Motorola MTP700 Detailed Service Manual page 198

4.2 - 76
Closed Loop Power Test
This test should be carried out only after the successful completion of the previous tests.
MTP700 Portable Radio / Detailed Service Manual
Tune the radio on PATS.
Is the radio close
loop output power
<28dBm or 31dBm?
Yes
Check the elements: coupler U806, R913,
R914, R915, C845, C846, L809. Replace if
faulty and repeat the close loop test.
Does the close loop
power problem still
exist?
Yes
Measure the LO power on pin 24 MVCO of
the LNODCT U803 (800-400m Vp-p (single
ended) swing into a 50 ohm load.
Does the close loop
power problem still
exist?
No
Check R852. Replace if faulty, repeat Close
Loop Power test. If the problem still exists
replace LNODCT U803 and repeat Open
Loop Power test and Close Loop Power test.
No
OK
No
OK
Yes
Replace LNODCT, perform Open Loop
Power test and Close Loop Power test.
TRANSCEIVER 800 MHz