Sony d 178 rm service manual

Page 1

D- 178RM/E306RM

SERVICE MANUAL

E Model

Photo : D-E306RM

Model Name Using Similar Mechanism NEW

CD Mechanism Type COM-241 1 AAA

Optical Pick-up Type BAX-11A

SPECIFICATIONS

System
Laser diode properties

Compact disc digital audio system
Material: GaAlAs
Wavelength: A = 780 nm
Emission duration: Continuous
Laser output: Less than 446 pW (measured at
200 mm away from the objective lens surface)
Sony Super Strategy Cross Interleave Reed
Solomon Code
D-A conversion l-bit quartz time-axis control
Frequency response 20 - 20,000 Hzi'de (measured by EIAJ CP»307)
Output (at 4.5 V input level)
Headphones (stereo minijack)
IS mW +15 mW at 16 ohms
Line output (stereo minijack)
Output level 0.7 V rms at 50 kilohms
Recommended load impedance over It)
kilohms

Error correction

General

Power requirements - Sony BP-DMIO Rechargeable ballet
2.4 V DC, Ni-Cd. 650 mAh
Sony BP-DMZO Rechargeable battery:
2.4 V DC, Ni»MH. 1,200 mAh

- Two LR6 (size AA) batteries: 3 V DC

. AC power adaptor (DC IN 45 V jack):
(EXCEPT Korea model)
Central & South America model : IZI) V. 60 Hz
E13 (AC220 - 230V area), Chinese model :
220 A 230 V, 50/60 Hz
Saudi Arabia model : Ill) - 240 V. 50/60 HZ
E33IAC100 A 240V area) model :
100 - 240 V. 50/60 Hz

- Sony CPM-300P mount plate for use on car
battery: 4.5 V DC

Dimensions (w/h/d) ththout projecting pans and controls)
Approx, I35 x 29.9 x 159.5 mm
(5 V» x 1 lm x 6 /a in.)
Mass (Without rechargeable battery)
Approx. 250g (8.8 oz)
Operating temperature 5°C - 35°C I4|°Fr 95°F)
Supplied accessories
D-I78RM
AC power adaptor I I)
Stereo headphones with remote commander
(IV
Stereo headphones II )**
Rechargeable battery I l )*
Connecting cord (Phono plug it 2 H stereo
miniplug) I 1)
Wireless remote commander I I)
*Not supplied with Central & South America
model
MSupplied with Central & South America
model only
DvESWRM
AC power adaptor ( 1)
Stereo headphones with remote commander ( l )
Rechargeable battery I | )
Connecting cord (Phono plug x 2 H stereo
miniplug) II)
Wireless remote commander I | )

Design and specifications are subject to change without notice.

COMPACT DISC COMPACT PLAYER

SONY;

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TABLE OF CONTENTS

Specification ........................................................................... I
1 . SERVICING NOTES ....................................................... 2

2. GENERAL. .. 4

3. DISASSEMBLV
3- l. Lid Assy. Upper Removal ......................
3-2. Cabinet (Front) Assy. MD Assy Removal .
3-3. Main Board Removal .............................

4. SERVICE MODE ........................................................... 7
5. ELECTRICAL ADJUSTMENTS ................................... 8

6. EXPLANATION OF IC TERMINALS

7. DIAGRAMS
7»|. Block Diagram ...........
7»2. Printed Wiring Boards
7-3. Schematic Diagram....

8. EXPLODED VIEWS
8-]. Cabinet Section ......................................................... 27
8-2. Optical Pick-up Section ............................................ 28

9. ELECTRICAL PARTS LIST . 29

DANGER
lnvtsihle laser radiation when open and interlock failed or defeated.
Avoid direct exposure to beam.

CAUTION

Use otcontrols or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation ex~
posure.

This Compact Disc player is
cuss 1 LASER PRODUCT classified as a CLASS 1 LASER
LUOKAN 1 LASERLAITE PTOdUCL

KLASSI LASERAPPAFIAT The CLASS I LASER
PRODUCT label is located on
the bottom exterior.

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 dam-
aged by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK AOR DOTI'ED LINE WITH
MARK AON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICALTO 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.

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, ob-
serve from more than 30cm away from the objective lens.

Before Replacing the Optical pick-up Block

Please be sure to check thoroughly the parameters as par the Opti-
cal pick»up Block Checking Procedure" (Part No. : 9-960-027-1 I)
issued separately before replacing the optical Pick-up block.

Note and specifications required to check are given below.

0 FOK output: ICSOI @ pin
When checking FOK. remove the lead wire to disc motor.

- S curve P-to-P value : l.2i0.3Vp-p ICSOI ('3 pin. (Connect pin
® ol' ICSOI (TPSSO) and (CD of ICSOl (GND) with a jumper
wire).

When checking S curve P»to»P value, remove the lead wire to
disc motor.

Adjusted part for focus gain adjustment : RV503
- RF signal P-to-P value : 0.8 - |.2Vp-p
Traverse signal P-to-P value : LO - 2.4Vp-p

o

The repairing grating holder is impossible.
Adjusted part for tracking gain adjustment : RVSOZ