i havent try that yet. looks like i have to lift that.
on first repair i 100% pressed every component on board and amp was ok for a year.
dunno what really has happened
on first repair i 100% pressed every component on board and amp was ok for a year.
dunno what really has happened
I don't understand what you're trying to say. I'm trying to ask questions to understand what you're trying to say.
sorry, some terms are hard for my english.
but when removed broken channel fets i noticed other channel had 28volts, slightly touched lm339 by plastic stick dc went to normal 9mv, 28v came back if i didnt touch it. so i re soldered all 14 legs.
i did see on my current meter amp draw rise a little when it seemed to work on normal 9mv out
but when removed broken channel fets i noticed other channel had 28volts, slightly touched lm339 by plastic stick dc went to normal 9mv, 28v came back if i didnt touch it. so i re soldered all 14 legs.
i did see on my current meter amp draw rise a little when it seemed to work on normal 9mv out
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soldered pad4 monitoring wire to thermistor so i can easily measure whats going on, it hovers around 3volts now.
im gonna put those missing fets on board when i get them and keep on monitoring.
its same situation as after first repair gremlin got away when i did nothing
im gonna put those missing fets on board when i get them and keep on monitoring.
its same situation as after first repair gremlin got away when i did nothing
3v is too high. The voltage must be below the voltage on pin 5 which should be 2.5v.
What's the resistance across the thermistor (desoldered from the board but in thermal contact with the board).
Fill one of the screw holes with heatsink compound and push the thermistor into the screw hole. The heatsink should be at room temperature (~20C).
What's the resistance across the thermistor (desoldered from the board but in thermal contact with the board).
Fill one of the screw holes with heatsink compound and push the thermistor into the screw hole. The heatsink should be at room temperature (~20C).
With the thermistor out of the circuit but pin 4 connected to its solder pad, does the amp produce drive pulses from the TLx94 (if the FETs are out of the circuit)?
This is what I'd expect. Inconsistencies certainly do make things more difficult.
Do you have to replace any other parts than the 3205s?
Gate resistors? Driver transistors?
Do you have a scope?
Do you have to replace any other parts than the 3205s?
Gate resistors? Driver transistors?
Do you have a scope?
i could have access to scope.
on what order i should go forward?
power up amp without 3205, scope that 5.1v signal on board, if those are ok put 3205 on board.
then scope signals on 9540/540, if ok put those on board.
am i right?
on what order i should go forward?
power up amp without 3205, scope that 5.1v signal on board, if those are ok put 3205 on board.
then scope signals on 9540/540, if ok put those on board.
am i right?
Could have access? Do you have to travel to get to it?
Do you have any spare capacitors between 0.1uF and 0.01uF? A junk board to pull them from, if not spares?
Do you have any spare capacitors between 0.1uF and 0.01uF? A junk board to pull them from, if not spares?
my friend got one and he know how to use it.
i think i bought that capacitor on first spare part run
i think i bought that capacitor on first spare part run