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CIRCUIT DIAGRAM
1. POWER(SMPS) CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTETED WITHOUT PERMISSION FROM THE ZENITH ELECTRONICS CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGI-

NAL CIRCUIT SPECIAL COMPONTS ARE SHADED ON NOTE : THE SCHEMATIC FOR EASY IDENTIFICATION. 1. Shaded( ) parts are critical for safety. Replace only THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFwith specified part number. FER FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED.

IC902 is defective. 8V Power Line dead.

Q908, R928, D913 and Q909 are defective. 5V Power Line dead.

IC903 PIN3 (AC110V, PLAY)

IC901 PIN3 (AC110V, STAND-BY)

Q901 and Q902 are defective. FLD(+), FLD(-) are dead.

IC901 is defective. Power dead.

C927, R918, R922 and IC905 are defective. Power dead.

Q903, Q904 are defective. Power control is abnormal.

NOTES) NOTES) NOTES) NOTES)

Warning Parts that are shaded are critical With respect to risk of fire or electricial shock.

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2. RF & DVD DSP CIRCUIT DIAGRAM
Q202 is defective. DVD LD will not be on. IC204 is defective being slipped during search.

IC209 is defective AD Converter Error

TZC Mirr. Generator

AD Ref. Voltage Gen

RF/TE/FE Signal generation

Q203 is defective CD LD will not be on
Digital Servo DSP/ CD Decoder

Spindle Low Pass Filter

DRAM

3.3V Regulator

IC219 is defective Servo will not operate

IC403 is defective No Spindle Full Speed

T.E F.E

R.F TRACKING LOOP

FOCUS LOOP SLED LOOP

SPINDLE LOOP

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3. DRIVE CIRCUIT DIAGRAM

SPINDLE

MOTOR DRIVE

SPINDLE TRACKING DOOR

FOCUS SLIED

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4. MPEG & ENCODER CIRCUIT DIAGRAM

2 1 3 4 6 7 8 9 10 11 12 13
No power on 3.3V Reg.

5
No power on No power on -com->MPEG address
ROM
VIDEO ENCODER

14 15

The screen is distorted(DVD) Over 3V->Data error. GND:OK No VCD screen display(option). No CD sound out. No DVD screen display

16

Over 3V->Data error. GND:OK (CD/VCD option) No power on No Audio(check clock)
MPEG2 DECODER

No 5.1CH Audio

18

No 2CH Audio Audio signal doesn't appear No screen No power on -com->MPEG command data No power on over 3V: normal

19 20 21 17 25 22
16M SDRAM 16M SDRAM VIDEO ENCODER

No power on Check 89MHz Video Mute doesn't operate in power on/off No Pb output No Pr output No Y output

23

24

No composite video output No Luminance output in Y/C Video No Chrominance output in Y/C Video No power on No power on

CLOCK

VIDEO

26

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5. AUDIO CIRCUIT DIAGRAM

IC712, 713 are defective Audio bad

Q601 is defective 5.1CH FL/FR Audio out bad IC704 is defective 2CH Audio out bad Q705 is defective 2CH Audio out bad

IC604 is defective 5.1CH FL/FR Audio out bad

IC705,706,707 are defective Audio POP noise or 2CH Audio out bad

Q703,704 are defective Headphone output bad

IC703 is defective 2CH Audio out bad

OPTION
AUDIO DAC

OPTION

IC708 is defective Mic input bad IC601 is defective 5.1CH FL/FR Audio out bad IC602 is defective 5.1CH RL/RR Audio out bad
AUDIO DAC

ADC

IC605 is defective 5.1CH RL/RR Audio out bad
AUDIO DAC

IC710,711 are defective Digital Data out bad

IC603 is defective 5.1CH woofer/center Audio out bad
AUDIO DAC

IC709, 702 are defective Audio pop noise or Audio output bad

IC606 is defective 5.1CH woofer/center Audio out bad

AUDIO DIGITAL DATA INPUT CLOCK DIGITAL DATA OUT

AUDIO 2CH R OUT AUDIO 2CH L OUT AUDIO 5.1 CH FR / RR OUT AUDIO 5.1 CH FL / RL OUT

AUDIO 5.1CH CENTER OUT AUDIO 5.1CH WOOFER OUT

IC607,608,609,610,611,612 are defective Audio pop noise or 5.1CH Audio out bad

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6. -COM/EXPANDER CIRCUIT DIAGRAM
Servo will not operate

OPTION(DIVX)

AT49F8192A-90TC/AM29F800BB

FLASH ROM

GM71C4260CJ60

SDRAM

R197 OPEN

BCA DECODER
E X P A N D E R

D[00:15] ; FLD Error A[00:21] ;FLD Error

MAIN CPU
Video output level is unstable

MUX

X101; No Power on Audio output is unstable Servo will not operate

EEPROM
OPEN, Close Error

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7. FRONT(TIMER) & KEY CIRCUIT DIAGRAM
SW509 is defective Direction Key is defect DIG501 is defective FLD is distorted

4 Direction S/W

ENTER

SFUTTLE

FRONT CONTROL RESET
JS500 is defective SCAN +/- wll not operate

RE500 is defective R/C receiver Error IC501 is defective Reset Error

Remocon Receiver

OPEN/CLOSE POWER
Q500 is defective LED will not operate

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8. JACK CIRCUIT DIAGRAM

EXT/DVD can't be changed

16:9 can't be changed

Scart Mode can't be changed

OPTICAL COMP.VIDEO S VIDEO (Y)

S VIDEO (C) AUDIO (L) AUDIO (R)

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WAVEFORM
(POWER) (VIDEO ENCODER)
Tek Stop : 1 00kS/s [ 3290 Acqs T ] Record Length

Fit to Screen OFF T

500 points in 10divs 1000 points in 20divs 2500 points in 50divs more 1 of 3

3

Ch3

1.00V

M 500s

CH1

280/mV

Time Base Main

Trigger Position 50%

Record Length 2500

Horiz Scale (/div)

Horiz Pos

FastFrame Setup

IC901 Pin 3 STAND-BY(AC110V)

IC903 Pin 3 PLAY(AC110V)

IC800 Pin 28 ~ 35 , MPEG Data IC801 Pin 13 ~ 16 , 19 ~ 22 , MPEG Data
Tek Stop : 2.50MS/s 4 Acqs [T ]

IC800 Pin 10, Composite IC801 Pin 57, Composite

IC800 Pin 12, Chrominance IC801 Pin 58, Chrominance
Tek Stop : 1 00kS/s [ 3290 Acqs T ] Edge Slope

T

T

3

3
Ch3 1.00V M 500s CH1 280/mV

M20.0s Ch3 500mV

Glitch Ch1

2 Apr 1999 14:47:27

Type

Source Ch1

Coupling DC

Slope

Level 280mV

Mode & Holdoff

(RF/SERVO)

IC800 Pin 13, Luminance IC801 Pin 59, Luminance
Tek Stop : 10.0kS/s [ 13 Acqs T ] Edge Slope

IC800 Pin 40, 41 SDA/SCL IC801 Pin 75, 76 SDA/SCL
Tek Stop : 2.50MS/s [ 7 Acqs T ] Edge Slope

IC800 Pin 43, MPEG Clock(27MHz) IC801 Pin 71, MPEG Clock(27MHz)

T

T

3

3

Ch3

1.00V

M 5 .00ms CH1

280/mV Ch3 1.00V

M 20.0s

CH1

280/mV

Type

Source Ch1

Coupling DC

Slope

Level 280mV

Mode & Holdoff

Type

Source Ch1

Coupling DC

Slope

Level 280mV

Mode & Holdoff

IC201 Pin 21, Focus Error IC201 Pin 19, SBADD

IC201 Pin 20 Tracking Error

IC201 Pin 20 VBR TRACKING Error

IC800 Pin 49, Vertical SYNC IC801 Pin 24, Vertical SYNC

IC800 Pin 50 Horizontal SYNC IC801 Pin 59 Horizontal SYNC

IC801 Pin 42 Component Pb

IC201 Pin 28, RF

IC206 Pin 88, SLED Drive(FMO) IC202 Pin 18, SLED FG

IC201 Pin 21, Focus Error(in Focus Search) IC206 Pin 83, Focus Drive(FDO)

IC801 Pin 43 Component Pr

IC801 Pin 44 Component Y

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