Sony RDR-GX257 Servise Manual page 52

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3 7 63 1515 0
8. NO TV, EXTERNAL INPUT VIDEO SIGNAL
< REAR AV INPUT >
SCART MODEL
AV2 RGB or Y/C input is N.G
Check SCART Jack
YES
Check SAA7138 R/GB :
pin8,14,27,35 Y/C : pin8,14
TE
L 13942296513
SAA7138
VI_CLK, D0~D7
Is there a singal?
YES
Replace FFC cabel
or FFC connector
YES
Check MPEG IC
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IF CVBS INPUT is N.G,
SCART Model : EU1/2_V_IN
RCA Model : EU1_V_IN
Check REAR Jack
SAA7138 pin29(SW_A_L/R)
YES
SAA7138 pin16 :
Is there a signal?
YES
NO
NO
Check Reset, I2C
Replace SAA7138
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2 9
8
YES
MM1763 pin42
NO
are O.K?
< FRONT AV INPUT >
NO
Q Q
3 6 7 1 3
SAA7138
NO
3.3V, 1.8V are
alive?
YES
NO
SAA7138
X-TAL is O.K?
YES
from MPEG IC
YES
.
6-8
RDR-GX257/GX380
9 4 2 8
< TUNER INPUT >
MM1763 pin7
Is there a signal?
NO
CHECK TUNER I
(CLK & DATA) 5.3VA , 5V_IO
Check MM1763 I2C(CLK &
DATA) SW_5.3VA, SW12VA
Check FFC connection
FRONT - IO B/D
1 5 0 5 8 2 9 9 4
Check 3.3V, 1.8V line
Check X-TAL(24.576MHz)
m
co
9 9
C
2
2 8 9 9