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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- 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
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- 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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- 2-10 -
• READING OK CHECK #E(=“NO DISC” DISPLAY)
E
DOSE TA+ WAVEFORM
APPEAR AT(IC503 PIN17 AND
PN503 PIN 15)WAVEFORM #5
TRACKING COIL DRIVE WAVE
DOSE TAIN WAVEFORM
APPEAR AT (IC503 PIN23)
WAVEFORM #5
TRACKING DRIVE WAVE
CHECK PN503 CONNECTOR LINE
DEFECTIVE IC501
DEFECTIVE IC503
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICKUP OR
IC502
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICUP
SPINDLE MOTOOR
DOSE ARF SIGNAL APPEAR?
(IC502 PORT8)
WAVEFORM#6
DOSE FE, TE SIGNAL APPEAR?
(IC502 PORT FE:23,RE:21)
WAVEFORM#6
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
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- 2-11 -
2. MAIN POWER
Main Power input (AC-cord in)
LCD Display “Hello” Check the Voltage-selector 110V/230V
(Duble Voltage only)
Check the DC out of C813(+) Check the Fuse Replace the Fuse
Replace the ZD805
Replace the Q810
Check the ZD805 of +13V
Replace the IC801
Check the D602, D604, D605
Check the ZD803, Q807
Check the Q601
Replace the X601, X602
Check the Q810 “E ”
DC Power-output
Check the
D901,D902,D903,D904
Check the DC power output of IC801
pin3 +5.2V
Check the power-output IC601
pin17,54,90?
Check the DC +5.2V output of
Q808 “C”
Check the Reset of IC601
pin11, Q601 “C”
Check the Oscillation of X601,X602
Replace the IC601
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
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- 2-12 -
3. MUTING CIRCUIT(MUTE)
4. FUNCTION MODE AUDIO ABNORMAL
Dose “ HIGH ” appear at
Q305, Q306 “ B ”
Check the “LOW ” of Q305, Q306 “E ”
MUTE
TAPE
CD
TUNER
Check the signal input of IC301 pin2, 5
Check the signal input of IC301 pin1, 6
Check the signal input of IC301 pin3,4
Refer to “Tuner Pack Trouble Shooting ”
Check the signal input of PN302 “R-CH ”“L-CH”
Refer to “TAPE Trouble Shooting ”
Check the “HIGH” of the
IC601 pin9
Check the pattern
Replace the Q305, Q306
Check the IC601
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
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- 2-13 -
5. IC301
Check the IC601 Function Selector
Check the Pattern
Replace the IC301
Check the IC601
END
Check the Power supplying to
IC301 pin24
Check the +8.2V DC
output ZD302
Check the Data of
IC601 pin 6, 7
(CD ➞TAPE Function)
Check the CLK Data of
IC301 pin 21,22
NO
NO
NO
NO
YES
YES
YES
YES
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- 2-14 -
6. TUNER PACK
Check the Tuner Power of
PN101 “Tu- B+”
Check the DC output of
“HIGH” Q818 “C”
Check the “high”
Q819 “B ”
Check the DC output
Q802 “E”, pattern
Replace Tuner pack
CE : Chip Emable
DI : Data Input(From u-com)
DO : Data Output(to u-com)
CLK : Tuner Mode Clock
Check the PN301 of
CE, DI, DO, CLK (PLL)
Is the normal?
END
YES
YES
YES
YES
NO
NO
NO
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- 2-15 -
7. TAPE DECK
Check the power supplying to
IC201 pin18
Check the signal output of
IC201 pin5,20
Check the “LOW” of Q210, 211 “B ”
Check the DC output
Q815 “C”
Check the “high”
IC601 pin92
Replace
the Deck Mecha
Check the pattern
Check the Deck Mecha
Replace the IC201
YES
YES
YES
YES
NO NO
NONO
[Play]
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- 2-16 -
[REC]
Check signal supplied to
IC201 pin 11, 14
Check the “LOW ” of
Q208, 209 ”B” Check the “LOW ” of
IC601 pin32
Check the Oscillation of
L201 pin1, 3
Replace the deck
Check the power
supplying to C245(+)
Check the “LOW ”
Q813 “C”
Check the IC601
pin87
Check the DC output
of Q811 “C”
Check the Oscillation of
Q202 “E ”
Check the signal of
R239, R240
Check the pattern
Check the 0.6V of
Q203 “B ”
Replace the L201
Replace Q208, 209
YES
YES
YES
YES
YES
YES
YES
NO NO
NO
NO
NO
NO
NO
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- 2-17 -
❏VOLTAGE SHEET
1 2 3 4 5 6 7 8 9 10 11 12
0V 0V 1.3V 1.3V 1.4V 1.7V 0V 4.5V 2V 1.3V 0V 0V
13 14 15 16 17 18 19 20 21 22 23 24
0.8V 0V 1.3V 2V 1.4V 7.8V 7.5V 4V 1.3V 1.3V 0V 0V
1 2 3 4 5 6 7 8
0V 0V 0V 5V 0V 7.8V 0V 0V
• IC201
1 2 3 4 5 6 7 8 9 10 11 12
3.9V 4.1V 4.1V 4.1V 4.1V 3.9V 4.1V 4.1V 4.1V 4.1V 4.1V 4.1V
13 14 15 16 17 18 19 20 21 22 23 24
4.1V 4.1V 4.1V 0V 0V 4.1V 4.1V 0V 0V 0V 4.1V 8.2V
25 26 27 28
0V 3.4V 3.4V 4.1V
• IC301
1 2 3 4 5 6 7 8 9 10 11 12
0V 0V 0V 0V 3.3V 0V 0V 0V 0V 0V 0V 0V
13 14 15 16 17 18 19 20 21 22 23 24
0V 3.3V 3.3V 0V 0V 0V 0V 0V 0V 0V 0V 0V
25 26 27 28 29 30 31 32 33 34 35 36
0V 0V 0V 1.5V 1.5V 0V 0V 0V 0V 0V 1.6V 0V
37 38 39 40 41 42 43 44 45 46 47 48
1.7V 0V 3.3V 1.6V 1.6V 1.6V 1.6V 1.6V 1.6V 3.2V 0V 0V
49 50 51 52 53 54 55 56 57 58 59 60
0V 3.2V 0.8V 1.6V 1.6V 3.2V 1.4V 1.4V 0V 1.6V 0V 1.6V
61 62 63 64 65 66 67 68 69 70 71 72
3.2V 0V 0V 0V 0V 0V 1.5V 0V 0V 0V 0V 2.5V
73 74 75 76 77 78 79 80 81 82 83 84
0.25V 2.7V 0.25V 0V 0V 0V 1.6V 0V 2.7V 3.2V 0V 1.2V
85 86 87 88 89 90 91 92 93 94 95 96
1.6V 3.2V 1.6V 0V 0V 0V 0V 0V 0V 0V 0V 0V
97 98 99 100
0V 3.2V 0V 0V
• IC501
1 2 3 4 5 6 7 8 9 10 11 12
10.7V 6.1V 11V 5.8V 0.4V 0V 0V 0.7V 0V 9.1V 10.8V 12V
• IC302
• IC202
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