When that has happened to me, it has been due to bad diodes in the ALC
circuitry. Those diodes are to generate the ALC voltage without which the
power amplifier can oscillate and almost instantly draw excessive current.
Be really careful with that 252 power supply. As originally made, they have
no crowbar circuitry. Thus if the pass transistor shorts, the supply will
put 25 volts into the rig -- somewhat shortening the rig's life. Ten-Tec,
realizing the oversight, later sold an "Over Voltage Protection" circuit
board, an OVP they called. It was a small board, perhaps one by two inches
and had an SCR, a zener diode and a fuse. It mounted inside the rear panel
of the supply. I suggest you check there and see if it is present. When
installed, the large red wire to the supply's output comes from that small
circuit board. The OVP is no longer available from Ten-Tec but someone can
surely send you the schematic.
Good luck with your Omni-D
73, Mike N4NT
----- Original Message -----
From: "Ken Johnsson" <kenj@eastex.net>
To: <tentec@contesting.com>
Sent: Monday, February 20, 2006 9:00 PM
Subject: [TenTec] Help
I am a new owner of a Omni D and when turn up the drive, it kicks the P/S
off, all help would be appricated
Ken N4ALP P/s the Ps is a 252 m
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