Specifications

8.10 Blank or White Spots

Do the following if bands, stripe, or voids appear in place of text or

graphics:

1. Try fresh dry paper. Make sure a correct type and size paper is

being used. See Digital Laser Printers Guide to Paper and Other

Media for paper speciﬁcations.

2. Swap the following:

a. EP-ED cartridge. If this ﬁxes the problem and you suspect

that the EP-ED is out of toner, consult the problem history in

the site maintenance log. If this problem occurs repeatedly,

you can suspect a failure of the toner detection circuit. See

Section 6.9 to ﬁx the toner sensor circuit.

b. Transfer roller

c. HVPSA

d. DC control board

e. HVPSA contact plate guide

8.11 Vertical White Lines

Do the following if well-deﬁned vertical lines of uniform width run

through the dark areas of text and graphics of the test print:

1. Remove the EP-ED cartridge and shake it, as shown in the

instructions that are embossed on the EP-ED cartridge.

2. Examine the following components in the path of the laser beam.

Look for hair, paper shards, dust, or other foreign matter.

• The inlet shutters of the EP-ED cartridge

• The outlet slit of the scanner assembly

3. Swap the following:

a. EP-ED cartridge

b. Scanner assembly

8–8 FIPs For Fixing Image Defects