Motorola MTP700 - Page 178

4.2 - 56 MTP700 Portable Radio / Detailed Service Manual TRANSCEIVER 800 MHz
Digital Analysis Test
Use this test for troubleshooting the main board.
After completing
the setup procedure,
power on the unit.
Does the power
supply show
current of 0.02
to 0.1A?
Initialize RCE.
Use the digital
diagnostic SW.
Replace the
Main Board.
Is the power
supply current
correct now?
Did the unit
pass the
initialize RCE
test?
Replace the
Main Board.
Refer to the
Main Board
DC Flowchart
Check for a
defective REDCAP2
(U301) & GCAP3
(U200)
Is the
power supply
current OK?
Is the 32kHz
clock from
GCAP3 TP316
OK?
Is the
16.8kHz
clock from
WPIC correct?
Refer to the DC distribution
(V2 – 2.775V)
Test flowchart.
Check for a
defective REDCAP2
(U301) & GCAP3
(U200)
1. Refer to the DC
distribution (V2 – 2.775V)
Test flowchart.
2. Check for a
REDCAP2 (U301)
3. Check assembly of the RC
filters U100, U101, U102.
4. Check for defective Zener
VR101, VR102 or VR103.
1. Refer to the DC
distribution (V2 – 2.775V)
Test flowchart.
2. Refer to the RF WPIC
flowchart.
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
A
Yes
defective