STR-DG520 - Sony Audio Service Manual (repair manual). Page 13

DCAC FACTORY TEST MODE 
(Except US, Canadian model)
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 [MEMORY/ENTER] + [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

If there is error happen, below display will show:

“ERR

[]

SD0x” x=1 

t D1501 or R1530 problem

 x=2 

t D1503 problem

 x=3 

t D1504 problem

2. DCAC board Checking
Connect front left speaker of the receiver and AUTO CAL micro-
phone. 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)

Procedure:
1.  Turn on the set.
2.  Input the following signal from Signal Generator to FM 

antenna input directly.

* Carrier Frequency: A=87.5 MHz, B=98 MHz, C=108 MHz
Deviation 

: 75 kHz

Modulation  : 1 kHz
ANT input 

: 35 dBu (EMF)

Note:
Please use 75 ohm “coaxial cable” to connect SG and the set. You 
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.

3.  Set to FM tuner function and scan the input FM signal with 

automatic scanning.

4. Confi rm that input Frequency of A, B and C are detected and 

automatic scanning stops.

The stop of automatic scanning means “The station signal is re-
ceived in good condition.”