Sony XM-7557 Primary, Руководство по обслуживанию

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3
SECTION 1
SERVICE NOTE
Clearing the Protector During Repairs
• OVER CURRENT : Detects overcurrent during output.
• OFF SET : Detects DC offset at the speaker terminal.
1. Clearing the OVER CURRENT protector
• When the position of the MODE switch (S801/power board)
is set to HI-CURRENT :
Cut the jumper wire JW230 of the amplifier board.
2. Clearing the OFF SET protector
• Cut the jumper wire JW307 of the amplifier board.
3. TEST TONE Function
1
Press the TEST TONE button (S710/SUB2 board) with the
power ON. The amplifier is normal if sound is produced from
the speaker.
2
If no sound
: Problem causer by incorrect connecttion of the power supply
system or sperker system.
: The signals input by the RCA cable before the amplifier system
are abnormal.
Adjustment Location
TEST
TONE
S710
- SUB 2 BOARD - (Component side) - AMPLIFIER BOARD - (Component side)
S801
MODE
JW230
JW307
VR502
TP3 TP4 TP5
TP6
TP7
TP1
TP2
VR501
VR401
VR301
VR201
VR101
- POWER BOARD - (Component side)