Motorola H44YXN7139AN Manuel - Page 9
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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.