Sony ST-SE570 Service Manual ▷ View online
ST-SE570
5
2-3.
MAIN BOARD
4
MAIN board
2
connector (CNP701)
2
connector (CNP702)
2
connector (CNP952)
1
wire (flat type) (15 core)
(CN101)
(CN101)
3
two screws
(BV/RING)
(BV/RING)
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.
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.
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 .
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
7
ST-SE570
3. Entering the Factory Preset (In case perform just to write memory of the Factory Preset.)
1. Turn OFF the power.
2. While pressing 3 and AUTO-BETICAL SELECT together, turn ON POWER .
2. While pressing 3 and AUTO-BETICAL SELECT together, turn ON POWER .
4. Forced RESET (Used to delete the contents of Factory Preset when it is written into the preset memory.)
Clears all the RAMs and sets the initial state
1. Turn OFF the power.
2. While pressing 5 and AUTO-BETICAL SELECT together, turn ON POWER .
3. When “All clear” is indicated on the fluorescent display tube, it means that “Forced Reset” has been completed.
1. Turn OFF the power.
2. While pressing 5 and AUTO-BETICAL SELECT together, turn ON POWER .
3. When “All clear” is indicated on the fluorescent display tube, it means that “Forced Reset” has been completed.
5. Language Change
1. Turn OFF the power.
2. While pressing 2, turn ON POWER .
2. While pressing 2, turn ON POWER .
8
ST-SE570
SECTION 4
ELECTRICAL ADJUSTMENTS
FM Signal Level Adjustment
Procedure:
1. Tune the set to 98 MHz.
2. Push the DISPLAY button for digital signal meter indication.
3. Adjust RV201 to the place where level and “70dB
1. Tune the set to 98 MHz.
2. Push the DISPLAY button for digital signal meter indication.
3. Adjust RV201 to the place where level and “70dB
M” indica-
tion lights on fluorescent indicator tube.
Adjustment Location:
[MAIN BOARD] — Component Side —
FM RF signal
generator
generator
set
FM ANTENNA
75
75
Ω
coaxial
(TB101)
Carrier frequency : 98 MHz
Modulation
Modulation
: 1 kHz, 40 kHz deviation
Output level
: 6.3 mV (76dB
µ
)
(75
Ω
open)
IC201
CN101
RV201
FM SIGNAL LEVEL
Adjustment
Click on the first or last page to see other ST-SE570 service manuals if exist.