[Test-Equipment] Help with IFR service monitor info?

Mon, 18 Feb 2002 13:35:33 -0700

Sounds like a regulator problem. As it heats up the supply voltage is
dropping. Have you checked to see that the 10Mhz Ref Out amplitude
doesn't change? That would eliminate the oven/osc.

AFAICR the gen has an autoleveler cct. One the bypass caps has probably
gone leaky , dragging down the reference voltage. Check the amplitude 
pot wiper to see that the voltage is unchanging.

Give my your fax number and I'll see what I can do (after I find the manual).

Robert

[email protected] wrote:
> 
> Hi guys -
> 
> I've been fighting with a problem on my IFR AM/FM-1000A service monitor and
> it turns out that my service manual only has about half the schematics in the
> binder  -grrrrrrr!   It looks like I'll need to find copies of the schematics
> for the "AM/FM Generator" module and the "10 Mhz Oven/Osc" module.
> 
> IFR has indicated they are no longer "supporting" this unit - even to the
> point of not being willing to make courtesy photocopies for me (strange).
> Oh, well... does anyone have a complete service manual that has those pages?
> 
> BTW - the problem I'm seeing is a smooth drop off in generator output as much
> as 20 dB shortly after the unit is turned on.  Ring a bell for anyone?
> 
> Steve  WD8DAS
> 
> [email protected]
> 
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