Motorola Radius CM300 User Manual

Control Head CM300/PM400 Troubleshooting Chart 3-5
2.2 Button/Tones Select Error (Page 1 of 2)
No
Check Voltage Levels on
TP401 (Keypad Col)
and TP402 (Keypad Row)
(see table on next page)
Right
Voltage
Up Key?
No
Check R13, R45
on Control Head
Right
Voltage
on Down
Key?
Check Control Head
connectivity continuity
and R429, R430, D401
(Main Board)
Connect DTMF Mic
to TELCO Connector
YES
Button/Tones Check
Check R12, R49
on Control Head
Right
Voltage
on P1–P4
Keys ?
Is there
0.75 Vdc on
MIC_SENSE
R429, on radio
Check R31, R29
R51, R11
on Control Head
A
YES
No
YES
No

Motorola Radius CM300 Specifications

General

Brand	Motorola
Model	Radius CM300
Category	Radio
Language	English