Electrohome G07 - Low B+ (114.1V)

arcaderob

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Hi,

I have a G07 that I can't get the B+ above 114.1V using the variable POT. It does adjust though. I am using a light bulb for the load and the HOT is not connected. I think I checked all the 900 Resistors (good), X901, X902, FR901, F901, D905 and the POT.
I took some voltage reading with POT maxed:

X901 Schematics Measured

Base 121V 115.3v (adjusts with POT)
Emitter 120.5V 114.7V (adjusts with POT)
Collector 145V 149V

X902

Base 7.6V 6.5V
Emitter 7V 5.9V
Collector 71V 50V

Any help would be appreciated. Thanks.volt.jpg
 
Hi, just updating this thread with the solution for Low B+. I swapped out all the 9XX components from a working G07 one by one. All resistors, caps, etc. Zener Diode D905 when swapped solved the B+ issue. The Diode tested GOOD when in the PCB with one leg disconnected. It was almost the last 9XX component to be swapped.

Thanks
Robert
 
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