Replacing The Vacuum Fluorescent Display (W4, W5, And W7 Control Heads); Removing The Display; Installing The Display; Replacing The Remote Back-Housing Interface Board - Motorola ASTRO W3 Service Manual

Troubleshooting: Replacing the Vacuum Fluorescent Display (W4, W5, and W7 Control Heads)
5.3 Replacing the Vacuum Fluorescent Display (W4, W5, and W7
Control Heads)
5.3.1

Removing the Display

1. Figure 5-1
opposite the side of the display with the soldered leads.
2. Wear finger protection to prevent cutting your fingers on the sharp edges of the glass. Pull up
on the edge of the display (see
cut through the remaining shock pad.
3. Unsolder the leads from the PC board to remove the display. Use organic solvent to remove
the remaining shock pad and adhesive residue from the board.
5.3.2

Installing the Display

1. Apply the adhesive-backed shock pads to the new display. Carefully align the solder leads
and insert the display into the PC board.
2. Solder the leads of the new display to the PC board. Do not reuse the old display.
5.4

Replacing the Remote Back-Housing Interface Board

5.4.1

W4, W5, and W7 Control Heads

1. Unplug the microphone.
2. Disconnect the control cable from the control head on remote models.
3. Remove the two front-panel screws using a 2.5 mm hex-key driver.
4. Grasp the front panel firmly, and carefully unplug the control-head assembly from the radio or
remote control-head back housing.
5. Remove the two remote back-housing interface attachment screws.
6. Remove the remote control-head interface board from the remote control-head back housing.
6881096C77-O
below, Detail A, shows the removal procedure. Cut through the shock pad located
KNIFE
SHOCK
PAD
Figure 5-1. Replacing the Vacuum Fluorescent Display
Figure 5-1
DISPLAY
DETAIL A
DETAIL B
above, Detail B), bending the solder leads. Then
5-5
September 26, 2003