Motorola MTP700 - Page 191

TRANSCEIVER 800 MHz MTP700 Portable Radio / Detailed Service Manual 4.2 - 69
DC Distribution (V4_2.775V) Test
Use this test on a unit with the following symptoms: no V4_2.775V.
Check Q202 pin 2
for 2.775Vdc
Is the voltage OK?
No
Yes
Check traces to the Rx
section, Freq. Gen.
Section, and Tx section
Replace E205
Yes
Check Q202 pin 3
for 3.3Vdc
(Filt_3.3V_GCAP3)
Refer to the DC
distribution (V2_2.775V)
Test flowchart.
Check Q202 pin 1
for 3.0Vdc reference
voltage (V4DRV)
Is the voltage OK?
No
Is the voltage OK?
Yes
No
Is the voltage OK?
Yes
No
Check Q202,
replaced if required.
Replace GCAP3
(U200).