[time-nuts] 5065 photo/lamp problem

[paul swed]

magnus
I was following the thread and it went quiet. Have you been able to make
progress on the 5065? Always eager to learn, because one day my 5065 will
fail.
Regards
Paul

On Mon, Jan 6, 2020 at 5:04 PM <cdelect at juno.com> wrote:

> Magnus,
>
> If you apply a +20V supply to the lamp connector you should see 125-150ma
> unlit and it drops  bit when it lights.
>
> Also measure from the lamp connector center pin to the outside conductor
> with an Ohmmeter.
>
> You should have around 3.33K. The 1.33K resistor (in series with a 2.0K)
> is a common problem. it can open up or rise in value.
>
> I usually replace this resistor in units I service even if it measures
> good.
>
> I use a 1.3K 2% MOX resistor.
>
> Also check the approx. 12 Ohm resistor on the standoffs to see if it
> opened up.
>
> If  you pull the lamp assy. you can place a spec-A lead and see the RF.
> Should be approx 88Mhz. (not critical)
>
> Once power is applied the lamp  should start (cold) within a minute or
> so, warm it starts fast.
>
> If you place a scope on A7 TP2 and with the lamp assy removed allow some
> florescent lighting to fall into the interior you should see a large 50
> or 60Hz signal from the light falling on the photocell.
>
> That is a quick check of the A7!
>
> Cheers,
>
> Corby
>
> Cheers,
>
> Corby
>
>
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