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Table 7. Diagnostic and Maintenance Functions (continued)
Function Code H - Test Head
Causes the tape drive to perform the Head Resistance Measurements test and a Write/Read test (on the center of
the tape). The drive runs these tests to ensure that the tape drive’s head and tape-carriage mechanics are working
correctly. The tape drive takes approximately 10 minutes to run the test.
1. Make sure that no cartridge is in the drive.
2. Within a 1-second interval, press the unload button three times. The status light becomes solid amber, which
means that the drive is in maintenance mode.
Note: If a cartridge is in the drive, it will eject the first time that you press the unload button and the drive will not
be placed in maintenance mode. To continue placing the drive in maintenance mode, remove the cartridge and
repeat this step.
3. Press the unload button once per second until H appears in the single-character display.
Note: If you cycle past H, press the unload button once per second until it redisplays.
4. To select the function, press and hold the unload button for 3 seconds. After you select the function, C flashes.
When C flashes, the drive is waiting for a cartridge. Within 60 seconds, insert a scratch data cartridge (or the tape
drive exits maintenance mode). After you insert the cartridge, H flashes.
v If no error is detected, the test begins again and runs for a maximum of 10 times. Each loop takes
approximately 10 minutes to run. After the tenth loop, the test stops and the drive automatically exits
maintenance mode. To halt the test, press the unload button. The drive acknowledges the request by slowing
the length of time that the currently displayed character flashes on the single-character display (from twice per
second to once per second). The test continues to the end of its loop and then stops. The tape drive then
displays 0, rewinds and unloads the cartridge, and exits maintenance mode.
v If an error is detected, the tape drive displays 5, unloads the tape cartridge, and exits maintenance mode. To
resolve the error, locate 5 in Table 12 on page 53.
Exiting Maintenance Mode
To manually exit maintenance mode, press the unload button once per second until
0 appears on the single-character display. Press and hold the unload button for 3
seconds. The drive exits maintenance mode (the solid amber status light becomes
solid green, then turns off).
Chapter 4. Operating 37
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