Control Head Cm300/Pm400 Troubleshooting Chart; Control Head Failure - Motorola Radius CM200 Service Manual

3-4
2.0

Control Head CM300/PM400 Troubleshooting Chart

2.1

Control Head Failure

Control Head Check
No
Back light
OK ?
YES
Power-up
No
Alert Tone
OK ?
YES
Indicator
No
LED'
S
OK ?
YES
Display No
OK?
YES
Up/Down
P1 and P2
No
Alert Tone
Buttons
OK?
YES
EXT
No
PTT
OK ?
YES
No
Communication Ok
Control Head is OK
Check 9.3V on
Q12, U1 and associated
parts and U8
Check Speaker
Connection
Check
Q8–Q10, U8 and 9.3V
Check LCD
connections, U3 for 5V,
Osc. pins 1 & 2 activity
SCI thru via U4
Check keypad resistors
Check Q13, Q802
Check Q803, Q14 and
associated parts
TROUBLESHOOTING CHARTS