Sony RDR-GX257 Servise Manual page 49

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5. NO EXTERNAL AUDIO INPUT
< REAR AV INPUT >
Check JACK & L/R/C
SCART Model : EU1/2_A_IN_L/R
RCA Model : EU1_A_IN_L/R
YES
MM1763 pin40,41
SAA7138 pin120,121
(SW_A_L/R) are
O.K?
YES
SAA7138
3.3V, 1.8V
are alive?
YES
SAA7138
X-TAL is O.K?
TE
L 13942296513
YES
SAA7138
pin98~100 ADC I2S
is O.K?
YES
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Check FFC connection
FRONT - IO B/D
NO
Check MM1763 I2C(CLK &
DATA) SW_5.3VA, SW12VA
NO
Check 3.3V, 1.8V line
NO
Check X-TAL(24.576MHz)
NO
ADC_MCLK from
Go to "When playing DISC,
No audio output"
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i
2 9
8
Q Q
3 6 7 1 3
YES
MPEG is O.K?
NO
Check FFC
NO
connection
MAIN - IO B/D
YES
.
6-5
RDR-GX257/GX380
9 4 2 8
< FRONT AV INPUT >
NO
SAA7138 pin122,123 :
Is there a signal?
YES
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