Heater voltage is off [resolved]

Larpy · 789

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Offline Larpy

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on: December 30, 2020, 09:57:48 AM
I finished the power PCB and installed it above the PT.  Did the measurements per the instructions and everything checks out perfectly except for the 6.3 V reading.  I'm getting 11.5 V DC.  Is that alarmingly high?
« Last Edit: December 30, 2020, 01:35:10 PM by Paul Birkeland »

Larry

Offline Paul Birkeland

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Reply #1 on: December 30, 2020, 10:35:52 AM
Yes, like the regulator isn't doing any regulating.  Can you post some photos top and bottom of that board?  Also triple check that the 1085 is on that board and not an MJE5731A.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Larpy

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Reply #2 on: December 30, 2020, 11:31:55 AM
Found the problem!  I missed two solder connections, at one leg of the 124Ω resistor and at one leg of the 499Ω resistor.

Just goes to show you how easy it is to miss what's right in front of you.  Thank you for confirming that there was a problem and that it was probably something concerning or the nearby the 1085 regulator.

Larry

Offline Paul Birkeland

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Reply #3 on: December 30, 2020, 01:35:02 PM
I'm pretty sure you did all the work here, I'm glad you got it sorted out.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

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