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8
Engage the inkroll with the typedrum by pushing down on the inkroll bracket
latch.
\_,1
Note: You need not engage the inkroll with the typedrum if the 3521 will be run for long periods
without printing (the interpret feature is not used). If you leave the inkroll disengaged, it
will
increase the life of the inkroll, and will reduce the dust and ink buildup on the typedrum.
Cleaning the Typedrum
As
the 3521 runs, ink and card dust accumulate on the typedrum. If not removed, this
ink and dust buildup will affect the legibility of the printed characters .. Cleaning the
typedrum more frequently is better than waiting until the character faces on the drum
become clogged and cause a problem. For most applications, cleaning the typedrum
monthly is adequate.
To clean the typedrum:
1
Remove the inkroll as described in the "Replacing the Inkroll" procedure.
2
Install the brush cartridge exactly as if it were a new inkroll. Use the "Replacing
the Inkroll" procedure.
3
A. Close the front cover.
B. Start a job that defines the 3521 as the job's output device; for example, a key-
board to punch job.
C. Press the BLUE (Non Process Run Out) key about ten times; about ten non-
process-run-out cycles should clean the typedrum; press the BLUE key ten more
times if the typedrum is not clean.
4
Use the "Replacing the lnkroll" procedure to install the inkroll that was removed
in Step 1.
Using the Status Indicators
i
The 352l's status indicators together with the indicators on the terminal's operator panel
"-/
provide an indication of the 3521 's status at any given point in running a job. When both
of the 3521's status indicators are on, the 3521 is in a ready status, and is selected as the
terminal's input or output device.
When either of the status indicators is off (indicating a not-ready or error condition),
first check the terminal's operator panel indicators to determine the cause of the problem-
and the procedure for correcting the problem. When an error involving the 3521 occurs: ,
• The terminal
1
s operator panel PUNCH indicator will be on if the 3521 is used as a
punch.
• The terminal's operator panel READER indicator will be on if the 3521 is used as a
reader.
• All other input and output device indicators on the operator panel will be off.
• Either the OPRN (Operational) CHECK or the SYSTEM CHECK indicators will be on.
• A number displays in the operator panel's readout indicators that indicates the type of
error. Chapter 3 lists these error numbers together with the procedure for determining
the cause of and for correcting the error.
A summary of the error types displayed when either of the indicators is off follows;
Use the method described above for correcting error conditions.
IBM 3774 and 3775 Operating Procedures Guide
9-7
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