User's Manual

GMH Series VHF Radio Maintenance
BK RADIO Page 5-5
5.3.2.2 Display Board
1. Remove the Control board.
2. Remove the flat spring clip by prying the end with the tab toward the top of the housing.
3. Lift out the Display board.
NOTE: During reassembly, check that the flex cable does not block the display by folding
between the display and window.
5.3.2.3 Pushbutton Labels
1. Pull out a pushbutton from the front of the radio.
2. Remove the old label by pushing from the back.
3. Insert the new label.
4. Insert the pushbutton in its original location.
5.3.2.4 Reconnect Control Head
1. Attach flex cables before placing Control Head onto Core assembly.
2. Check that coax cables are not on the lid of the harmonic filter.
3. Attach Control Head to Core Assembly with 6 flat-head screws.
NOTE: Use care to prevent breaking the 6 Control Head tabs when tightening the flat-head
screws.
5.3.3 The Core Assembly
5.3.3.1 VCO and RX/TX Boards
1. Remove the sheet metal shield from the RX(TX board by prying it up with a flat-blade screwdriver.
2. Remove the 4 screws from the VCO cover and lift off the VCO cover.
3. Carefully remove the VCO by lifting it from the center or prying it up evenly around the sides.
4. Remove the 7 screws from the RX/TX board, pull both coax leads (one at a time) through the
ferrite bead, and carefully lift out the RX/TX board.
5.3.3.2 VCO and RX/TX Reassembly
1. Insert the RX/TX board into the g, pulling the two coaxial cables through the hole in the housing.
Pull the coaxes snug and make certain they clear the 12-pin connector between the RX/TX board
and the System board. Thread each coax through the ferrite bead.
NOTE: Check that connectors are properly aligned with the System board before seating
them firmly.
2. Insert the VCO, using care to not bend the pins.
3. Attach the VCO cover and snug down the screws.
4. Fasten the RX/TX board to the housing with the seven screws.
5. Insert the flex cables.
5.3.3.3 System Board
1. Remove the 4 screws and lift off the Synthesizer cover.