Motorola CM140 Service Information - Page 14
Browse online or download pdf Service Information for Radio Motorola CM140. Motorola CM140 26 pages. Commercial series controlhead
Also for Motorola CM140: User Manual (5 pages)
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3-2
1.2
Button/Tones Select Error (Page 1 of 2)
Button/Tones Check
Check Voltage Levels on
TP401 (Keypad Col)
and TP402 (Keypad Row)
(see table on next page)
Right
No
Voltage
Up Key
?
YES
Right
No
Voltage
on Down Key
?
YES
Right
No
Voltage
on P1/P2
Keys ?
YES
Connect DTMF Mic
to TELCO Connector
Is there
0.75 Vdc on
MIC_SENSE
R429, on radio
A
Check R846, R811
on Control Head
Check R845, R810
on Control Head
Check R813, R814
on Control Head
Check Control Head
No
connectivity continuity
and R429, R430, D401
(main board)
TROUBLESHOOTING CHARTS