HT-DDW980, STR-K980 - Sony Audio Service Manual (repair manual). Page 14

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1. While depressing the  TUNING MODE  and the  MUSIC

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

2. “VACS OFF” appears. (10 second)

1. While depressing the   SPEAKERS (ON/OFF)  and the  A.F.D.

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

2. “SWP.ALL” appears. (No change while displayed.)

DCAC Factory Test mode have two stages:

1. DCAC DSP Data Line Checking
2. DCAC AUTO CAL MIC board Checking

1. When power off :

Press the three buttons   TUNING +  +  MOVIE  +
?/1  . (Make sure volume is not MIN, example “VOL 1”)
“DCAC[]FTM” appears.
Afterward, press the  TUNING MODE   to start DCAC factory
test mode.

After press the  TUNING MODE  , DCAC Factory test mode will
start, below display will show:

“DCAC[][][]x”      x = 1, 2, 3, 4
If there is error happen, below display will show:

“ERR[]SD0x”

x = 1 

→ 

D1501 or R1530 or C1512 problem

x = 2 

→

 D1502 problem

x = 3 

→

 D1503 problem

x = 4 

→

 D1504 problem

Connect front left speaker of the receiver and AUTO CAL
microphone. Turn  MASTER VOLUME  jog, there will be test tone
sound output from front left speaker, and the display will change
accordingly.

“AD[]-[]xxx”

xxx = 0 to 255 (depends on loudness of test tone)

DSP Data Line

Check

Start

Pass

Pass

Auto Cal Mic

Check

END

SPK Front Left

DCAC MIC

Receiver