16 4036B Operations and Maintenance Manual Rev. E
Perform all of the following procedures before returning the unit for service. If the unit still
appears to have a problem, then call Symmetricom, Inc and request technical support. Have the
serial number of your unit ready to provide to a technical representative.
4.1 Replacing Fuses
If you know that a local event caused blown fuses throughout a rack, you can replace the fuses in
each 4036B power entry module.
Required for this procedure:
Small flat-head screwdriver
Replacement fuse for a standard IEC 320 power entry module with fuse (5 x 20 mm, 1 A
250 V Time lag fuse)
To replace a fuse:
1. Disconnect the power cable from the back of the 4036B.
2. Using a small screwdriver, open the fuse cover on the back of the 4036B.
3. Replace the old fuses as necessary.
4. Close the fuse cover.
5. Reconnect the power cable to the back of the 4036B.
4.2 Verifying Operational Problems
If the unit does not operate properly after you have verified that:
the correct power is applied to the rear of the 4036B
and
the fuses are good,
call Symmetricom, Inc to obtain a Returned Materials Authorization and return the unit to TSC
for repair.
4: Troubleshooting the 4036B
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