Toshiba SD-H400 - Combination Progressive-Scan DVD... User manual

DIGITAL MEDIA SERVER
SERVICE MANUAL
FILE NO. 810-200329
SD-H400
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 LSI 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 .

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 Wper volt or more sensitivity.
Connect a 1500 W10 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.).
Measure the AC voltage across the 1500 Wresistor.
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 PLAYER
power plug reversed.
NEVER RETURN A DVD VIDEO PLAYER 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 PLAYER 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 Leakage Current Check

SECTION 2
PART REPLACEMENT AND ADJUSTMENT PROCEDURES
SECTION 3
SERVICING DIAGRAMS
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. DVD Overall Block Diagram
3-2. Power Supply Block Diagram
3-3. KDB Front, Power Switch Block Diagram
3-4. Logical System Block Diagram (DVD)
3-5. Output Block Diagram (DVD)
3-6. Tivo Block Diagrams
3-6-1. Tivo Block Diagram1
3-6-1. Tivo Block Diagram2
4. CIRCUIT DIAGRAMS
4-1. Power Supply Circuit Diagram
4-2. KDB Front Circuit Diagram
4-3. Power Switch Circuit Diagram
4-4. DVD Main Circuit Diagram
4-5. Tivo Circuit Diagrams
5. PC BOARDS
5-1. Power Switch PC Board
5-2. KDB Front PC Board
5-3. DVD Main PC Board
CONTENTS
SECTION 1
GENERAL DESCRIPTIONS
1. OPERATING INSTRUCTIONS
1. Replacement of Mechanical Parts
1-1. Cabinet Replacement
1-1-1. Top Cover
1-1-2. HDD
1-1-3. Front Panel
1-1-4. Tray Door
1-1-5. Mechanism Chassis Assembly
1-1-6. Fan
1-1-7. Rear Panel
1-2. PC Board Replacement
1-2-1. DVD Main PC Board
1-2-2. Tivo PC Board
1-2-3. Power PC board
1-2-4. KDB Front and Power Switch PC Board
2. LOCATION OF MAIN PARTS AND
MECHANISM PARTS
2-1. Location of Main Parts
2-2. Location of PC Boards
SECTION 4
PARTS LIST
SAFETY PRECAUTION
NOTICE
ABBREVIATIONS
(1) Integrated Circuit (IC)
(2) Capacitor (Cap)
(3) Resistor (Res)
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 AND MECHANISM PARTS
2-1. Location of Main Parts
Fig. 1-2-1
2-2. Location of PC Boards
Fig. 1-2-2
B903 FAN
HDD UNIT
MD01
Mechanism chassis
assembly
UT01 Tivo Main board
U801 Power PC board
UD01 DVD Main PC board
UX02 KDB Front PC board
UX03 Power Switch
PC board

SECTION 2
PART REPLACEMENT AND
ADJUSTMENT PROCEDURES
CAUTIONS BEFORE STARTING SERVICING
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, 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. Cabinet Replacement
1-1-1. Top Cover
1. Remove seven screws (1), then remove the top cover
(2).
Fig. 2-1-1
1-1-2. HDD
1. Disconnect a connector (1).
2. Remove four screws (2) and a connector (3), then
remove the HDD (4).
Fig. 2-1-2
SECTION 2
PART REPLACEMENT AND
ADJUSTMENT PROCEDURES
Screws (1)
Screws (1)
Screws (1)
Top cover (2)
Connector (1)
Connector (3)
Screws (2)
HDD (4)

1-1-5. Mechanism Chassis Assembly
Note:
• Before removing the Mechanism chassis assembly (6),
be sure to short-circuit the laser diode output land.
After replacing the Mechanism chassis assembly (6)
and inserting the flexible cables (1), open the land as it
was.
1. Remove the front panel. (Refer to item 1-1-3.)
2. Disconnect three flexible cables (1).
3. Peel off the tape (2) from the mechanism assembly
cover (4).
4. Remove four screws (3), then remove the mechanism
chassis assembly cover (4).
5. Remove four screws (5) , then remove the mechanism
chassis assembly (6).
Fig. 2-1-5
1-1-3. Front Panel
1. Remove the top cover. (Refer to item 1-1-1.)
2. Remove the HDD. (Refer to item 1-1-2.)
3. Disconnect two flexible cadles (1).
4. Remove three screw (2).
5. Release five claws, then remove the front panel (3).
Fig. 2-1-3
1-1-4. Tray Door
1. Remove a spring (1).
2. Remove the tray door (2) while slightly bending it.
Fig. 2-1-4
Flexible
cable (1)
Flexible cable (1)
Screws (2)
Screws (2)
To DVD Main
PC board
Front panel (3) Claw
Claw
Claws
Spring (1)
Tray door (2)
Screws (3)
Mechanism chassis
assembly (6)
Flexible
cables (1)
Screws (5)
Tape (2)
Mechanism
chassis assembly
cover (4)
Pickup head
Laser diode
output lands

1-1-6. Fan
1. Remove a connector (1) and two screws (2) .
2. Remove the fan (3).
Fig. 2-1-6
Fan (3)
Screws (2)
Connector (1)
Screws (1)
Rear panel (2)
Claw
Claw
1-1-7. Rear Panel
1. Remove ten screws (1).
2. Loosen two claws and remove the rear panel (2).
Fig. 2-1-7

TO CNX01
(Tivo PC board)
To CTN21
(Tivo PC board)
To CTY01
(Tivo PC board)
To Pickuphead
To Loading
motor
To Stepper
To PX02
(KDB Front PC board)
CN603 CN601 CN502
CN503
CN501
IC503
IC502
CN901
CN302 CN701
CN103
IC401 IC306
IC305
Main PC board
Power PC board
Note:
• For the detailed information about DVD Main PC
board connection, see Fig. 2-1-9.
Fig. 2-1-9
1-2. PC Board Replacement
1-2-1. DVD Main PC Board
Note:
• Before removing the DVD main PC board (4), be sure
to short-circuit the laser diode output land.
After replacing the DVD main PC board (4) and
inserting the flexible cables (2), open the land as it
was.
1. Remove the top cover. (Refer to 1-1-1.)
2. Disconnect a connector (1).
3. Remove seven flexible cables (2).
4. Remove four screws (3), then remove the DVD main
PC board (4).
Fig. 2-1-8
Connector (1)
Flexible cables (2)
Flexible cable (2)
Flexible
cables (2)
Screws (3)
DVD main
PC board (4)
Pickup head
Laser diode
output lands