Motorola Two Way Portable Radio Ht1000 Mt2000 Mts2000 Mtx Series 68p81200c40 O Manual

12
ReceiverTransmitterSignalling
Test
Service
MAEPF-22857-A
MAEPF-22858-O
Figure 40-3. Softpot Concept
Do NOT switch radios in the middle of any
!CAUTION 

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Perform the following procedures in the
sequence indicated.
B. Reference Oscillator Alignment
Adjustment of the reference oscillator is critical for
proper radio operation.  Improper adjustment will not
only result in poor operation, but also a misaligned radio
that will interfere with other users operating on adjacent
channels. For this reason, the reference oscillator
should be checked every time the radio is serviced.  The
frequency counter used for this procedure must have a
stability of 0.1 ppm...

6. Press F10, F2, then F10 again to return to the ser-
vice menu.
F. Transmitter Power
VHF and UHF radios require two power-level
adjustments, a high-power or rated-power adjustment,
and a low-power adjustment.  The low power adjust-
ment is required since the radio may be used in a
reduced power mode, or with a vehicular adapter.
NOTE 
All power measurements are to be made at the
antenna port.
1. From the SERVICE menu, press F2 to select
TRANSMITTER alignment.
2. Press F3  to select the TRANSMIT POWER...

3. With the meter selector switch (RTX4005B) set to
MIC, inject a 1 kHz tone on the AUDIO IN terminal
on the test set, 80mVrms as measured on the
AC/DC MTR port.
4. Press F6 to key the radio, and use the UP/DOWN
arrow keys to adjust the deviation per the values
shown in Table 40-16.
5. Press F6 to dekey the radio, and press F8 to pro-
gram the softpot value. Press ENTER to move to
the next softpot value.
6. Repeat steps 3-5 for the remaining frequencies
shown on the screen.
7. Press F10 to return to the...

Trunking High Speed Signalling
1. From the SERVICE menu, press F4 to select SIG-
NALLING  alignment.
2. Press F3 to select the TRUNKING HIGH SPEED
softpot.
3. Press F6 to key the radio on the test frequency.
The screen will indicate that the radio is 
transmitting.
4.  Measure the TRUNKING HIGH SPEED deviation
on your service monitor.
5.  Use the UP/DOWN arrow keys to adjust 
the TRUNKING HIGH SPEED deviation per 
Table 40-18.
6. Press F6 again to dekey the radio.
7.  Press F8 to program the softpot...

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A. General
Since 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 num-
bers in parentheses refer to call-out numbers in the
referenced figures.
B. Disassembly to Board Level
1. Turn off the radio.
2. Remove the battery (see Figure 40-4).
a. Hold the radio such that the battery is tilted
down.
b. Press down...

5. Separate the front cover assembly from the internal
electronics (chassis) (see Figure 40-5).
a. Insert a small, flat-blade screwdriver or like
instrument in the slotted area at the bottom cen-
ter of the radio. Take care not to mar the O-ring
sealing area on the housing.
b. Pry the bottom of the chassis free from the
cover by pushing the screwdriver down and
rotating the handle of the screwdriver over and
behind the base of the radio. This prying action
forces the thin inner plastic wall toward the...

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a. Use a small, thin, flat-blade screwdriver (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, alter-
nating back and forth on the top corners of the
connector, achieves the best results for unlock-
ing the connector.
b.  Remove the flex from the chassis connector.
7. Remove the contoured O-ring/antenna bushing seal
from the chassis.
8. Disconnect the controls flex from the connector on
the controller...

c. The cover will pop loose from the switch 
housing.
3. Push the three switches and the LED out of the
switch housing.
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.
D. Disassembly of Front Cover Assembly
1. On top display model radios only, release the dis-
play 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...

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E. Reassembly
Reassembly is the reverse of disassembly. Some
suggestions and illustrations are provided to help you
more easily reassemble the radio.
1. Keypad/Display Board 
(front display model radios only)
a. If applicable, replace the rubber keypad.
b. Place the keypad/display board into the front
cover housing at an angle such that the three
small slots on the edge of the board slide under
the three mating retaining tabs. Ensure that the
board slides underthe tabs.
c. Near the three larger slots...