[UK-CONTEST] G-650C Rotator problem

[g3ory at lineone.net]

Chris,

My G-600RC controller has twice 'lost' the input op amp/comparator as a
result of lightning strikes within 400m of the antennas (NOT direct strikes
onto the antennas). At least it uses discrrete component technology and
is thus fairly easy to fix.

73

Bob


>-- Original Message --
>From: "G3SJJ" <g3sjj at btinternet.com>
>To: "UK-Contest" <uk-contest at contesting.com>
>Date: Tue, 28 Jan 2003 19:53:08 -0000
>Subject: [UK-CONTEST] G-650C Rotator problem
>
>
>I haven't had to fault-find or repair a rotator before so this one has
stumped
>me. Beam
>and indicator fixed at 290 degrees. Dial lights up but no rotation of indicator
>or beam.
>Motor voltages appear reasonable :
>
>AC Volts             Left        Right
>YLW to RED       30          15
>YLW to GRN       15          30
>
>
>Pot DC Volts across          BLU WHI =  1v but 10v when dissed rotator
>Return Resistance across  BLU WHI = 330 when dissed from controller
>(125m of HD  7way "trailer" cable to rotator)
>
>My thinking is that it is a DC system failure in the controller but I don't
>have a cct
>diag and also the pcb has a number of surface mount components. This is
a
>real nuisance
>coming just a few days before the FOC Marathon. Another week and it would
>have done me
>until spring time. At least the 10m beam is pointing to States.
>
>1 - Anyone willing to loan a G-650c controller for the weekend?
>2 - Are replacement PCBs available
>3 - Any helpful suggestions?
>
>Chris G3SJJ
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