[sdiy] Beckman Industrial 9060 'scope woes - no luck finding service manual

[aankrom]

On Fri, 15 Jun 2012 17:36:09 -0700, jays at aracnet.com wrote:
> AA,
>
> Sounds like you know scopes but make sure you have the triggering set
> to Normal or whatever the scope has to make its horz osc is free 
> running
> and not waiting for a trigger.
>
> In general it sounds like something in the trigger circuitry. On some
> scopes changing the vert scale puts some noise/glitches that triggers
> the scope.
>
> Jay S.

I think it's a problem in the trigger circuitry. I've been trying to 
rule out the various switches involved by spraying Deoxid in them, but 
it's probably an actual circuit problem. Without a schematic, I'll have 
to trace the wires from the switches to the circuit location. I hope 
it's just a bad electrolytic cap. that's easy to get to & replace. Or 
maybe a place that just needs the solder reflowed. I've fixed things 
that way before.

I do have a Service Manual for a Beckman Industrial 9020, but it's 
obvious from the schematics that the circuits are not similar at all. A 
cursory glance shows no 733's for input amps (which makes sense since 
mine's a 60 MHz 'scope and I assume the 9020 is a 20 MHz 'scope...).

I wish I could remember the actual manufacturer of this 'scope. 
Something like Taeco - some Japanese or Korean or Chinese company...

AA