RE: 25" Amplifone Monitor (voltage regulators)

The 7924, which is on the opposite corner of the board from the HV
transformer needs to be insulated.

This should be done with a mica insulator and nylon screw.

JB

-----Original Message-----
From: Gregory S . Erway [mailto:gerway@redcom.com]
Sent: Friday, March 08, 2002 10:50 AM
To: vectorlist@synthcom.com
Subject: Re: VECTOR: 25" Amplifone Monitor (voltage regulators)

Sorry. I meant that the mounting tab of the 7824cv regulator (for +24v)
can NOT have continuity with any of the 3 pins of the VR or else I
would blow something up (based on the schematics). I just wanted to
verify this since I don't have one here in front of me and I plan on
doing some more work tonight.

My main concern is the way the 7924cv is mounted. I assumed a metal screw
but if pin 2 and the tab on the 7824cv have cont then I would have
pin 2 of the 7924cv hooked to ground through the heat sink bar and through
pin 2 of the 7824cv. Not a good situation.

Sorry for the type.

Greg

On 2002.03.08 11:26 Gregory S . Erway wrote:
> This is sort of a follow up to my previous thread in the sense that I
> checked some stuff last night and replaced a few parts and now have
> a few questions.
>
> Voltage Reg 7924cv inserted in VR2 is used to regulate -24v. This was
> missing from my HV board all together when I got it. There was nothing
> in that component space. So I assumed that I needed to get TO-220
> hardware to mount the reg when I put it in. I notice that pin 1 of the
> reg goes to a trace that goes to ground (this is verified on the
schematic).
> I also noted that pin 2 of the 7924cv and the mounting tab have
continuity.
> I did not replace the 7824cv last night but am pretty sure that pin 2 of
> that regulator (or any pin of the 7824cv) can have continuity with the
> mounting tab since both regulators are mounted to the same metal heat
> sink bar. Can anyone verify this for me? Or did I do a major screw up and
> use a metal screw to mount VR2 when it should have been plastic or
> something? The manual is absolutly no help in trying to figure out what
> the mounting method would be. I know that VR2 is suppose to use an mica
> insulator (which I did) and VR1 (7824cv) is not suppose to use a mica
> insulator.
>
> I was also wondering if heat sink compound should be used on VR1 (7824cv)
> even though there is no insulator. My assumption is yes.
>
> Thanks in advance for any help provided. And if I screwed up here any
> hints as to what components I fried (probably in the supply of the
> voltage to the regulator from the deflection board) and should check
> would also be appreciated.
>
> Greg
>
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Received on Fri Mar 8 10:09:40 2002