Ericsson 19B802884P1-P3, Руководство по обслуживанию, Страница: 2 / 14

LBI-39060
2
EARPHONE
Impedance
2K ohms
Frequency Response 300 to 3000 Hz
ENVIRONMENTAL
Operating
-30°C to +60°C
Storage -40°C to +85°C
MAINTENANCE
The following procedures should be followed when
replacing or repairing any of the major replaceable
components such as the back cover, cord, front cover, etc.
It is recommended that only major assemblies as
identified on the drawings be replaced in order to maintain
the dust and waterproof integrity.
BACK COVER, ALL VERSIONS
1. Ensure O-rings are seated against screw heads before
installing.
2. Ensure main (large) O-ring is seated in groove in
cover before installing.
3. Ensure cover is oriented properly (recess for label on
top) before installing.
4. Tighten four (4) screws by hand just until cover is
seated. Then tighten each screw in turn to ensure even
compression of O-ring.
CAUTION
Over tightening will result in a stripped housing
and/or broken fastener, either of which will
compromise seal.
FRONT COVER, ALL VERSIONS
1. Remove back cover by removing four (4) screws
securing housing.
2. Unsolder all printed circuit board (PCB) connections
and remove PCB as indicated in paragraph "PCB".
3. Remove and re-install cable assembly as indicated in
the paragraph "Cable Assembly".
4. Install PCB as indicated in paragraph "PCB" and
resolder all connections.
5. Re-install back cover as indicated previously.
Copyright© April 1994, Ericsson GE Mobile Communications Inc.
CABLE ASSEMBLY, ALL VERSIONS
1. Remove back cover by removing four (4) screws
securing housing.
2. Unsolder connections to PCB as indicated in
paragraph "PCB" and remove the PCB.
3. Remove all traces of epoxy from around cable and
pull cable out of hole. Remove all traces of epoxy
from the inside and around the cross-shaped hole.
Discard the used U-shaped clamp(s) and O-ring.
4. Install cable assembly into housing, ensuring that the
strain relief crimp tab is up (facing away from the
front of the housing) and strain relief is aligned with
cross-shaped hole. The strain relief should be flush
with inside surface of the housing when correctly
installed. If necessary, a small amount (1 drop) of
lubricating oil may be applied to O-ring to help seat
the cable assembly.
5. Use whatever combination of U-shaped clamps is
required to retain assembly.
PCB, ALL VERSIONS
1. Unsolder wires from cable assembly, microphone,
speaker and dome switches.
2. Remove four (4) screws securing the PCB to the front
housing.
3. Before re-installing the PCB, set rotary switch
(HI/LO/OFF) to position 4 (a white line on switch
shaft will align with No. 4 on the switch base). Also
ensure that HI/LO/OFF knob pointer is in the 3
o'clock position, as viewed from the front.
4. Ensure that leads from microphone assembly are
routed through the hole on the PCB and that the
rotary switch shaft engages with the HI/LO/OFF knob
before securing the PCB with the four (4) screws
removed in Step 2.
5. Resolder all connections and replace back cover
assembly using the four (4) screws removed in Step 1.
EMERGENCY DOME SWITCH, ALL
VERSIONS
1. Remove back cover by removing four (4) screws
securing housing.
2. Unsolder switch leads and remove solder from PCB
holes.