700RB Power Amp and supply.pdf700RB Preamp.pdf
The +15v. supply is about .6v. with the preamp board connected, and goes up to about 8 volts with the preamp board dis-connected. D5, D6 and Q19 pass diode checks. D12 checks ok and is new.
>Collector Q9 - 37.7
>Cathode D12 - 9.35
>Cathode D5 / Anode D6 - 8.66
>Cathode D6 - 7.97
>Emitter Q9 – 8.98
Possibly U1 is bad? Pin 2 reads exactly the same as pin 8. 7.98 v.
The +15v. supply is about .6v. with the preamp board connected, and goes up to about 8 volts with the preamp board dis-connected. D5, D6 and Q19 pass diode checks. D12 checks ok and is new.
>Collector Q9 - 37.7
>Cathode D12 - 9.35
>Cathode D5 / Anode D6 - 8.66
>Cathode D6 - 7.97
>Emitter Q9 – 8.98
Possibly U1 is bad? Pin 2 reads exactly the same as pin 8. 7.98 v.
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