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Maintenance and Troubleshooting
12.3 Troubleshooting
The PAT700 incorporates extended diagnostic and reporting facility to inform the user
about the nature of a problem.
Alarm codes, with user-initiated diagnostic tests, serve to isolate the source of the
problem.The PAT700 constantly monitors its operation and measurement values for
alarm conditions. See Alarms, page 117.
12.3.1 Fuse replacement
The analyzer contains two 1.25 A, 250 V EN60127 type T fuses (see Figure 123). Fuse
failure usually indicates an equipment problem that requires servicing.
To replace fuses, follow this procedure:
1. Shut off power to the analyzer.
2. Use a 5/16-inch Allen wrench to unlatch the door that contains the display.
3. Unlatch the door and swing it open on its hinges.
4. Twist the fuse holder out using a straight-blade screwdriver.
5. Replace the fuse.
6. Twist the fuse holder in using a straight-blade screwdriver.
Figure 123 PAT700 EN60127 type T fuses
Power supply wiring compartment
(terminals are behind door)
Fuses
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