User guide
40 Chapter 5: Troubleshooting
B780 Two-Color Thermal/Impact Hybrid Printer: User Guide B780 UG00001 B 10/06
Receipt print quality (continued)
Condition Possible causes What to do
Color print is light. Variations in paper. Increase energy level of print head in “Color
Density Adj” of the printer conguration menu.
See “Conguring the printer” on page 26.
Incorrect paper setting Check diagnostics setting.
Inconsistent printing, Paper type used and Print diagnostic form and verify paper type
no two-color print. paper type setting do setting to type 0, 1, 4, or 5.
not match. See “Conguring the printer” on page 26, paper
types.
Vertical column of print is missing, Print head is defective. Contact a service representative.
one side of receipt is missing, or
top or bottom half of characters
are missing.
Incorrect print head setting Check diagnostics setting
Slip station and MICR problems
Condition Possible causes What to do
Slip-in light does not come on. Form or check not Line up the form or check against the check
inserted properly. guide (wall) and slide it toward the front of the
printer until it is visible from the top (the light
should come on). Extra long forms may need to
be inserted from the side to disengage
the Form Stop. See “Printing on forms or checks” on
page 33 or “Verifying and validating checks” on pages
35-36.
Forms or checks skew or There is an obstruction Open the front cover and check for paper jams
catch in the slip station. or paper jam in the or other obstruction in the slip station.
slip station. Clear the jammed paper or obstruction.
The MICR check reader does The check is inserted Make sure the check is inserted properly with
not read or misreads checks. improperly. the MICR characters up.
See “Verifying and validating checks” pages 35-36.
The check is fraudulent. Make sure that the check is not fraudulent. On
fraudulent checks, the characters the printer reads may
be dierent from those that are visible on the check
face.
A nearby magnetic Devices, such as computer monitors, security
source is interfering devices or large metal surfaces near the
with the check reader. printer can aect the printer’s magnetic eld,
causing intermittent errors when the MICR
check reader is operating. Move the printer away
from items like this.