Motorola H34QXN7139AN Manuale - Pagina 9

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1. Model Configuration

•

When electrically testing and/or probing the main

circuit board with the back shield removed, always

use the three finger screws on the SABER housing

eliminator service aid to provide grounding to VCO

synthesizer module U300 (two places), and the rf

ground clip (one place).

•

When removing the main circuit board from the

frame assembly, do the following:

1. Remove the back shield assembly.

2. Unplug the PTT/controls flexible circuit.

3. Remove power amplifier module U202.

4. Remove the two main compression connector

screws.

5. Lift the board at the bottom and pull out from

under the control top panel.

•

The rf and ground contacts at the top of the main cir-

cuit board are exposed when the board is removed

from the frame. Special care must be taken to avoid

accidental damage to these contacts.

G. Frame Assembly

•

The tapped tabs on the frame can be stripped if

excessive screw tightening torques are used (see

Torque Specifications table). The frame is not

repairable.

•

If you must lift or remove the PTT/controls flex circuit

for any reason, do not readhere it to the frame; the

flex must be replaced.

H. Dual-Function Switch (S801) and

Actuator Assembly

•

Before removing the switch, remove the knob by

gently separating the two arms of the switch brack-

et (located between the switch and the main O-ring

seal) and pulling upward on the knob.

•

Before reinserting the knob, ensure that the slot in

the switch is properly aligned with the blade on the

knob's shaft.

•

When the knob is properly inserted, the arms of the

switch bracket will snap into position (approximate-

ly 0.2 inches apart), the knob will not be loose in the

switch bracket, and the bracket will hold the switch

firmly against the inside of the top control panel. If

this is not the case, replace the switch bracket.

III. REASSEMBLY

Reassemble the radio in the reverse order of disas-

sembly, referring to "SERVICING MAJOR SUBASSEM-

BLIES" (Section 2) and making certain:

•

that the speaker/microphone connector (and the

LCD interconnect header on SABER II and III

radios) is correctly aligned so that no twisting or

pinching of the flexible circuit occurs when the front

shield is reattached to the frame assembly.

•

that the two extended tabs at the top of the front

shield are properly inserted into the slots between

the frame and the control top panel.

•

to tighten all hardware loosened or removed during

disassembly per the torque specifications listed in

the Torque Specifications table. Use recommended

torque driver (Motorola RSX4043A Rototorq Tool or

equivalent).

•

that there is no foreign material on the main O-ring

or stud seals.

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Inspect the frame stud seals and the top panel O-ring

and replace if any damage exists.

•

to properly orient the completed frame assembly

before inserting it into the radio housing.

that the PTT switch and monitor button are not

•

depressed while the frame is being inserted into the

housing.