Motorola Two Way Portable Radio Ht1000 Jt1000 Mt2000 Mts2000 Mtx Series 6881200c75 B Manual

29
Disassembly and 
Reassembly
6
!
C a u t i o n
THIS RADIO CONTAINS STATIC-SENSITIVE 
DEVICES. DO NOT OPEN THE RADIO UNLESS 
PROPERLY GROUNDED. TAKE THE FOLLOWING 
PRECAUTIONS WHEN WORKING ON THIS UNIT.
1. Store and transport all complementary metal-
oxide semiconductor (CMOS) devices in 
conductive material so that all exposed leads 
are shorted together. Do not insert CMOS 
devices into conventional plastic “snow” 
trays used for storage and transportation of 
other semiconductor devices.
2. Ground...

30
GeneralSince this product disassembles and reassembles without the use of 
any screws, it is important for the technician to pay particular 
attention to the snaps and tabs, and how parts align with each other.
NOTE:In the disassembly/reassembly procedure, the 
numbers in parentheses refer to call-out 
numbers in the referenced figures.
Disassembly to Board 
Level1. Turn off the radio.
2. Remove the battery (see Figure 4).
a. Hold the radio such that the battery is tilted down.
b. Press down on the...

31 b. Pry the bottom of the chassis free from the cover by pushing 
the separation tool down and rotating the handle of the 
separation tool over and behind the base of the radio. This 
prying action forces the thin inner plastic wall toward the 
base of the radio, which releases the two chassis base tabs.
NOTE:A flexible ribbon cable (front cover/display 
flex), which connects to the front cover 
assembly and the chassis, keeps you from 
completely separating the two units.
c. Lay the chassis down, and...

326. Disconnect the front cover display flex from the connector on the 
chassis.
NOTE:A special locking connector secures the flex to 
the chassis (see Figure 7).
a. Use the flex connector opening tool, large curved end 
(Motorola part no. 6680334E08), or like instrument to help 
raise the sliding portion of the connector approximately 1/8 
of an inch from its seated position. A slight prying action will 
achieve the best results for unlocking the connector.
b. Remove the flex from the chassis...

33 NOTE:A large portion of the controls flex is attached to the 
large metal shield (front shield) with adhesive. Do not 
remove the controls flex from the front shield.
9. As a unit, separate the control top, the front shield, and the 
controls flex from the chassis and circuit boards (see Figure 8).
NOTE:Three locking clips (four tabs on early front shield) 
secure the front shield to the chassis and hold the RF 
board and the controller board in the chassis. 
a. Loosen the front shield by prying each...

34
NOTE:The RF board and the controller board are 
connected together with a stiff connector strip 
(P301/P704. See Figure 9.
Disassembly of 
Control Top1. Remove the rubber controls seal from the control top.
2. Turn the control top such that the grey switch housing cover is 
facing up.
a. Five retaining clips hold the switch housing cover to the 
switch housing. Clips 1, 2, and 3 are important during 
disassembly (see Figure 10).
NOTE:To perform step 2b, two tools will be required; 
your thumbnail or...

35
4. The remainder of the controls flex is attached to the switch 
housing with adhesive. Do not remove the flex from the switch 
housing unless it is absolutely necessary.
Disassembly of Front 
Cover Assembly1. On top display model radios only, release the display board by 
using a “press and pull” action on the top two corners of the 
display board. Press down on the two top corners of the display 
board and pull the top of the board away from the two corner 
retaining tabs. The display board will...

36
replacing the microphone, leave the microphone in the boot.
4. Remove, if necessary, and replace the sound dampening pad.
5. As necessary, replace the speaker and/or microphone while out of 
the front cover housing.
NOTE:If the microphone is replaced, ensure that the 
microphone is reinstalled back into the rubber 
boot with the microphone port facing the 
round hole at the bottom of the boot.
6. On front display model radios only, notice that the keypad/display 
board is secured to the front cover...

37 2. Press the rubber microphone boot into its respective recessed area 
in the front cover housing. The little rubber flap in the back of the 
rubber boot should fold up to cover the microphone insertion 
opening.
3. Reinstall the speaker retainer bracket (see Figure 13).
a. Position the spring bracket over the speaker, and toward the 
top of the front cover housing; insert the appropriate two legs 
of the bracket into their respective slots. 
b. Grasp the center portion of the spring bracket (ring...

385. On top display model radios only, seat the display board by 
inserting the two display board tabs into their mating slots in the 
front cover housing. Push the top of the display board toward the 
top of the radio until the front cover housing retaining tabs 
engage the display board and secure it into position.
ChassisInside of the chassis where the RF board fits is a protruding block that 
functions as the PA heatsink. To help provide maximum heat transfer, 
ensure that the PA heatsink block (top...