LG LPC-LM530A, LPC-LM535A Service manual

- 1-1 -

[CONTENTS]

❍ SECTION 1. GENERAL

• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

• IDENTIFICATION OF CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

❍ SECTION 2. ELECTRICAL

• ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• TROUBLESHOOTING GUDIE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

• IC VOLTAGE SHEET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17

• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19

• SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21

• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37

❍ SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

❍ SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

- 1-2 -

SECTION 1. GENERAL

❏ SPECIFICATIONS

MODEL LPC-LM530A/X

SECTION LPC-LM535A/X

Power supply Refer to the back panel of the unit.
Power consumption 20W
Mass 2.75kg
External dimensions (W x H x D) 550 x 290 x 220mm
Output Power 7.5W x 2
Speakers 8Ω x 2
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

- 1-4 -

Remote Control

POWER XDSS

TUNER/BAND EQ PATT.

VOLUME

PRESET

REPEAT

SLEEP

PROGRAM

SURR. MUTE

12

5436

9870

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

• CD STOP ( ) 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

Display Window

REC

REPEAT

FLAT

XDSS SURR

CLASSIC POP

ROCK

1 ALL

SYNC SLEEP PROG STEREO

MP3 TIMER

MEMORY

1 2 3 4 5 6 7 8 9 10

11

12
13

14

1516 17

- 2-1 -

SECTION 2. ELECTRICAL

❏ ADJUSTMENTS

1. TAPE DECK ADJUSTMENT

DECK MODE TEST TAPE TEST POINT ADJUSTMENT ADJUST FOR DECK ADJUST

BLAY BACK MTT-114

SPEAKER OUTPUT

Azimuth adjusting screw L/R Maximum

STOP FWD: LEFT
RVS

FWD:RIGHT
RVS: LEFT

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 60kHz±5kHz

- 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?

CHECK PN50 1 PIN 1 4,1 5

(TA+,TA-)

CHECK PN503 PIN5.6

(SP+,SP-)

CHECK PN50 1 PIN 1 0(LD)

CHECK PN50 1 PIN 1 5.1 6

(FA-,FA+)

CHECK PN503 PIN3.4

(SL+,SL-)

DEFECTIVE PICK UP OR

IC503 OR IC501 OR IC502

DEFECTIVE PICK UP OR

IC503 OR IC501

DEFECTIVE PICK UP OR

IC502

DEFECTIVE PICK UP OR

IC503

DEFECTIVE PICK UP 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 PICK UP

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 PICK UP

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 PICK UP

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 PICK UP

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 PICK UP

OR IC502

DEFECTIVE PN503

CONNECTOR

DEFECTIVE PICK UP

SPINDLE MOTOR

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 Troubleshooting”

Check the signal input of PN302 “R-CH”“L-CH”

Refer to “TAPE Troubleshooting”

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 TROUBLESHOOTING6. 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

NONO

• 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

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

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