Sony STR-K900 - Fm Stereo/fm-am Receiver Service Manual page 13

VACS CONTROL
Procedure:
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)
SWAP ALL MODE
Procedure:
1. While depressing the SPEAKERS (OFF/A/B/A+B) 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
DCAC Factory Test mode have two stages:
1. DCAC DSP Data Line Checking
2. DCAC AUTO CAL MIC board Checking
Start Pass
DSP Data Line
Check
Factory Test System Setup
Receiver
DCAC MIC
SPK Front Left
1. When power off :
Press the three buttons TUNING + + MOVIE +
?/1 .
"DCAC[]FTM" appears.
Afterward, press the TUNING MODE to start DCAC factory
test mode.
1. DCAC DSP Data Line Checking
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
2. DCAC AUTO CAL MIC board Checking
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)
Pass
Auto Cal Mic
END
Check
STR-K880/K900
13