Will Not Print - Bosch ACS 753 Repair Instructions

Diagnostics and Testing

Will Not Print

1. Does the printer have power?
2. Does the printer have paper? Verify the
paper is installed correctly in the printer.
The paper should be rolling off the back of
the roll.
3. If the machine is operating in direct sunlight,
move it or cover the face of the printer and
try again.
Printer Has Power
If the printer has power, check the continuity of
the printer harness between the printer (P30)
and the control board (P15).
• If harness tests good, replace the printer
assembly and retest. If the harness test
fails, replace printer harness.
• Check the output of the power supply at
PSJ2. If there is 12 VDC at PSJ2, check
the power input to the control board at
CBP19.
• If printer still does not print, replace the
control board.
Printer Does Not Have Power
Verify the printer is receiving power at harness
connector P45. Test for +5 VDC across the
RED (pin 1) or YELLOW (pin 2), and BLACK
(pins 3 & 4) wires.
• If voltage is present at P30, replace the
printer assembly and retest. If not, check
for printer power at CBP15.
• The control board receives power from
the power board PBP2, through connector
P19. If the control board is not receiving
power, the printer will not function.
• If printer power is present at CBP15,
check for continuity of the printer harness.
Repair or replace if necessary. If printer
power is not present at CBP15, replace
the control board.
SP00D00609 2018-03-26
ACS 753, ACS 763, ACS 863 Service Manual
Replace the Printer Paper
1. Pull the cover open by inserting a finger into
the pocket in the cover and pull.
2. Remove the paper core.
3. Install the new roll of paper with the end
of the paper at the top of the roll, unrolling
from the back.
4. Feed the paper out the top of the opening,
and close cover.
50
Robert Bosch GmbH