G
GanjaTron
Guest
Hi folks,
anybody here have experience repairing the Tektronix 4500 series of
desktop graphics computers? I've got a 4502 here that seemingly resets
in 1sec intervals, with repeated clicking from the speaker and
flickerin BUSY light. The screen glows uniformly green, but nothing
else. Totally unresponsive. Nada.
A scope showed bus activity, but also in a repeating pattern, with the
signal briefly collapsing in time to the speaker click. The supply
lines check out ok, as far as I can tell without a service manual.
Anybody got one?
Thanks for any hints,
--Roland
anybody here have experience repairing the Tektronix 4500 series of
desktop graphics computers? I've got a 4502 here that seemingly resets
in 1sec intervals, with repeated clicking from the speaker and
flickerin BUSY light. The screen glows uniformly green, but nothing
else. Totally unresponsive. Nada.
A scope showed bus activity, but also in a repeating pattern, with the
signal briefly collapsing in time to the speaker click. The supply
lines check out ok, as far as I can tell without a service manual.
Anybody got one?
Thanks for any hints,
--Roland