I
I.F.
A while ago I acquired 2x Philips PM3212, a Trio CS-1559A and a CS-1577A, I
tried alt.binaries.schematics.electronic and extensive web searches but
no-one could help with the schematics.
Of the Philips scopes, 1 has uncontrollable full on brightness, someone
suggested a diode connected between grid & cathode may be leaky - but with
no schematic or tube pinout its going to be difficult to find. The second
PM3212 suffers intermittent loss of sync. The assemblies where I think the
sync amplifier might be don't look as if they were designed with servicing
in mind, and this scope has a badly damaged case so it could be spares for
the other one!
Of the Trio scopes, the 1559 appears completely dead but some poking about
in the PSU produced brief glimpses of a trace suggesting what looks like a
switching section of the PSU might be in safety shutdown. The 1577 lights up
but there is no vertical deflection of the trace, either by a signal or the
v-shift control.
Any help would be appreciated - thanks.
tried alt.binaries.schematics.electronic and extensive web searches but
no-one could help with the schematics.
Of the Philips scopes, 1 has uncontrollable full on brightness, someone
suggested a diode connected between grid & cathode may be leaky - but with
no schematic or tube pinout its going to be difficult to find. The second
PM3212 suffers intermittent loss of sync. The assemblies where I think the
sync amplifier might be don't look as if they were designed with servicing
in mind, and this scope has a badly damaged case so it could be spares for
the other one!
Of the Trio scopes, the 1559 appears completely dead but some poking about
in the PSU produced brief glimpses of a trace suggesting what looks like a
switching section of the PSU might be in safety shutdown. The 1577 lights up
but there is no vertical deflection of the trace, either by a signal or the
v-shift control.
Any help would be appreciated - thanks.
