Panasonic BT-S1315DA, Service Manual

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1.6 Repair Procedure of Horizontal Osc.
Disable Circuit
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1. Connect a DC voltmeter between the "+" side of C550 and a chassis ground. If the voltmeter
does not read nearly 20 V, check R569, D520, C550, R571 and R573.
2. Connect the "+" side of the DC voltmeter to the collector of Q803 and the "-" side to TPA4
(GND). The collector voltage of Q803 changes from nearly 11 V to 0.1 V when R571 is
shorted by 10 kΩ jumper. If this does not occur, checkQ518, C568, R581, Q515, C558, R574,
R575, Q514, C551, R570, D521, C554, C555, D524, R576, R582, R590, R577, C564, R591,
C562, Q517, D526, R579, D509, R571, R573, C550, D520, R569, R836, R835, C837, Q803,
D818, R834 and D823.
3. Carefully check the above specified parts and the related circuits and parts. When the circuit
has been repaired, make the horizontal osc. disable circuit test again.
Fig.2
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file:///E:/BT-S1315DA_BT-S1315DAD_BT-S1415DA_BT-S1415DAD/SVC/s0106000000.html [2006-02-04 08:28:13]