Sony STR-K685 Service Manual page 11

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DCAC FACTORY TEST MODE
DCAC Factory Test mode have two stages:
1. DCAC DSP Data Line Checking
2. DCAC board Checking
Start
DSP Data Line
Check
Factory Test System Setup
SPK Front Left
1. When power off :
Press the three buttons MUSIC + DISPLAY + ?/1 .
"DCAC[]FTM" appears.
Afterward, press the DIMMER to start DCAC factory test
mode.
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1. DCAC DSP Data Line Checking
After press the DIMMER , DCAC Factory test mode will start,
below display will show:
"DCAC[][][]x" x = 1, 2, 3
If there is error happen, below display will show:
x = 1 → D1501 or R1530
"ERR[]SD0x"
x = 2 → D1502 problem
x = 3 → D1503 problem
2. DCAC 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)
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Pass Pass
Auto Cal Mic
Check
Receiver
DCAC MIC
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