Sony STR-K685, Service Manual

Page: 11 / 52

11
STR-K685
DCAC FACTORY TEST MODE
DCAC Factory Test mode have two stages:
1. DCAC DSP Data Line Checking
2. DCAC board Checking
Factory Test System Setup
1. When power off :
Press the three buttons MUSIC + DISPLAY + ?/1 .
“DCAC
[]
FTM” appears.
Afterward, press the DIMMER to start DCAC factory test
mode.
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:
“ERR
[]
SD0x” x = 1
→
D1501 or R1530
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)
DSP Data Line
Check
Start Pass Pass
Auto Cal Mic
Check
END
SPK Front Left
DCAC MIC
Receiver