Toshiba DKR-4, DR-4 Service manual
SERVICE MANUAL
DOCUMENT CREATED IN JAPAN, Jul., 2005
DIGITAL VIDEO
DVD VIDEO RECORDER
FILE NO. 810-200531
D-R4SU
D-R4SC
D-KR4SU
Mar., 2005
S
LASER BEAM CAUTION LABEL
When the power supply is being turned on, you may not remove this laser cautions label. If it removes, radiation of a laser
may be received.
PREPARATION OF SERVICING
Pickup Head consists of a laser diode that is very susceptible to external static electricity.
Although it operates properly after replacement, if it was subject to electrostatic discharge during replacement,
its life might be shortened. When replacing, use a conductive mat, soldering iron with ground wire, etc. to
protect the laser diode from damage by static electricity.
And also, the LSI and IC are same as above.
Ground conductive
wrist strap for body.
Soldering iron
with ground wire
or ceramic type
1M
W
Conductive mat
Manufactured under license from Dolby Laboratories. “Dolby” and the double-D symbol are trademarks of Dolby Laboratories.
·
“DTS” and “DTS Digital Out” are trademarks of Digital Theater Systems, Inc.
·
Manufactured under license from QSound Labs, Inc. U.S. patent Nos. 5,105,462, 5,208,860 and 5,440,638 and various foreign counterpart. Copyright
·
QSound Labs, Inc. 1998-2002. QXpanderTM is a trademark of QSound Labs, Inc. All rights reserved.
The ground resistance
between the ground line
and the ground is less than 10W.
SAFETY NOTICE
SAFETY PRECAUTIONS
LEAKAGE CURRENT CHECK
Plug the AC line cord directly into a 120V AC outlet (do
not use an isolation transformer for this check). Use an
AC voltmeter, having 5000 W per volt or more sensitivity.
Connect a 1500 W 10 W resistor, paralleled by a 0.15 mF
150V AC capacitor between a known good earth ground
(water pipe, conduit, etc.) and all exposed metal parts of
cabinet (antennas, handle bracket, metal cabinet
screwheads, metal overlays, control shafts, etc.).
READING SHOULD NOT EXCEED 0.3V
Measure the AC voltage across the 1500 W resistor.
The test must be conducted with the AC switch on and
then repeated with the AC switch off. The AC voltage
indicated by the meter may not exceed 0.3 V. A reading
exceeding 0.3 V indicates that a dangerous potential
exists, the fault must be located and corrected.
Repeat the above test with the DVD VIDEO RECORDER
power plug reversed.
NEVER RETURN A DVD VIDEO RECORDER TO
THE CUSTOMER WITHOUT TAKING NECESSARY
CORRECTIVE ACTION.
DVD VIDEO RECORDER
AC OUTLET
Test all exposed metal.
Voltmeter Hook-up for Leakage Current Check
AC VOLTMETER
(5000Wper volt
or more sensitivity)
Good earth ground
such as a water pipe,
W
conduit, etc.
1500
10 W
0.15mF 150V AC
The lightning flash with arrowhead symbol, within an
equilateral triangle, is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the
product’s enclosure that may be of sufficient magnitude to
constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the appliance.
1. OPERATING INSTRUCTIONS
CONTENTS
SECTION 1
GENERAL DESCRIPTIONS
2. LOCATION OF MAIN PARTS
2-1. Location of Main Parts
2-2. Location of PC Boards
PART REPLACEMENT AND ADJUSTMENT PROCEDURES
1. REPLACEMENT OF MECHANICAL PARTS
1-1. Cabinet Replacement
1-1-1. Top Cover
1-1-2. Front Panel
1-1-3. RAM Diver
1-1-4. Rear Panel
1-1-5. Fan
1. CIRCUIT SYMBOLS AND
SUPPLEMENTARY EXPLANATION
1-1. Precautions for Part Replacement
1-2. Solid Resistor Indication
1-3. Capacitance Indication
1-4. Inductor Indication
1-5. Waveform and Voltage Measurement
1-6. Others
2. PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM
3. BLOCK DIAGRAMS
3-1. Overall Block Diagram
4. CIRCUIT DIAGRAMS
4-1. Power Supply Circuit Diagram
4-2. Front Circuit Diagram
4-2-1. Front Jack Circuit Diagram
4-2-2. Front (LED) Circuit Diagram
4-2-2. Front (L) Circuit Diagram
4-2-3. Front (R) Circuit Diagram
SECTION 2
1-2. PC Board Replacement
1-2-1. Tuner Unit PC Board
1-2-2. Digital PC Board
1-2-3. Mother PC Board
1-2-4. Power PC Board
1-2-5. Front (R), Front (L), Front (LED), and
Front Jack PC Board
2. WIRING CONNECTION DIAGRAM
SECTION 3
SERVICING DIAGRAMS
4-3. Digital Circuit Diagram
4-3-1. Digital 1 Circuit Diagram
4-4. Mother Circuit Diagram
4-4-1. Tuner Circuit Diagram
4-4-2. Timer Circuit Diagram
4-4-3. Audio Circuit Diagram
4-4-4. Video Circuit Diagram
4-3. Tuner Unit Circuit Diagram
5. PC BOARDS
5-1. Front Jack PC Board
5-2. Front (LED) PC Board
5-3. Front (L) PC Board
5-4. Front (R) PC Board
5-5. Tuner Unit PC Board
5-6. Digital PC Board
5-7. Mother PC Board
SAFETY PRECAUTION
NOTICE
ABBREVIATIONS
SECTION 4
PARTS LIST
1. EXPLODED VIEWS
1-1. Packing Assembly
1-2. Chassis Assembly
2. PARTS LIST
GENERAL DESCRIPTIONS
SECTION 1
GENERAL DESCRIPTIONS
1. OPERATING INSTRUCTIONS
Please refer to the owner's manual about the contents.
SECTION 1
2. LOCATION OF MAIN PARTS
2-1. Location of Main Parts
RAM1 RAM DRIVE
ZG45 FAN
2-2. Location of PC Boards
EU01 Digital PC board
EU03B Front (L)
PC board
Fig. 1-2-1
EU05A Tuner Unit PC board
EU05 Mother PC board
EU56 Front (LED)
PC board
EU55 Front Jack PC board
EU02 Power PC board
EU03A Front (R) PC board
Fig. 1-2-2
SECTION 2
PART REPLACEMENT AND
ADJUSTMENT PROCEDURES
CAUTIONS BEFORE STARTING PART REPLACEMENT
Electronic parts are susceptible to static electricity and may easily damaged, so do not forget to ground as required.
Many screws are used inside the unit. To prevent the screws from missing or dropping, etc. always use a magnetized
screwdriver 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.
1. REPLACEMENT OF MECHANICAL PARTS
ADJUSTMENT PROCEDURES
PART REPLACEMENT AND
1-1. Cabinet Replacement
1-1-1. Top Cover
1. Remove five screws (1), then remove the top cover (2).
Screw (1)
Top cover (2)
SECTION 2
Screws (1)
Screw (1)
Fig. 2-1-1
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