Toshiba D-R4SU User manual

DVD VIDEO RECORDER
SERVICE MANUAL
Mar., 2005
S
FILE NO. 810-200531
D-R4SU
D-R4SC
D-KR4SU
DIGITAL VIDEO

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 SI and IC are same as above.
1M W
Ground conductive
wrist strap for body.
Soldering iron
with ground wire
or ceramic type
Conductive mat The ground resistance
between the ground line
and the ground is less than 10 W .
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.
·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, nc.
·Manufactured under license from QSound Labs, nc. U.S. patent Nos. 5,105,462, 5,208,860 and 5,440,638 and various foreign counterpart. Copyright
QSound Labs, nc. 1998-2002. QXpanderTM is a trademark of QSound Labs, nc. All rights reserved.

SAFETY NOTICE
SAFETY PRECAUTIONS
LEAKAGE CURRENT CHECK
Plug the AC line cord directly into a 12 V AC outlet (do
not use an isolation transformer for this check). Use an
AC voltmeter, having 5 W per volt or more sensitivity.
Connect a 15 W 1 W resistor, paralleled by a .15 mF
15 V 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.).
Measure the AC voltage across the 15 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 .3 V. A reading
exceeding .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.
READING SHOULD NOT EXCEED 0.3V
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.
DVD VIDEO RECORDER AC VOLTMETER
(5000 W per volt
or more sensitivity)
Good earth ground
such as a water pipe,
conduit, etc.
1500 W
10 W
0.15 m F 150V AC
AC OUTLET
Test all exposed metal.
Voltmeter Hook-up for eakage Current Check

SECTION 2
PART REPLACEMENT AND ADJUSTMENT PROCEDURES
SECTION 3
SERVICING DIAGRAMS
1. CIRCUIT SYMBOLS AND
SUPPLEMENTARY EXPLANATION
1-1. Precau ions for Par Replacemen
1-2. Solid Resis or Indica ion
1-3. Capaci ance Indica ion
1-4. Induc or Indica ion
1-5. Waveform and Vol age Measuremen
1-6. O hers
2. PRINTED WIRING BOARD AND
SCHEMATIC DIAGRAM
3. BLOCK DIAGRAMS
3-1. Overall Block Diagram
4. CIRCUIT DIAGRAMS
4-1. Power Supply Circui Diagram
4-2. Fron Circui Diagram
4-2-1. Fron Jack Circui Diagram
4-2-2. Fron (LED) Circui Diagram
4-2-2. Fron (L) Circui Diagram
4-2-3. Fron (R) Circui Diagram
4-3. Digi al Circui Diagram
4-3-1. Digi al 1 Circui Diagram
4-4. Mo her Circui Diagram
4-4-1. Tuner Circui Diagram
4-4-2. Timer Circui Diagram
4-4-3. Audio Circui Diagram
4-4-4. Video Circui Diagram
4-3. Tuner Uni Circui Diagram
5. PC BOARDS
5-1. Fron Jack PC Board
5-2. Fron (LED) PC Board
5-3. Fron (L) PC Board
5-4. Fron (R) PC Board
5-5. Tuner Uni PC Board
5-6. Digi al PC Board
5-7. Mo her PC Board
CONTENTS
SECTION 1
GENERAL DESCRIPTIONS
1. OPERATING INSTRUCTIONS
1. REPLACEMENT OF MECHANICAL PARTS
1-1. Cabine Replacemen
1-1-1. Top Cover
1-1-2. Fron Panel
1-1-3. RAM Diver
1-1-4. Rear Panel
1-1-5. Fan
1-2. PC Board Replacemen
1-2-1. Tuner Uni PC Board
1-2-2. Digi al PC Board
1-2-3. Mo her PC Board
1-2-4. Power PC Board
1-2-5. Fron (R), Fron (L), Fron (LED), and
Fron Jack PC Board
2. WIRING CONNECTION DIAGRAM
2. LOCATION OF MAIN PARTS
2-1. Loca ion of Main Par s
2-2. Loca ion of PC Boards
SECTION 4
PARTS LIST
SAFETY PRECAUTION
NOTICE
ABBREVIATIONS
1. EXPLODED VIEWS
1-1. Packing Assembly
1-2. Chassis Assembly
2. PARTS LIST

SECTION 1
GENERAL DESCRIPTIONS
1. OPERATING INSTRUCTIONS
Please refer to the owner's manual about the contents.
SECTION 1
GENERAL DESCRIPTIONS

2. LOCATION OF MAIN PARTS
2-1. Location of Main Parts
Fig. 1-2-1
2-2. Location of PC Boards
Fig. 1-2-2
ZG45 FAN
RAM1 RAM DRIVE
EU05 Mother PC board
EU05A Tuner Unit PC board
EU01 Digital PC board
EU02 Power PC board
EU03A Front (R) PC board
EU55 Front Jack PC board
EU03B Front (L)
PC board
EU56 Front (LED)
PC board

1-1. Cabinet Replacement
1-1-1. Top Cover
1. Remove five screws (1), then remove the top cover (2).
Fig. 2-1-1
SECTION 2
PART REPLACEMENT AND
ADJUSTMENT PROCEDURES
Screws (1)
Screw (1)
Screw (1)
Top cover (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.
any 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

1-1-2. Front Panel
1. Remove the top cover. (Refer to item 1-1-1.)
2. Disconnect three connectors (1).
3. Remove one screw (2) and the earth lead.
4. Remove two screws (3) and four claws, then remove the front panel (4).
Fig. 2-1-2
1-1-3. RAM Dr ve
1. Remove the front panel. (Refer to item 1-1-2.)
2. Disconnect the flexible cable (1) and connector (2).
3. Remove three screws (3) and the screw (4), then remove the RA drive (5).
4. Remove the shield cover (6).
Note:
• After replacing, attach the tape (1) to its original position.
Fig. 2-1-3
Connector (1) Connector (1)
Connector (1)
Screws (3)
Screws (2)
Earth
Front panel (4)
Claw
Claw
Claws
Flexible
cable (1)
Connector (2)
Screws (3)
Screw (4)
RAM drive (5)
Shield cover (6)

1-1-4. Rear Panel
1. Remove the top cover. (Refer to item 1-1-1.)
2. Remove the screw (1) and seven screws (2).
3. Remove the bush from the rear panel (3).
4. Remove two claws, then remove the rear panel (3).
5. Remove two screws (4), then remove the fan (5).
Fig. 2-1-4
1-1-5. Fan
1. Remove the top cover. (Refer to item 1-1-1.)
2. Peel off the tape (1).
3. Disconnnect two connectors (2).
4. Remove two screws (3), then remove the fan (4).
Fig. 2-1-5
Screw (1)
Screws (2)
Screws (4)
Fan (5)
Rear panel (3)
Claw
Claw
Bush
Screws (3)
Connectors (2)
Fan (4)
Tape (1)
Hexagonal
nuts

1-2. PC Board Replacement
1-2-1. Tuner Un t PC Board
1. Remove the top cover. (Refer to item 1-1-1.)
2. Disconnect the flexible cable (1).
3. Remove the screw (2) and the screw (3).
4. Remove the claw, then remove the Tuner Unit PC board (4).
Screw (2)
Tuner Unit
PC board (4)
Screw (3)
Claw
Flexible
cable (1)
1-2-2. D g tal PC Board
1. Remove the top cover. (Refer to item 1-1-1.)
2. Peel off the tape (1).
2. Disconnect the flexible cable (2).
3. Remove four screws (3), then remove the Digital PC board (4).
Note:
• The Digital PC board (4) is connected to the other PC board (5) by three connectors (6). Take notice when removing.
Fig. 2-1-7
Fig. 2-1-6
Screws (3)
Digital PC
board (4)
Flexible
cable (2)
Tape (1)
Flexible
cable (2)
Connector
Claw
Connector (6) Connectors (6)
Mother PC board (5)
Remove the connector claw
in the direction indicated
by the arrows to release the
flexible cable.