6-14
DECcolorwriter 1000
6
Troubleshooting
6.
If no problems are found in the previous steps, then you can assume that the
print engine control board is driving the drum motor incorrectly; replace the
engine control board.
White portion of print is colored
1.
If the thermal head is transferring wax to the paper when it shouldn't, the
thermal head is too hot. Thermal head voltage control may be bad; check the
power supply thermal head voltage. Measure the power being supplied to the
thermal head (refer to the earlier topic “Verifying power supply operation” on
page 6-3).
2.
Replace the print engine control board. Refer to the Chapter 8 topic “Engine
control board” on page 8-39.
Color is uneven
1.
The paper may be slipping in the drum's paper clamp. Clean the paper clamp.
See Chapter 5.
2.
Check the drum's paper-clamping pressure; if it's too low the media could be
slipping. If the clamp springs are weak and cannot firmly hold a sheet of
media, replace the drum. Refer to the Chapter 8 topic “Drum” on page 8-19.
3.
Check the drum for side-to-side play; there should be none. If the drum does
move from side to side, remove the drum and add a drum shim washer. The
shim washers are included in the hardware parts kit. Refer to the Chapter 8
topic “Drum” on page 8-19.
4.
Check the drum drive belt for proper tension. Refer to the Chapter 9 topic
“Drum belt tension adjustment” on page 9-11.
5.
Ensure that the drum pulley is correctly mounted on the drum shaft. The set
screws should be driven against the flat cutouts in the drum shaft. Ensure that
one of the set screws fits into a countersunk recess in its flat cutout.
6.
Be sure that the thermal head leaf spring (which presses against the right end
of the thermal head when it's in its print position) is in good contact with the
thermal head. If it isn't, bend the leaf spring until it makes good contact and
keeps the thermal head from making any side-to-side motion during printing.
7.
Check for a defective drum motor drive. Ensure it doesn't jerk, chatter, or lug
down.
8.
Test the torque limiter located next to the right end of the transfer roll's supply
spool. It should rotate in one direction only, and it should offer a small
amount of resistance to being turned. The torque limiter supplies a constant
amount of back-tension to the motion of the transfer roll to keep it taut.
9.
Check for nicks or burrs in the paper path (particularly the front cover) that
could impede the loading of a sheet of media into the paper clamp.
Summary of Contents for DECcolorwriter 1000
Page 11: ...Service Manual xi...
Page 16: ...Service Manual xv...
Page 56: ...2 24 DECcolorwriter 1000 2 Installing the Printer and Drivers...
Page 64: ...3 8 DECcolorwriter 1000 3 Verifying the Printer and Host Connections...
Page 70: ...4 6 DECcolorwriter 1000 4 Key Operator Training...
Page 170: ...8 46 DECcolorwriter 1000 8 FRU Disassembly Assembly...
Page 190: ...9 20 DECcolorwriter 1000 9 Checks and Adjustments...
Page 195: ...Service Manual A 5 Field Replaceable Units List A...
Page 198: ...A 8 DECcolorwriter 1000 A Field Replaceable Units List...
Page 204: ...C 6 DECcolorwriter 1000 C Wiring Diagrams...
Page 208: ...D 4 DECcolorwriter 1000 D Test Pattern Generator...
