[1000mp] Mark V turn-on, power-up issue

[Mike Schatzberg]

Hello Glenn:

When your radio goes dark, does the receiver or the transmitter have any functions working?

Is the outboard supply still supplying proper 12 and 30 volt output when the radio has gone dark?

73 and Happy DXing,

Mike
W2AJI

-----Original Message-----
From: Glenn Rattmann <k6na at cts.com>
Sent: Monday, February 16, 2009 4:21 PM
To: 1000mp at mailman.qth.net
Subject: [1000mp] Mark V turn-on, power-up issue

List,

I've had an intermittent turn-on issue with one of my Mark V 200-Watt 
radios, where it won't light up at all.  I have two rigs and two 
FP-29 (and two cables), so I have definitely isolated the problem to 
the one radio.  The radio also more than once has just gone black 
unexpectedly while in use, and won't restart when this happens.  If 
it sits cold for a week or two, it might come back up normally, only 
to fail again later.  Lots of wiggling around with the DC cable/FP-29 
hasn't fixed it.  I searched the 1000mp archives for FP-29 or other 
power-up issues and didn't see anything exactly like this.

I've got this radio spread all over the bench now.  The DC cable 
comes to the rear apron and meets a Molex-type bulkhead mount 6-pin 
connector there.  I've removed the connector from the rear 
apron.  The six conductors in the harness go almost to the front of 
the radio, under the fan, where four of them curve back to the power 
input board accessible by removing the fan and the heatsink/amplifier 
module.  The other two conductors (light gauge) terminate in a little 
connector mounted to a bracket near the power-on switch, but 
interestingly there is no mate to that connector-- it's just floating there