Reference Oscillator Alignment - Motorola MCS 2000 User Manual

Reference
Oscillator
Alignment
BBB
Programming Procedure
Function Key Descriptions
F6 - TOGGLE PTT
F8 - PROGRAM VALUE
Field Definition
New Softpot Value
42
From the MAIN MENU, press F2 three times to bring up the
REFERENCE OSCILLATOR ALIGNMENT screen.
MOTOROLA Radio Service Software
MCS Model:
...REFERENCE OSCILLATOR
Frequency Current Value
--------- -------------
177.9875 155
0
MIN |----+----+----+----+----+----+----+X---+----+----+----+----| MAX
F1 F2 F3
HELP
This alignment is required immediately after the radio's RF Board is serviced
or replaced. This alignment procedure warps the radio's reference
oscillator (reference frequency).
Refer to your Radio Service Manual for the Reference Frequency
Alignment procedure.
1. Key the radio by pressing F6 and then use the UP/DOWN arrow
keys to increase/decrease the frequency respectively. (A three-
minute time-out timer is enabled when the radio is keyed.) The
radio's RF output must be terminated into a 50 ohm load. To
increase the adjustment speed, use the Shift-UP/DOWN arrow
keys.
2. The radio will transmit on the Test Mode 1 frequency. A relative
adjusted value will be displayed on the status bar, but you must
determine the actual transmitter frequency from the frequency
counter or the service monitor.
3. Press F6 to de-key the radio and then press F8 to program the
selected value into the radio.
Alternately keys and de-keys the radio being serviced.
Programs the selected value into the radio.
This is the working value of the Reference Frequency (Reference Oscil-
lator). The status bar shows the relation of the setting to the mini-
mum and maximum settings.
Use UP/DOWN Arrows To Adjust Softpot.
REFERENCE OSCILLATOR
--------------------
New Softpot Value.....155
Transmitter..Off
F4 F5 F6 F7
TOGGLE
PTT
255
F8 F9 F10
PROGRAM EXIT
VALUE