Specifications

6. If the display label does not look like Figure 7–2B, adjust R152 (10
turn potentiometer) on the SMMC board until the display label looks
like Figure 7–2B, or as close as possible.
7. Set the power switch OFF, disconnect the power cable, remove the
SMMC board, set jumper J7/J8 to the J7 (normal) position, and
replace the board. Close the shroud cover and replace the ribbon
cartridge.
8. Run the ASCII print test. If the print quality is still unsatisfactory,
proceed to Section 7.5. If the print quality is satisfactory, replace
the logic board retainer, replace the left side panel, and return the
printer to service.
7.4 Null Voltmeter Amplitude Adjustment
The null voltmeter amplitude setting is based on obtaining a null volt-
meter reading at the SMMC board.
NOTE
Before proceeding to step 1, observe that potentiometer R153
on the SMMC board is not missing or factory set (glued to
prohibit adjustment). If R153 is missing or factory set, proceed
to Section 7.5.
1. The print shuttle must be set active (shuttle drive motor ON) by
setting jumper J7/J8 to the J8 position on the SMMC board. Reinstall
the SMMC board in its slot.
2. Connect the power cable, set the power switch to ON. The print
shuttle should be active.
3. Set the voltmeter to 0.5 volts full scale, and connect the meter’s
positive (+) lead to TP6 and the negative (-) lead to TP5 of the SMMC
board.
4. Adjust R153 (one turn potentiometer) for a reading on the voltmeter
as close to 0.0 Vdc as possible. The ideal reading should be less than
0.1 V dc.
5. If the null reading is equal to or greater than 0.3 Vdc, replace the
SMMC and/or the Linear Velocity Transducer (LVT) and return to
step 1.
PRINT QUALITY ADJUSTMENT PROCEDURES 7–5