Datasheet
44895L Rev. 3 3/15/04 S400/S600 Maintenance Manual Page 4-29
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When a printhead or power supply board is replaced, the printhead voltage must be
adjusted for the proper value. This adjustment provides the voltage applied to the print
elements during the printing process.
1. Calculate the proper printhead voltage using the formula or values found in
Table 4-4 on page 4-30 for the S400 or Table 4-5 on page 4-30 for the S600.
2. Refer to Figure 4-28 on page 4-35. Remove the rear cover.
3. Refer to Figure 4-31 on page 4-39. Attach a voltmeter between F2 and ground on
the main logic board.
4. Turn the printer On (l), and let it complete the Power On Self Test.
5. Refer to Figure 4-24 on page 4-31. Locate RV2 on the power supply board and
adjust until the voltmeter reads the value determined in step 1.
Caution:
The printhead voltage adjustment is critical to the life of the printhead. Do not use this
adjustment to try to increase printing darkness.
Notes • The S400 printhead resistance value can be read from the fork bracket
label RXXXX (where XXXX is the value in ohms).
The S600 printhead resistance value can be read from the label on the
printhead (R=XXX ohms).