Button/Tones Select Error (1 Of 2); Button/Tones Select Error - Motorola CM Series Service Information

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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