Test Voltages; Control Board Voltage Test Points; Table 25 - Control Board Test Points - Voltages - Keyscan CA250 Series Technical Manual

Test Voltages

After applying power to the control board, use a voltmeter and verify voltages at the test points as outlined in
Table 25 and Table 26.

Control Board Voltage Test Points

The following table lists correct voltages for the control board's test points. Be sure to review the notes
opposite the appropriate voltage test points to comply with proper measuring techniques.
Voltmeter Connections
 Voltmeter set to VDC
 V-Ω (ohms) to test points
 Com to ground lug in metal enclosure
Board Test Point
Reader Terminal
D1 WHT
D0 GRN
PWR RED
TP1
TP2
TP3
TP4
TP5
Input Points
Input points with open circuit
Input points shorted to common
return
Keyscan Inc. – Technical Guide (PC109x - 07.15)
Table 25 – Control Board Test Points - Voltages
Voltage
(+) 5 VDC
(+) 5 VDC
(+) 12VDC
(+) 13.5 VDC
(+) 13.5 VDC
(+) 13.5 VDC
(+) 5 VDC
(+) 3.3 VDC
(+) 5 VDC
0 VDC
Instructions/Notes
White data 1 – if reader connected
Green data 0 – if reader connected
Red DC out
Reader power
ACU power
ACU power after circuit protector
125