Operating instructions

DMH Series VHF Radio Maintenance
BK RADIO Page 5-5
5.4.2.1 CONTROL BOARD
1. Pull off the two rotary knobs from the front of the radio and remove rubber resistance
washer behind volume knobs.
2. Using the spanner tool, remove the nuts holding the rotary switches in place.
NOTE: The spanner tool (076-01475-0000) has been modified for use with DMH radios.
Older spanner tools may not have sufficient depth.
NOTE: These 2 nuts do not have the same thread pitch and are not interchangeable.
During reassembly, replace each nut in its original location.
3. Carefully remove the Control board by prying it up.
NOTE: During reassembly, check that the microphone jack is seated properly in the
housing before tightening the nuts on the rotary switches.
5.4.2.2 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.
5.4.2.3 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.
5.4.2.4 RECONNECT CONTROL HEAD
1. Attach flex cables before placing control head onto the 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.