STR-DH550, STR-DH750 - Sony Audio Service Manual (repair manual). Page 11

HISTORY  MODE
The state that the set is used is memorized.
Procedure:
1.  While pressing [TUNING MODE] and [DISPLAY] buttons si-

multaneously, press the [

?/1

] button to turn on the power and 

“HISTORY” is displayed.

2.  Each time the [ 

M ] [ m ] key of remote commander is pressed,

 

the item is switched in order as follows.

  Protector Count

 C  O  U  N  T   

 

x 

x 

x

 

Total 

Power 

ON 

time  

T x x x x x H x x M

 

Main 

Power 

On

 

M 

x x x x x H x x M

 

Protector 

type

 

P R O T   x x x x 

  Sound Field

 S  N  D   

F  I 

E  L 

D 

 

Function

 

  F  U N C T  I  O N 

  Input Mode

 I 

N  P   

M  O  D  E   

 

Digital 

Select

 

D I  G   S E L  E C T

 Stream

 S  T  R  E  A  M  I 

N  F  O

 Channel Config

 

C 

O N F   x x x x x

 

Headphone

 

H E A  D P H   x  x  x

 

Volume

 

V O L _   x x    

 

Muting

 

M U T  I  N G _  x  x 

 

Bass

 

B 

A 

S 

S 

   x 

x 

x

 

Treble

 

T 

R 

E 

B 

   x 

x 

x

 

Front 

Level

 

F     x x x /  x x x

 

Center 

Level

 

C 

    x x x /  x x x

 

Surround 

Level

 

S     x x x /  x x x

  Surround Back Level
  (Only for STR-DH750)

 

B     x x x /  x x x

  Front Height Level
  (Only for STR-DH750)

 

H 

    x x x /  x x x

 

Temperature

 

T 

E 

M 

P 

_ 

    

 

Total 

Power 

On 

 

T x x x x x H x x M

 

Main 

Power 

On

 

M 

x x x x x H x x M

  Power On Count

 R  E  B  O  X  _ 

 

x 

x 

USB  UPDATE  TEST  MODE
To update micontroller software through USB.
Procedure:
1.  Plug in USB device in power off condition.
2.  While pressing [TUNING MODE] and [PURE DIRECT] 

buttons simultaneously, press the [?/1] button to turn on the 
main power.

3.  The message “UPDATING” appears.
4.  If the updating progress succeeds, the message “COMPLETE” 

appears.

5.  If the updating progress fails, the message “ERROR” appears.

USB  UPDATE  VERSION  MODE
Function that displays the version number of all firmware to 
check whether USB Update Test is necessary or not.
Procedure:
1.  While pressing [TUNING MODE] and [DIMMER] buttons, 

press the [?/1] button to turn on the main power.

2.  The message “VER X.XXX” is displayed. “X.XXX” is 

calculated by adding all fi rmware version.

 Example:
 

(MCU ver. + VIDEO ver. + DSP ver. + OSD ver. + 6)/10 =

 

USB Update version

 

MCU = 1.01, VIDEO = 1.04, DSP = 1.02, OSD = 1.03

 

↓

 

(1.01 + 1.04 + 1.02 + 1.03 + 6)/10 = 1.010

 

1.010 = X.XXX