Hello all!
The amplifier went silent once and then wouldn't turn on. I used 6 ohm speakers and listened quietly.
All transistors are good condition.
I couldn't find a shorted transistor.
The green led light is ok.
The amplifier went silent once and then wouldn't turn on. I used 6 ohm speakers and listened quietly.
All transistors are good condition.
I couldn't find a shorted transistor.
The green led light is ok.
It wasn't coming up in a search but now it is.
Which pins of the 494 are not as they should be (DCV)?
Which pins of the 494 are not as they should be (DCV)?
Q315 looks like it could be defective but it also appears to be driven on. Remove it. Does that allow the amp to power up?
Be careful. This will disable much of the protection circuit.
Be careful. This will disable much of the protection circuit.
Hello Perry…so. Without Q315 transistor turn on the amplifier…
The current is 1A.
Two buffer cup have +-27.8V but the
Q205/206 and Q105/106 emitters have 130mV…
The current is 1A.
Two buffer cup have +-27.8V but the
Q205/206 and Q105/106 emitters have 130mV…
Yess,the sound in all channels are clean and nice.
Without Q315 :
E:0,6V
C:4,4V
B:570mV
Q316:
E:5V
C:11,6mV
B:5V
Without Q315 :
E:0,6V
C:4,4V
B:570mV
Q316:
E:5V
C:11,6mV
B:5V
The voltages don't seem right. Do this again but, this time, place the black meter probe on the emitter of Q315 to get the readings.
Resistance R315 emitter to the ground terminal of the amplifier? << no power applied
Resistance R315 emitter to the ground terminal of the amplifier? << no power applied
Between Q315 Emitter and the GND terminal is 0Vdc.
#14 this measuring i use the GND terminal to black wire..
#14 this measuring i use the GND terminal to black wire..
I need the voltage on the 6 transistor terminals and the resistance from Q315 (not R315) emitter to the ground terminal (no power applied). The emitter of Q315 would obviously be 0.000v since that's where your black probe will be.
Which 6 transistors?
The resistance beetween Q315 emitter and the GND is 0Ohm.
Sorry,but i have language barriers 🙂
The resistance beetween Q315 emitter and the GND is 0Ohm.
Sorry,but i have language barriers 🙂
Try the DuckDuckGo translator. Actually try a few translators. Convert from your language to English and then back to your language. Add a third, intermediate, language to better test the translations. Use the translator that gets the final translation back to your language the closest.
https://duckduckgo.com/?q=translate&t=h_&ia=web
I need the voltage at the same points as in post #14 but I need you to use the emitter of Q315 as the reference. The reference you used before was no good, otherwise the emitter of Q315 would have read 0.0v. A small difference in voltage makes a big difference.
https://duckduckgo.com/?q=translate&t=h_&ia=web
I need the voltage at the same points as in post #14 but I need you to use the emitter of Q315 as the reference. The reference you used before was no good, otherwise the emitter of Q315 would have read 0.0v. A small difference in voltage makes a big difference.