Lg Ffh-171a User manual

- 2 -

CONTENTS

MICRO COMPONENT SYSTEM

1. SERVICING PRECAUTIONS 3

2. ESD PRECAUTIONS 5

3. SPECIFICATIONS 6

4. ADJUSTMENTS 8

5. MAJOR WAVEFORM 11

6. TROUBLESHOOTING GUIDE 14

7. BLOCK DIAGRAM 19

8. SCHEMATIC DIAGRAM 20~23

• FRONT & KEY CIRCUIT 20

• AMP & DECK CIRCUIT 21

• TUNER CIRCUIT 22

• CDP CIRCUIT 23

9. WIRING DIAGRAM 24

10. PCB LAYOUTS 25~26

• MAIN P.C.BOARD 25

• CDP P.C. BOARD 26

11. INTERNAL BLOCK DIAGRAM OF ICs 27

12. EXPLODED VIEW/PARTS LIST 38~40

• CABINET 38

• TAPE DECK MECHANISM: AUTO STOP DECK 39

13. REPLACEMENT PARTS LIST 41~52

SPEAKER SYSTEM

1. SPECIFICATION 53

2. SCHEMATIC DIAGRAM 53

3. EXPLODED VIEW/PARTS LIST 54

- 3 -

SERVICING PRECAUTIONS

NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

2. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and

impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or

damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason

the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage the eyes!

Absolutely never permit laser beams to enter the eyes!

Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

5) Cleaning the lens surface

If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used

for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a

cotton swab should be used, taking care not to distort this.

6) Never attempt to disassemble the pick-up.

Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do

not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of

this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

Storage in conductive bag Drop impact

NEVER look directly at the laser beam, and don’t let

contact fingers or other exposed skin.

Magnet

How to hold the pick-up

Pressure

Cotton swab

Conductive Sheet

- 4 -

NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These

components are sensitive to, and easily affected by, static electricity. If such static electricity is high

voltage, components can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must

be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong

magnetism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded.

When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is

because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1MΩ)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent

static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

Armband

Conductive

Sheet

Resistor

(1 Mohm)

Resistor

(1 Mohm)

- 5 -

ESD PRECAUTIONS

Electrostatically Sensitive Devices (ESD)

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components

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 materials).

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 by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER

SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing 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.

- 6 -

SPECIFICATIONS

1. AMP SECTION

1) Output Power(4Ω, 2ch, T.H.D 10%) 5W + 5W

2) T.H.D 0.15%

3) Frequency Response (3dB down) 40Hz~20kHz

4) Signal-to-noise Ratio 70dB

5) Input Impedance 47kΩ

6) Input Sensitivity 400±30mV

7) Separation(AUX) 100Hz/1kHz/10kHz 50dB/50dB/40dB

2. TUNER SECTION

(1) FM(OIRT)

1) Frequency Range(50kHz or 100kHz Step) 65.0MHz~74MHz, 87.5MHz~108MHz

or 87.5MHz~108MHz

2) Intermediate Frequency 10.7MHz

3) Sensitivity 90/98/106MHz 11dB

4) Signal-to-noise Ratio (Mono/Stereo) 55dB/50dB

5) Image Rejection 106MHz 38dB

6) IF Rejection 90MHz 65dB

7) Distortion (Mono/Stereo) 1.0%/1.2%

8) Frequency Response (-3dB) 60Hz~10kHz

9) Separation 100Hz/1kHz/10kHz 25dB/25dB/20dB

(2) AM(MW)

1) Frequency Range(9kHz or 10kHz Step) 522(530)kHz~1611(1720)kHz

2) Intermedite Frequency 450kHz

3) Usable Sensitivity 603/1008/1404kHz 56dB

4) Image Rejection 1404kHz 25dB

5) IF Rejection 603kHz 48dB

6) Selectivity 1008kHz 28dB

7) Signal-to-noise Ratio 1008kHz 40dB

8) Distortion 1008kHz 1.6%

9) Frequency Response (-6dB) 100Hz~2000Hz

(3) SW

1) Frequency Range 5.8MHz~18.0MHz

2) Intermedite Frequency 450kHz

3) Usable Sensitivity 40dB

4) Selectivity 28dB

5) Signal-to-noise Ratio 11MHz 37dB

- 7 -

(4) LW

1) Frequency Range 153kHz~281kHz

2) Intermediate Frequency 450kHz

3) Usable Sensitivity 65dB

4) Image Rejection 254kHz 25dB

5) Signal-to-noise Ratio 200kHz 30dB

6) Distortion 200kHz 3%

3. TAPE DECK

1) Tape Speed (MTT-111) 4.75 cm/sec

2) Wow Flutter (MTT-111) 0.25%

3) Fast Forward & Rewind Time (C-60) 120sec

4) Frequency Response (Playback:5dB Range) 125Hz~10kHz

5) Signal-to-noise Ratio (Playback/Record) 48dB/43dB

6) Distortion (Playback/Record) 2% / 3.5%

7) Cross Talk (Playback/Record) 55dB/53dB

8) Channel Separation (Playback/Record) 50dB/43dB

9) Erase Ratio 55dB

4. CDP

1) Frequency Response (40Hz~20kHz) ±3.0dB

2) Signal-to-noise Ratio 70dB

3) Dynamic Range 73dB

4) T.H.D 0.4%

5) Separation 60dB

5. GENERAL

1) Power Requirement Refer to the back panel of unit

2) Power Consumption 30W

3) Dimension (Net:W x H x D) 161 x 249 x 275(mm)

4) Weight (Net) 3.1kg

NOTE : Specification are subject to change without notice in the course of product improvement.

- 8 -

ADJUSTMENTS

This set has been aligned at the factory and normally will not require further adjustment. As a result, it is not

recommended that any attempt is made to modificate any circuit. If any parts are replaced or if anyone tampers

with the adjustment, realignment may be necessary.

ADJUSTMENT & TEST POINT

Figure 1. Main P.C. Board

L140

(RECORD BIAS

ADJUSTMENT)

L21

(FM IF

ADJUSTMENT)

- 9 -

TAPE DECK ADJUSTMENT

1. AZIMUTH ADJUSTMENT

Figure 3. Azimuth Adjustment Connection Diagram

2. RECORD BIAS ADJUSTMENT

Figure 4. Record Bias Adjustment Connection Diagram

TUNER ADJUSTMENT

Figure 2. Tuner(S curve) Adjustment Connection Diagram

CH1 CH2

Speaker

Terminal

Playback Mode

Head

Test Tape

MTT-114

L ch

R ch GND

Dual-trace

synchroscope

Electronic

Voltmeter

L out

R out

Unit

28 PIN

Signal Generator

GND

Electronic

OSCILLOSCOPE

FM Antenna

Terminal

Deck Mode Test Tape Test Point Adjustment Adjust for Remark

Playback MTT-114 Speaker Head Screw R/L Maximum Forward:Righthand Side Screw

Terminal Reverse:Lefthand Side Screw

Item Test Point Adjustment Adjust for

DC Voltage IC10 26, 28 pin L21 0V±50mV

Deck Mode Test Tape Test Point Adjustment Adjust for

Rec/Pause MTT-5511 Erase Head Wire L140 83kHz±5kHz

Head

Unit

Erase Head Wire

GND

Record/Playback

Head

Test Tape

MTT-5511

Record/Playback

and Pause Mode Frequency Counter

- 10 -

CDP ADJUSTMENTS

• When change the pick-up must be confirm as follow

1. TRACKING BALANCE CONFIRMATION

1) Connect the oscilloscope to TEO and REF.(IC501 pin 54 and 71)

2) Access from 1st selection to last section of test disc (YEDS-18)

3) Confirm the normal state of tracking error signal (T.B deviation : less than ±3%)

2. RF WAVEFORM CONFIRMATION

1) Connect the oscilloscope to RF and REF.(IC501 pin 74 and 71)

2) Put a test disc (SONY YEDS-18) into unit and playback the 18th selection of the test disc.

3) Confirm the normal state of RF waveform.

4) Confirm the less than 30nS of Jitter Meter reading.

OV(DC Mode) T.B deviation(%)

= X %

A=B

A+B

A-B 2

100

3T, 4T 5T,6T 11T

EYE-PATTERN EYE-PATTERN

OK NG

- 11 -

• Connection : 1. IC501 pin 54.(TEO)

2. IC501 pin 50

• Inspection : Check tracking servo

circuit.(RWD)

• Connection : 1. IC501 pin 54 .(TEO)

2. IC501 pin 50

• Inspection : Check tracking servo

circuit.(RWD)

FOCUS GAIN TRACKING GAIN

• Connection : 3. IC502 pin 1and 2.

• Test disc : YEDS-43

• Inspection : Confirm focus servo circuit.

• Connection : 3. IC502 pin 26 and 27 .

• Test disc: YEDS-43

• Inspection : Confirm TRACK servo circuit.

TRACKING ERROR(REW) TRACKING ERROR(FWD)

MAJOR WAVEFORM

∆V1=0.00V TRIG 1=1.0V

∆V2=0.00V

DLY>=0.85ms

1V 1V PEAKDET 1ms 1ms

SAVE

∆T=0.00ms

∆V1=0.00V TRIG 2=1.0V

∆V2=0.00V SREF 2 A

DLY>=0.85ms

1V 1V PEAKDET 1ms 1ms

∆T=0.00ms

∆V1=0.000V TRIG 1=0.09V

DLY>=4.25ms

0.5V PEAKDET 5ms 5ms

SAVE

∆T=0.00ms

∆V1=0.0% TRIG 1=-82%

DLY>=0.170s

>1V PEAKDET 0.2s 50ms

SAVE

∆T=0.000s

- 12 -

TRACKING COIL DRIVE E.F. BALANCE

• Connection : 1. IC501 pin 54 . (TEO)

2. IC501 pin 50

• Inspection : - Confirm tracking servo circuit.

- Check IC501 (Cold solder joint

or short circuit)

• Connection : 1. IC501 pin 54 .

• Inspection : Confirm tacking servo balance

deviation rate

READING

• Connection : 7. IC501 pin 48 .

8. IC501 pin 40 (FOK)

• Inspection : Check IC502 pin 4to IC501 PIN

48 (Pattern defective)

∆V1=0.00V TRIG 1=-0.1V

∆V2=0.00V

DLY>=0.425s

1V 2V PEAKDET 0.5s 50ms

SAVE

∆T=0.000s

∆V1=3.96V TRIG 1=1.1V

DLY>=1.70ms

1V PEAKDET 2ms 2ms

SAVE

∆T=0.00ms

∆V1=0.00V TRIG 1=0.2V

∆V2=0.00V

DLY>=0.425s

2V 5V PEAKDET 0.5s 50ms

SAVE

∆T=0.000s

- 13 -

• Connection : 9. IC502 pin 17 and 18

• Inspection : - Check IC501 pin 43 to IC502

pin 20 (Pattern defective)

- Check voltage. (IC502 pin 20 )

• Connection : 10. IC501 pin 74 .

• Inspection : Check objective Lens of Pickup

clear or not

• Connection : 11. IC502 pin 1and 2 .

• Inspection : - Is focus search signal output to

IC501 pin 48 ?

• Connection : 12. IC501 pin 33 .

• Inspection : Check IC503 and surrounding

circuit (Cold solder joint or short

circuit)

TRIG 1=1.1V

∆V2=0.000V

DLY>=0.085s

0.5V PEAKDET 0.1s 50ms

SAVE

∆T=0.000s

TRIG 1=24%

DLY>=0.670ms

50mV 0.5ms 0.5ms

∆V1=0.00V TRIG 1=0.3V

DLY>=0.085s

2V PEAKDET 1s 50ms

SAVESREF 3 A ∆T=0.00s

>2V

- 14 -

TROUBLESHOOTING GUIDE

CD PART

Is the function selector in the CD position?

Is power turned ON?

Does initial reading occur?

Can disc be played?

Is audio output supplied?

END

• Check power supply circuitry.

• Check laser circuitry.

• Check focusing circuitry.

• Check disc.

• Check tracking servo circuitry.

• Check Audio circuitry.

YES

- 15 -

1-1.8V

2.5V

1. If initial reading is not carried out (with disc)

YES

NO NO

NO NO NO

Is IC601 pin 22 output

waveform normal?

Door open

(3.2V~5V) Door close(1.9V~2.5V)

Does laser light?

• Leaf SW contact defective.

• Connector defective.

• Pattern short.

Does disc motor rotate?

Is HF

waveform

output?

IC501 pin 74

Is tracking servo

operating?

Is the lower

envelope of HF

(RF) waveform

flat?

Is signal output

at IC501 pin

50?

Is signal output at tracking

output IC502 pin 26, 27?

Does IC503 pin 25 (LKFS) as

figure?

Is retation normal?

Is there any irregularity in

frequency?

Is HF signal normal without

dropout?

Is TER signal

output, at

IC501 pin

54?

• IC501

defective.

• Connector

defective.

• Pick up

defective.

• Pattern

defective.

• IC502 or pattern

defective.

• Pick up

defective.

• Connector

defective.

• IC501 or IC503

defective.

• PLL CIRCUIT

defective.

• Disc initial reading

damaged or

defective.

• CLV

SERVO(R530,

C535, C536, R531)

circuit defective.

- 16 -

A

When laser does not light

Is below signal “H” at IC501 pin

38 (RESET)?

Has Laser Power source returned to

the Q501?

(Q501 Collector Voltage about 1.8V)

Does generate about 3.3V at IC501

pin 70 (LD)?

Flow Laser Current?

Both voltage of 507 is about 1.0V?

Are data transferred from

IC601?

IC601 pin 95 : XLT

pin 94 : XRST

pin 98 : DATA

pin 97 : CLK

Is below signal output at

IC502 pin 17, 18?

• IC601 defective.

• IC501 defective.

•

Surrounding Circuitry defective.

• Connector defective.

• Pick-up defective.

• IC501, 502 defective.

• Slide motor defective.

• Connector defective.

• IC505 defective.

• LMT SW defective.

• Connector defective.

• IC502 defective.

•

Q501 defective, connector defective.

• Laser defective.

•

Connector defective. short etc.

Has Pick-up returned to the

innermost position?

Does pick-up stop after

having moved to the

innermost position?

Are detect output input at

IC601 pin 22?

R507»1.0V

R507«1.0V

YES

YES (2.5V)

OPEN CLOSE

(1.95V)

YES

[

- 17 -

Amplitude 0.5~1.5v

IC501 Pin

FOK IC501 Pin

40

Do lenses move up and down? Is signal output at focus

search terminal?

IC 501 pin 48 (FEO)

Is signal output at IC502

pin 1 , 2 ?

When laser light

• IC501 defective.

• C527 defective.

• IC 502 defective.

• IC501 defective.

• Pattern defective.

• Actuator short.

• Connector short.

• IC501 defective.

• Pick-up defective.

• Turntable height error

• Laser diode degraded.

Is IC501 pin 74 (HF) signal waveform

output?

The waveform of IC501 pin 74 (HF) is

below figure?

Is Fok signal intput to IC601 pin 99 ?

Is Fok signal output?

(HF and REF) 0.4 over OK.

YES

NO NO

- 18 -

FER

SENSE

(ISTAT)

at Start

Is FER signal output? IC501 Pin 59?

Is FZC signal output at IC501 Pin 31

(SENS)?

Is Mon signal output by

IC503 Pin 73?

Is MDP signal output by

IC503 Pin 75?

Has voltage at disc motor?

(IC502 pin 11, 12 )

• IC501 defective.

• Pick up defective.

• Connector defective.

• IC501 defective.

• Pattern defective between.

• IC503 Pin 27,36,37,38 and IC601.

• IC501, 502 defective.

• Surrounding circuity defective.

• Disc Motor defective.

• Connector defective.

When Fok focus

Servo Conform by

FZC signal

YES

- 28 -

■LC72131, 72131M

B01 B02 B03 B04 I01 I02

XIN PD

AIN

AOUT

IFIN

XOUT

FMIN

AMIN

VDD

VSS

REFERENCE

DIVIDER PHASE DETECTOR

CHARGE PUMP

UNLOCK

DETECTOR

UNIVERSAL

COUNTER

DATA SHIFT REGISTER

LATCH

12bits PROGRAMMABLE

DIVIDER

SWALLOW COUNTER

1/16. 1/17 4bits

POWER

RESET

C B

I/F

■TDA7440D

L-IN1 100K

100K

48918

LOUT

SCL

SDA

DIG_GND

ROUT

AGND

14 15

10 11 19 12 13 23

INPUT MULTIPLEXER

+GAIN

MUXOUTR INR TREBLE(R) BIN(R) BOUT(R) CREF D98AU883

0/30dB

2dB STEP

MUXOUTL

VOLUME TREBLE

I CBUS DECODER + LATCHES

BASS SPKR ATT

LEFT

VOLUME TREBLE BASS

SUPPLY

VREF

SPKR ATT

RIGHT

INL TREBLE(L) BOUT(L)BIN(L)

L-IN2

L-IN3

L-IN4

R-IN1

R-IN2

R-IN3

R-IN4

- 29 -

■KB9223(IC501)

OVERVIEW

The KB9223 is a 1-chip BICMOS intergrated circuit to perform the

function of RF AMP and Servo signal processor for compact disc

player application. It consist of blocks for RF signal processing,

focus, tracking, sled and spindle servo. Also this IC has adjustment

free function and embeded opamp for audio post filter.

FEATURES

• RF amplifier & RF equalizer

• Focus error amplifier & servo control

• Tracking error amplifier & servo control

• Mirror & Defect detector circuit

• Focus OK detrector circuit

• APC(Auto Laser Power Control) circuit for constant laser power

• FE bias & focus servo offset adjustment free

• EF balance & tracking error gain adjustment free

• Embeded audio post filter

• The circuit for Interruption countermeasure

• Double speed play available

• Operating voitage range 3.4V~5.5V

PIN CONFIGURATION

SSTOP

FOK

MIRROR

RESET

MLT

MDATA

MCK

AVEE

EFM

ASY

ISTAT

TRCNT

LOCK

FGD

FS3

FLB

SMEF

PD1

PD2

AVCC

RF-

RFO

IRF

ARF

RF1

CAGC

AVEE

SL+

SLO

SL-

SPDL-

SPDLD

FE-

FEO

TE-

TEO

ATSC

TZC

TE2

TE1

LPFT

DVCC

TDFET

FE2

FE1

FDFCT

TGU

TG2

FEBIAS

DVEE

SMON

SMDP

WDCH

VREG

ISET

MUTEI

VSSP

RRC

CH1I

CH10

CH1I

CH10

CH20

CH21

GC20

GC21

VCCP

AVCC

FSET

DCC1

DCC2

FRSH

DCB

MCP

KB9223

ORDERING INFORMATION

APPLICATIONS

• CD PLAYER

• Video-CD

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