Replacing The Control-Head Board; W3 Control Heads - Motorola ASTRO W3 Service Manual

Troubleshooting: Replacing the Control-Head Board
7. Pull the retaining wire up into position so that the interconnect board can be slid back away
from the front of the radio, and then up and out from the radio chassis.
8. Remove the rubber gasket from the front of the interconnect board by pulling it up and over
the D-connectors.
9. Gently pry each of the arms on the interconnect board spacer so that the snap feature on the
arms can be slid past the interconnect board.
10. Place the interconnect board spacer onto the new interconnect board, making sure that each
arm is aligned in the proper slot and snaps securely into place.
11. Replace the rubber gasket, retaining wire, coaxial cable, bottom cover (torque four screws to
6-8 in.-lbs), and interconnect board screws (torque two screws to 10-12 in.-lbs).
12. Turn the radio top side up and re-insert the ribbon cable (38-conductor) by first connecting the
command board side and then the interconnect board side. This cable is connected to two
38-pin connectors. The cable is keyed so that the cable fits only in the correct position.
13. Fold the ribbon cable down flat. Replace the top cover and torque the two screws to 6-8 in.-
lbs. These screws are self-tapping and caution should be used so that the screws properly
enter the previously cut threads.
5.6

Replacing the Control-Head Board

5.6.1

W3 Control Heads

NOTE: Numbers shown in brackets in the following procedure refer to item numbers in
"W3 Hand-Held Control Head Exploded View," on page 7-2
Control Head Exploded View Parts List," on page 7-2
1. Remove the strain-relief boot (part of cable assembly [15]) from the housing assembly [7] by
applying downward pressure on the boot and pulling it away from the control head until they
are completely separated.
2. Carefully remove the rubber seal (part of cable assembly [15]) from the housing assembly [7]
opening.
NOTE: Take care to avoid damaging this seal.
3. Using a small screwdriver, remove the seal support wedge [14] from the control head.
4. Using a small screwdriver to depress the telco lever, remove the telco connector (part of
cable assembly [15]) from the control head, and pull the cable assembly away from the
housing (like a telephone jack).
5. Remove the rear-cover assembly [2] from the control head.
6. Locate the recesses in the lower portion of the housing on both sides of the rear-cover's snap
features and, prying the snaps until the two parts separate, remove the rear cover from the
unit.
7. Remove the two snap retainers [4] from between the circuit board [5] and the housing
assembly [7].
8. Disconnect the microphone assembly [8] connector from the circuit board [5].
9. Carefully remove the microphone cable assembly from the keypad [6].
10. Carefully pry the housing's snap features from the circuit board [5].
NOTE: Be careful to avoid damaging circuit-board components.
There are seven snaps locking the circuit board to the housing. As the snap features are
deflected, push the circuit board upward, using the keypad, to release the circuit board from
the snap features.
6881096C77-O
, and in Table 7-2, "W3 Hand-Held
.
September 26, 2003
5-7
Figure 7-1,