Instruction manual

4–25
Adjustment Procedures
Hammer Phasing Adjustment
You must check and adjust hammer phasing if the CMX controller board is
replaced, the shuttle frame assembly is removed, or if the MPU is replaced.
The hammer phase value is a timing parameter that permits you to adjust the
vertical alignment of dots in character printing. The phase value numerical
units are relative; they do not represent a physical measurement or value.
Thus there is no “correct” value or range.
The factory prints the initial phase value on the aluminum casting of the
shuttle assembly, next to the motor housing. Adjust the phasing to this value
and recheck the vertical alignment. When vertical alignment is acceptable,
write the new phasing value on the shuttle.
Phasing should be adjusted with the printer printing at full paper width.
IMPORTANT
The printer must be printing the Phase pattern of “H’s” when the
Phasing Value is changed, or the New Phasing Value will not be written
into NVRAM. If the value is changed when not printing, the printer will
return to its default phasing value when powered off then back on.
The procedure is as follows:
1. Power on the printer.
2. Install the ribbon.
3. Load full width (132 column) paper and set the top of form.
4. If the printer is online, press the ON LINE key to place the printer
offline.
5. Raise the printer cover.
6. On the control panel, press the Y + B keys to unlock the ENTER key.
“ENTER SWITCH UNLOCKED” briefly displays. (If “LOCKED”
displays, simply press Y and B again.)
7. Press the B key. “CONFIG CONTROL” displays.
8. Press the A key until “DIAGNOSTICS” displays.
9. Press B. “DIAGNOSTICS / Printer Tests” displays.