I have two Pioneer car amplifiers Pioneer GM-62 & Pioneer GM 3400 , both with same problem : working only with some batteries / power supplies , by example on my working bench where I have a combined (power supply + 12 V car battery as buffer) supply unit with long enough cable extensions till my connection (so, some drop of power - unstabilised) , ARE WORKING !!! , when connected direct to a battery or short-connected (short cables) direct to a computer 12V power supply or laptop power supply or any other 12V / 14 V / 16V power supply - ARE NOT WORKING. On Pioneer GM-62 've found TA 8194Z-muting circuit and I will work on it but on Pioneer GM 3400 I did not see the muting / stby circuit. Any help ?
Yes , shielded RCA, of course.The idea is that these Pioneer amplifiers are battery-voltage (or ampers)-sensitive, triggered by some fluctuation of voltage / ampers. Somehow need a "drop of voltage" to mute off. Direct to a battery there is no drop of voltage.
Brilliant answer ! That was the problem ! I've spent almost 4 hours understanding what happened, why working on my bench (on my bench all are common-grounded) but not on any car battery. Pioneer car amplifiers need at least a strap - if not a correct line-up - between input ground and power ground.
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