So I went out this morning to replace the CW filters with the upgrade
kit.
Unsoldered the 5 crystals. Removed one of them - whups, it's got the
"S"!
That means that the upgraded crystals are already installed. I thought
there
was no "S" - it was hard to read with them installed.
So I resoldered the crystals. Being in there, I gave the RF board a
scrub
with IPA. Back to the shack....
...Audio is way down. No transmit, not on CW nor on phone.
I hauled it back to the bench, got out a visor magnifier and a powerful
flashlight,
and looked over the whole board for solder splashes and cold joints.
Didn't find
any splashes. Found & touched up a few iffy joints. Found one joint
with no
solder at all - just the component lead sticking up through the hole
with air
all around it. Soldered that one.
Back to the shack. Still no joy. Guess I gotta troubleshoot it.
Hauled the scope to the operating position. Brought up the schematic.
Ready to
start troubleshooting. Punched the power button and....
....Everything works! Nice loud audio. Good transmit RF. Go figure...
- Jerry KF6VB
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