Select -> Rated Audio and verify the audio output levels into a rated load. Select Receiver -> Front-End Filter Tuning .
Note: Software alignment is preferred using the CPS Service Tab. Manual alignment via test points is for advanced repair only.
At each frequency point, key the radio and adjust the software slider to match the factory specifications: Target 25 Watts . High Power Models: Target 45 Watts (VHF) or 40 Watts (UHF) . Save the data before moving to the next frequency point. Modulation Deviation Alignment motorola gm3688 service manual exclusive
The GM3688 is restricted to occupational use only to satisfy FCC RF energy exposure requirements. The service manual emphasizes:
Ensure the TX_ON line transitions to a high state (typically 5V) when PTT is pressed. 4. Exclusive Alignment & Tuning Procedures Select -> Rated Audio and verify the audio
Connect the radio's antenna port to the RF communications analyzer.
(Apply 12V to enable automatic ignition turn-on). Manual alignment via test points is for advanced repair only
Everyone knows to hold the side buttons for the self-test. But the service manual reveals the (usually entering via specific button combos on power up). This lets you:
Step-by-step instructions to safely open the chassis without damaging internal ribbon cables.
5. Alignment Procedures Using Customer Programming Software (CPS)