PDP-11/83 Power Supply Wierdness

From: Christopher McNabb <cmcnabb_at_4mcnabb.net>
Date: Thu Sep 4 18:04:00 2003

My PDP-11/83 has recently (past few weeks) been displaying some odd
symptoms. The system is a PDP-11/83 in a "Corporate Cabinet". Most of
the time, when the power switch is turned on, the "run", "halt", "ready"
lights blink on then go off. Also, the Red light on the TK-50 will come
on then go off. You also hear a relay closing and opening in the rack
power supply.
About every 10th try, the DC OK light will come on and the system will
start to power up. Then all the lights go off after a couple of seconds
and the rack power supply relay clunks.

When the switch is turned off, "run", "ready", and the TK-50 light blink
on and you hear what sounds like the relay in the rack power supply
closing and opening.

Kevin, do you remember it doing anything like this when it was yours?

Christopher McNabb <cmcnabb_at_4mcnabb.net>
The McNabb Family
Received on Thu Sep 04 2003 - 18:04:00 BST

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