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).
Содержание IMPRES Tetra MTP700
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