Hitachi DV-W1U - Manual (Page 10)

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3-3. RECORDER AUDIO CIRCUIT
ARE THERE SIGNALS
AT PG1304 pins 1, 3?
No
Yes
BREAKDOWN CRD-RA1
CHECK Q3510, Q3511 AND Q3512
CHECK IC1512 AND IC1513
CHECK IC1507, IC1508,
D3301, D1302, Q3543, Q3544,
Q1310, Q1311, Q3505, Q3506,
Q1312, Q1313, ZD3501, ZD1303
CHECK C3515, C3516, C1503, C1504,
R3517, R3518, R1579, R1580
ARE IC1512 pins 6, 12
AND IC1513 pins 6, 12
0V?
ARE THERE SIGNALS
AT IC1507 pins 7, 8
AND IC1508 pins 7, 8?
No
Yes
No
Yes
No
Yes
ARE THERE SIGNALS
AT IC1507 pins 5, 10
AND IC1508 pins
5, 10?
NO SOUND