LG TCH-600 Service Manual Datasheet

- 1-1 -

❍

SECTION 1. SUMMARY

• SERVICING PRECAUTIONS

..........................................................................................................

1-2

• ESD PRECAUTIONS

.......................................................................................................................

1-3

• SPECIFICATIONS

...........................................................................................................................

1-4

❍

SECTION 2. ELECTRICAL

• ADJUSTMENTS

..............................................................................................................................

2-1

• ELECTRICAL TROUBLESHOOTING GUIDE

.................................................................................

2-1

• WAVEFORMS OF MAJOR CHECK POINT

....................................................................................

2-1

• INTERNAL BLOCK DIAGRAM of ICs

..............................................................................................

2-7

• BLOCK DIAGRAM

.........................................................................................................................

2-29

• SCHEMATIC DIAGRAM

................................................................................................................

2-31

• MAIN SCHEMATIC DIAGRAM

......................................................................................................

2-33

• CDP SCHEMATIC DIAGRAM

.......................................................................................................

2-35

• PRINTED CIRCUIT DIAGRAM

......................................................................................................

2-37

❍

SECTION 3. CABINET MAIN CHASSIS & MECHANISM

• EXPLODED VIEW

...........................................................................................................................

3-1

❍

SECTION 4. REPLACEMENT PARTS LIST

...................................................................

4-1

[CONTENTS]

- 1-2 -

❏ SERVICING PRECAUTIONS

➊ Always disconnect the power source before:

1) Removing or reinstalling any component, circuit board, module or any other instrument assembly.

2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection.

3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument.

CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in

an explosion hazard.

➋ Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service

manual might be equipped.

❸ Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state

device heat sinks are correctly installed.

❹ Always connect a test instrument’s ground lead to the instrument chassis ground before

connecting the test instrument positive lead. Always remove the test instrument ground lead last.

1) The service precautions are indicated or printed on the cabinet, chassis or components. When servicing,
follow the printed or indicated service precautions and service materials.

2) The Components used in the unit have a specified conflammability and dielectric strength. When
replacing any components, use components which have the same ratings. Components marked in
the circuit diagram are important for safety or for the characteristics of the unit. Always replace with the
exact components.

3) An insulation tube or tape is sometimes used and some components are raised above the printed writing
board for safety. The internal wiring is sometimes clamped to prevent contact with heating components.
Install them as they were.

4) After servicing always check that the removed screws, components and wiring have been installed
correctly and that the portion around the service part has not been damaged. Further check the insulation
between the blades of attachment plug and accessible conductive parts.

SECTION 1. SUMMARY

- 1-3 -

❏

ESD PRECAUTIONS

[Electrostatically Sensitive Devices (ESD)]

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such omponents
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are
integrated circuits and some field-effect transistors and semiconductor chip components. The following
techniques should be used to help reduce the incidence of component damage caused by static electricity.

1) Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and
wear a commercially available discharging wrist strap device, which should be removed for potential
shock reasons prior to applying power to the unit under test.

2) After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive
surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3) Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4) Use only an anti-static solder removal device. Some solder removal devices not classified as “anti-static”
can generate electrical charges sufficient to damage ESD devices.

5) Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.

6) Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together
by conductive foam, aluminum foil or comparable conductive material).

7) Immediately before removing the protective material from the leads of a replacement ESD device, touch
the protective material to the chassis or circuit assembly into which the device will be installed.

CAUTION: Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8) Minimize bodily motions when handling unpackaged replacement ESD devices. (Otherwise harmless
motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor
can generate static electricity sufficient to damage an ESD device).

[CAUTION. GRAPHIC SYMBOLS]

THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL
TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE
OF UNINSULATED “DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT
MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO
ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY
INFORMATION IN SERVICE LITERATURE.

- 2-1 -

❏ ADJUSTMENTS

1. Test & Adjustment point

Figure 1. MAIN PCB Board

Figure 2. BEFORE RF PCB Board

L204

L255

L205

L254 T201 T202 T256 T206

T101

RV101

A

B

C

SECTION 2. ELECTRICAL

- 2-2 -

( NEW RF P.C. BOARD)

Figure 3. NEW RF PCB Board

- 2-3 -

2. FM Adjustment

Figure 4.

(1) The impedance of FM antenna terminal is 75Ω.

Therefore, connect coaxial cable (3C-2V etc.) between FM SG and antenna terminal when wiring.

(2) There are two kind in indication of FM SG output attenuator.

1) Attenuator with Marking of 75Ω open...open indication type

2) Attenuator with marking of 75Ω load or close...load or close indication type.

(3) FM SG output level in this FM adjustment are described as open indication type. The up table shows

relations among FM SG attenuator indication(dB), available power ratio(dBf) and antenna terminal
voltage(dB/µV) in each indication type.

Notes:

1. BAND Switch ········································································································································ FM

2. BALANCE ······································································································································· Center

3. TREBLE/BASS ································································································································ Center

4. Connect as shown in figure 3.

5. Refer to figure 1~2 for Adjustment Points.

Item FM SSG Attenuator Available Antenna

Type Indication Power Ratio Terminal Voltage

Open indication type 0dB 5.2dBf 6dB/µV

60dB 65.2dBf 66dB/µV

Load or close 0dB 11.2dBf 12dB/µV

indication type 54dB 65.2dBf 66dB/µV

FEED SIGNAL

STEP SUBJECT

FROM TO

MEASURE OUTPUT ADJUSTMENT ADJUST FOR

1 Discriminator 98MHz 60dB ANT Jack Between Point XX & Point T101 DC 0V±10mV

22.5kHz Dev. or XX, DC Volt Meter.
1kHz FM SSG Point XX

2 MPX 98MHz 60dB Same as Channel speration RV101 30dB

Adjustment

75kHz Dev.1kHz

above

FM SSG

A

B

C

Stereo modulator

AUDIO OSC

SSG

GND

(Black Lead)

PRE OUT

(Red Lead)

(Yellow Lead)

Power Supply

OUT

EXT
MODE

ANT

Jack.

VTVM SCOPE

IN OUT

Unit

- 2-4 -

3. AM(MW) Adjustment

Notes:

1. BAND Switch ··································································································································· AM(MW)

2. Connect as shown in figure 4.

3. Refer to figure 1~2 for Adjustment Points.

Figure 5.

FEED SIGNAL

STEP SUBJECT

FROM TO

MEASURE OUTPUT ADJUSTMENT ADJUST FOR

1 520 or 522kHz No Input LCD Display TUNE +/- Button 520 or 522kHz

(Reception Frequency)

Tuning Voltage Between Point XX and GND, L206 DC 1.2V±0.05V
Adjustment DC Volt Meter

2 IF Coil 600kHz or ANT Jack Output L or R ch, T201 & T202 Max. Output

Adjustment 603kHz ANT or PointXX VTVM & Oscilloscope

input, 30dB,
400Hz (30%
MOD) SSG.

3 600kHz or 600kHz or Same as LCD Display TUNE +/- Button 600 or 603kHz

603kHz 603kHz ANT above (Reception Frequency)
RF Adjustment input, 30dB,

400Hz (30%

Output L or R ch, L204 & L205 Max. Output

MOD) SG.

VTVM & Oscilloscope

A

B

- 2-5 -

4. LW Adjustment(Optional)

Notes:

1. BAND Switch ··········································································································································· LW

2. Connect as shown in figure 5.

3. Refer to figure 1~2 for Adjustment Points.

Figure 6.

FEED SIGNAL

STEP SUBJECT

FROM TO

MEASURE OUTPUT ADJUSTMENT ADJUST FOR

1 144kHz No Input LCD Display TUNE +/- Button 144kHz

(Reception Frequency)

Tuning Voltage Between Point XX and GND, L256 DC 1.2V±0.05V
Adjustment DC Volt Meter

2 150kHz 150kHz ANT Jack LCD Display TUNE +/- Button 150kHz

RF Adjustment ANT input, or PointXX (Reception Frequency)

30dB, 400Hz
(30% MOD)

Output L or R ch, L254 & L255 Max. Output

SSG.

VTVM & Oscilloscope

A

B

- 2-6 -

❏ ELECTRICAL TROUBLESHOOTING GUIDE

Any Key power on.

Is power turnd on?

DISC loading?

Does initial reading occur?

Can disc be played?

Is audio output supplied?

Check power supply circuitry.

Q808, Q809, Q802, IC401,

PIN13

Check loading supply circuitry.

Q505, Q506, Q507, IC401, CN505

Check laser circuitry.

Q501, IC501, IC503, IC504

Check focusing circuitry.

IC501, IC503

Check DISC.

Check tracking servo circuitry.

IC501, IC503

Check audio circuitry.

IC501, IC401, IC601, IC801

OK

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

(1) No Power.

- 2-7 -

YES

YES

YES

YES

YES

YES

(2) LCD light abnornal.

Any Key power on.

(without DISC)

Do display LCD then light?

Check voltage in the power

supply circuitry.

Power supply circuitry

defective.

Q802, Q807, Q808, Q809

Reset circuit defective.

Q803,Q804 Surrounding

circuit defective.

X401, C410, C411 defective.

Q807, CN802 front PCB

pattern defective.

IC401, Pin45~48 front PCB

pattern defective.

IC901, Surrounding circuit

PCB pattern defective.

Is u-com IC401 reset circuit

normal? Pin53

Is u-com IC401 keyin Pin17, 18

5volt input?

Is u-com IC401 Pin45, Pin48

output waveform normal?

Is IC901 Com1, Com2, Com3

output waveform normal?

Display LCD connector defective.

Is u-com IC401X1, X2 terminal

pin 57.58 input?

OSC : 7.2MHz

NO

NO

NO

NO

NO

NO

NO

- 2-8 -

(3) Initial reading is not carried out.

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES

YES (with disc)

YES

YES

Slide motor moves

(Without disc)

Spindle motor turns

Does RF waveform appear?

IC501 Pin7

Check the Data transmission from

PN505 PIN7,8,20 to CD DSP

Check the Data transmission from

PN505 PIN19 to MICOM

Check the change of

SLPWMF Voltage

(IC503 PIN23)

Check the change of SL +,

SL - Voltage

(IC503 pin 13, 14)

Check the Voltage change of PN 505

PIN15 (7.5V)

Check the Voltage IC 501 PIN12

(1.4V~1.8V)

Defective connector

PN505

Defective IC 501

Defective connector

PN505

Defective MICOM

Defective connector

PN505

Defective IC501

Defective IC501

Defective IC503

Defective contact PN502

Defective PICK-UP

Laser light check A ?

focus coil drive wareform.

TRACKING ERROR wareform

Is rotation normal?

Defective IC501

Defective PICK-UP

Is there no dropout of RF signal?

Does FA+ waveform appear at

IC503 pin15?

Does TE waveform appear at

IC501 pin 11?

- 2-9 -

NO

NO

NO

NO

NO

NO

When laser does not light.

Is “2.4V~3.4V” applied to pin 19 of IC 501?

( ➀ 3.4V ➁ 2.4V)

Is power supplied to laser Q501?

(Q 501 collector: about 1.8V)

Does laser current flow?

1.0V across R555

Is data transferred from
MICOM IC ?

Does voltage appear at IC
503 pin 13, 14?

Defective MICOM.

Defective MICOM.

Defective connector. (PN 501)

Defective IC 501, 503

Defective slide motor and/or
connector.

Defective LMT SW and/or
connector. (PN 502)

Defective Q 501 and/or laser.

Defective laser and/or
connector. (PN 501)

Did pickup return to

innermost circular?

Does it stop at inner pick
circular after shift?

Is defect output from LMT
SW applied to pin of
PN505?

R555 »1.0V

R555 «1.0V

YES

YES

YES

YES

OPEN

CLOSE

YES

YES

YES

YES

YES

YES

A

2

OV

- 2-10 -

When laser light.

B

When SPINDLE motor dose not turn

C

NO

NO

NO

NO

YES

YES

YES

YES

Laser lights

Check the signal of

FOCUS SEARCH

(IC503 Pin 26)

Chekc the signal of IC503

pin 15, 16

Does FE signal appear?

(IC501 pin 9)

Does DRF signal appear? (IC 501 pin67)

Defective IC501

Defective IC503

Open activator and/or

connector

(PN501)

Degraded laser diode

Defective PICK-UP

YES

NO

NO

YES

Check the change of

SPPWMF Voltage

(IC503 pin26)

Check the change of SP +,

SP -, Voltage

(IC503 pin 11, 12)

Defective IC501

Defective IC503

Defective contact PN502

Defective PICK-UP

- 2-11 -

(CH1)

(CH2)

❏ WAVEFORMS OF MAJOR CHECK POINT

1. HF signal (RF signal ) waveform
(IC501 pin 7) during normal play

2. EFM signal (IC501 pin 6)waveform
during Normal Play

3. Focus coil drive waveform(IC503 pin15)

• When focus search failed or there is no disc on the tray

• Focus coil drive waveform(IC503 pin26) and DRF(IC501
pin67) when focus search is accomplished

4. Tracking coil drive waveform and TE during track
traverse
(1) When time division is 20mS/Div.1V/Div.

(2) When time division 1mS/Div, 1V/Div

(During forward track traverse)

(3) When time division is 0.5nS/div.

(During backward Track Traverse)

5. Feed motor drive waveform(IC 503 pin14)
During normal play

CH1 : FOCUS COIL DRIVE

SIGNAL 2V/Div.

CH2 : DRF

CH1 : TRACKING COIL DRIVE

SIGNAL 2V/Div. (IC503 pin17)

CH2 : TRACKING ERROR(TE: IC501 pin11)

1V/Div.

(

(

(

CH1 : TRACKING COIL DRIVE (IC503 pin17)

SIGNAL 2V/Div.

CH2 : TRACKING ERROR (TE: IC501 pin11)

1V/Div.

(

CH1 : TRACKING COIL DRIVE (IC503 pin17)

CH2 : TRACKING ERROR (TE: IC501 pin11)

(

0.5V/Div.
500nS/Div.

(

1S/Div.
1V/Div.

(

1mS/Div.
1V/Div.

(

0.5V/Div.
5µS/Div.

(

2S/Div.

0.5V/Div.

OV

OV

OV
(CH1)

(CH2)

(CH1)

(CH2)

(CH2)

OV

OV

OV

OV

OV

OV

OV

OV

OV

- 2-12 -

❏

INTERNAL BLOCK DIAGRAM of ICs

■ IC101 LA1140

■ IC102 KIA6010SN

■ IC103 LA3430M

- 2-13 -

NOTE: Mark terminals are not existence in KIC9256P, KIC9256F

Terminal name of KIC9256P, KIC9256F is shown in parentheses.
Others are common terminals.

■ IC104 KIC9256P

POWER ON

RESET

TRI-STATE

BUFFER

TRI-STATE

BUFFER

RESET

PHASE

COMPARATOR

OSC
CIRCUIT

24bit REGISTER

ADDRESS
DECODER

20bit BINARY COUNTER

UNIVERSAL COUNTER CONTROL

OUTPUT PORT

24bit REGISTER

4

FM

1mS

OSC

MODE LF

4

UNLOCK

1/0 PORT

8

TEST

24 22

5

5

10

12 bit PROGRAMMABLE COUNTER

MAX

12

15

4

OT4

DO1

DO2
(DO2/OT-4)

1/0-5/CLK

1/0-6

1/0-9 IF

IN2

(1/0-6 IF )

IN2

1/0-8 IF

IN1

1/0-7 SC

IN

(1/0-5 IF )

IN1

4

15

129

16

13

14

8

OT-4

OT-2

OT-3

OT-4

OT-1

XT 1mS

GATE

AMP

AMP

7

6

3

4

5

1

2

10

11

1/2

FM

FM

PSC

V

DD

GND

AMP

HF

FM

IN

AM

IN

XT

XT

DATA

CLOCK

PERIOD

S

L

2 MODULUS
PRESCALER

4 bit SWALLOW

COUNTER

REFERENCE COUNTER

24bit SHIFT REGISTER

■ IC201 DBL 1019

LOCAL
OSC
BUFFER

LOCAL
OSC

RF
AGC

ATTENUATOR

DRIVER

MIX

IF

AMP

IF

DETECTOR

RF

AMP2

RF

AMP2

IF
AGC

SIGNAL
METER

ALC

RF DETECTOR

20 19 18 17 16 15 14 13 12 11

12345678910

Local OSC
Butter Out

RFAGC

Out

RFAmp2InRF

AGC

GND MIX in &

RF AMP1 In

MIX
Out

IF AmpInIF Amp

Out

ANT Damping

Driver

Local
OSC2

Local
OSC1

Signal

Meter Out

Signal

Meter In

Detector

Out

Detector

InGND

V

CC

V

CC

IF
AGC

- 2-14 -

■ IC401 LCD875747B

484746454443424140

39

3837363534

33

49
50
51
52
53
54
55
56
57
58

59
60
61
62
63
64

123456789

10

1112131415

16

(I) PCD_WRQ P70/INT0/T0LCP/AN8

N.C P71/INT1/T0HCP/AN9

N.C P72/INT2/T0IN

(I) PCDCBUS

P73/INT3/T0IN

RES#

(I) PSDIN XT1/AN3

XT2
VSS1

CF1
CF2

VDD1

(I) PACCIN P80/AN0

(I) PCDCTX P81/AN1
(O) PCD_CE P82/AN2
(O) PCD_DO P10/SO0

(I) PCD_DI P11/SI0/SB0

(O) PCD_CL P12/SCK0

(O) PCDCON P13/SO1

(I) PVOLA P14/SI1/SB1

(I) PVOLB P15/SCK1

(O) PLED P16/T1PWML

(O) PBEEP P17/T1PWMH/BUZ

PWM1

PWM0

VDD2

VSS2

N.C P00

(O) PPWR_MUTE P01

(O) PPOWER P02

N.C P03/AN3

(I)PEJT_KEY P04/AN4

(I) PKEY1 P05/AN5

PB2/D2 (I) PDIOIN2
PB3/D3 (O) PDIOOUT0
PB4/D4 (O) PCD_RESET
PB5/D5 (O) PCD_POWER
PB6/D6 (O) PEVCLK

PA5/RS (O) PFSO

PA4/RD# (O) PFINH

PA3/WR# (O) PFCE

PA2/CS0# (O) PFCLK

PC0/A0 (O) PPLLCE

PC1/A1 (O) PPLLCLK

PC2/A2 (O) PPLLDATA

PC3/A3 (O) PAGC

PC4/A4 N.C

PC5/A5 (I) PSTIN

PC6/A6 (O) PCD_AMUTE

PC7/A7 (O) PCD_MUTE

VDD3

VSS3

PB0/D0 (I) PDIOIN0

PB1/D1 (I) PDIOIN1

IC401

LC875747B

P23/INT4/T1IN (O) PCD_WOK
P22/INT4/T1IN (I) PCD_CNTOK
P21/INT4/T1IN (I) PCD_OVF
P20/INT4/T1IN (I) PCD_FSEQ
P07/AN7 (I) PLEVEL
P06/AN6 (I) PKEY2

32
31
30
29
28
27
26
25
24
23

PB7/D7 (O) PEVDATA
P27/INT5/T1IN (I)PMECHA_SW1
P26/INT5/T1IN (I)PCD_DRF
P25/INT5/T1IN (I)PMECHA_SW2
P24/INT5/T1IN (I)PLIMIT_SW

22
21
20
19
18
17

- 2-15 -

■ PIN Function

①②③

④

①②③

④

①

②

③

④

- 2-16 -

- 2-17 -

- 2-18 -

■ IC501 LC78647N

- 2-19 -

■ Block Diagram

- 2-20 -

■ PIN Function table

Pin

Pin Name I/O

State after

Function

No. Reset

1 JITTC A — Jitter detection capacitor connection pin jitter detection capacitor connection pin
2 ADAVDD — — Servo A/D, D/A power supply pin
3 ADAVSS — — Servo A/D, D/A ground pin. Must be connected to 0V.••0V •••••ƒ•••
4 SLCO AO — Slice level control charge pump output pin
5 SLCIST AI — Slice level control charge pump current setting resistance connection pin
6 EFMIN I — RF signal input pin
7 RF AO ZHI RF signal output pin
8 RFVDD — — RF power supply pin

9 FE AO ZHI FE signal monitor pin
10 TEC AO — TE signal LPF capacitor connection pin
11 TE AO ZHI TE signal monitor pin
12 VREF AO RFVDD /2 VREF voltage output pin
13 REFI AI — VREF reference voltage monitor pin
14 TIN1 AI — E signal input pin
15 FIN1 AI — A+C signal input pin
16 FIN2 AI — B+D signal input pin
17 TIN2 AI F signal input pin
18 RFVSS — — RF ground pin. Must be connected to 0V.
19 LDD AO — Laser power control signal output pin
20 RFMON AO ZHI RF internal signal monitor pin
21 LDS AI • Laser power detection signal input pin
22 TEST I • Test input pin. Must be connected to 0V.
23 SBCK/FG I — Subcode read clock input pin / FG signal input pin

Set pin function with a command. When not used, connect to 0V.
24 DEFECT O L Defect signal monitor pin
25 V/PB O H Rough servo/phase control automatic switching monitor output pin. “H”: Rough

servo, “L”: Phase servo
26 FSEQ O L Synchronization signal detection output pin

“H” when synchronization signal detected from EFM signal and internally generated

synchronization signal match.
27 FOPWMF O L Focus PWM output pin
28 FOPWMR O L Focus PWM output pin
29 TRPWMF O L Tracking PWM output pin
30 TRPWMR O L Tracking PWM output pin
31 SPPWMF O L Spindle PWM output pin
32 SPPWMR O L Spindle PWM output pin
33 SLPWMF O L Thread PWM output pin
34 SLPWMR O L Thread PWM output pin
35 PWMCK O L PWM carrier frequency output pin
36 VSS — — Digital ground pin. Must be connected to 0V.
37 VDD1 — — Digital power supply pin
38 VDD3 — — Microcomputer I/F power supply pin
39 MONI1 O L Internal signal monitor pin 1
40 MONI2 O L Internal signal monitor pin 2
41 DOUT O • Digital OUT output pin (EIAJ format)
42 MONI3 O L Internal signal monitor pin 3
43 MONI4 O L Internal signal monitor pin 4
44 MONI5 O L Internal signal monitor pin 5

- 2-21 -

PinNo

Pin Name I/O

State after

Function

No. Reset

45 LVDD — — L channel power supply pin
46 LCHO AO LVDD /2 L channel output pin
47 LVSS — — L channel ground pin. Must be connected to 0V.
48 RVSS — — R channel ground pin. Must be connected to 0V.
49 RCHO AO LVDD /2 R channel output pin
50 RVDD — — R channel power supply pin
51 XVDD — — Crystal oscillation power supply pin
52 XOUT O Oscillation
53 XIN I Oscillation
54 FSX/16MIN I/O Input mode 7.35 kHz synchronization signal output pin, or DF/DAC external clock input pin
55 XVSS — — For crystal Crystal oscillation ground pin. Must be connected to 0V.

oscillation

56 16MOUT O CLK output 16.9344 MHz output pin
57 C2F/EFLG O H C2 flag output pin (in reset). C1, C2 correction monitor pin
58 LRSY O L L/R clock output pin
59 DATACK O L Bit clock output pin
60 DATA O L L/R channel data output pin
61 CE I — Chip enable signal input pin
62 CL I — Data transfer clock input pin
63 DI I — Data input pin
64 DO O (H) Data output pin (Nch open-drain output)
65 WRQB O H Interrupt signal output pin
66 RESB I — LC78647NT IC reset input pin. Drive to “L” level at power-on.
67 DRF O L Focus ON detection pin
68 WOK/

I —

DRAM write enable signal input. “H”: Write enabledL/R clock input pin

ASLRCK

69 OVF/

I/O —

DRAM write suspension Bit clock input pin. ASDACK input mode after reset

ASDACK

70

CNTOK/

I/O —

Data connection point detection completed signal

ASDFIN

L/R channel data input pin. ASDFIN input mode after reset

Bit clock input pin. ASDACK input mode after reset

71 VSS — — Digital ground pin. Must be connected to 0V.
72 OEB O H DRAM control signal output pin
73 CASB O H DRAM control signal output pin
74 RAMD2 I/O — DRAM data I/O pin
75 RAMD3 I/O — DRAM data I/O pin
76 MVSS — — DRAM I/F ground pin. Must be connected to 0V.
77 MVDD — — DRAM I/F power supply pin
78 RAMD0 I/O — DRAM data I/O pin
79 RAMD1 I/O — DRAM data I/O pin
80 WEB O H DRAM control signal output pin
81 RASB O H DRAM control signal output pin
82 A11 O L DRAM address output pin
83 A10 O L DRAM address output pin
84 A9 O L DRAM address output pin
85 A8 O L DRAM address output pin
86 A7 O L DRAM address output pin
87 A6 O L DRAM address output pin
88 A5 O L DRAM address output pin
89 A4 O L DRAM address output pin

16.9344 MHz resonator connection pins

For L
channel
audio

For crystal
oscillation

For digital
data output

microcompu
ter interface

- 2-22 -

Pin Pin Name I/O State after Function

No. Reset

90 A0 O L DRAM address output pin
91 A1 O L DRAM address output pin
92 A2 O L DRAM address output pin
93 A3 O L DRAM address output pin
94 VDD2 — — Digital power supply pin
95 VVSS — — Built-in VCO ground pin. Must be connected to 0V.
96 PDO1 O — Built-in VCO control phase comparison output pin 1
97 PDO2 O Input mode Built-in VCO control phase comparison output pin 2
98 PCKIST AI — PDO1, PDO2 output current setting resistance connection pin
99 FR AI — Built-in VCO control frequency range setting resistance connection pin

100 VVDD — — Built-in VCO power supply pin

For PLL

■ IC502 A42L2604V

- 2-23 -

■ Block Diagram

- 2-24 -

■ IC503 BA5810FP

28

27

26

25 24

23

22

21 20 19 18 17 16 15

1234 5

6

7 8 9 1011121314

++–+–

+–

+–

+–

7.5k

7.5k

7.5k

7.5k

LOADING PRE

FWE REV

X3

POWER

SAVE

16k

16k

16k

16k

PREVCC

(PRE. LODING)

PREVCC12
(CH1. CH2)

CD1~

CB4

MUTE

POWVCC34

(CH3, CH4)

10k

10k

10k 10k

10k

10k

10k

10k

LEVEL
SHIFT

LEVEL

SHIFT

LEVEL
SHIFT

LEVEL
SHIFT

10k

10k

10k

10k

10k

10k

■ IC504 AMC1117

- 2-25 -

■ BLOCK DIAGRAM

- 2-26 -

■ IC601 PT2313L

RB

RB

TREB_RBIN_RBOUT_RLOUDRINROUTREFAGNDVDD

RIN1

RIN1

RIN2

RIN2

RIN3

RIN3

LIN3

LIN3

Input

Selector

& Gain

Control

LIN2

LIN2

LIN1

LOUT LIN LOUD_L BOUT_L BIN_L TREB_L

LFOUT

Mute

Mute

Mute

Mute

Speaker
ATT

Speaker
ATT

Speaker
ATT

Speaker
ATT

LROUT

CLK

DATA

DGND

RFOUT

RROUT

LIN1

2

11

10

9

13

14

15

17 16 12 19

18

4

25

23

28

27

26

24

22

31 7 6 8 21

20

5

Supply

Bass

Serial Bus Decoder & Latches

Bass

Treble

Treble

Voume
&
Loudness

Voume &
Loudness

- 2-27 -

■ IC801 TDA8571J

+

-

+

-

+

-

+

-

+

-

+

-

+

-

+

-

PGND1 PGND2 PGND3 PGND4

MGG153

OUT4

-

OUT4+

OUT3+

DIAGNOSTIC

OUT2+

V

OUT1+

OUT3

-

OUT2

-

OUT1

-

21

20

22

19

17

9

5

7

4

2

23 16

10

11

12

13

14

30 K•

30 K•

30 K•

30 K•

IN1

MODE

IN2

SGND

IN3

IN4

8 1 15

186

3

ref

V

P1

V

P2

V

P3

V

P4

V

ref

V

DIAG

■ IC901 PT6523

V

SS

V2

LCD

V1

LCD

V

V

LCD

OSC

Common
driver

Segment driver & latch

Shift register

Clock
generator

Address
detector

COM3

DI

CL

CE

COM2

COM1

S35

ZZ

ZZ ZZ ZZ

S34

S9

S8/P8

S2/P2

S1/P1

INH

DD

- 2-45 -

5. RF P.C. BOARD(OLD P.C. BOARD)

(NEW RF P.C. BOARD)

(TOP VIEW)

(BOTTOM VIEW)

2-29 2-30

❏ BLOCK DIAGRAM

TU101 Q101,CF102 IC101 IC102 IC103

VT FM Vcc FM Vcc FM Vcc FM Vcc FM Vcc

Vdd Q807

TU201 FM ON *OPTION

Q109,110 FM OSC

AM Vcc VT Q805

IC104

AM OSC

PWR ON AM ON Q803,Q804

IC502 Q505,Q506,Q507

IC504 IC601

LD S/W MUTE IC801

IC501 *OPTION

LEVEL DET

ACC DET

IC503

*OPTION

FM F/ END

IF Filter &

Amp

IF IC

[LA1140]

NC IC

[KIA6010]

MPX IC

[LA3430M]

AM TUNER

LPF1

PLL IC

[KIC9256P]

Q112

Q203

9.4V Reg
Q802

PWR 14V

Q808,Q809

4.7V ZD102

CD MECHA

TN-2001-005

D-RAM IC

[A43L2604V]

DSP IC

[LC78647NT]

BTL DRIVER

IC

[BA5810FP]

E/Vol IC

[PT2312L]

POWER IC
[TDA8571]

AF Amp

[Q601,Q602]

CDC

u-COM

IC401

[LC875700A]

B/UP

ACC

Q806

SPK

LINE OUTD601

5V Reg

LED Flash

RESET

DIODE MATRIX

LCD DRIVER IC

IC901

[PT6523]

KEY IN1/2

LCD

Back Light

[LD901~925]

3.3V Reg

7.5V Reg

Q501

❏ MAIN SCHEMATIC DIAGRAM

2-31 2-32

2-33 2-34

❏ MW/LW RF SCHEMATIC DIAGRAM

2-35 2-36

❏ CDP SCHEMATIC DIAGRAM

2-37 2-38

❏ PRINTED CIRCUIT DIAGRAM

1. FRONT P.C. BOARD
(COMPONENT SIDE)

2. FRONT P.C. BOARD
(SOLDER SIDE)

2-39 2-40

3. CDP BOARD(SOLDER SIDE) 3. CDP BOARD(COMPONENT SIDE)

2-41 2-42

4. MAIN P.C. BOARD(SOLDER SIDE)

2-43 2-44

4. MAIN P.C. BOARD(COMPONENT SIDE)

3-1 3-2

■ EXPLODED VIEW

301

320

441

447

441

301

281

A44

A43

278

457

A46

A47

285

441

A00A

286

330

455

302

A42

A41

A40

275

274

A00

A00B

450

CAUTION

Exposed blade will cause
severe injury

SECTION 3. CABINET MAIN CHASSIS & MECHANISM

NOTE) Refer to “SECTION 4 REPLACEMENT

PARTS LIST” in order to look for the
part number of each part.