Motorola CM340

Controlhead CM140/CM340 Troubleshooting Chart 3-3
1.3 Button/Tones Select Error (Page 2 of 2)
Key_Col
Voltage
(TP401)
Key_Column Voltage TP401
0.008 V 0.675 V 1.346 V 1.997 V 2.650 V 3.300 V
0.008 V Up
0.675 V 1 2 3
1.346 V 4 5 6 7
1.997 V 8 9 0 *
2.650 V # C B A
3.300 V
Down
Left Key
P1
Right Key
P2
Idle
Key_Row Voltage TP402
No
Right
Voltage
on DTMF keys
?
Replace
Q812
YES
Button/Tones Keys
Okay
A
Does Q812
on Control Head
operates well
?
Replace U803
on Control Head
YES
No