STR-MD777 - Sony Audio Service Manual (repair manual)

MICROFILM

E Model

STR-MD777 is the Tuner
and Amplifier section in
DHC-MD777.

– 2 –

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2

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3

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5

4-1. IC Pin Function Description ...........................................

7

4-2. Block Diagram  – Main Section – .................................. 11
4-3. Block Diagram

– DISPLAY/POWER SUPPLY Section – ...................... 13

4-4. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 15

4-5. Printed Wiring Board  – MAIN Board – ........................ 17
4-6. Schematic Diagram – MAIN Board (1/2) – ................... 19
4-7. Schematic Diagram – MAIN Board (2/2) – ................... 21
4-8. Schematic Diagram – POWER Board (1/2) – ................ 23
4-9. Schematic Diagram – POWER Board (2/2) – ................ 25
4-10. Printed Wiring Board  – POWER Board – ..................... 27
4-11. Printed Wiring Board  – SP Board – .............................. 29
4-12. Schematic Diagram  – SP Board – ................................. 30
4-13. Printed Wiring Board  – GEQ Board – ........................... 31
4-14. Schematic Diagram  – GEQ Board – ............................. 33
4-15. Printed Wiring Board  – STR FL Board – ...................... 35
4-16. Schematic Diagram  – STR FL Board – ......................... 37
4-17. Printed Wiring Board  – SW Board – ............................. 39
4-18. Schematic Diagram  – SW Board – ................................ 41
4-19. Printed Wiring Boards

– FUNCTION/CD KEY Boards – .................................. 43

4-20. Schematic Diagram

– FUNCTION/CD KEY Boards – .................................. 45

4-21. Printed Wiring Boards

– MD KEY/REC MODE KEY Boards – ....................... 47

4-22. Schematic Diagram

– MD KEY/REC MODE KEY Boards – ....................... 49

4-23. Printed Wiring Board  – EDIT FL Board – .................... 51
4-24. Schematic Diagram  – EDIT FL Board – ....................... 53
4-25. Printed Wiring Boards

– SUB POWER/TA PRIMARY/TA SECONDARY
Boards – ........................................................................... 55

4-26. Schematic Diagram

– SUB POWER/TA PRIMARY/TA SECONDARY
Boards – ........................................................................... 57

................................................ 61

............................... 64

• The system microprocessor can be reset in the following proce-

dure.

Procedure:
1. Press three buttons 

[AUTO]

, 

[DISPLAY]

 (tuner section) and

[DISPLAY]

 (amplifier section) simultaneously.

2. When HMC-MD777 (CD player/MD deck section) received

reset command, “SRAM COLD SET” is display a few sec-
onds on fluorescent indicator tube.

3. Press the 

[I/   ]

 button to turn the POWER OFF.

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

aged by heat.

!

!

u

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1 CLOCK/TIMER SET button
2 TIMER indicator
3 TIMER SELECT, MANUAL, AUTO, PRESET,

TUNER/BAND, 

N/n, NAME EDIT, MENU/NO,

ENTER/YES buttons

4 Fluorescent indicator tube and DISPLAY button
5 CLEAR button
6 +/– knob
7 MASTER VOLUME knob
8 PRESET EQ button
9 DBFB button
0 GROOVE button
!¡ SELECTOR knob
!™ ENTER button
!£ CLEAR button
!¢ START button
!∞ MD1 to MD5 buttons
!§ REC IT button
!¶ HIT PARADE button and indicator
!• I/

u

 (POWER) button

!ª Remote sensor
@º DVD/VIDEO, OPTICAL IN, TAPE, MD, CD, TUNER ,

MD WALKMAN

@¡ CD1 to CD5 buttons
@™ Fluorescent indicator tube and DISPLAY button
@£ SELECT SYNC button and indicator
@¢ SEAMLESS button and indicator

1

2

3

4

5

6

7

8

9

!º
!¡

!™

!£

!¢

!∞

!§

!¶

@¢

@£

@™

@¡

@º

!ª

!•

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This section is extracted from
instruction manual.