Motorola MTP700 - Page 114

4.1 - 80 MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 400 MHz
Closed Loop Power Test
This test should be carried out only after the successful completion of the previous tests.
Tune the radio on PATS.
Is the radio close
loop output power
<28dBm or 31dBm?
Yes
No
OK
Check coupler U5001 and R5001, R5002,
R5003, C6057, L6009, C5001, C6038.
Replace if faulty and repeat the close loop test.
Does the close loop
power problem still
exist?
Yes
No
OK
Measure the LO power on pin 24 MVCO of
the LNODCT U6002 (800-400m Vp-p (single
ended) swing into a 50 ohm load.
Does the close loop
power problem still
exist?
No
Yes
Replace LNODCT, perform Open Loop
Power test and Close Loop Power test.
OK