Motorola Mototrbo - 4.0 MMP USB (Device Mode) Troubleshooting Chart

1-4 MMP USB (Device Mode) Troubleshooting Chart
4.0 MMP USB (Device Mode) Troubleshooting Chart
Is Pin 7(D-) Low and
Pin 8(D+) high of J4000
connector ?
Yes
PC or Host does not
recognize radio through
MMP USB port
MMP USB
OK
After connecting
USB cable to host is
TP4001 &
U1002 pin 5 @5V?
Check E4001 &
VR4000
If U1002 Pin1 Logic
Low?
Check Q1000,
U1002 & U1001
Check FL4001,
U1004 & U1001
Did hear attach/
detach tone?
No
Control Head
Cable installed
properly?
Reattach Control
Head Cable
No
Yes
No
Yes
Yes
No
No
Yes
Is Q4001
Pin 5 low ?
No
Is Q4001
Pin 3 high ?
Yes
Check
Q4001,R4030,
U1001
No
Is Q1001 Pin 2
and
pin 3 high
Check
Q1001,
U1001
Yes
No
Check
U1006,
U1005
Yes
Faulty
accesorry
Replacing
accessory. Did
it work?
Check
R4032,R4036,
R4031
Yes
No