DPP-MS300 - Sony Other Service Manuals Service Manual (repair manual)

US Model

Canadian Model

– Continued on next page –

– 2 –

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

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After correcting the original service problem, perform the follow-
ing safety check before releasing the set to the customer:
Check the antenna terminals, metal trim, “metallized” knobs,
screws, and all other exposed metal parts for AC leakage.
Check leakage as described below.

The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microampers.).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers’ instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)

1.5 k

Ω

0.15 

µ

F

AC
voltmeter
(0.75 V)

To Exposed Metal
Parts on Set

Earth Ground

– 3 –

Identifying the parts ..................................................... 1-1
Setting Up .................................................................... 1-1
Printing ......................................................................... 1-4
Making Various Prints ................................................. 1-6
About “Memory Stick” ................................................ 1-10
About PC cards ............................................................ 1-10

...................................................... 2-1

.................... 3-1

...................... 4-1

Power Supply Block .................................................... 4-3
Video Block .................................................................. 4-4

5-1.

Block Diagram  – VIDEO Section – ........................... 5-1

5-2.

Block Diagram – MAIN Section – .............................. 5-3

5-3.

Block Diagram – CENTRONICS Section – ............... 5-5

5-4.

Block Diagram
– PC CARD/MEMORY STICK Section – .................. 5-7

5-5.

Block Diagram – HERD/SENSOR/
MOTOR/POWER SUPPLY Section – ........................ 5-9

5-6.

Frame Schematic Diagram .......................................... 5-11

5-7.

Notes for Printed Wiring Board and
Schematic Diagram ...................................................... 5-13

5-8.

Printed Wiring Board  – VS-40 Board – ..................... 5-15

5-9.

Schematic Diagram – VS-40 Board – ......................... 5-16

5-10. Printed Wiring Board – VI-40 Board – ....................... 5-17
5-11. Schematic Diagram – VI-40 Board – .......................... 5-19
5-12. Printed Wiring Board  – DK-40 Board – .................... 5-23
5-13. Schematic Diagram  – DK-40 Board (1/3) – .............. 5-25
5-14. Schematic Diagram  – DK-40 Board (2/3) – .............. 5-28
5-15. Schematic Diagram  – DK-40 Board (3/3) – .............. 5-31
5-16. Printed Wiring Board  – MP-40 Board – .................... 5-33
5-17. Schematic Diagram – MP-40 Board – ........................ 5-35
5-18. Printed Wiring Boards  – FE-40/JK-40 Boards – ....... 5-39
5-19. Schematic Diagram – FE-40/JK-40 Boards – ............. 5-41
5-20. Printed Wiring Board  – SW-40 Board – .................... 5-43
5-21. Schematic Diagram  – SW-40 Board – ....................... 5-45
5-22. Printed Wiring Boards

– HP-40/JD-40/MD-40/RD-40 Boards – .................... 5-47

5-23. Schematic Diagram

– HP-40/JD-40/MD-40/RD-40 Boards – .................... 5-49

5-24. IC Pin Function Description ........................................ 5-59

............................................. 6-1

............................ 7-1

1-1

This section is extracted from in-
struction manual (3-866-753-11).