Gasboy CFN Series Diagnostic Manual - Manual (Page 156)

GASBOY CFN Series
4-40 03/19/04
DC Power Measurements and Adjustment
+5 VDC Measurement
1. Unlock, unscrew, and lower the face of the island card reader.
2. For C05375 board: Measure the +5 VDC between the
top of the resistor R7 (+) and the case of crystal Y1 (-).
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 below to adjust the
supply. If the voltage is within tolerance, skip to Step
14.
For C05857 board: Measure the +5VDC between test
points TP1 (5V) and TP2 (Gnd). 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 below to adjust the supply. If the voltage is within tolerance, skip to Step
14.
+5 VDC Adjustment
3. Turn off the AC POWER switch in the island card reader.
4. Remove the two white connectors on the power supply labeled DC OUT and AC IN.
5. Remove the four 5/32 nuts on each corner of the power supply, and remove the supply.
6. 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).
7. Reconnect the two connectors on the power supply labeled DC OUT and AC IN.
8. For board C05375: Attach the meter probes to R7 and Y1 on the CPU PCB.
For board C05857: Attach the meter probes to TP1 and TP2 on the CPU PCB.
9. Turn the AC POWER switch back on.
CAUTION
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.
10. Using a 1/8 inch or smaller plastic, flat blade screwdriver, adjust the power supply to +5 VDC
by turning the adjuster clockwise to increase voltage, counterclockwise to decrease voltage.
Turn the screw slightly to judge how sensitive the adjustment is.
11. Disconnect the meter probes.
12. Turn the AC POWER switch off and return the power supply to its normal location. Fasten
the nuts holding the supply.
13. Turn the AC POWER switch back on.
+12 VDC Measurement
14. Measure the +12 VDC between the red (+) and black (-) wires
on the DC OUTPUT connector of the power supply. The
voltage should be +11.00 to +14.00 VDC.
NOTE: This voltage is used only for receipt printers and is not
adjustable.
15. Close and lock the unit, and replace the screws on the face.