I ran out of 1B transistors so I installed an MPSA06 making sure emitter connected to ground, which in the image you attached is the top/left pad of Q801. The Zener diode blows shorted if I don't pass REM power through the 1k REM resistor. I replaced it with another 7.5v Zener.
With the MPSA06 and 7.5vDC Zener, the amp powers up WITHOUT REM attached (Which is the original condition of amp when I received it for service)
REM ATTACHED
Black probe on emitter of the NPN transistor.
remote terminal: +7.35vDC (The 1k resistor is between +14vDC and the terminal, so this is Zener voltage)
1k resistor has 14v and +7.35v on each side
D801 Zener striped side: +7.35vDC
D801 Zener non-striped: 0.008vDC
Base of Q801(MPSA06): 0.743vDC
So there's not much voltage on the NPN transistor at the moment.
With the MPSA06 and 7.5vDC Zener, the amp powers up WITHOUT REM attached (Which is the original condition of amp when I received it for service)
REM ATTACHED
Black probe on emitter of the NPN transistor.
remote terminal: +7.35vDC (The 1k resistor is between +14vDC and the terminal, so this is Zener voltage)
1k resistor has 14v and +7.35v on each side
D801 Zener striped side: +7.35vDC
D801 Zener non-striped: 0.008vDC
Base of Q801(MPSA06): 0.743vDC
So there's not much voltage on the NPN transistor at the moment.
The non-striped end of the Zener should be connected to the base of the NPN transistor.
Is the PNP transistor shorted?
Does the amp have an alternative way to turn it on (signal sense, DC into speaker level...)?
Is the PNP transistor shorted?
Does the amp have an alternative way to turn it on (signal sense, DC into speaker level...)?
Theres seems to be no auto-on switching. I have the manual for the amp here and it doesn't say anything about auto-on nor speaker sense. I'll keep this in mind but for now I think this amp is straight B+/REM/GND
Wanting to confirm something. ON the image you attached, REM connects straight to D801 striped side, Ive put a 1k resistor on REM for the time being though. Trace then from D801 non-striped side connects to Q801 "Input" on a '24' transistor otherwise the Collector on the MPSA06. (Pad is top left of Q801).
Just want to confirm, I should try moving the non-striped Zener to BASE pad of Q801 (Botton pad in your image)
Thanks
Wanting to confirm something. ON the image you attached, REM connects straight to D801 striped side, Ive put a 1k resistor on REM for the time being though. Trace then from D801 non-striped side connects to Q801 "Input" on a '24' transistor otherwise the Collector on the MPSA06. (Pad is top left of Q801).
Just want to confirm, I should try moving the non-striped Zener to BASE pad of Q801 (Botton pad in your image)
Thanks
The striped end of the Zener has to be towards the remote terminal. The other end should connect to the base of the NPN transistor.
How does the Zener have 0.008v on the terminal that's supposed to connect to the base of the NPN transistor and the base of the NPN transistor has 0.743v?
How does the Zener have 0.008v on the terminal that's supposed to connect to the base of the NPN transistor and the base of the NPN transistor has 0.743v?
The base of Q801 NPN is connected to R803, which is then connected to R801 as well as the base of the PNP (HR) transistor at Q803.
The base (input) is connected to D801. See attached.
https://www.s-manuals.com/pdf/datasheet/d/t/dtc114eca,_dtc124eca,_dtc143eca,_dtc144eca_galaxy.pdf
https://www.s-manuals.com/pdf/datasheet/d/t/dtc114eca,_dtc124eca,_dtc143eca,_dtc144eca_galaxy.pdf