Hello, I have an Alpine 3566 that was purchased from a Japan site. The seller claimed the amp was working, however there was no audio output.
I completely replaced all electrolytic caps in the amp. The amp now powers up but goes into protection mode for about four minutes, then the protection led goes green and the amp provides audio. The four 2SC4024 transistors in the "cancel" circuit of the inverter get quite warm after a few minutes , I then pull power away to eliminate any further damage. I probed the uPC4094C chip . Pin 5 has a sawtooth pattern, both pins 9 and 10 have the square wave but the wave looks distorted to me. pins 13 and 14 have 5 volts. I have since taken out the rectifiers to disconnect the power supply from the output section. The protection led immediately goes green and the power section stays on. The four 2SC4024 transistors only get warm now but the square wave still concerns me. Any ideas on what to check? Thank you.
I completely replaced all electrolytic caps in the amp. The amp now powers up but goes into protection mode for about four minutes, then the protection led goes green and the amp provides audio. The four 2SC4024 transistors in the "cancel" circuit of the inverter get quite warm after a few minutes , I then pull power away to eliminate any further damage. I probed the uPC4094C chip . Pin 5 has a sawtooth pattern, both pins 9 and 10 have the square wave but the wave looks distorted to me. pins 13 and 14 have 5 volts. I have since taken out the rectifiers to disconnect the power supply from the output section. The protection led immediately goes green and the power section stays on. The four 2SC4024 transistors only get warm now but the square wave still concerns me. Any ideas on what to check? Thank you.
What does the square wave look like on the gate legs of the PS FETs?
Align the trace to the reference line on the scope before posting any more waveforms.
Was the audio delayed in the vehicle?
What are you using for a 12v power supply?
How low is the voltage across the amp B+ and ground terminals before the amp released the muting?
Align the trace to the reference line on the scope before posting any more waveforms.
Was the audio delayed in the vehicle?
What are you using for a 12v power supply?
How low is the voltage across the amp B+ and ground terminals before the amp released the muting?
I centered the scope. Wave form shown at the base of 2SC4024
Audio would come and go when the protection circuit cycled. eventually staying on.
Using a TRipplite 40 amp power supply at the bench.
13.83v with remote off
13.76 with remote on, Mind you the rectifier diodes are currently removed.
Audio would come and go when the protection circuit cycled. eventually staying on.
Using a TRipplite 40 amp power supply at the bench.
13.83v with remote off
13.76 with remote on, Mind you the rectifier diodes are currently removed.
.5 I believe my probes are X10 attenuation. there is no identification on them. The X1 window says 50m
At the moment all four rectifier pairs are removed. Nothing is getting hot and the protect Led is green.
When rectifiers are installed the protect circuit goes on and off for about 2 minutes then goes green and stays on. Q709-712 get very warm. Audio on all channels sounds clear. Not how I believe the amp should operate.
When rectifiers are installed the protect circuit goes on and off for about 2 minutes then goes green and stays on. Q709-712 get very warm. Audio on all channels sounds clear. Not how I believe the amp should operate.
Power supply transistors. The ones that are driving the primary windings of the power transformer.