic antenna Tuning Range 522~1611kHz or 530 ~1610kHz Intermediate Frequency 450kHz Antenna Ferrite bar antenna Recording System 4 Tracks 2 channel stereo Frequency Response 125 ~8000Hz Signal to Noise Ratio 40/45dB (REC/PLAY)
[General][CD][TAPE]
[TUNER]
[AM] (MW)
[FM]
* Designs and specifications are subject to change without notice.
Remote Control Operation Range
Point the remote control at the remote sensor and press the buttons.
Distance: About 23 ft (7 m)from the front of the remote sensor. Angle: About 30 °in each direction of the front of the remote sensor.
- 2-1 -
SECTION 2. ELECTRICAL
ADJUSTMENTS
1. TAPE DECK ADJUSTMENT
DECK MODE TEST TAPE TEST POINT ADJUSTMENT
ADJUST FOR DECK ADJUST
PLAY BACK MTT-114
SPEAKER Output Azimuth adjusting screw
STOP
FWD: LEFT
L/R Maximum
RVS
FWD: RIGHT RVS: LEFT
2. RECORD BIAS ADJUSTMENT
DECK MODE TEST TAPE TEST POINT ADJUSTMENT DECK ADJUST FOR
REC MODE MTT-5511 C241 L201
AUTO-RVS 85kHz±5kHz AUTO-STOP 60kHz±5kHz
- 2-2 -
TROUBLESHOOTING GUIDE
1. CD
- 2-3 -
• OPEN COLOSE NG
CONNECTOR LOCKING CHECK
DEFECTIVE MAIN
POWER SUPPLY
CHECK THE(SW502)
DEFECTIVE IC503
DEFECTIVE MICOM
MECHANISM
CHECK LOING CHECK (CN605, CN302)
CHECK VOLTAGE CHANGE LO+, LO- OF IC503
CHECK POWER SUPPLY CIRCUIT (CN603, CN302)
PN508 PIN8 = 6.2V, PIN7 = 5V, PN507 PIN1=5V
YES
YES
YES
NO
NO
NO
NO
- 2-4 -
• “READING” DISPLAY CHECK (=ONLY “CD” DISPLAY)
- 2-5 -
• READING OK CHECK (= “ NO DISC ” DISPLAY)
CONNECTOR LOCKING
CHECK(PN501 ,PN503)
DOES SLED MOVE?
DOSE LENSE MOVE?
(UP&DOWN)
DOSE LASER LIGHT?
DOES SPINDLE ROTATE?
IS READING OK?
CHECK PN501 PIN 14,15
(TA+,TA-)
CHECK PN503 PIN5.6
(SP+,SP-)
CHECK PN501 PIN 10(LD)
CHECK PN501 PIN 15, 16
(FA-,FA+)
CHECK PN503 PIN3, 4
(SL+,SL-)
DEFECTIVE PICKUP OR
IC503 OR IC501 OR IC502
DEFECTIVE PICKUP OR
IC503 OR IC501
DEFECTIVE PICKUP OR
IC502
DEFECTIVE PICKUP OR
IC503
DEFECTIVE PICKUP OR
IC503 OR IC501 OR IC502
A
B
C
D
E
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
- 2-6 -
• READING OK CHECK #A(=“NO DISC” DISPLAY)
DOSE SL+ WAVEFORM
APPEAR AT(IC503 PIN 14 AND
PN503 PIN3)WAVEFORM #2
SLED MOTOR WAVE
DOSE SLIN WAVEFORM
APPEAR AT (IC503 PIN5)
WAVEFORM #2 SLED
DRIVE WAVE
CHECK PN503 CONNECTOR LINE
DEFECTIVE IC501
DEFECTIVE IC503
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICUP
SLED MOTOR
A
YES
NO
NO
NO
NO
NO
- 2-7 -
• READING OK CHECK #B(=“NO DISC” DISPLAY)
DOSE FA+ WAVEFORM
APPEAR AT(IC503 PIN 1 5 AND
PN50 1 PIN 16)WAVEFORM #3
FOCUS COIL DRIVE WAVE
DOSE FAIN WAVEFORM
APPEAR AT (IC503 PIN26)
WAVEFORM #3 FOCUS
DRIVE WAVE
CHECK PN50 1 CONNECTOR LINE
DEFECTIVE IC50 1
DEFECTIVE IC503
DEFECTIVE PN501
CONNECTOR
DEFECTIVE PICUP
FOCUS ACTUATOR
B
YES
NO
NO
NO
NO
NO
- 2-8 -
• READING OK CHECK #C(=“NO DISC” DISPLAY)
IC ?V APPLIED TO PIN 10 OF PN501
LASER SUPPLY VOLTAGE CHECK
IS 3.3V APPLIED TO
PIN3 OF IC502
RF IC SUPPLY VOLTAGE
CHECK
CHECK PN501 CONNECTOR LINE
DEFECTIVE IC501
IS 2.0V PIC2 OF IC502
LASER CONTROL
VOLTAGE CHECK
DEFECTIVE IC501
DEFECTIVE IC503
DEFECTIVE PICUP
FOCUS ACTUATOR
DEFECTIVE PN501
CONNECTOR
C
YES
YES
NO
NO
NO
NO
NO
NO
- 2-9 -
• READING OK CHECK #D(=“NO DISC” DISPLAY)
DEFECTIVE IC501
DEFECTIVE IC503
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICUP SPINDLE MOTOOR
CHECK PN503 CONNECTOR LINE
D
NO
NO
NO
NO
DOSE SP+ WAVEFORM
APPEAR AT(IC503 PIN 12 AND
PN503 PIN6)WAVEFORM #4
SPINDLE MOTOR DRIVE WAVE
DOSE SPIN WAVEFORM
APPEAR AT (IC503 PIN6)
WAVEFORM #4
SPINDLE DRIVE WAVE
YES
YES
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