8.1 Ge n e r a l 63
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Chapter 8: Service
8.1 General
This chapter provides basic service information for the Model 425 gaussmeter. Cus-
tomer service of the product is limited to the information presented in this chapter.
Lake Shore service personnel should be consulted if the instrument requires repair.
The purpose of this chapter is to help determine if there is a simple solution to your prob-
lem, or if something is out of working order. If you verify that there is something wrong
with your instrument, do not attempt to open the instrument as there are no serviceable
parts inside; contact Lake Shore for service (section 8.9).
8.2 General
Troubleshooting
If the Model 425 registers a reading that is not appropriate to the situation, try the
following solutions.
D Referto section 8.6 for a list of error messages
D Cycle the power
D Rezero the probe (section 4.5.1.2)
D Reset the instrument to factory defaults (section 8.5)
D To determine whether the issue is with the probe or the instrument, test the
instrument with a different probe
D If none of these solutions work, contact Lake Shore (section 8.9)
8.3 USB
Troubleshooting
This section provides USB interface troubleshooting for issues that arise with new
installations, existing installations, and intermittent lockups.
8.3.1 New Installation
1. Check that the USB driver is installed properly and that the device is functioning.
Follow this procedure to check the device status:
D In Microsoft Windows®, open Device Manager.
D Locate the Ports (COM & LPT) device type. In many instances this will
be between the Network adapters and Processors items. If the Ports
(COM & LPT) item is not already expanded, click the + icon.
D Lake Shore Model 425 should appear indented underneath Ports
(COM & LPT) or Other Devices. Select Lake Shore Model 425.
D Click Properties. Refer to section 6.2.3 for details on installing the
USB driver.
2. Check that the correct communication port is being used. In Microsoft Windows®,
the communication port number can be checked in the Device Manager window,
under the Ports (COM & LPT) device type.
3. Check that the correct settings are being used for communication. Refer to
section 6.2.2 for communication port configuration details.
4. Check cable connections and length.
5. Send the message terminator.
6. Send entire message string at one time including the terminator. (Many terminal
emulation programs do not.)
7. Send only one simple command at a time until communication is established.
8. Be sure to spell commands correctly and use proper syntax.
8.3.2 Existing
Installation No Longer
Working
1. Power the instrument off, then on again to see if it is a soft failure.
2. Power the computer off, then on again to see if communication port is locked up.
3. Check all cable connections.
4. Check that the com port assignment has not been changed. In
Microsoft Windows®, the com port number can be checked in the Device Manager
window, under the Ports (COM & LPT) device type.
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