Troubleshooting Chart 1-10, Sb9600 Bus Rx - Motorola MCS 2000 Service Instructions Manual

Troubleshooting Troubleshooting Chart 1-10, SB9600 BUS RX

Troubleshooting Chart 1-10, SB9600 BUS RX

Perform the following while sending data.
68P81083C20-D
START
i.e. Control Head button press,
Channel Change, Radio OFF/ON.
Voltages on
No
SB9600 Voltage
Table correct?
Yes
Data
No
J0403-6,
J0403-18?
Yes
Data
No
U0401-2 pin 6,
U0401-2 pin 5?
Yes
Data
No
U0105-13?
Yes
Data No
U0105-14?
Yes
Data No
U0103-63?
Yes
Check
U0103
Failure No
persists?
Yes
GOTO SB9600
Tx Chart 1-11
Note: For SB 9600 operation the SCI RX,
SCI TX, and Busy paths must all function.Ê
Correct as required.
Suggestion: Check for
shorted zener diodes.
Check VR0420,
VR0419
Check R0410,
R0411, C0437
Check
R0130, U0401
U0105 Yes
OK?
No
Repair or replace
U0105
Check
R0129
Problem
Fixed
Check
Q0103, VR0428
MAEPF-25955-O
December 6, 2004
9-27