Sony DE-900 Service manual
D-E900/E905
SERVICE MANUAL
Photo: D-E900
SPECIFICATIONS
US Model
AEP Model
UK Model
E Model
Australian Model
D-E905
Tourist Model
D-E900
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM-2501DCA
Optical Pick-Up Name DAX-01D
MICROFILM
• Abbreviation
E13 : 220-230 V AC area in E model
HK : Hong Kong
JEW : Tourist
AUS : Australian
COMPACT DISC COMPACT PLAYER
TABLE OF CONTENTS
1. SERVICING NOTES ................................................ 3
2. GENERAL ................................................................... 4
3. DISASSEMBLY ......................................................... 7
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 270 ˚C during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
4. SERVICE MODE....................................................... 8
5. ELECTRICAL ADJUSTMENTS......................... 9
6. DIAGRAMS
6-1. Block Diagram ................................................................ 13
6-2. Printed Wiring Board ...................................................... 16
6-3. Schematic Diagram ......................................................... 19
6-4. IC Pin Function Description ........................................... 28
7. EXPLODED VIEWS ................................................ 30
8. ELECTRICAL PARTS LIST ............................... 33
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be damaged by heat.
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
– 2 –
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK ! OR DOTTED
LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
SECTION 1
SERVICING NOTES
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic breakdown because of the potential difference generated by
the charged electrostatic load, etc. on clothing and the human body .
During repair, pay attention to electrostatic breakdown and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
Befor Replacing the Optical Pick-Up Block
Please be sure to check thoroughly the parameters as par the “Optical Pick-Up Block Checking Procedures” (Part No.: 9-960-027-
11) issued separately before replacing the optical pick-up block.
Note and specifications required to check are given below.
• FOK output: IC501 !™ pin
When checking FOK, remov the lead wire to disc motor.
• S curve P-to-P value: 2.5 Vp-p IC501 #¡ pin
When checking S curve P-to-P value, remove the lead wire to
disc motor.
• RF signal P-to-P value: 0.8 - 1.2 Vp-p
• Traverse signal P-to-P value: 1 - 2.6 Vp-p
• The repairing grating holder is impossible.
• Adjusted part for tracking gain adjustment: RV504
NOTES ON LASER DIODE EMISSION CHECK
The laser beam on this model is concentrated so as to be focused
on the disc reflective surface by the objective lens in the optical
pick-up block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper panel is closed while turning
ON the S809 (push switch type).
The following two checking methods for the laser diode are operable.
• Method (In the service mode or normal operation):
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. Push the S809 as shown in Fig. 1.
3. Press the ^ key.
4. Check the object lens for confirming normal emission of the
laser diode. If not emitting, there is a trouble in the automatic
power control circuit or the optical pick-up.
During normal operation, the laser diode is turned ON about
10 seconds for focus searching.
– 3 –
S809
Fig. 1 Method to push the S809
This section is extracted from
instruction manual.
SECTION 2
GENERAL
– 4 –
– 5 –
– 6 –
SECTION 3
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
BOTTOM PANEL
4
1
three screws
×
7)
(B1.7
EBP terminal ass’y
1
three screws
(B1.7
×
7)
2
claw
2
two claws
NOTE FOR INSTALLATION
Note: Follow the assembly procedure in the numerical order given.
• MAIN BOARD
On installation main board adjust the
S301, 805, 807, and knob (A VLS, RESUME, ESP).
S301
3
bottom panel
S807
main board
bottom panel
– 7 –
S805
knob (AVLS)
knob (RESUME)
2
knob (ESP)
1
3
• CABINET ASS’Y
s
On installation cabinet ass’y adjust the
S806 and knob (HOLD).
1
• UPPER PANEL ASS’Y
2
3
S806
knob (HOLD)
three screws
×
7)
(B1.7
cabinet ass’y
three screw
(B1.7 × 7)
main board
5
boss
3
2
boss
upper panel ass’y
1
4
Push the upper panel ass’y to
arrow direction.
switching arm ass’y
– 8 –
SECTION 4
SERVICE MODE
Service Mode (Service program)
The equipment is provided with a service program built in the
microcomputer, like conventional models.
Service program operation methods are described in the following.
*Operation is all controlled by the remote commander.
PLAY MODE
Tracking servo and sled
p
(STOP)
Indication is stopped
while pressing
=
(FR)
The optical pick-up
is moved inwardly
servo are turned ON
(
(PLAY)
Focus is turned ON to
effect draw-in mode
+
(FF)
The optical pick-up
is moved outwardly
HOLD
Be sure to turn OFF
the HOLD switch
(If ON, pressing each
key is deactivated)
6. By pr essing the p key, all servos (focus, tracking and sled)
are turned OFF. However, the disc motor revolves for a while
by inertia.
• Step 3 (Resetting of service mode)
1. Be sure to disconnect the external power supply and remove
the solder bridge at the TEST (TP801) terminals connected
before in setting.
2. The set thus becomes available for normal operation.
– MAIN BOARD – (Side A)
TP801
(TEST)
Descriptions in [ ] indicate major operations in the service mode.
For more information, see Step 2.
Fig. 1 Layout of each key
• Step 1 (Service mode setting methods)
1. Turn OFF the HOLD switch with external power supply disconnected (power is not applied to the set).
2. Solder across the TEST (TP801) terminals (pin @ª, IC801
(TEST) is grounded).
3. Connect an external power supply.
Thus, the set is switched to the service mode.
• Step 2 (Operation in the service mode)
1. Once the service mode is effected, the LCD displays 3 indications each of which is repeatedly displayed.
However, the following operations can be activated even if
LCD indication is effected.
2. By pressing the p key, all indications light up.
With the key released, repeated indication is continued, so you
can check each segment.
3. When continuously pressing the ( (+) or = key on
the remote commander, the optical pick-up is mov able inwardly
or outwardly. However, if this is activated, tracking servo and
sled servo are turned OFF. After the optical pick-up moves,
without disc, focus searching is repeated continuously.
If a disc has been loaded,, focus is turned ON from focus searching while entering CLV-S (pull-in mode).
4. By pressing the PLAY MODE key, tracking servo, sled servo
and CLV-A (servo in PLAY) are turned ON.
5. When 4. are performed, playing begins. No muting is ON in
the service mode.
Fig. 2 Location of Test terminal
– 9 –
SECTION 5
ELECTRICAL ADJUSTMENTS
Precautions for Adjustment
1. Before beginning tracking balance adjustment, set the equipment to service mode.
After the completion of adjustment, be sure to reset the service mode.
For more information, see “Service Mode (service program)”
on page 9.
2. Perform adjustments in the order given.
3. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indi- cated.
4. Power supply voltage requirement.: DC 4.5 V
HOLD switch : OFF
VOLUME switch: Minimum
RESUME switch : OFF
ESP switch : OFF
AVLS switch : OFF
5. For adjustment, the remote comcommander is required.
Before Beginning Adjustment
Set the equipment to service mode (See page 9) and check the
following. If there is an error, repair the equipment.
• Checking of the sled motor
1. Open the upper panel.
2. When continuously pressing ( (+) or = key on the
remote commander, and check that the optical pick-up can
move smoothly without sluggishness or abnormal noise in innermost periphery → outermost periphery → innermost periphery. (At this time, the PLAY status is active.)
( (+) key on the remote commander:The optical pick-up
moves outwardly.
= key on the remote commander: The optical pick-up moves
in- wardly.
Focus bias Check
Condition:
• Hold the set in horizontal state.
Check Procedure:
oscilloscope
(AC range)
MAIN board
TP536 (RFO)
TP537 (VC)
(See page 12)
2 k
Ω
+
–
1. Set the equipment to service mode stop state. (See page 9.)
2. Connect the oscilloscope to the test point TP536 (RFO) of the
MAIN board.
3. Move the optical pick-up to the center by pressing the (
(+) and = keys.
4. Put the disc (YEDS-18).
5. Press the ^ key.
From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.
6. Press the PLA Y MODE key . (Both tracking and sled ar e turned
ON.)
7. Check the oscilloscope waveform is as shown below.
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.
RF SIGNAL REFERENCE W A VEFORM (EYE PATTERN)
VOLT/DIV : 200 mV (With the 10:1 probe in use)
TIME/DIV : 500 ns
• Checking of focus searching
1. Open the upper panel.
2. Press the ( (+) key on the remote commander. (Focus
searching operation is activated continuously.)
3. Check the object lens of the optical pick-up for smooth up/
down motion without sluggishness or abnormal noise.
4. Press the p key.
Check that focus searching operation is deactivated. If not,
again press the p key slightly longer.
VCC Adjustment
Adjustment Procedure:
digital voltmeter
(DC range)
MAIN board
L401 (RV301 side)
(See page 12)
+
–
1. Set the equipment to service mode stop state. (See page 9.)
2. Connect the digital voltmeter to L401 (RV301 side) of the
MAIN board.
3. Adjust RV401 on the MAIN board so that the reading on digital voltmeter goes 2.7 to 2.8 V.
4. After the completion of adjustment, reset service mode. (See
page 9.)
RF level
1.0 ± 0.2 V
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy watching.
8. Stop revolving of the disc motor by pressing the p key.
9. After the completion of adjustment, reset service mode. (See
page 9.)
Check Location: MAIN Board (See page 12.)
Adjustment Location: MAIN board (See page 12)
– 10 –
Loading...