Zenith XBV243 series User manual

SERVICE MANUAL
Product Type: VCR DVD Combo
Chassis: D35E Combo
Manual Series: VR168
Manual Part #: 923-03485
Model Line: E
Product Year: 2002
General Info ................................................. 1
Service Menu ................................................ 2
Servicing ..................................................... 3
Parts List ..................................................... 4
Diagrams ...................................................... 5
Schematics ................................................... 6
Published March 2002
by Technical Publications
Zenith Electronics Corporation
201 James Record Road
Huntsville, Alabama 35824-1513
Copyright  2002 by Zenith Electronics Corporation
Model Series:
CONTENTS
XBV243
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VR168 - 923-03485 D35E COMBO - SAFETY
PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO-VIDEO PRODUCTS
i
IMPORTANT SAFETY NOTICE
This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original
design be modified or altered without permission from Zenith Electronics
Corporation. All components should be replaced only with types identical to
those in the original circuit and their physical location, wiring and lead dress
must conform to original layout upon completion of repairs.
Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component
designators and are required to maintain safe performance. No deviations are
allowed without prior approval by Zenith Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into
the set is not delayed until the new service literature is printed.
CAUTION: Do not attempt to modify this product in any way. Never perform
customized installations without manufacturer’s approval. Unauthorized
modifications will not only void the warranty, but may lead to property damage
or user injury.
Service work should be performed only after you are thoroughly familiar with
these safety checks and servicing guidelines.
GRAPHIC SYMBOLS
The exclamation point within an equilateral triangle is intended
to alert the service personnel to important safety information in
the service literature.
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the service personnel to the presence
of noninsulated “dangerous voltage” that may be of sufficient
magnitude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an
equilateral triangle is intended to convey to the service personnel
the following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED
NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock.
After the original service problem has been corrected, make a check of the
following:
FIRE AND SHOCK HAZARD
1. Be sure that all components are positioned to avoid a possibility of
adjacent component shorts. This is especially important on items trans-
ported to and from the repair shop.
2. Verify that all protective devices such as insulators, barriers, covers,
shields, strain reliefs, power supply cords, and other hardware have been
reinstalled per the original design. Be sure that the safety purpose of the
polarized line plug has not been defeated.
3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign
particles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.
5. No lead or component should touch a high current device or a resistor
rated at 1 watt or more. Lead tension around protruding metal surfaces
must be avoided.
6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of
electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS
TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity in
the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by
a .15 mfd 150V AC type capacitor between a known good earth ground
water pipe, conduit, etc.) and the exposed metallic parts, one at a time.
Measure the AC voltage across the combination of 1500 ohm resistor and
.15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor
and repeat AC voltage measurements for each exposed metallic part. Voltage
measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp
AC. Any value exceeding this limit constitutes a potential shock hazard and
must be corrected immediately.
X-RADIATION
1. Be sure procedures and instructions to all service personnel cover the
subject of x-radiation. The only potential source of x-rays in current TV
receivers is the picture tube. However, this tube does not emit x-rays when
the HV is at the factory-specified level. The proper value is given in the
applicable schematic. Operation at higher voltages may cause a failure of
the picture tube or high-voltage supply and, under certain circumstances
may produce radiation in excess of desirable levels.
2. Only factory-specified CRT anode connectors must be used.
3. It is essential that the service personnel have available an accurate and
reliable high-voltage meter.
4. When the high-voltage circuitry is operating properly, there is no possibility
of an x-radiation problem. Every time a chassis is serviced, the brightness
should be run up and down while monitoring the high voltage with a
meter, to be certain that the high voltage does not exceed the specified
value and that it is regulating correctly.
5. When troubleshooting and making test measurements in a product with a
problem of excessively high voltage, avoid being unnecessarily close to
the picture tube and the high voltage power supply. Do not operate the
product longer than necessary to locate the cause of excessive voltage.
6. Refer to the CRT Anode High Voltage Measurement and Shutdown Adjustment
procedures described in the appropriate text (where used).
IMPLOSION
1. All direct view picture tubes are equipped with an integral implosion
protection system; take care to avoid damage during installation.
2. Use only the recommended factory replacement tubes.
TIPS ON PROPER INSTALLATION
1. Never install any receiver in a closed-in recess, cubbyhole, or closely
fitting shelf space over, or close to, a heat duct, or in the path of heated
air flow.
2. Avoid conditions of high humidity such as: outdoor patio installations
where dew is a factor, near steam radiators where steam leakage is a factor,
etc.
3. Avoid placement where draperies may obstruct venting. The customer
should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
4. Wall- and shelf-mounted installations using a commercial mounting kit
must follow the factory-approved mounting instructions. A product mounted
to a shelf or platform must retain its original feet (or the equivalent
thickness in spacers) to provide adequate air flow across the bottom. Bolts
or screws used for fasteners must not touch any parts or wiring. Perform
leakage tests on customized installations.
5. Caution customers against mounting a product on a sloping shelf or in a
tilted position, unless the receiver is properly secured.
6. A product on a roll-about cart should be stable in its mounting to the cart.
Caution the customer on the hazards of trying to roll a cart with small
casters across thresholds or deep pile carpets.
7. Caution customers against using a cart or stand that has not been listed
by Underwriters Laboratories, Inc. for use with its specific model of
television receiver or generically approved for use with TVs of the same or
larger screen size.
8. Caution customers against using extension cords. Explain that a forest of
extensions, sprouting from a single outlet, can lead to disastrous
consequences to home and family.
A
.C. Voltmeter
1500 OHM
10 WATT
Place this probe
on each expose
d
metal part.
Good Earth Ground
such as the Water
Pipe, Conduit, etc.
0.15uF
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TABLE OF CONTENTS
VR168 - 923-03485 D35E COMBO - TOC
SECTION 1 SUMMARY 1-1
SPECIFICATIONS .......................................... 1-1
KEY TO ABBREVIATIONS ................................1-2
SERVICING PRECAUTIONS .............................. 1-3
PACKAGE CONTENTS .....................................1-4
SECTION 2 CHASSIS 2-1
CABINET .................................................... 2-1
EXPLODED DIAGRAM .....................................2-1
SELF DIAGNOSTICS .......................................2-2
CABINET DISASSEMBLY ................................. 2-3
CIRCUIT BOARD DISASSEMBLY ........................2-4
SECTION 3 ELECTRICAL 3-1
DVD TROUBLESHOOTING ................................3-1
VCR TROUBLESHOOTING .............................. 3-17
SECTION 4 MECHANICAL 4-1
VCR DECK MECHANISM .................................. 4-1
VCR ALIGNMENT ........................................ 4-13
MAINTENANCE/INSPECTION PROCEDURE ......... 4-19
VCR MECHANISM TROUBLESHOOTING ............. 4-23
DVD DECK MECHANISM ............................... 4-29
MECHANISM DISASSEMBLY........................... 4-30
DECK MECHANISM ADJUSTMENT ................... 4-32
SECTION 5 PARTS 5-1
COMPONENT PARTS .......................................... 5-2
TOC-1
SECTION 6 DIAGRAMS 6-1
EXPLODED VIEW ........................................... 6-1
VCR EXPLODED VIEW .....................................6-2
DVD EXPLODED VIEW .....................................6-3
MAIN BLOCK DIAGRAM .................................. 6-4
POWER BLOCK DIAGRAM ................................6-5
TUNER-IF BLOCK DIAGRAM............................. 6-6
Y/C BLOCK DIAGRAM .....................................6-7
AUDIO BLOCK DIAGRAM ................................. 6-8
HIFI BLOCK DIAGRAM ................................... 6-9
SYSTEM BLOCK DIAGRAM ............................. 6-10
SECTION 7 SCHEMATICS 7-1
POWER SUPPLY CIRCUIT ................................ 7-1
TUNER/IF CIRCUIT .......................................7-2
AV CIRCUIT ................................................. 7-3
HIFI CIRCUIT ..............................................7-4
SYSTEM CIRCUIT .......................................... 7-5
DVD CIRCUIT ............................................... 7-6
DRIVE RF CIRCUIT ........................................ 7-7
MPEG CIRCUIT ............................................. 7-8
AUDIO CIRCUIT............................................ 7-9
MICRO CIRCUIT .......................................... 7-10
JACKPACK CIRCUIT ..................................... 7-11
VCR PCB LAYOUT ........................................ 7-12
DVD PCB LAYOUT TOP.................................. 7-13
DVD PCB LAYOUT BOTTOM ............................ 7-14
OTHER PCB LAYOUTS ................................... 7-15
WAVEFORMS .............................................. 7-16
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- TOC-2 -
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VR168 - 923-03485 1-1 D35E COMBO - SUMMARY
SUMMARY
SPECIFICATIONS
DVD PART
Power supply ........................................ AC 120 V, 60 Hz
Power .................................................. 23 W
Mass .................................................... 3.0kg(6.6lbs)
External dimensions .............................. 430 x 88 x 247 (W x H x D)
Signal system ....................................... PAL 625/50, NTSC 525/60
Laser ................................................... Semiconductor laser, wavelength 650nm
Frequency range ................................... (digital audio) 4 Hz to 20 kHz
Signal-to-noise ratio ............................. (digital audio) More than 100 dB (EIAJ)
Audio dynamic range ............................. (digital audio) More than 95 dB (EIAJ)
Harmonic distortion .............................. (digital audio) 0.008%
Wow and flutter .................................... Below measurable level (less than +0.001% (W.PEAK) (EIAJ)
Operating Temperature ........................... 5°C (41°F) to 35°C (95°F)
OUTPUTS
Video outputs ...................................... 1.0V (p-p), 75., negative sync., RCA jack x 1
S video outputs .................................... (Y) 1.0V (p-p), 75., negative sync.,Mini DIN 4-pin x 1
(C)0.3V(p-p), 75.
Component video .................................. output (Y) 1.0 V (p-p), 75 ., negative sync., RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 .
Audio output ....................................... (digital audio) 0.5V (p-p), 75., RCA jack X 1
Audio output ....................................... (optical audio) Optical connector x 1
Audio output ....................................... (analog audio) 2.0Vrms (1kHz,0dB), RCA jack (L,R) x 1
VHS PART
Video Head System ................................ Double azimuth 4 heads, helical scanning
RF Modulator........................................ UHF 28-68 (Adjustable)
Tape format .......................................... Tape width 12.7 mm (0.5 inch)
Timer ................................................... 24 hours display type
*Designs and specifications are subject to change without notice.
*Weight and dimensions shown are approximate.
section 1 SUMMARY
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VR168 - 923-03485 1-2 D35E COMBO - SUMMARY
SUMMARY
A AC Alternating Current
ACC
Automatic Color Control
ADJ
Adjust
A/E
Audio Erase
AFC
Automatic Frequency Control
AFT
Automatic Fine Tuning
AGC Automatic Gain Control
ALC
Automatic Level Control
AM
Amplitude Modulation
AMP
Amplifier
ANT
Antenna
APC
Automatic Phase Control
ASS’Y
Assembly
AUD
Audio
AUTO
Automatic
AUX
Auxiliary
B
B Base
BPF
Bandpass Filter
BW or B/W
Black and White
C
C Capacitor, Chroma, Collector
CAN
Cancel
CAP
Capstan
CATV
Cable Television
CBA
Circuit Board Assembly
CCD
Charge Coupled Device
CFG
Capstan Frequency Generator
CH
Channel
CHROMA
Chrominance
CLK
Clock
CNR
Chroma Noise Redution
COMB
Combination
Comb Filter
COMP
Comparator
Composite
Compensation
CONV
Converter
CS
Chip Select
CST
Cassette
CTL
Control
CUR
Current
CYL
Cylinder
D
D Drum, Digital, Diode, Drain
dB
Decibel
DC
Direct Current
DEMOD
Demodulator
DET
Detector
DEV
Deviation
DHP
Double High Pass
DIGITRON
Digital Display Tube
DL
Delay line
DOC
Drop Out Compensator
D/V
Dummy Vertical
E
E Emitter
EE
Electric to Electric
EMP
Emphasis
EP
Extended Play
EQ
Equalizer
ES
Electrostatically Sensitive
F
F Fuse
FB
Feed Back
FBC
Feed Back Clamp
FE
Full Erase
FF
Fast Forward
FG
Frequency Generator
FL
Filter
FM
Frequency Modulation
F/R
Front/Rear
FS
Frequency Synthesizer
FSC
Subcarrier Frequency
F/V
Frequency Voltage
FWD
Forward
G
GEN Generator
GND
Ground
H
H High, Horizontal
Hz
Hertz
I
IC Integrated Circuit
IF
Intermediate Frequency
INS
Insert
I/O
Input/Output
L
L Low, Left, Coil
LD
LED
LECHA
Letter Character
LP
Long Play
LPF
Low Pass Filter
M
MAX Maximum
MD
Modulator
MIC
Microphone
MIN
Minimum
MIX
Mixer, Mixing
MM
Monostable, Multivibrator
MMV
Mono Multi Vibrator
MOD
Modulation, Modulator
MODEM
Modulator-Demodulator
N
NR Noise Reduction
O
OSC Oscillator
OSD
On Screen Display
P
PB Playback
PCB
Printed Circuit Board
PG
Pulse Generator
PLL
Phase Locked Loop
P. P
Peak-to-Peak
PRE-AMP
Preamplifier
PS
Phase Shift
PWM
Pulse Width Modulation
Q
Q Transistor
QH
Quasi Horizontal
QSR
Quick Setting Record
QTR
Quick Timer Record
QV
Quasi Vertical
R
R Resistor, Right
RE(or RC)
Remocon, Receiver
REC
Recording
REF
Reference
REG
Regulated, Regulator
REMOCON
Remote Control(unit)
REV
Reverse
REW
Rewind
RF
Radio Frequency
R/P
Record/Playback
RTC
Reel Time Counter
S
S Serial
SH
Shift
SHARP
Sharpness
SIF
Sound Intermediate Frequency
SLD
Side Locking
S/N
Signal to Noise Ratio
SP
Standard Play
SUB
Subtract, Subcarrier
SW or S/W
Switch
SYNC
Synchronization
SYSCON
System Control
T
T Coil
TP
Test Point
TR
Transistor
TRK
Tracking
TRANS
Transformer
TU
Tuner, Take-up
U
UHF Ultra High Frequency
UNREG
Unregulated
V
V Volt, Vertical
VA
Always Voltage
VCO
Voltage Controlled Oscillator
VGC
Voltage Gain Control
VHF
Very High Frequency
VISS
VHS Index Search
VR
Variable Resistor or Volume
V-SYNC
Vertical Synchronization
VTG
Voltage
VV
Voltage to Voltage
VXO
Voltage X-tal Oscillator
W
W Watt
WHT
White
W.O
With out
X
X-TAL Crystal
Y
Y/C Luminance/Chrominance
YNR
Luminance Noise Reduction
Z
ZD Zener Diode
KEY TO ABBREVIATIONS
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VR168 - 923-03485 1-3 D35E COMBO - SUMMARY
SUMMARY
SERVICING PRECAUTIONS
CAUTION: Before servicing the product covered by this
service data and its supplements and addends, read and
follow the SAFETY PRECAUTIONS.
NOTE: if unforeseen circumstances create conflict between
the following servicing precautions and any of the
safety precautions in this publication, always follow
the safety precautions.
GENERAL SERVICING PRECAUTIONS
1. Always unplug the product AC power cord from the
AC power source before:
(1) Removing or reinstalling any component, circuit
board, module, or any other assembly.
(2) Disconnecting or reconnecting any internal elec-
trical plug or other electrical connection.
(3) Connecting a test substitute in parallel with an
electrolytic capacitor.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in
an explosion hazard.
2. Do not spray chemicals on or near this product or
any of its assemblies.
3. Unless specified otherwise in this service data, clean
electrical contacts by applying an appropriate con-
tact cleaning solution to the contacts with a pipe
cleaner, cotton-tipped swab, or comparable soft ap-
plicator. Unless specified otherwise in this service
data, lubrication of contacts is not required.
4. Do not defeat any plug/socket B+ voltage interlocks
with which instruments covered by this service
manual might be equipped.
5. Do not apply AC power to this product and/or any of
its electrical assemblies unless all solid-state device
heat sinks are correctly installed.
6. Always connect the test instrument ground lead to
the appropriate ground before connecting the test
instrument positive lead. Always remove the test in-
strument ground lead last.
INSULATION CHECKING PROCEDURE
Disconnect the attachment plug from the AC outlet and
turn the power on. Connect an insulation resistance meter
(500V) to the blades of the attachment plug. The
insulation resistance between each blade of the
attachment plug and accessible conductive parts should
be more than 1Mohm. Accessible conductive parts
include metal panels, input terminals, earphone jacks,
etc.
ELECTROSTATICALLY SENSITIVE (ES) DEVICES
Some semiconductor (solid state) devices can be
damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive (ES)
Devices. Examples of typical ES 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 com-
ponent or semiconductor-equipped assembly, drain
off any electrostatic charge on your body by touch-
ing 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
ES devices, place the assembly on a conductive sur-
face 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 ES 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
ES devices.
5. Do not use freon-propelled chemicals. These can gen-
erate an electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its pro-
tective package until immediately before you are
ready to install it. (Most replacement ES devices are
packaged with leads electrically shorted together by
conductive foam, aluminum foil, or comparable con-
ductive material).
7. Immediately before removing the protective mate-
rial from the leads of a replacement ES device, touch
the protective material to the chassis or circuit as-
sembly 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 ES devices. (Normal 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
ES device.)
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VR168 - 923-03485 1-4 D35E COMBO - SUMMARY
SUMMARY
PACKAGE CONTENTS
BATTERY
PACKIN G SHEET
PACK I N G
OPTIONAL PARTS
OWNER'S MANUAL
RF CABLE
CABLE SET ASS'Y
REMOCON
BOX CARTON
PACKING
PHONO CORD 1WAY
PHONO CORD 2WAY
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VR168 - 923-03485 2-1 D35E COMBO - CHASSIS
CHASSIS
CABINET
FRONT
DISPLAY
BACK
section 2 CHASSIS
EXPLODED DIAGRAM
See page 6-1 for a detailed exploded view.
VCD
AB
DVD
ST
ALL MP3
-R W
BIL PR
SAP CH
AM
SP
LP
EP
DVD indicator
CD REC indicator
PROGRAM indicator
Repeat playback
mode indicators
Chapter/Track number indicator
Video CD indicator
A
ng
l
e
i
co
n
i
n
di
cator
Total playing time/elapsed time indicator
s
Title number indicator
Stereo indicator
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VR168 - 923-03485 2-2 D35E COMBO - CHASSIS
CHASSIS
SELF DIAGNOSTICS
SELF DIAGNOSTIC OVERVIEW
Provides service personnel a convenient service aid by a
visual display of error codes generated by the
microcomputer and displayed on the digitron.
OPERATIONAL PROCEDURE
With the remote control, press and hold the “MENU” key
until the word MENU appears in the display. Then press
4, 3, 2, 1 and then “ENTER”. The self diagnostic procedure
will sequence through the 8 step procedure. If an error
is detected, a code number will flash approximately 5
times and then return to its initial mode of operation.
NOTES
1. Error codes will not be stored. The program must be
re-initialized as described in the preceding step.
2. Pin numbers refer to IC501 microcomputer, unless
otherwise stated.
DISPLAY
“D1”
“D2”
“D3”
“D4”
“D5”
“D6”
“D7”
“F1”
•Tape Loading
Error
•Tape Loading
Error
•CST Loading
Error
•CST Loading
Error
•DRUM Motor
Error
•Reel Rotational
Error
•Capstan Motor
Error
•Tuner Signal
Input
•Mode SW
Pos. S1, S2, S3, S4
Pins: 25, 24, 23, 22
•Load Motor
Pins: 60 (+)
Pins: 59 (-)
•Mode SW
Pos. S1, S2, S3, S4
Pins: 25, 24, 23, 22
•Load Motor
Pins: 60
•Mode SW
Pos. S1, S2, S3, S4
Pins: 25, 24, 23, 22
•Load Motor
Pins: 60
•Mode SW
Pos. S1, S2, S3, S4
Pins: 25, 24, 23, 22
•Load Motor
Pins: 60
•Head SW(30Hz)
Pulses Pin18
•Supply Take-up Reel
Pulses, Pins 79, 80
•Capstan FG Pulses
•CVin Pin 56
•Mode SW Position not
changed within 6 seconds
after cassette loading
attempt.
•Mode SW Position not
changed within 6 seconds
after cassette loading
attempt.
•Mode SW Position not
changed within 6 sec-
onds after cassette
loading attempt.
•CST SW must be activat-
ed within 3 seconds, oth-
erwise unit shut down will
occur.
•Drum Motor (Slow Start)
•Motor must be up to
speed within 3 seconds
of operation
•CFG Signal present, but
take-up pulses are mis-
sing.
(Capstan motor running)
•No CFG Signal
•Composite Sync not
detected, RF or Video
Signal loss.
•Loading motor,
mech problems,
gears, timing
•Mode SW Position
•Mode SW Contacts
•Mode SW Contacts
•CST SW or
Connector Contacts
•Drum Motor and
Control Circuits
•Capstan belt
•Idler and reel gears
damaged
•ST/U Sensors
•Capstan control ckt.
•Motor assy.
•IC501 Ckt.
•Loss of C-sync
Tuner Line
Video Path
DESCRIPTION INPUT SIGNAL CIRCUIT STATUS SERVICE POINTS
VCR should be in PB mode for D5, D6 and D7. Stop mode for F1, cassette loading D3, D4 and tape loading D1 and D2.
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VR168 - 923-03485 2-3 D35E COMBO - CHASSIS
CHASSIS
CABINET DISASSEMBLY
CAUTION BEFORE SERVICING
Electronic parts are susceptible to static electricity and
may easily be damaged. Follow proper grounding
procedures.
Many screws are used inside the unit. To prevent missing,
dropping, etc. of the screws, always use a magnetized
screw driver in servicing. Several kinds of screws are used
and some of them need special cautions. That is, take
care of the tapping screws securing molded parts and
fine pitch screws used to secure metal parts. If they are
used improperly, the screw holes will be easily damaged
and the parts can not be fixed.
CABINET DISASSEMBLY
TOP CASE
1. Remove 7 screws (A). (See Fig. 2-1)
2. Pull the top case back and up, in the direction of
the arrow, to disengage it from the front panel.
Fig. 2-1
TRAY DOOR
1. Eject the disc tray.
2. Lift up the tray door in the direction of the arrow.
Fig. 2-2
FRONT PANEL
1. Eject the disc tray. (See Fig. 2-2)
2. Remove the tray door. (See Fig. 2-2)
3. Depress the 7 embossed tabs (see fig. 2-3) and
remove the Front panel.
Fig. 2-3
Tab
Tabs
Tabs
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VR168 - 923-03485 2-4 D35E COMBO - CHASSIS
CHASSIS
CIRCUIT BOARD DISASSEMBLY
Note: Before removing the main circuit board, be sure
to short circuit the laser diode output land. After
replacing the main circuit board, open the land after
inserting the flexible connector.
MAIN CIRCUIT BOARD AND INTERFACE BOARD
1. Remove the top case. (See Fig. 2-1)
2. Remove 14 screws (B).
3. Remove the Deck from the Main Circuit Board.
4. Remove the Main Circuit Board from the Interface
Board.
5. Remove 2 screws (C).
6. Remove the Interface Board from the chassis.
Fig. 2-4
DIGITRON AND KEY CIRCUIT BOARD
1. Remove the front panel. (See Fig. 2-3)
2. Release 3 screws (D), and remove the digitron cir-
cuit board.
Fig. 2-5
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VR168 - 923-03485 3-1 D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING
SECTION 3 Electrical
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
YES
NO
NO
NO
YES
YES
YES
YES
(3) No 5.2V (SYS/Hi-Fi/TUNER)
NO 5.3VA.
Is F101 normal?
Is R101
normal?
Is Bd101
normal?
Is Vcc (8.5~21V)
supplied to IC101 Pin7?
Is the D112 normal?
Is there about 2.5V
at the IC102 Vref?
Is D110 normal?
Check the Main PCB
5.3VA/5.0V Line short?
Replace F101.
Replace
BD101.
Replace R101.
Is D102
normal?
Check or Replace
D102.
Replace D112.
Replace IC102.
Replace the D110.
NO 12VA.
Check or Replace
D110.
Is the Vcc (13V) supplied to (+)
terminal in D115 and D117?
Check or Replace
the Motor Vcc.
Is the Vcc (12V) supplied to (-)
terminal in D115 and D117? Replace D115,
NO 5.2VA.
5.3VA Line Check.
Is 5.3VA put into
Q116 Emitter?
Is about 5V put into
Q116 Base?
Is Q115 Base
“H”?
Check the Power
Control.
Check or Replace Q115,
R160, R161, R162, D122.
Check or Replace
Q115/Q116
1. Power(SMPS) CIRCUI
T
(1) No 5.3VA (SYS/Hi-Fi/TUNER) (2) No 12VA (TO CAP, DRUM MOTOR)
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VR168 - 923-03485 3-2 D35E COMBO - ELECTRICAL
ELECTRICAL
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
YES
YES
NO
YES
YES
NO
NO
YES
YES
YES
Check or Replace
Q115, R157, R158,
R159, D121.
NO 5V.
(4) No 5V (TO DVD)
Is 5.3VA present on
Q113 Emitter?
Check or Replace
Q113/Q115
Is about 5V present on
Q113 Base?
Is the Q115 Base
“H”?
No 33V.
Check the Power
Control.
Is Q115 Base “H”?
Check or Replace
Q114, R154, R155.
(6) No 33V (TUNER)
No REG 12V.
Check or Replace
D110.
Is 13V present on
Q112 Collector?
Is 33V present on
Q112 Base? Check 33V Line.
Check or Replace Q112,
ZD103, R153, C151.
(7) No REG 12V
5.3VA Line Check.
(5) No REG 5V (AVCP)
Check the Power
Control.
5.3VA Line Check.
No REG 5V.
Is 5.3VA present on
Q117 Collector?
Check or Replace Q117,
R167, ZD105, C162.
Is 33V present on
Q117 Base? Check 33V Line.
TROUBLESHOOTING (CONTINUED)
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VR168 - 923-03485 3-3 D35E COMBO - ELECTRICAL
ELECTRICAL
No -29VA.
YES
(
8
)
NO
NO
NO
YES
YES
YES
YES
(9) No 8VA
No 3.3V
YES
YES
YES
(10) No 3.3VA
NO
NO
YES
YES
YES
YES
NO
NO
NO
No -29VA.
Check or Replace
D108.
Is Vcc (4V) supplied
to IC103 Pin1?
Is the Q115 Base
“H”?
Check or Replace
IC103, R156, C153.
Check or Replace
D111.
Check the Power
Control.
NO 8VA.
Check or Replace
D110.
Is Vcc (13V) supplied to
(+) terminal in D114?
Is Vcc (12V) supplied
to IC106 Pin1?
Check or Replace
D114.
Check the Power
Control.
Check or Replace
IC106, R170, C154.
Is Q115 Base
“H”?
NO 2.5VA.
Is Vcc (4V) supplied
to IC104 Pin1?
Is the Q115 Base
“H”?
Is Vcc (3.3V) supplied
to IC104 Pin2?
Check or Replace
D119, C159.
Check or Replace
D111.
Check the Power
Control.
Check or Replace
Ic104.
(11) No 2.5V
TROUBLESHOOTING (CONTINUED)
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VR168 - 923-03485 3-4 D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING (CONTINUED)
YES
YES
YES NO
YES
YES
YES
YES
NO
N O
N O
NO
NO
NO NO
YES
YES YES
2. SYSTEM/KEY CIRCUIT
(1) AUTO STOP
Auto Stop
Does the SW30 waveform
appear at IC501
Pin24?
Do the T-UP Reel Pulses
appear at IC501 Pin4?
Replace Ic501.
(2) The unstable loading of a Cassette tape
Is 12V applied to
PMC01 Pin8?
The unstable loading of a
Cassette tape
Does the “H” signal appear
at Ic501 Pin57 during
inserting the CST ?
Does the “L” signal appear
at Ic501 Pin19 during
inserting the CST?
Check the Deck
Mechanism.
Check the CST SW and
the peripheral circuitry.
Refer to “SMPS DRUM
12 Volt Trouble Shooting”.
Is 5.3V applied to
R544 ?
Refer to SMPS 5.3VA
troubleshooting.
Check IC501
Pins74, 75, 76, 77.
Caution: Auto stop can occur because Grease or Oil is dried up
Check the Drum Motor
signal.
Does 5.2V appear at
RS501?
Check the Q116 Power
Circuit.
Do T/UP Reel Pulses
appear at Q514
Base terminal ?
Replace the T/UP Reel
Sensor (RS501).
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VR168 - 923-03485 3-5 D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING (CONTINUED)
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
Are the connecting patterns and the Components
between IC501 Pin26 and PMC01 Pin11 short?
NO
YES
YES
YES
N O
N O
NO
NO
NO
YES
YES
YES
3. SERVO CIRCUIT
(1) Unstable Video in PB MODE
Unstable Video in
PB Mode.
Does the Noise level of the
screen change periodically?
Do the CTL pulses appear
at IC501 Pin37?
Does the CFG waveform
appear at IC501
Pin40?
On tracking do the CTL
pulses move?
Does the Video Envelope
waveform appear at
IC501 Pin12?
Replace 501.IC
(2) When the Drum Motor
doesn’t run.(2)
When the Drum Motor
doesn’t run,
Does 12V appear at
PMC01 Pin8?
Does 2.8V appear at
PMC01 Pin12?
Check the connector
(PMC01) and the Drum
Motor Ass’y.
Is the adjustment height of
the CTL Head accurate?
Replace 501.IC
Refer to “When the Y signal
doesn’t appear on the
screen in PB Mode”.
Refer to “(2)
No 12VA of Power section”
Do the Drum PWM Pulses
appear at 501
Pin26?
IC
Are the foil patterns and
the Components between
IC501 Pin26 and PMC01
Pin12 short?
Do the DFG Pulses appear
at the IC501 Pin38?
Do the Drum PWM Pulses
appear at 501
Pin26?
IC
Readjust the height of the
CTL Head
Do the DFG Pulses appear
at PMC01 Pin11?
Replace the Cap M.
Aren’t the foil patterns and
the Components between
IC501 Pin 38 and PMC01
Pin11 short?
Replace 501.IC
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VR168 - 923-03485 3-6 D35E COMBO - ELECTRICAL
ELECTRICAL
NO
NO
NO
YES
YES
YES
YES
YES
NO
NO
YES
NO
(3) When the Capstan Motor doesn’t run
Does 12VA appear at PMC01?
When the Capstan Motor doesn’t run,
Does 2.8V appear at PMC01?
Check PMC01 and the Capstan
Motor Ass’y.
Does the Capstan PWM signal appear at
IC501 Pin25?
Are the foil patterns and Components
between IC501 Pin25 and PMC01
Pin9 short?
Does the CFG signal come into
IC501 Pin40?
Are the foil patterns and Components
between IC501 Pin 25 and PMC01
Pin9 short?
Does the CFG signal appear at
PMC01 Pin1?
Does the PWM signal appear at
IC501 Pin25?
Replace IC501.
Refer to “SMPS (CAPSTAN/12Volt)
Trouble Shooting”.
Are the foil patterns and component
between IC501 Pin40 and PMC01
Pin1 short?
Check the Capstan Motor Ass’y.
TROUBLESHOOTING (CONTINUED)
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VR168 - 923-03485 3-7 D35E COMBO - ELECTRICAL
ELECTRICAL
TROUBLESHOOTING (CONTINUED)
(3)
KEY doesn't work.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
N O
NO
YES
NO
N O
Replace the defective
switches.
KEY doesn’t work.
Is 5V applied to
IC501 Pin 15?
Does LED or FLD change
when a function button is
pressed?
Refer to “SMPS 5.3VA
Trouble Shooting”.
4. OSD CIRCUIT
1) No OSD display.
2) No F.OSD display.
No OSD display.
Is 5.3V applied to
IC501 Pin 42?
Does oscillation occur at
IC501 Pins 52, 53?
Does oscillation occur at
IC501 Pins 50, 51?
Replace IC501.
No F.OSD display.
Refer to “(1) No OSD
display”.
Does the C.SYNC signal
appear at IC501 Pin87?
Replace IC501.
(3) I2C BUS CHECK
Check or Replace the
Peripheral Circuitry. (L506,
R517, C519, C518, R518)
The I2C waves don’t
come out.
Does Power appear at
the Pull up impedence
(R508, R510)?
Replace IC501.
Refer to “SMPS 5.3VA
Trouble Shooting”.
Is the oscillation input to
Q501 base?
Refer to “AVCP. C. Sync.
Trouble shooting”.
Check or Replace the
Peripheral Circuitry. (L506,
R517, C519, C518, R518)
Check whether X301
oscillates
Refer to “SMPS 5.3VA
Trouble Shooting”.
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VR168 - 923-03485 3-8 D35E COMBO - ELECTRICAL
ELECTRICAL
YES
YES
YES
YES YES
YES
YES
No Video in EE Mode
Does the Video signal
appear at IC301
Pins28, 30, 31?
Is 5.2V applied to IC301
Pins12, 36, 61, 67, 90, 96?
Does the Video signal
appear at IC301 Pin 52?
Does the Video signal
appear at IC501 Pin 45?
Does the Video signal
appear at the Emitter
terminal of Q801?
Check DVD Video Input (IC802, Pin29), Tuner Video Input
(TU701 Pin24), Line Video Input (JK801), respectively.
Check the REG 5V Line.
(Power Circuit)
Is I2C BUS signal applied to
IC301 Pins 62, 63?
Check the path of the signal
between Ic301 Pin
52 and IC501 Pins 43, 45.
Is there 12V on the plus
terminal of C822?
Replace Q801.
Check C330. (AGC)
Replace IC301.
Check the REG 12V Line.
(Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I2C BUS
CHECK Trouble Shooting’)
5. Y/C CIRCUIT
(1) No Video in EE Mode
DVD TROUBLESHOOTING (CONTINUED)
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