CADILLAC DIV,-GENERAL MOTORS 072-A SCH
(PDF)265.4 KB
5
AUDIO
SERVICE MANUAL
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- Also known:
CADILLAC DIV GENERAL MOTORS 072A 072 072-A
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Original problem is no sub woofer output. Been through this one and recapped it and the common 2 burned 1K (R16/17)
resistors are replaced but the sub is still not responding. Volume control potentiometer is a common issue on these but
the L-R spkrs sound good.
Went by this webpage on the repair:
https://christopherbradshaw.net/The_Project_Bin/klipsch%20promedia%20subwoofer%20repair%20-%20page%201.html
On the schematic there is a sub-relay (sw101) powered by +V_HF line it
maybe is suppose to be +V_LF ? Without the relay coming on looks like the sub is disconnected.
The zeners (D03/04) that give +/- Vcc to the op amps seemed way off so I replaced them and the voltages seem much closer.
Theres also a sub-mute line on p104 to p101. Power supply shows the LF mute relay and interconnect diagram says it
gets fed from the LF amp. What is triggering the mute? I dont see a mute button anyplace.
Sziasztok!
A címben említett keverő erősítő végfok paneljén egy zárlat miatt elég sok minden elszállt, többek között a 05Q04 nevű dióda is. Ki lehetne váltani egy 1N4148-al? Csatolok egy részletet a rajzból.
Üdv.: Viktor
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