Start
Are ALL sensors
on the board not
responding?
Go to any sensor input
on the board and
measure dc voltage
from +5 pin to ground
4.75 to 5.25
volts dc?
Yes
Remove all sensor blocks
from board, wait 10 seconds,
then measure dc voltage
from +5 pin of any sensor
input on board to ground
No
4.75 to 5.25
volts dc?
Turn power off to board
and measure for short
from +5 pin of any sensor
input on board to ground
No
Shorted?
Replace board
No
Board is defect and may
have been damaged by
overvoltage applied to a
sensor input
Replace board
Yes
Go to defect sensor input
and remove connector
block
üü
correctly?
No
Defect sensor or
wiring to sensor
Yes
Yes
Yes
Board is defect and may
have been damaged by
overvoltage applied to
the sensor input
If system uses expansion boards,
verify MCS-I/O communication by
seeing if red TX light blinks on all
boards and also check for proper
address jumper settings on all
expansion boards
Check that all sensor input
Analog / Digital jumpers
are set correctly and all
sensors are set to AUTO
No
If ANALOG sensor, connect
MCS-SENSOR-TEST block (100K ohm
1/4 watt resistor from +5 pin to SI pin on
connector base) and compare sensor
reading to Appendix J
If DIGITAL sensor,
connect jumper wire from
+5 pin to SI pin on
connector base and see if
sensor reading changes
from ON to OFF or OFF to
ON
Troubleshooting Sensor
Input Problems
Magnum Micro Controller Systems
Reconnect Sensor 1 and
measure dc voltage from
+5 pin of any sensor
input on board to ground
4.75 to 5.25
volts dc?
The sensor or wiring to
sensor you just
reconnected is shorted
to ground
Reconnect the next sensor
and measure dc voltage
from +5 pin of any sensor
input on board to ground
Yes
No
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