Motorola GP328/GP338 Portable Radios Service Manual

About this manual

This document serves as a detailed service manual for the Motorola GP328 and GP338 handheld portable two-way radios. It provides comprehensive technical guidance for maintenance and repair, including safety warnings regarding RF energy exposure and operational cautions.

The manual contains extensive controller information with specific schematics for various frequency bands (136-174MHz, 29-42/35-50MHz, etc.) and PCB revisions. It also includes sections on keypad board theory of operation, troubleshooting charts, and parts lists.

What's inside

• Safety and General Information
• Operational Warnings
• Controller Board Schematics
• Keypad Board Information
• Troubleshooting Chart
• Model Chart and Test Specifications

Frequently asked questions

What is the duty cycle for occupational RF exposure compliance?

The radio complies with FCC exposure limits at duty cycles of up to 50% talk-50% listen.

What is the recommended separation distance between a handheld radio and a pacemaker?

A minimum separation of 6 inches (15 centimeters) must be maintained when the radio is turned ON.

Where can I find the parts list for the Keypad Board?

The Parts List for the Keypad Basic is located in Section 5, subsection 3.0.