Motorola MTP700 - Page 102

4.1 - 68 MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 400 MHz
DC Distribution (BOT_SWB+) Test
Use this test on a unit with the following symptoms: no BOT_SWB+ .
Is the voltage OK?
Check traces to 16pin connector.
Check R109 for 7.2Vdc
Check U111 pin1 for
2.775Vdc.
Yes
No
No
Yes
Is the voltage OK?
Is the voltage OK?
Check for defective zener VR100.
Check for defective Q101.
No
Yes
Go to V3_2.775V test.
Go to V3_2.775V test.
Check Q101 pin2 or pin3 for
7.2Vdc (IO_1).