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

[Glenn Rattmann]

Mike,

Usually there are absolutely no functions.  Completely dead, except 
there was perhaps one instance I recall, some months ago, where 
during the sending of about 60 watts CW the RF output went to zero or 
very low (I could see the Alpha not driving), but all the panel was 
still lit and the sidetone was still audible-- receiver worked.  In 
just that one case, a sharp (gentle ;-) ) rap of my hand on the top 
cabinet did bring it back to normal for a while.  I've never been 
able to duplicate that again.

Re the FP-29-- If the radio is OFF, and in its bad condition, turning 
on the FP-29 switch lights the red LED but DOES NOT start the FP-29 
fan.  Normally in a quiet room you can hear faintly a relay closing 
in the FP-29 at turn-on, but when the radio is 'bad' I don't think I 
hear the relay close in the FP-29, and the fan definitely doesn't 
start.  So there is feedback there from the radio I think which is 
telling the controller in the FP-29 to not power up fully.  This 
behaves the same with either of my two FP-29s, and Yaesu DC cables.

When the radio is working, either of the FP-29s or cables runs it fine.

When it is 'bad'... if everything is switched OFF, and I press the 
FP-29 switch, and I see the LED but don't hear the relay, or hear the 
fan, then I know that pressing the power switch on the Mark V is not 
going to do anything.  At that point, I'm not sure I'm going to see 
anything on the Mk V rear DC connector.

I have not tried to measure voltages yet, but can do that after I 
reassemble some of the modules to a point where it is safe to attempt power-up.

Thanks for the ideas!

--Glenn

At 03:33 PM 2/16/2009, you wrote:
>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
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