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Lens/source heater will not heat.
Possible Remedies
Make sure the ISQ 7000 system and the computer are properly connected.
Confirm no fuses are blown on the lens driver PCB. If a fuse is blown, make sure no heater wires are shorted ground or each other before
replacing the fuse.
Confirm the vacuum is working properly. The heaters will not heat until the vacuum is working properly.
Remove the analyzer tray and measure the electrical resistance of the lens heater and the source heater. The resistance should be
approximately 24 ohms. You could also measure the resistance of the temperature sensors, which should be resistant at 50-300 ohms.
Run Power Supply Check diagnostics to make sure the +24 V supply is working. If necessary, replace the power supply. See
System
for details.
Lens/source heater overheats.
Possible Remedies
Make sure the filament wires are not frayed, touching the analyzer tray, or disconnected from the source interface board.
Confirm the vacuum is working properly. The heaters will not heat until the vacuum is working properly.
Remove the analyzer tray and measure the electrical resistance of the lens heater and the source heater. The resistance should be
approximately 24 ohms. You could also measure the resistance of the temperature sensors, which should be resistant at 50-300 ohms.
Make sure the leads to the heaters and sensors are not electrically shorted to the tray.
Transfer line will not heat.
Possible Remedies
Make sure the ISQ 7000 system and the computer are properly connected.
Confirm no fuses are blown on the lens driver PCB. If a fuse is blown, make sure no heater wires are shorted ground or each other before
replacing the fuse.
Confirm the vacuum is working properly. The heaters will not heat until the vacuum is working properly.
Remove the right side panel and disconnect the 4-pin connector to the transfer line, as described in
the resistance of the heater circuit is approximately 6 ohms and the resistance of the heater sensor is 50 to 300 ohms. If necessary,
replace the transfer line. See
Thermo Scientific
Lens/Source Heater
for details.
2
Troubleshooting
Investigating Temperature Issues
Power Supply
4- Pin
Feedthrough. Then make sure
ISQ 7000 Hardware Manual
131
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