Maintenance Object Repair Procedures
555-233-123
10-1634 Issue 4 May 2002
Tape Maintenance and Repair Procedures
This section contains commonly used procedures to resolve tape alarms. The
following equipment may be needed to complete these procedures:
■ Tape Cartridges (3)
■ TN774 Tape Drive Circuit Pack (1)
■ TN773 Processor Circuit Pack (1)
■ TN770 Memory Circuit Pack (1)
NOTE:
In the following repair procedures, the term “main tape(s)” is used to
refer to the tape(s) that were physically present in the tape drive(s) at
the time the problem occurred. The “main tape(s)” should not be
confused with the term “backup tape(s)” Backup tapes are physically
stored outside of the tape drive(s). The term “new tape(s)” refers to
the three new tapes that you should bring with you to the customer’s
site; these tapes may be needed to complete the tape maintenance
procedures. The new tapes should not have been used previously in
the customer’s system. It is very important to keep track of these
tapes.
1. Check the Error Log for power-related problems and refer to the POWER,
DC-POWER, and CARR-POW Maintenance documentation sections. If no
power errors exist, check the tape drive for power as follows:
■ If there is a problem with the 12V supplied to the tape drive, its
yellow LED will be in a blinking mode. The 12V is supplied by the
631DB or 676B power unit in a multicarrier cabinet system and by a
WP91153 in the single-carrier cabinet system. This problem can
also be caused by a failure in the 984D DC power converter on
TN774 Tape Drive circuit pack.
■ If there is a problem with the five volts supplied to the tape drive,
there is no visible way to determine this except by using the TN2036
Voltage Range circuit pack (see the “Troubleshooting Backplane
Voltage Problems” section in Chapter 5, ‘‘Routine Maintenance
Procedures’’ or by using the following procedure:
Insert a tape cartridge into the tape drive. There should be a
spinning noise indicating that the tape drive is doing a short
retension pass. If there is no noise, the power may be disconnected.
2. Check for a dirty tape drive head.
■ Clean the tape drive head (refer to the ‘‘Tape Drive Head Cleaning
Procedure’’ section, which immediately precedes this section).
■ Reinsert the main tape cartridge (for example, the tape that was in
the tape drive). Make sure the tape is not write-protected.
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