DOWNLOAD Sony STR-DH550 / STR-DH750 Service Manual ↓ Size: 5.92 MB | Pages: 80 in PDF or view online for FREE

8 three screws
 (+BVTP 

u 8)

8 six screws
 (+BVTP 

u 8)

8 one screw
 (+BVTP 

u 8)

1 CNP902 (4P)

3 CN941 (4P)

4 CN1901 (12P)

5 CN3513
 (3P)

2  Wire is removed
 

6 wire (flat type)
 

7 wire (flat type)
 

9 five screws
 (+BVTP 

u 8)

0  back panel section

2 CN951 (5P)

3 CN950 (5P)

6 two screws
 (+BVTP 

u 8)

7 INSULATION board

8 two screws
 (+BVTP 

u 8)

9 two screws
 (+BVTP 

u 8)

6 two screws
 (+BVTP 

u 8)

1 Wire is removed
 

1 Wire is removed
 

8 MAIN board
 section

qa MAIN board
 section

B

B

C

B

C

C

4 one screw
 (+BVTP 

u 8)

5 USB INSULATION
 

4 one screw
 (+BVTP 

u 8)

5 USB INSULATION
 

D

E

D

E

7 two screws
 (+BVTP 

u 8)

0 one screw
 (+BVTP 

u 8)

3  heat sink section

3  heat sink section

4 MAIN board

2 one screw
 (+BVTP 

u 8)

2 one screw
 (+BVTP 

u 8)

2 one screw
 (+BVTP 

u 8)

1  Remove the thirty solders.
 

F

F

F

TUNER  AM  STEP  CHANGE  MODE
(US and Canadian models only)
Either the 9 kHz step or 10 kHz step can be selected for the AM 
channel step.
Procedure:
1.  Press the [

?/1

] button to turn on the main power.

2.  Turn the [INPUT SELECTOR] knob to select the “AM TUNER”.
3.  Press the [?/1] button to turn off the main power.
4.  While pressing the [TUNING MODE] button, press the [?/1] 

button to turn on the main power.

5.  Either the message “10K Step” or “9K Step” appears.
6.  Repeat step (4) to select desired step.

VACUUM  FLOURESCENT  DISPLAY  TEST  MODE
All fl ourescent segments are tested.
When this test is activated, all segments light on at the same time, 
then each segment lights on one after another.
Procedure:
While pressing [SPEAKERS] and [DIMMER] buttons simultane-
ously, press the [

?

/

1

] button to turn on the main power.

1.  ALL segments light on.

2.  Press the [DISPLAY] button to confi rm display as below.

3.  Press the [DISPLAY] button to confi rm display as below.

4.  Press the [DISPLAY] button, all segments light off.

SOUND  FIELD  CLEAR  MODE
The preset sound fi eld is cleared when this mode is activated.
Use this mode before returning the product to clients upon com-
pletion of repair.
Procedure:
1.  While pressing [MUSIC] button, press the [

?/1

] button to 

turn on the main power.

2.  The message “S.F. CLEAR” appears for a moment and 

initialization is performed.

SOFTWARE  VERSION  DISPLAY  MODE
The software version is displayed.
Procedure:
1.  While pressing [A.F.D./2CH] and [PURE DIRECT] buttons 

simultaneously, press the [

?

/

1

] button to turn on the main 

power.

2.  The message “H55 XXX” or “H75 XXX” appears.
 XXX: 

Area 

display

 

Each time the [DISPLAY] button is pressed, “SYS. vX.XX”,

 

“MAIN  vX.XX”, “VIDEO vX.XX”, “OSD vX.XX” and 
“SFLASHvX.XX” appear in this order, and returns to the 
“H55 XXX” or “H75 XXX” display.

 

X.XX: Software version

KEY  CHECK  MODE
Each button can be checked.
Procedure:
1.  While pressing [SPEAKERS] and [PURE DIRECT] buttons 

simultaneously, press the [

?/1

] button to turn on the main 

power.

2.  The message “REST 12” appears.
 

Every pressing of any button other than the [

?/1

] counts 

down the buttons.

3.  The buttons which are already counted once are not counted 

again.

4.  When all buttons are pressed, “REST 00” appears.

SWAP  ALL  MODE
The signal will be swap to all channels so that all speakers will 
have sound output.
Procedure:
1.  While pressing [PURE DIRECT] and [MOVIE] buttons 

simultaneously, press the [

?

/

1

] button to turn on the main 

power.

2.  “SWAP MODE” appears.

INITIALIZE  MODE
All preset contents are cleared when this mode is activated. Use 
this mode before returning the product to clients upon completion 
of repair.

(a) SHIPMENT MODE
Procedure:
1.  While pressing [A.F.D./2CH] and [DIMMER] buttons 

simultaneously, press the [

?

/

1

] button to turn on the main 

power.

2.  The message “CLEARING” appears and the memories are 

reset to the default values.

3.  When done, the message “CLEARED *” appears, the set will 

power off.

(b)  ALL CLEAR INITIALIZE
Procedure:
1.  While pressing [A.F.D./2CH] and [DISPLAY] buttons, press 

the [

?

/

1

] button to turn on the main power.

2.  The message “CLEARING” appears and the memories are 

reset to the default values.

3.  When done, the message “CLEARED *” appears, the set will 

power on.

(c) USER INITIALIZE
Procedure:
1.  Hold the [

?

/

1

] button for 5 seconds.

2.  The message “CLEARING” appears on the display.
3.  After few seconds, “CLEARED *” appears.

PROTECTOR  AUTO  OFF
To disable auto off after protector occur.
Procedure:
1.  While pressing [DISPLAY] and [MOVIE] buttons simultane-

ously, press the [

?

/

1

] button to turn on the main power.

2.  “PROTEVER” appears and switch on the set.

DCAC  TEST  MODE
To test audio output from mic input and speakers.
Procedure:
1.  While pressing [MUSIC] and [DIMMER] buttons simultane-

ously, press the [

?

/

1

] button to turn on the main power.

2.  The message “MIC” appears.
 

MIC: mode that output audio from mic input