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2465 HV Power Supply Issue

DaveH52
 

I've finally got the LVPS straightened out and back in. I'll be taking it back out again later to replace a couple RIFA caps that haven't exploded - yet.
It powers up, after a few seconds some relays kerchunk, and the front panel lights up like it should and responds to me poking the buttons and switches.
The problem now is there's no trace on the screen where there used to be one. No sign of the CRT filament coming on. The filament checks OK for continuity, The transformer filament winding checks for continuity. Powering it up reveals no filament voltage. I'm hoping it's just something in the HV board primary circuit, since I don't want to muck around the seconday side too much. I don't want to go flying across the room!
Before I start poking around in there, are there any "usual suspects" I should consider first? Any simple checks I can do without the power on?

Thanks!
DaveH

Siggi
 

The HV is powered from the -15V unregulated supply, which is fused on the
regulator board. My first suspect would be the fuse, whether it’s blown or
suffering poor contact.

On Sat, Nov 2, 2019 at 01:04 DaveH52 <@DaveH52> wrote:

I've finally got the LVPS straightened out and back in. I'll be taking
it back out again later to replace a couple RIFA caps that haven't exploded
- yet.
It powers up, after a few seconds some relays kerchunk, and the front
panel lights up like it should and responds to me poking the buttons and
switches.
The problem now is there's no trace on the screen where there used to
be one. No sign of the CRT filament coming on. The filament checks OK for
continuity, The transformer filament winding checks for continuity.
Powering it up reveals no filament voltage. I'm hoping it's just something
in the HV board primary circuit, since I don't want to muck around the
seconday side too much. I don't want to go flying across the room!
Before I start poking around in there, are there any "usual suspects" I
should consider first? Any simple checks I can do without the power on?

Thanks!
DaveH



DaveH52
 

Siggi,
Thanks for the reply!
It wasn't the fuse.
The problem was the idiot (me) that put it back together. I managed to bend the pin on the -15V Unreg output when I mashed the connector on.