Sony ST-SE570, Service Manual

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6
ST-SE570
NOTE : The preset data will be erased when this test mode is used. Therefore, take down the data before setting this mode and preset the data
again after completing operations in this mode.
2. Display Tube Check and KEY Check mode
1. Turn OFF the power.
2. While pressing
1
and AUTO-BETICAL SELECT together, turn ON POWER .
3. While continuously pressing
1
and AUTO-BETICAL SELECT together, check the following.
Indication test pattern
The display changes every 1 sec.
4. Release 1 and AUTO-BETICAL SELECT . The KEY CHECK mode will be set.
5. All key numbers will be displayed.
Key Number : 25
6. Each time the key is pressed, the key number will be counted down.
Each key will be counted only once, at the first time.
7. When all keys have been pressed, the process will end.
NOTE : As contents of the Factory Preset will be written into memory after completing this check mode, delete contents of memory
according to 4. Forced RESET.
SECTION 3
TEST MODE
1. Circuit Check Mode
Set to the reception frequency that the circuit can STEREO RDS stations. (Set the input level to above 70 dB.)
This enables circuit check to be performed in any of the reception modes-FM, AM (MW, LW). Set to a desired band before setting the test
mode.
1. Turn OFF the power.
2. While pressing
4
and AUTO-BETICAL SELECT together, turn ON POWER .
• The items in the following table will be checked automatically in order every 2 seconds.
FM RDS
Display
Items
Tuned
IF Frq
Sig Level
Stereo
RDS Signal
AST signal =LOW
IF COUNT OK
SI LEVELh70dB
ST signal=LOW
RDS DATA OK
DISPLAY
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
AM (MW, LW)
OK or NG
OK or NG
NG
IC201 NG, RV201 adjustments
TB101, IC201 NG
TB101 NG
TB101 NG
IC801 NG
Microcomputer version indication (1 sec)
t
All light up “7F”
t
Dot area only “60”
t
Dot area only “7E”
Dot area only “5F”
T
Dot area only “3D”
T
T
1
7F
2
60
3
7E
4
3D
5
5F