Hi all,
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I was trouble shooting a problem with my QCX mini for 20m Rev. 3 board T1.09a
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When I would push down on the tune rate knob or even? touch the knob to adjust the volume the volume would drop off.?
So, I thought being inexperienced, I had probably made a cold or ineffective solder joint.
I went in and examined the solder joints closely. As I went along I touched them up.
I plugged it in and things seemed much better, however, after? short time I was unable to access the menu. I could pull the power and then re-plug it in and have a short time to access the menu, then it would fail again.
This seemed like a problem that Lidiette, was experiencing. I connected it to a dummy load, but the same thing occurred. I unplugged it.
I took it out of the metal enclosure plugged it in again and suddenly I had access to the menu, no problem for as long as I wanted and the volume problem didn't come back.
So, I thought that perhaps something was touching the metal case.
I had added a jumper wire to gain the battery icon on screen. It was loose.
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From the construction manual-
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"For normal operation of the radio, if you wish to see a
battery voltage icon on screen, then connect pin 1 to pin 3
of the 4-pin header. This connects the voltmeter input to the
12V supply of the radio."
In trying to repair it I slipped with a small scrapper I was using and took R41 smd off the board. Ouch!
It's 150 ohms, on the top of whats left it says 151.
I've added some attachments I hope they are viewable.? Are either of the check marked resistors an acceptable replacement for R41?
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Thanks,
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Rick
KC6UXI
Ronald Taylor