STR-DH520 - Sony Audio Service Manual (repair manual). Page 9

AM CHANNEL STEP 9 kHz/10 kHz SELECTION MODE
(US, Canadian model only)
* Either the 9 kHz step or 10 kHz step can be selected for the AM 

channel step.

* Procedure:

Turn the [INPUT SELECTOR] control to set AM and press the 
[

?/1

] button to turn off the main power.

1.  While depressing the [TUNING MODE] button, press the 

[

?/1

] button to turn on the main power.

2.  Either the message “9K STEP” or “10K STEP” appears for a 

moment and select the desired step.

 
VACUUM FLUORESCENT DISPLAY TEST MODE
* All fluorescent 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 depressing the [TUNING +] and the [DIMMER] buttons 
simultaneously, press the [

?/1

] button to turn on the main power.

1.  ALL segments light on.

 

2.  Press the [DISPLAY] button, confirm display.

 

3.  Press the [DISPLAY] button, confirm display.

 

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

SOUND FIELD CLEAR MODE
* The preset sound field is cleared when this mode is activated.

Use this mode before returning the product to clients upon com-
pletion of repair.

* Procedure:
1.  While depressing the [MUSIC] button, press the [

?/1

] button 

to turn on the main power.

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

ization is performed.

SOFTWARE VERSION CHECK MODE
* The software version is displayed.
* Procedure:
1.  While depressing the [TUNING MODE] and the [DISPLAY] 

buttons simultaneously, press the [

?/1

] button to turn on the 

main power.

2.  The message “H5**MX.XX” appears.

**: Destination

3.  Each time the [DISPLAY] button is pressed, “H.VER X.XX” 

and “S.VER X.XX” appear in this order and return to the 
“H5**MX.XX” display.

KEY CHECK MODE
* Button check
* Procedure:
1.  While depressing the [TUNING +] and the [MUTING] but-

tons simultaneously, press the [

?/1

] button to turn on the main 

power.

2.  The message “REST 12” appears.
3.  Every pressing of any button other than the [

?/1

] counts down 

the buttons. The buttons which are already counted once are 
not counted again. When all buttons are pressed “REST 00” 
appears.

SWAP ALL MODE
* The signal will be swap to all channel so that all speaker will

 have sound output.

* Procedure:
1.  While depressing the [TUNING MODE] and the [MOVIE/

HD-D.C.S.] buttons simultaneously, press the power [

?/1

] 

button to turn on the main power.

2.  “SWAP.MODE” appears. (No change while displayed.)

PROTECTOR AUTO OFF
* To disable auto off after protector occur.
* Procedure:

1.  While depressing the [INPUT MODE] and the [A.F.D.] but-

tons simultaneously, press the power [

?/1

] button to turn on 

the main power.

2.  “PROT OFF” appears.

DCAC TEST MODE
Procedure:
1.  While pressing [INPUT MODE] and the [MOVIE/HD-D.C.S.] 

buttons, press the [

?/1

] button to turn on the main power.

2.  The message “SOURCE” or “MIC” appears.
 

Repeat step 1 to toggle between “SOURCE” and “MIC”.

 

SOURCE: normal mode

 

MIC: mode that output audio from mic input.

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 the [TUNING MODE] and [DIMMER] but-

tons, 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 the [TUNING MODE] and [MUTING] but-

tons, 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.