4.1 - 76 MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 400 MHz
Standby Current Troubleshooting
This test should be carried out only after the successful completion of the previous tests.
No
Yes
Is standby current
below minimum
current limit?
No
OK
Yes
Check if there are shorts on the board:
-check if RF PA Q4001 is shorted to the ground.
-check voltage regulator VR201, current switch U111,
VR100, elements on FUSED_B+ and FILT_3.3V
supply lines.
Replace parts if faulty.
Repeat the Standby Current test.
Also see "GCAP" section.
Measure the radio
standby current by
using PATS station
Is standby current
above upper
current limit?
Check:
Radio Fuse F200, bead E208.
Replace damaged parts.
Repeat the Standby Current test.
Also see "GCAP" section.
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