Fm Tuner Check - Sony STR-DG520 Service Manual

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
Start Pass
DSP Data Line
Check
Factory Test System Setup
Receiver
DCAC MIC
SPK Front Left
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:
x=1 t D1501 or R1530 problem
[]
"ERR SD0x"
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)
Pass
Auto Cal Mic
END
Check
SECTION 4

FM TUNER CHECK

FM AUTO STOP CHECK
set
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."
STR-DG520
Ver. 1.1
generator
OUT (75 Ω)
13