5-1
Chapter 5 MTR3000 Power Supply
5.1 Overview
This section provides an overview and probing of the Power Supply (PS) module’s output to isolate
fault.
For specifications of the PS, refer to the MOTOTRBO
TM
MTR3000 Base Station/Repeater Basic
Service Manual (68007024096).
5.2 Troubleshooting
5.2.1 Basic Voltage Check Procedure
This section is to illustrate measurement of the 28.6 VDC, 14.2 VDC, and 5.1 VDC sources if a
known good AC or DC source is applied to the Power Supply but there is no apparent activity from
the station.
To check the basic voltage for station failure, such as no power indicated to the station when the AC
and DC mains are connected, perform the following steps:
1. Turn on station power at source (e.g. AC or DC breaker).
2. Push a voltmeter probe into the power connector at the Backplane Interconnect Board or PA
adjacent to the indicated wires. Ensure enough of the probe tip is inserted to touch the metal
Pin inside the connector housing.
3. Touch the other voltmeter probe anywhere on the chassis (or either casting) to complete the
measurement circuit.
To measure the 14.2 VDC and 5.1 VDC, refer to Figure 5-1 For the pin-out, refer to Figure 5-2
Figure 5-1 Measuring 14.2 VDC and 5.1 VDC (other voltmeter probe to chassis)
14.2 VDC (either blue wire)
5.1 VDC (either red-white wire)
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