Comnet MLS II MLSH041, Руководство по обслуживанию

Страница: 6 / 30

LBI-38425A MAINTENANCE
6
3.1.7 Disassembly
To gain access to the transmitter, receiver, and the system control/synthesizer for
servicing, loosen the four screws securing the cover at the rear of the radio. Then pull
the cover out from under the edge of the front panel and lift the cover off.
3.2 DRIVER REPLACEMENT
3.2.1 To Remove Driver HC1
1. Remove the two screws securing HC1 to the printed wire board.
2. Unsolder the four (4) leads bridging HC1 to the printed board while lifting each lead
as they are unsoldered.
SERVICE NOTE: These leads are soft and can be bent very
easily.
3. Gently lift up on the module, taking care not to damage the spacer under the module.
SERVICE NOTE: The module may stick to the printed board.
3.2.2 To Replace Driver HC1
1. Position the module properly, aligning the screw holes and leads with the printed
board. Trim leads if necessary (see Figure 1).
2. Replace the two screws securing the driver to the printed board, using a moderate
torque of 5 inch-pounds.
3. Solder the four leads of driver HC1 to the printed board and ground strap.
Figure 1 - Driver Lead Identification
3.3 PA TRANSISTOR REPLACEMENT
WARNING
The PA transistor contains Beryllium Oxide, a TOXIC substance. If the ceramic or
other encapsulation is opened, crushed, broken or abraded, the escaping dust may be
hazardous if inhaled. Use care when replacing the module.