Digital Equipment DECcolorwriter 1000, Руководство по обслуживанию

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Service Manual
6-17
Troubleshooting
6
Wrinkling
An example of wrinkling is shown in Appendix B “Color Test Patterns.” Wrinkling
occurs when the transfer roll is not maintaining smooth, even contact between the
thermal head and the paper; instead, it is wrinkling and rippling.
1.
Clean the thermal head. Refer to the Chapter 7 topic “Cleaning.”
2.
Inspect the front idler roller. Ensure that the two sleeves are properly located
on the idler roller and that they line up correctly with the drum. The sleeves
should be firmly attached to the roller; they should not slide or rotate on the
roller. Note that the right sleeve is located 2 mm (0.08 in.) inside the right
notched edge of the drum. Refer to Figure 6-4, “Proper front idler
roller-to-drum alignment (to prevent wrinkling),” on page 6-17.
3.
Determine if the transfer roll has been unrolled and then rolled up again.
Uneven packing in the transfer roll causes uneven tension which results in
wrinkling.
4.
Inspect the thermal head for damage. If it is damaged, replace it. Refer to the
Chapter 8 topic Figure , “Thermal head,” on page 8-17.
Figure 6-4. Proper front idler roller-to-drum alignment (to prevent
wrinkling)
8699-92
2 mm