Motorola Mototrbo - Troubleshooting Charts; 1.0 Controller Troubleshooting Chart

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Section 1
TROUBLESHOOTING CHARTS
1.0 Controller Troubleshooting Chart
Pass
Power-Up
Self Check
Controller
Check
Speaker &
Controlhead
OK?
9.3V @
U3100-pin5?
5V @
U3108-pin1?
Controller
OK
9.1V@ E0009?
Q0001 Pin1
=2.8V
Check Q0002-
pin1 for 0V
Volume knob
funcitonal?
Go to Power-Up
Self Check
No
Yes
Yes
Yes
No
Go to Controlhead
charts
Check these conditions @
U3100 (pin4=13.2V; pin2=0V;
pin1=1.26V) before replacing
U3001.
Yes
No
Check these conditions @
U3108 (pin3=9.3V; pin2=4.0V)
before replacing U3108
No
Yes
Yes
No
Yes
Apply on channel frequency and
standard modulation and check
U3200 pin23 to see the audio
level varies with volumne knob
turn. If not, check to see there is
an activities on I2C bus by probe
at TP3201 and TP3202 test
points.
No
Yes
If no I2C activities, then there is
possible of no connection
between OMAP BGA pins to the
traces. Try reflow OMAP (U1001)
first or x-ray for possible BGA
short.
No
Check SPI programming
to U0000 IC.
Check
Lock_Detect
1.8V @ R1065
No
Check U0000's GPO Register
settings.
Yes
9.45V @
E0700?
Check these conditions @
(Q3000 & Q3001: pin1=13.0V,pin2=9.45V, pin3=13.6V)
(U3000: pin1=4V,pin2=5.13V,pin3=5V,pin8=13.6V)
(Q3002: pin1=4V,pin2&4=13V,pin3=3.35V)
No
13.6V @
E4005?
Apply power to radio so that DC
voltage is measured 13.6V at
RAW_BAT testpoint
Check F4000 fuse
before replacing
No
Yes
Go to FGU/VCO Troubleshoot
chart