Lake Shore 625, Руководство пользователя

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Lake Shore Model 625 Superconducting MPS User’s Manual
Service 7-3
Line_Input.bmp
Figure 7-2. Power Fuse Access
7.5 FUSE REPLACEMENT
Use the following procedure to remove and replace the line fuses.
WARNING: To avoid potentially lethal shocks, turn off the power supply and disconnect it from AC power
before performing these procedures.
CAUTION: For continued protection against fire hazard, replace only with the same fuse type and rating
specified for the line for the line voltage selected.
NOTE: Test fuse with an ohmmeter. Do not rely on visual inspection of fuse.
1. Locate line input assembly on the instrument rear panel. See Figure 7-2.
2. Turn front panel power switch Off (
O ).
3. Remove instrument power cord.
4. With a small screwdriver, release the drawer holding the line voltage selector and fuses.
5. Remove and discard both existing fuses. Replace with proper Slow-Blow (time-delay) fuse ratings as follows:
100/120 V 10.0 A T 250 V 0.25×1.25"
220/240 V 5.0 A T 250 V 5×20 mm
6. Re-assemble line input assembly in reverse order.
7. Verify voltage indicator in the line input assembly window.
8. Connect instrument power cord.
9. Turn front panel power switch On (
l
).
7.6 ERROR MESSAGES
The following messages appear on the lower part of the instrument display when it identifies a problem during operation.
The Fault LED will light in conjunction with the error message. A more extensive description of the error message can
shown by pressing the
Status key. If the error condition can be cleared, it can be done by pressing the Status key while
in the error status display. Refer to Paragraph 4.17 for a description of the error status display.