Motorola Gm3688 Service Manual Top

: VHF (136–174 MHz) and UHF (350–527 MHz).

Check the external in-line fuse first. If intact, open the radio and trace the PCB tracks near the DC connector. Look for the surface-mount protection diode (designed to blow if reverse polarity occurs) and the main power switch transistor. Issue 2: Low or No Transmit (TX) Power motorola gm3688 service manual top