Sony RDR-GX257 Servise Manual page 48

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4. NO TUNER AUDIO OUTPUT
No TUNER audio output
YES
TUNER SIF
Is there a signal?
YES
SAA7138
pin106,107 normal
audio out?
YES
MM1763
pin40,41(SW_A_L/R)
are O.K?
TE YES
L 13942296513
SAA7138
pin 98~100 ADC
I2S is O.K ?
YES
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.
http://www.xiaoyu163.com
NO
I2C(CLK & DATA) 5.3VA, 5V_IO
NO
NO
Check MM1763 I2C(CLK &
DATA) SW_5.3VA, SW12VA
NO
FFC connection
Go to "When playing DISC,
No audio output"
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y
i
2 9
8
Check Tuner
SAA7138
NO
3.3V, 1.8V
are alive?
YES
NO
SAA7138
X-TAL is O.K?
YES
Q Q
3 6 7 1 3
ADC_MCLK YES
from MPEG
is O.K?
NO
Check
NO
MAIN - IO B/D
YES
.
6-4
RDR-GX257/GX380
9 4 2 8
Check power
Check X-TAL
1 5 0 5 8 2 9 9 4
Check reset,
I2C from MPEG IC
Replace FFC cabel
or FFC connector
m
co
9 9
2 8 9 9