Unscrew the T8 Torx screws securing the RF board to the chassis. 3. The Service Loop: Alignment and Tuning
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The GM3688 is known for its durability and ease of use in harsh environments. Specification 64 Channels Frequency Range VHF: 136–174 MHz / UHF: 350–527 MHz Power Output Low: 1–25W / High: 25–45W (VHF) or 25–40W (UHF) Display 8-character alphanumeric display Signaling MDC1200, Quick Call II, DTMF Dimensions 44 x 169 x 118 mm Weight ⚡ Key Features & Functions Unscrew the T8 Torx screws securing the RF
: Adjustable between 1–25W or 25–45W depending on the frequency band. Specification 64 Channels Frequency Range VHF: 136–174 MHz
Go to the Power Distribution fold-out (usually page 8-10). Probe the test points listed. If +5V is missing, the manual directs you to U402 (LM2931). If +3.3V is missing, check U403 .