help

abaloghtesla · 1570

0 Members and 1 Guest are viewing this topic.

Offline abaloghtesla

  • Full Member
  • ***
    • Posts: 50
on: March 15, 2020, 07:32:13 AM
I have been working on reduction 11 pre-amp. 120vac and i have run in some problems that i have fixed ie:shorted diode in high voltage power supplyand shorted capacitor betwen tst point 11 and 13. Once I get some parts and make a perm fix I will have all correct voltage reading as per chart except for test point 44 and 45----I am showing 80 volts for term 44 and  74.4 for 45 and not 180volts for 44 and zero for 45. I rebuilt term strip 43 to 48 with new parts after I found that shorted diode and all my voltage readings  on term strip 55 to 62 are on the money. Question is:could that be a misprint of voltage of 180  and term 44  and zero on 45 to what i show now of 80v and 74 0 v for 44 and 45



Offline Paul Birkeland

  • Global Moderator
  • Hero Member
  • *****
    • Posts: 19409
Reply #1 on: March 15, 2020, 08:49:20 AM
What caused the diode/capacitor to short?  Did you have a diode installed backwards? 

I am looking at the manual, and I see an indicated DC voltage reading of 0V for both terminals 44 and 45.  If your voltages on terminals 55 to 62 are correct, I wouldn't worry about this.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline abaloghtesla

  • Full Member
  • ***
    • Posts: 50
Reply #2 on: March 15, 2020, 12:57:47 PM
Its nice to have you get back to me. I did have a miss-wire in the high voltage section and that could have blown the diode, but I have no idea how the cap blew. It was part of a three cluster group and it was one of the group???? Once I get the spare parts I"ll let you know whats going on.