Re: Hameg HM307-3 Cleaning and Repair
Thanks for that WaveyDipole, here is how I got on:
With the four pin connector to the Y-preamp board removed 0V was measured on the base of both TR123 and TR124.
I applied 15V to the base of TR123 and TR124. I've only got a single output bench PSU so I improvised to apply voltage to both transistors.
Collector of TR124- 89V
Collector of TR123- 93V
Emitter of TR124- 14.9V
Emitter of TR123- 15.5V
The voltages are not quite balanced but are close. Nothing appears on the CRT.
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