MODEL: LPC-LM735X/LPC-LM535X
SERVICE MANUAL
P/NO : AFN31625655
OCTOBER, 2006
MP3/CD CASSETTE
SERVICE MANUAL
MODEL: LPC-LM735X
LPC-LM535X

-1-1-
[CONTENTS]
SECTION 1. GENERAL
•SPECIFICATIONS.......................................................1-2
•IDENTIFICATIONOFCONTROLS...........................................1-3
SECTION 2. ELECTRICAL
•ADJUSTMENTS.........................................................2-1
•TROUBLESHOOTINGGUDIE..............................................2-2
•ICVOLTAGESHEET....................................................2-17
•BLOCKDIAGRAM......................................................2-19
•SCHEMATICDIAGRAM...................................................2-21
•PRINTEDCIRCUITDIARGAMS............................................2-29
•WIRINGDIAGRAM......................................................2-37
 SECTION3.EXPLODEDVIEWS...................................3-1
 SECTION4.REPLACEMENTPARTSLIST...........................4-1

-1-2-
SECTION 1. GENERAL
SPECIFICATIONS
MODEL
LPC-LM735A/X
SECTION
Power supply
Refer to the back panel of the unit.
Power consumption
30W
Mass
2.75kg
External dimensions (W x H x D) 550 x 290 x 220mm
Output Power
7.5Wx2
Speakers
8Ωx2
Battery Operation
DC 12V, eight "D"(R20) 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.

-1-3-
IDENTIFICATION OF CONTROLS
FRONT/REAR PANEL
14
15
16
17
18
19
2
11
10
3
13 12
8
1
4
6
5
7
9
1. POWER (STANDBY/ON) button
2. CD SYNC. button
3. FUNCTION SELECT buttons (CD/TAPE)
LEFT/RIGHT SPEAKER
4. • TAPE MODE button :
• COUNTER RESET button :
• TIMER button
• CLOCK button
• COUNTER button :
5. XDSS button
6. CD DOOR
7. REMOTE SENSOR
8. DISPLAY WINDOW
9. CD OPEN/CLOSE ( OPEN/CLOSE) button
10. • PROG./MEMORY button
• FUNCTION SELECT button (TUNER/BAND)
11. VOLUME ( ) button
12. TAPE DOOR ( PUSH EJECT)
13. • RECORD/RECORD PAUSE ( ) button
• CD SKIP/SEARCH (
) button
• TAPE REWIND/FAST FORWARD (
)
button
• PRESET (-/+) button
• TAPE REVERSE PLAY ( ) button
• TAPE PLAY ( )/CD PLAY ( ) button
• STOP ( )/CLEAR button
14. FM ANTENNA
15. MICROPHONE : OPTIONAL
16. BATTERY COMPARTMENT
17. HEADPHONE SOCKET ( PHONES) -
ø 3.5mm : OPTIONAL
18. AC POWER INPUT SOCKET
19. VOLTAGE SELECTOR : OPTIONAL

-1-4-
POWER XDSS
TUNER/BAND EQ PATT.
VOLUME
PRESET
REPEAT
SLEEP
PROGRAM
SURR. MUTE
12
5
4
36
9
8
70
OPTIONAL
1
2
3
4
5
6
14
13
12
11
10
9
8
7
1. XDSS button
2. POWER button
3. TUNER/BAND button
4. This button is not available.
5. PRESET ( ) button
6. CD FUNCTION buttons
• PLAY/PAUSE ( ) button
•CDSTOP( )button
• CD SKIP/SEARCH (
) button
• REPEAT button
7. NUMBER buttons
8. TAPE FUNCTION buttons
• RECORD/RECORD PAUSE button ( )
• BACKWARD PLAY button ( ) : OPTIONAL
• FORWARD PLAY ( ) button
• TAPE STOP button ( )
• FAST FORWARD ( ) button
• REWIND ( ) button
9. SLEEP button
10. PROGRAM button
11. VOLUME ( ) button
12. EQUALIZER PATTERN (EQ PATT.) button
13. MUTE button
14. SURROUND (SURR.) button
1. RECORD/RECORD PAUSE indicator
2. MP3 indicator
3. SLEEP indicator
4. TIMER indicator
5. PROGRAM indicator
6. MEMORY indicator
7. STEREO indicator
8. BACKWARD PLAY indicator
9. TAPE MODE indicator
10. FORWARD indicator
11. CD SYNCHRO RECORDING indicator
12. CD PLAY/PAUSE indicator
13. XDSS indicator
14. Equalizer indicator
15. Surround indicator
16. CD REPEAT indicator
17. • VOLUME indicator
• SOUND LEVEL METER
REC
REPEAT
FLAT
XDSS SURR
CLASSIC POP
ROCK
1 ALL
SYNC SLEEP PROG STEREO
MP3 TIMER MEMORY
12345678910
11
12
13
14
15 16
17

-2-1-
SECTION 2. ELECTRICAL
ADJUSTMENTS
1. TAPE DECK ADJUSTMENT
DECK MODE TEST TAPE TEST POINT ADJUSTMENT
ADJUST FOR
BLAY BACK MTT-114
L/R Output
Azimuth adjusting screw L/R Maximum
2. RECORD BIAS ADJUSTMENT
DECK MODE TEST TAPE TEST POINT ADJUSTMENT
ADJUST FOR
REC MODE MTT-5511 C241
L201
AUTO-RVS 85kHz±5kHz
AUTO-STOP

-2-2-
TROUBLESHOOTING GUIDE
1. CD

-2-3-
• OPEN COLOSE NG
CONNECTOR LOCKING CHECK (PN508,PN507)
DEFECTIVE MAIN
POWER SUPPLY
DEFECTIVE MICOM
DEFECTIVE IC503
DEFECTIVE MICOM
MECHANISM
CHECK POWER SUPPLY CIRCUIT (PN508,PN507)
PN508 PIN 8 = 6.2V,PIN 7 = 5V,PN507 PIN 1 = 5V
CHECK VOLTAGE CHANGE LO+, LO- OF IC503
(PN507, PIN OPEN:1 2, CLOSE:1 3)
CHECK VOLTAGE CHANGE OF OPEN CLOSE,
AND BTLMUTE VOLTAGE(=5V)
(PN507 PIN 1 2:OPEN, 1 3:CLOSE, 1 4:BTLMUTE)
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(PN50 1 ,PN503)
DOES SLED MOVE?
DOSE LENSE MOVE?
(UP&DOWN)
DOSE LASER LIGHT?
DOES SPINDLE ROTATE?
IS READING OK?
CHECKPN501PIN14,15
(TA+,TA-)
CHECK PN503 PIN5.6
(SP+,SP-)
CHECK PN50 1 PIN 1 0(LD)
CHECKPN501PIN15.16
(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 1 4 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 IC50
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 1 6)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 IC50 1
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 1 2 AND
PN503 PIN6)WAVEFORM #4
SPINDLE MOTOR DRIVE WAVE
DOSE SPIN WAVEFORM
APPEAR AT (IC503 PIN6)
WAVEFORM #4
SPINDLE DRIVE WAVE
YES
YES

-2-10-
• READING OK CHECK #E(="NO DISC" DISPLAY)
E
DOSE TA+ WAVEFORM
APPEAR AT(IC503 PIN 17 AND
PN503 PIN 15)WAVEFORM #5
TRACKING COIL DRIVE WAVE
DOSE TAIN WAVEFORM
APPEAR AT (IC503 PIN23)
WAVEFORM #5
TRACKING DRIVE WAVE
DEFECTIVE IC503
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

-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 +10V
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

-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 pin6,23
Check the signal input of IC301 pin3,26
Check the signal input of IC301 pin4,25
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

-2-13-
5. IC301 TROUBLESHOOTING
Check the IC601 Function Selector
Check the Pattern
Replace the IC301
Replace the ZD 302
Replace the Q301
Check the IC601
END
Check the Power supplying to
IC301 pin 1
Check the +8.2V DC
output ZD302
Check the +7.5V DC
Output Q301 "E "
Check the DC Output of
Q814, ZD806
Check the Data of
IC601 pin 3,4
(CD TAPE Function)
Check the CLK Data of
IC301 pin 14,15
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES

-2-14-
6. TUNER PACK TROUBLESHOOTING
Check the Tuner Power of
PN101 "Tu- B+"
Check the DC output of
Q818 "C"
Check the "high"
Q819 "B "
Check the DC output
Q802 "E "
Replace Tuner pack
CE : Chip Emable
DI : Data Input(From u-com)
DO : Data Output(to u-com)
CLK : Tuner Mode Clock
Check the PN101 of
CE, DI, DO, CLK (PLL)
Is the normal?
END
YES
YES
YES
YES
NO
NO
NO

-2-15-
7. TAPE TROUBLESHOOTING
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
NO
NO
• Play

-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
pin88
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

-2-17-
VOLTAGE SHEET

-2-18-

BLOCK DIAGRAM
2-19
2-20

2-21
2-22
SCHEMATIC DIAGRAMS
1. MAIN SCHEMATIC DIAGRAM (POWER/EQ/AMP)

2-23
2-24
2. FRONT/MICOM SCHEMATIC DIAGRAM

2-25
2-26
3. DECK SCHEMATIC DIAGRAM

2-27
2-28
4. CDP SCHEMATIC DIAGRAM

2-29
2-30
PRINTED CIRCUIT DIAGRAM
1. MAIN P.C. DIAGRAM (COMPONENT SIDE)

2-31
2-32
1. MAIN P.C. DIAGRAM (SOLDER SIDE)

2-33
2-34
2. CD P.C. DIAGRAM (COMPONENT SIDE)
2. CD P.C. DIAGRAM (SOLDER SIDE)

2-35
2-36
3. KEY P.C. DIAGRAM
4. BATTERY/POWER P.C. DIAGRAM

2-37
2-38
WIRING DIAGRAM

3-1
3-2
SECTION 3. EXPLODED VIEWS
A00
293
290
A46
351
285
A26
450
A41
A47
453
280
452
452
452
281
282
286
291
292
252
260
450
274
453
261
264
450
265
A42
451
451
275
270
272
273
271
260
453
250
261
259
259
258
257
254
253
256
251
255
256A
3
0
5
NOTE) Refer to "SECTION 4 REPLACEMENT
PARTS LIST" in order to look for the
part number of each part.

3-3
3-4
MEMO
MEMO