[Elecraft] KIO2 help!

[Don Wilhelm]

Mike,

You mentioned that Q1 was getting hot - it does not normally.  The only
thing that I can spot on the schematic for possibilities is D4 - if it were
reversed, it would place 5 volts on the gate of Q1 and make it conduct
heavily.  The anode (unmarked end) of D4 should be closest to the edge of
the board.

73,
Don W3FPR

> -----Original Message-----
>
>   Having just completed the KIO2 module, I discovered that the
> onboard oscillator doesn't. I've isolated it, had it apart twice,
> checked all components and pcb lands, replaced the FET even
> though my analyser said it was OK. The FET is running very hot,
> perhaps 50 deg C. If I inject the required negative voltage into
> pin 8 of the IC, all voltages come up correct on the pins, so it
> doesn't seem to be anything to do with that. I'm just about to
> knock up a crystal checker, but while I do, has anyone else had
> this problem?
>
>   73 de Mike GW4IQP
>   G-QRP, K2 no 4185
>