Print Head/Ribbon Cartridge; Test Switches - IBM 3270 Operator's Manual

The print head forms the characters, which are printed
automatically by program control. The print ribbon is contained
in a cartridge attached to the print head. The ribbon is threaded
around the print head as shown in Figure 38. When the print
head is signaled by the program, it moves across the platen and
strikes the ribbon and paper for each letter, causing a message to
be printed on the paper.
A small test switch panel (Figure 35) having three switches is
located on the left side of the platen. All positions of the
switches are used for servicing the printer. Some switch positions
are used by the operator. You will use the switches, if required,
to carefully align the paper with the print line when installing
new paper forms. You'll also operate switches when changing the
ribbon cartridge and placing the printer in on-line and off-line
status. I nstructions for using the switches are given in the
procedures where they are used.
PRINTER TEST
PRINT PAT
CE SWITCH
MODE
START
1
PRINT
I I
ON
LN
MODE
2
PRINT BFR
Figure 35. Test Switch Panel
Printer Operation
79
Print Head/Ribbon Cartridge
Test Switches
I