UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Hameg HM307-3 Cleaning and Repair

WaveyDipole · 22nd May 2019, 9:58 am

BTW, forgot to mention that if you are satisfied that the resistors are OK and that the CRT is not influencing the reading, then you might be able to balance out the amplifier with EY1 and EY2 still disconnected and 15v applied so that both sides have an equal reading by using R223, but first check that the pot and R196 are both OK as well.

What voltages do you have at pin 1 and 14 of IC001?
Did you remove the broken FETs completely from the circuit?

22nd May 2019, 9:58 am	#16
WaveyDipole Nonode Join Date: Mar 2013 Location: Leicester, UK Posts: 2,535	Re: Hameg HM307-3 Cleaning and Repair BTW, forgot to mention that if you are satisfied that the resistors are OK and that the CRT is not influencing the reading, then you might be able to balance out the amplifier with EY1 and EY2 still disconnected and 15v applied so that both sides have an equal reading by using R223, but first check that the pot and R196 are both OK as well. What voltages do you have at pin 1 and 14 of IC001? Did you remove the broken FETs completely from the circuit?