4.1 - 82 MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 400 MHz
Open Loop Power Test (Cont.)
Check Tx line up from
LNODCT U6002 output till RF
ldmos driver Q4001 input,
replace damaged parts.
Perform the Open Looop Power
test again.
Perform the following:
1. Visually check all components and solder connections around
LNODCT.
2. Check E6002 and ODCT pins 34, 40, 53, 63 for 2.775Vdc_ODCT,
check pins 51, 52 for 5Vdc during TX slot; check ODCT pins 45, 46,
56, 57 for 2.3 Vdc during Tx slot.
Replace damaged
components. Perform
the Open Loop Power
tuning and test again.
A
Is power <-4dBm?
Yes
No
Are all checks OK?
Yes
No
B
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