Read Sony SAVA-57 Service Manual online
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SECTION 4
TEST MODE
MODE ALL FLUORESCENT INDICATOR TUBES LIGHT
When the AC plug is inserted to the power outlet with pressing the
MASTER VOL + button, the all fluorescent indicator tubes light.
MASTER VOL + button, the all fluorescent indicator tubes light.
KEY CHECK, LED LIGHTING MODE
1. Pull out the AC plug from the power outlet and turn the power
OFF.
2. Connect the lead wire to TP3 on the KEY board.
3. Insert the AC plug to the power outlet and set to STANDBY
3. Insert the AC plug to the power outlet and set to STANDBY
mode.
4. Let the lead wire connected in step 1 contact to the ground.
5. All fluorescent indicator tubes light, and enter the key check
5. All fluorescent indicator tubes light, and enter the key check
mode.
6. Pressing any buttons, the number of button will be displayed on
the fluorescent indicator tube.
7. After all buttons are pressed, it will be in the STANDBY mode.
SECTION 5
ELECTRICAL ADJUSTMENT
CARRIER FREQUENCY Adjustment
Note:
Set the transmitter to the user's environment, connect it to the front
speaker, and supply the power. (Refer to Service Note.)
Set the transmitter to the user's environment, connect it to the front
speaker, and supply the power. (Refer to Service Note.)
Setting:
TP5
TP6
Transmitter
board
R226
board
R226
frequency counter
Procedure:
1. Connect the frequency counter to TP5 and TP6 of the two ends
1. Connect the frequency counter to TP5 and TP6 of the two ends
of the resistor (R226) of the TRANSMITTER board.
2. Turn ON the power of the front speaker.
3. Adjust L201 of the TRANSMITTER board, and adjust so that
3. Adjust L201 of the TRANSMITTER board, and adjust so that
the reading of the frequency counter is 4.3 MHz ± 0.01 MHz.
RECEIVING FREQUENCY, MUTING LEVEL adjustment
Note:
Perform procedure 1 if using FM RF SSG and procedure 2 if not.
However, as procedure 2 is a simple procedure, adjustment is not
accurate.
Perform procedure 1 if using FM RF SSG and procedure 2 if not.
However, as procedure 2 is a simple procedure, adjustment is not
accurate.
• Procedure 1
Setting:
TP7
TP8
Receiver
board
L1
board
L1
FM RF SSG
level meter
Receiver
board
TP102
board
TP102
Carrier frequency : 4.3MHz
Modulation
Modulation
: no moduration
Output level
: 40dB (at 75
Ω
open)
Procedure:
1. Connect SSG to TP7 and TP8 of the two ends of the coil (L1) of
1. Connect SSG to TP7 and TP8 of the two ends of the coil (L1) of
the RECEIVER board.
2. Set the output level of SSG to 40 dB.
3. Insert the AC plug of the unit to the power outlet and supply the
3. Insert the AC plug of the unit to the power outlet and supply the
power.
4. Adjust IFT103 of the RECEIVER board, and adjust so that the
voltage of both ends of TP102 becomes 0V. (RECEIVING FRE-
QUENCY adjustment)
QUENCY adjustment)
5. Adjust the output level of SSG to 22 dB.
6. Adjust RV102 until D109 turns green from red. (MUTING
6. Adjust RV102 until D109 turns green from red. (MUTING
LEVEL adjustment)
Button
Button Number
LED Color
POWER
MASTER VOL –
MASTER VOL +
INPUT
SURROUND
CTR MODE
S.WOOFER
2
3
4
5
6
7
8
Red
Green
Red
Green
Red
Green
Red
Note:
1. The LED (D505) lights while pressing each button.
1. The LED (D505) lights while pressing each button.
The LED lights in red when even number of buttons are pressed,
and it lights in green when odd number of buttons are pressed.
and it lights in green when odd number of buttons are pressed.
2. The LED lights even when the pressed button is pressed again.
• Parts Location
[KEY BOARD] — Conductor side —
CN552
R557
TP3
S506
IC503
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