If your rig suffers from the low Tx audio problem, here's how to fix it.
1. Remove the battery and antenna.
2. Remove the "NiCd" sticker on the heat sink.
If you remove it very carefully, it's possible to re-install it later with the same stickum that's on it.
3. Look in the cavity where you removed the sticker. Proceeding from left to right, here's what you'll see...
Phillips head Screw (Holds the keypad in)
Small Silver Potentiometer (VR1001-VHF Deviation Adjustment)
Small Silver Potentiometer (VR1002-UHF Deviation Adjustment)
Small White Potentiometer (TC1001-DONT TOUCH! CTCSS Tone Adjustment!!!)
Phillips head Screw (Holds the keypad in)
4. Take a small Phillips head Screwdriver and turn both VR1001 and VR1002 about 1/8 turn clockwise.
This will increase the VHF and UHF deviation and fix the low Tx audio problem.
If it's not enough Tx audio, simply turn both pots another 1/8 turn.
Make sure to turn both pots the same amount!
5. Replace the NiCd sticker, battery, and antenna.
6. You're Done!