Section 5 Maintenance NOTE
In order to have en ough room to move th e 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 wra p 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 tr ansmit and receive ra dio repeater cables fr om the transmit and r eceiver 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 di fficulty finding the problem ar ea 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/Indic ation Possible Solution
400Hz beep just before
transmit radio unkeys
Memory problem
Memory automatically reset
to default positions
At reset/power: > 15 errors det ected
Unit fails Reset unit: send DTMF digit from
mobile/handh eld radio to repea ter site for
> 15 seconds
ZR310 does not detect TPL
tones
Carrier LED is off
March, 1993 6880902Z68-O Section 5-2