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Phaser 840/850/860/8200 Color Printer - Service Manual
Inspecting the power supply fuses
Three fuses (F1 - F3) are mounted on the power supply.
1.
Turn off the printer and remove the power cord.
2.
Remove side and rear covers.
3.
Remove the screws securing the power supply.
4.
Disconnect the wiring harnesses plugged into the right side of the power supply and
remove power supply.
5.
With a DMM, determine that the fuses on the power supply are functional. Measure the
resistance of all fuses to LINE as indicated on the power supply’s shield.
If any fuse opens, the power supply does not function and should be replaced.
Caution
Fuses F2 and F3 are used for the AC heaters within the printer;
they protect the power supply from, most often, a shorted triac. If
F2 or F3 blows, replace the power supply rather than the fuse.
Otherwise, with the fuse replaced, but the triac shorted, AC power
may be applied to the heater without the printer even being turned
on, resulting in a thermal runaway condition.
If the fuses are functional, but the printer's power supply does not output DC voltages,
proceed to the topic, "Testing for shorted drivers" on page 3-83. Also refer to SF157.
Fuse F1 is for the DC power supply, all DC outputs.
Fuse F2 is for the following heaters:
■
H3 Jet Stack Left
■
H4 Paper PreHeat
■
H10 Jet Stack Right
■
H11 Reservoir #2
■
H12 Drum #2
■
H14 Reservoir #4
Fuse F3 is for the following heaters:
■
H1 Drum #1
■
H2 Reservoir #1
■
H5 Black Ink Melt
■
H6 Magenta Ink Melt
■
H7 Cyan Ink Melt
■
H8 Yellow Ink Melt
■
H9 Cap Wipe Heat
■
H13 Reservoir #3
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