STR-DH720, STR-DH720HP - Sony Audio Service Manual (repair manual). Page 9

AM CHANNEL STEP 9 kHz/10 kHz SELECTION MODE
(US and Canadian 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] buttons 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 “9k STEP” or “10k STEP”.
6.  After a few second, “AM 531

kHz

” or “AM 530

kHz

” appears, 

select the desire step.

VACUUM FLUORESCENT DISPLAY TEST MODE
* All fl uorescent 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] but-

tons simultaneously, press the [

?

/

1

] button to turn on the main 

power.

1.  ALL segments light on.

 

dB    RDS

2.  Press the [DISPLAY] control, confi rm display.

 

dB    

3.  Press the [DISPLAY] control, confi rm display.

 

4.  Press the [DISPLAY] control, 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 

completion 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 initiali-

zation is performed.

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

tons, press the [

?

/

1

] button to turn on the main power.

2.  The message “H7 ** MX.XX” appears. 

**: Destination 
X.XX: Software version

 

Each time the [DISPLAY] button is pressed, “H.VER X.XX”,
“S.VER X.XX” and “F.VER X.XX” appear in this order, and 
returns to the “H7 ** 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.  Either the message “REST 14” appears.
 

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] 

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 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.

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 [

?

/

1

] button to turn on the main 

power.

2.  “PROT OFF” appears and switch on the set.