Re: 25" Amplifone Monitor (voltage regulators)

> 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.

79xx should use insulator 78xx doesn't need to, when its a negative chassis
ground.

using a metal screw to bolt the 79xx regulator to the heatsink defeats the
object of the 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

Andy

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Received on Fri Mar 8 08:41:22 2002