Gasboy CFN Series Site Controller III Start-up - Manual (Page 71)

MDE-4793A CFN Series Site Controller III Start-up Manual for CFN III Versions 3.5 and above · November 2008 Page 65
ICR DC Power Measurement and Adjustment
ICR
+5 VDC Measurement
For +5 VDC measurement in the ICR, proceed as follows:
1 Unlock, unscrew, and lower the face of the ICR.
2 Measure the +5 VDC between the top of the resistor R7 (+) and the case of crystal Y1 (-)
(
Figure 10-2 ).
The voltage should be +5.00 to +5.10 VDC.
• If the voltage does not fall within this range, adjustment is necessary. Follow the steps in
“+5 VDC Adjustment” to adjust the supply.
• If the voltage is within tolerance, skip to “+12 VDC Measurement” on page 66 .
Figure 10-2: ICR +5 VDC Measurement Point
+5 VDC Adjustment
For +5 VDC adjustment in the ICR, proceed as follows:
1 Turn off the AC POWER switch in the ICR.
2 Remove the two white connectors on the power supply labeled DC OUT and AC IN.
3 Remove the four 5/32-inch nuts on each corner of the power supply, and remove the supply.
4 Being careful that it does not touch any of the circuits on the front door, lay the power supply
on a non-conductive surface (such as heavy plastic or cardboard).
5 Reconnect the two connectors on the power supply labeled DC OUT and AC IN.
6 Attach the meter probes to R7 and Y1 on the CPU PCB.
7 Turn the AC POWER switch back on.
Be careful not to touch anything but the adjustment screw. High voltage exists at various
points on the supply and the circuit mounted on the rear of the supply.
WARNING