Motorola MTP700 - Page 107

TRANSCEIVER 400 MHz MTP700 Portable Radio / Detailed Service Manual 4.1 - 73
DC Distribution (V4_2.775V) Test
Use this test on a unit with the following symptoms: no V4_2.775V.
Are both voltages OK?
Check Q202 pin1 for 3.0Vdc
reference voltage (V4_DRV).
Check for 2.775Vdc on C291
(V4_2.775V) and on C340
(V4_LNODCT).
Check Q202 pin2 for
2.775Vdc.
Yes
No
No
Yes
Is the voltage OK?
Is the voltage OK?
Is the voltage OK?
Check
Q202, replace if required.
Refer to the DC Distribution
(V3_2.775V) Test flowchart.
Replace GCAP3 (U200).
No
Yes
Yes
Check E205 or E214.
No
Check traces to RFCU, RXU,
TXPA; TXFE and LNODCT.
Check Q202 pin3 for 3.3Vdc
(FILT_3.3V_GCAP3).