Control Head Cm300/Pm400 Troubleshooting Chart; Control Head Failure - Motorola 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