Sony D-EJ815 Service Manual
D-E880/EJ815
SERVICE MANUAL
Ver 1.0 1999. 10
Photo: D-EJ815 Silver model
Chinese Model
Tourist Model
Model Name Using Similar Mechanism NEW
CD Mechanism Type
Optical Pick-Up Name
US : CDM-3022EBG
Other : CDM-3022EBA
US : DAX-22G
Other : DAX-22E
US Model
E Model
D-EJ815
D-E880
SPECIFICATIONS
MICROFILM
PORTABLE CD PLAYER
TABLE OF CONTENTS
1. SERVICING NOTES............................................... 3
2. GENERAL ................................................................... 4
3. DISASSEMBLY ......................................................... 5
4. ELECTRICAL ADJUSTMENTS......................... 7
This appliance is classified as a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
5. DIAGRAMS
5-1. Block Diagram – MAIN Section (1/2) – ........................ 9
5-2. Block Diagram – MAIN Section (2/2) – ........................ 11
5-3. Block Diagram – POWER SUPPLY Section – .............. 13
5-4. Printed Wiring Board ...................................................... 16
5-5. Schematic Diagram ......................................................... 19
5-6. IC Pin Function Description ........................................... 27
6. EXPLODED VIEWS ................................................ 29
7. ELECTRICAL PARTS LIST ............................... 32
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
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.
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.
– 2 –
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIA GRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANU AL OR IN SUPPLEMENTS PUBLISHED BY SONY.
SECTION 1
detection lever
detection lever
S801
main board
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: IC601 eg pin
When checking FOK, remove the lead wire to disc motor.
• RF signal P-to-P value: 0.35 to 0.65 Vp-p
Precautions for Checking Emission of Laser Diode
Laser light of the equipment is focused by the object lens in the
optical pick-up so that the light focuses on the reflection surface
of the disc. Therefore, be sure to keep your eyes more then 30 cm
apart from the object lens when you check the emission of laser
diode.
Laser Diode Checking Methods
During normal operation of the equipment, emission of the laser
diode is prohibited unless the upper lid is closed while turning ON
the S801. (push switch type)
The following two checking methods for the laser diode are operable.
• Method:
Emission of the laser diode is visually checked.
1. Open the upper lid.
2. W ith a disc not set, turn on the S801 with a scre wdriver ha ving
a thin tip as shown in Fig.1.
Note: Do not push the detection lever strongly , or it may be bent or dam-
aged.
3. Press the u button.
4. Observing the objective lens, check that the laser diode emits
light.
When the laser diode does not emit light, automatic power
control circuit or optical pickup is faulty.
In this operation, the objective lens will move up and down 5
times along with inward motion for the focus search.
Fig. 1 Method to push the S801
– 3 –
SECTION 2
GENERAL
This section is extracted from
instruction manual.
– 4 –
SECTION 3
y
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
CABINET (UPPER) SUB ASSY , CABINET (LOWER) SUB ASSY
2
three screws (B2)
5
cabinet (upper) sub assy
3
three claws
1
open the upper lid sub assy.
3
five claws
4
flexible board
(CN801)
INSTALLATION MAIN BOARD
On installation MAIN board, adjust the S803,
804 and knobs (HOLD, AVLS).
S804
3
two claws
6
cabinet (lower) sub ass
2
two screw (B2)
CDM-3022EBA (EXCEPT US)
CDM-3022EBG (US)
S803
knob (HOLD)
– 5 –
knob (AVLS)
cabinet (lower) sub assy
Note: Follow the disassembly procedure in the numerical order given.
INSTALLATION UPPER LID SUB ASSY
1
flexible board
2
cabinet (upper) sub assy
upper lid sub assy
3
three bosses
2
switching arm assy
After sticking the switching arm assy into
the hole on the cabinet, connect them with screw.
To remove the switching arm assy, following
reverse procedure, remove screw, then
three bosses.
– 6 –
SECTION 4
oscilloscope
(AC range)
+
–
MAIN board
TP601 (RF)
TP (GND)
2 k
Ω
RF level
0.35 to 0.65 Vp-p
ELECTRICAL ADJUSTMENTS
The CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
Precautions for Check
1. Perform check in the order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Power supply voltage requirement: DC4.5 V in DC IN jack.
(J401)
VOLUME button: Minimum
AVLS switch : NORM
HOLD switch : OFF
Checking Location:
– MAIN board (Side A) –
Focus bias Check
Condition:
• Hold the set in horizontal state.
Connection:
Procedure:
1. Connect the oscilloscope to the test points TP601 (RF) and TP
(GND) on the MAIN board.
2. Set a disc. (YEDS-18)
3. Press the u button.
4. 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 Waveform (Eye Pattern)
VOLT/DIV : 100 mV (With the 10:1 probe in use)
TIME/DIV : 500 ns
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy watching.
5. Stop revolving of the disc motor by pressing the x button.
TP
(GND)
TP 601
(RF)
– 7 –
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