Table 10 Alignment Procedures - Motorola Spectra Service Manual

Procedure > Reference
Oscillator
ITEM Warping
RF BOARD First
REFERENCE Only
OSCILLATOR
VCO BOARD N/A
COMMAND BOARD Second
CONTROL HEAD N/A
BOARD
PA BOARD N/A
MEMORY BOARD N/A
*5c. Press F3, "SET TX I LIMIT," to enter the Current
Limit Adjustment screen.
*5d. Press the up arrow to step the current limit to a
maximum value of 15. (This does not equate to 15
amps of radio current.)
*5e. Press F8 to program value; then, press F10 to
return to the High Power Set screen.
6. Press F4, "HI TEST FREQ," to place the radio on
the highest test frequency. Press F6, "TOGGLE
PTT," to key the radio. Use up or down arrow keys
to adjust the relative value to obtain the correct
power output.
DO NOT use the microphone PTT during this proce-
dure; while this DOES cause the radio to transmit on
the test mode, it also corrupts the alignment data.
Set power to rated plus 10%; that is, set a 12-watt
radio to 13.2 watts; set a 30-watt radio to 33.0 watts.
Power can be set on any test frequency, but only
one setting (the most recent) will be saved.
*6a. Press F6 to dekey; then, press F8 to program this
value.
Adjust transmit current limit to a level slightly above
the maximum current drain under normal conditions.
Determine which test mode (1, 2, or 3) draws the
most current and set current limit on that mode.
*6b. Determine highest-current-drain test mode as
follows:
• Press F3 to return to the Current Limit screen.
• Press F2, "LOW TEST FREQ," to place the
radio on the lowest test frequency. Press F6 to
key the radio and measure the total radio cur-
rent drain
"TRANSMITTER ON 896.0125 MHz"). Press
F6 again to dekey the radio.
Table 10. Alignment Procedures
Deviation Power Set &
Adjustment Current Limit
Third N/A
N/A N/A
Second N/A
Fifth Third
N/A N/A
N/A Only
N/A N/A
NOTE
NOTE
NOTE
(computer will display
Compensation Compensation
Adjustment Calibration
Second N/A
N/A N/A
N/A First
N/A Fourth
N/A N/A
N/A N/A
N/A N/A
• Press F3, "MID TEST FREQ," to change to the
mid-range test frequency. Key the radio and
measure the current drain (computer will display
"TRANSMITTER ON 901.9875 MHz"). Dekey
the radio.
• Press F4, "HI TEST FREQ," to change to the
highest test frequency. Key the radio and mea-
sure the current drain (computer will display
"TRANSMITTER ON 940.0125 MHz"). Dekey
the radio. Press the F2, F3, or F4 key to return
to the highest-current mode.
*6c. Press F6 to key the radio.
*6d. Decrease the current limit relative value until the
power output just begins to drop; then, increase the
value by two increments.
7. Press F6 to dekey; then press F8 to program this
value.
*7a. Press F10 to exit the Current Limit screen.
8. Press F10 to exit the High Power Set screen.
9. At the "ALIGNMENT" menu, press F8 to select the
TX Low Power screen. Adjust the relative value to
20 and press F8 to program the value.
10. Press F4 to place the radio on the highest test fre-
quency. Key the radio with F6; adjust the relative
value to achieve one-half rated power output.
Press F6 to dekey; then, press F8 to program the
value.
Power can be set on any test frequency, but only
one setting (the most recent) will be saved.
11. This completes power set and current limit adjust-
ment. Press F10 as needed to return to the MAIN
MENU or to other SERVICE screens.
Signalling Memory
Deviation Module
Adjustment Initialize
N/A N/A
N/A N/A
N/A N/A
Sixth First
N/A N/A
N/A N/A
N/A Only
NOTE
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