User's Manual

Maintenance GMH Series VHF Radio
Page 5-6 BK RADIO
2. Remove the 3 screws from the System board.
3. Disconnect the front flex cable.
4. Lift out the System Board by lifting the front of the board first, then pulling the back flex through the
casting.
5.3.3.4 System Board Reassembly
1. Insert the System board in the housing, carefully threading the back flex through the casting.
2. Attach the Synthesizer cover with the 4 screws. Insure that the rubber tubing is in the cavity above
the large rectangular capacitor C119.
NOTE: When reassembling the Synthesizer and VCO, snug down the screws on the covers or
malfunctions may occur.
3. Attach the System board with the 3 screws.
4. Insert the other flex cable.
5.3.4 The PA Assembly
1. Using a 7/16" deepwell socket, remove the hex nut from the antenna connector on the back of the
heatsink housing.
2. Remove the 13 screws from the PA board.
3. Remove the PA board from the heatsink housing by pushing the power connector and antenna
connector.
4. Remove the Accessory board by removing the one screw on the back.
NOTE: During reassembly, press the heatsink housing evenly against the core assembly while
inserting the 4 screws. Tighten screws at diagonal corners to seat the heatsink
housing firmly. Install the remaining screws.
5.3.5 Unit Assembly
To assemble the unit, complete the disassembly procedure in reverse order.