Section 5

Maintenance

NOTE

In order to have enough room to move the fan

assembly around and to remove the ZR310, you will have to cut the cable tie wrap. Make sure that you obtain another cable tie wrap for use when reassembling the GR300.

4.Using a T25 torx screwdriver, remove the two M5x0.8x8 machine screws that secure the ZR310 to the repeater housing.

5.Remove the ZR310 from the repeater housing.

6.Disconnect the transmit and receive radio repeater cables from the transmit and receiver connectors.

Top Cover Removal

To remove the top cover from the ZR310 for inspection of components and to make necessary adjustments, perform the following steps.

1.Using a #1 Phillips screwdriver, remove the four #4-40x3/16" flathead machine screws.

2.Remove top cover.

Troubleshooting

There are two forms of troubleshooting:

Finding problems with the ZR310 "system: operations. The troubleshooting charts provided in Table 2-2 will aid in resolving these system issues.

Repair of a defective ZR310. An experienced technician with the commonly available test equipment, the schematic diagram located in the back of this manual and the PC overlays should have no difficulty finding the problem area and faulty component(s).

The ZR310 schematic diagrams provide the circuit detail for isolating malfunctioning components. [The troubleshooting charts provides....]

Before proceeding with troubleshooting, scan Table 5-1 to determine if you can solve the existing malfunction. By reading this information, you could save valuable time by isolating the circuit where the faulty component os located.

Problem/Indication

400Hz beep just before transmit radio unkeys

Memory automatically reset

to default positions

Unit fails

ZR310 does not detect TPL

tones

Possible Solution

Memory problem

At reset/power: > 15 errors detected

Reset unit: send DTMF digit from

mobile/handheld radio to repeater site for

>15 seconds Carrier LED is off

March, 1993

6880902Z68-O

Section 5-2

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Motorola GR300 service manual Top Cover Removal, Troubleshooting