[1000mp] 1000MP Power Supply Problem

[pp5ms at pp5ms.com]

Hello John,

I had the same problem some time ago. The solution is to change one 
electrolitic capacitor on the power supply board.

I can´t remember the location and value (I did not write down), but I 
remember that he was small capacitor like a 10 or 22uF x 50 Volts.

If you look the board, it will be easy to find, the capacitor is in the 
region of the output wires (black/red). If I remember well, does not exist 
another capacitor like this on the board.

I think that this capacitor is on the feedback circuit in the regulator, and 
with passing of the time it loses the value, making fall the voltage cames 
down.

Hope this can help you,

73,
Marcus - PP5MS

----- Original Message ----- 
From: <9m6xro at amsat.org>
To: <1000mp at mailman.qth.net>
Sent: Wednesday, October 29, 2008 3:44 AM
Subject: [1000mp] 1000MP Power Supply Problem


>
> FT-1000MP optional built-in AC Power Supply Assembly (Q7000166) is
> giving me a problem. The output voltage has dropped to around 6-8 volts,
> not even enough to drive the display. The voltage is also very unstable.
> There is no Yaesu part nr on the power supply but when I opened it up I
> found the PCB marked : FUTABA FP 1406A. Does anyone have a circuit
> diagram for this power supply? Or have you experienced a similar
> problem? Thanks for any help you can give.
>
> 73 - John - 9M6XRO
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