Technical data

4.5.4 Special Service Aids

The special service aids are listed below and described in Sections 4.5.4.1 through 4.5.4.6.

• Service Aid 513 (Head Calibration)

• Service Aid 524 (Memory Initialization)

• Service Aid 525 (Motor Calibration)

• Service Aid 533 (Door Lock and Interlock Disable)

• Service Aid 542 (Vendor ID)

• Service Aid 543 (Product ID)

4.5.4.1 Service Aid 513 (Head Calibration)

Service Aid 513 automatically calibrates the read/write head by adjusting the write current

to the head and setting the read-after-write threshold for all densities.

NOTE

A reference level tape or a known high-quality tape with a write-enable ring

must be loaded to run this service aid. The tape is written on during the

service aid, so any data previously recorded on the tape is lost.

After several minutes of running, the following events may be initiated:

• If the message PASSED 513 appears; press switch 4.

• The message SAVE NEW will appear; press switch 1 to save the new calibration values

and exit the service aid.

• To keep the old values and exit the service aid, press switch 2, message OLD DATA will

appear.

• If the message FAILED 513 appears at any time during the service aid, execution of the

service aid terminates; switch 4 must be pressed to exit the service aid.

The values calculated during the calibration can be displayed using the following procedure:

1. After the message PASSED 513 appears and before pressing switch 4, press switch 1. This

displays the write current value in hundredths of milliamps preceded by the message .95

ISAT (for example, ".95 ISAT 5000" equals 50 milliamps).

2. Press switch 2 to display the read-after-write threshold value in millivolts preceded by

the message EOUT AVG (for example, "EOUT AVG 512" equals 512 millivolts).

4.5.4.2 Service Aid 524 (Memory Initialization)

Service Aid 524 clears the non-volatile memory and sets the conﬁguration parameters to the

default values listed in Table 4–10.

NOTE

If the EEPROM (non-volatile memory) or the Interface circuit board is re-

placed, this service aid must be run.

Troubleshooting 4–21