GBC Docuseal 2700 Service Manual page 21

6.4 Main PCB Calibration
The Main PCB must be calibrated when replaced.To calibrate the PCB use the Calibration
fixture GBC p/n 1700407 and follow the calibration procedure outlined below. Calibration must
be performed with the new board installed in the machine.
Tools needed:
•
V OM with clips on test leads
•
Calibration Fixture GBC p/n 1700407
•
Precision screw driver
•
Infrared Temperature Sensor (Non Contact Thermometer)
Calibration Procedure
1. Calibration must be performed when laminator is cold.
2. Remove center shield to gain access to Main PCB.
3. Locate and preset the trim pots as follows.
a. Turn SV -1 and SV 2 trim pots fully counter clockwise until you hear a clicking noise.
b. Turn SV -1 trim pot clockwise 5 full turns.
c. Tum SV -2 trim pot clockwise 10 full turns.
4. Disconnect temperature sensor from Main PCB and connect calibration fixture ( GBC p/n
1700407) in its place.
5. Disconnect the blue thermostat wire from the PCB.
6. Set V OM to measure DC voltage.
7. Locate test points on PCB and connect clip on leads from V OM to test points (refer to wiring
diagram in Section 5.0)
8. Locate the slide switch on the Main PCB and select the 'I' position. This is the calibrate
position.
9. Plug the laminator into a suitable 120V 60 Hz outlet.
10. Turn laminator power switch to the 'on' position.
11. Select SVl on the calibration fixture. Adjust SVl on the main PCB until you read
+13.7 V DC on the Multimeter. ( If you show -V DC on SVl you must show -V DC on SV 2)
12. Select SV 2 (DS 400,1200) setting on the calibration fixture. Adjust SV 2 on the main PCB
until you read + 7. 92/+ 7. 93 V DC on the Multimeter.
13. Confirm the settings are correct by switching between SVl and SV 2 on the Calibration
fixture and looking at the measured DC voltage on the V OM.
14. Switch the laminator to the "Off' position.
15. Move the slide switch to the 'No' position.
16. Disconnect the calibration fixture and reconnect the heat sensor to the PCB.
17. Disconnect V OM.
18. Re- attach blue thermostat lead.
14. Re-install center shield.
6.0 ADJUSTMENTS