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Motorola GM3688 Service Manual: The Exclusive Guide to Maintenance and Repair

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The service manual is the primary technical resource for qualified technicians to perform maintenance and repairs. It typically covers: Motorola GM3688 Service Manual: The Exclusive Guide to

6. Test Points & Voltage Reference

(Reference locations vary by board revision) Check microphone element and preamp bias

Knob Removal: Pull the volume and channel knobs straight off.

Check microphone element and preamp bias.
Measure AF levels at test points; inspect speaker and audio amplifier components.
Verify de-emphasis/emphasis network components and filter capacitors.

The manual details the core hardware capabilities of the radio: 64 memory channels. Power Output: 1–25W or 25–45W depending on the frequency band. Frequency Range: 136–162 MHz, 146–174 MHz.

Maintenance Software: Requires specific Motorola programming software (CPS) to configure dual priority scanning and busy channel lockout.