LG LPC-LM340X User manual

MODEL: LPC-LM340X
SERVICE MANUAL
P/NO : AFN32840831 JANUARY, 2007
MP3/CD CASSETTE
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL.
MODEL: LPC-LM340X
http://biz.lgservice.com
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- 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
• SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23
• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31
• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43
❍SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
❍SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
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- 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 8Ωx 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.
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- 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
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- 2-2 -
❏TROUBLESHOOTING GUIDE
1. CD
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- 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
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- 2-4 -
• “READING” DISPLAY CHECK (=ONLY “CD” DISPLAY)
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- 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
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- 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
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- 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
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