The last month or so I've been working on an onkyo I basically got for free on the forum.
Initially just about every transistor in the final stage of one channel was blown among some other components. Also it was stuck in protection mode.
I've replaced all components at quite an expense since some of these are getting really rare and hard to get.
Feeling confidant in my repair, I switched it on, and blew up the same channel again. Less damage this time.
Final transistors popped, and the emitter resistor, and a small thermal transistor attached to the heatsink. Again got stuck in protection mode.
So I replaced those... again.
I then started it up with a 60 watt globe inline with live. I can hear the relay click on, and about a second later, it clicks off. No protection mode. just restarting in a loop.
I figured, okey... the resistance of the 60 watt globe is too high, so I'm limiting too much current for the startup logic or standby circuit.
Changed it to 100W globe. Lower resistance, and less current limiting.
Still getting the same. Screen comes on, displays the volume, then click, it goes of, and a second later, it comes on again. etc.
I'm not going to spend more on this amp. I'm just keen on hearing about other's experience using a globe with digital circuits.
Do I still have a short on the output, or is it normal for current limiter to mess with standby circuits?
Should I bypass the lamp and just plug in direct, risking frying the circuit again?
Initially just about every transistor in the final stage of one channel was blown among some other components. Also it was stuck in protection mode.
I've replaced all components at quite an expense since some of these are getting really rare and hard to get.
Feeling confidant in my repair, I switched it on, and blew up the same channel again. Less damage this time.
Final transistors popped, and the emitter resistor, and a small thermal transistor attached to the heatsink. Again got stuck in protection mode.
So I replaced those... again.
I then started it up with a 60 watt globe inline with live. I can hear the relay click on, and about a second later, it clicks off. No protection mode. just restarting in a loop.
I figured, okey... the resistance of the 60 watt globe is too high, so I'm limiting too much current for the startup logic or standby circuit.
Changed it to 100W globe. Lower resistance, and less current limiting.
Still getting the same. Screen comes on, displays the volume, then click, it goes of, and a second later, it comes on again. etc.
I'm not going to spend more on this amp. I'm just keen on hearing about other's experience using a globe with digital circuits.
Do I still have a short on the output, or is it normal for current limiter to mess with standby circuits?
Should I bypass the lamp and just plug in direct, risking frying the circuit again?
