Re: 25" Amplifone Monitor (voltage regulators)

This is exactly what I was worried about once I started using my
brain a little bit. Thank you for confirming I was just stupid.
What type of hardware is usually used to mount the 7924cv Voltage
Regulator on the Amp HV board? Plastic bolt/nut?

Thanks so much.

Greg

On 2002.03.08 11:45 Andy Welburn wrote:
>>> 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 10:11:41 2002