Of2 Control Panel Rap - Xerox DocuPrint C55 Service Manual

OF2 CONTROL PANEL RAP
This RAP is used when the Control Panel
Message Display, LEDs, or Buttons do not
work.
INITIAL ACTION
Switch the power off wait 10 seconds and
switch the power on and recheck for the fault.
Enter IOT normal diagnostics (Menu [3],
Enter [7] + Power On) and check the
operation of the Control Panel. If the Control
Panel works OK in diagnostics, refer to BSD 6
and check the PCU to ESS connectors
CN104. If the connections are OK, replace the
ESS PWB.
PROCEDURE
Classify the problem into one of the following
categories, then go to the
subsection of the RAP.
OF2.1 The Message Display top row consists
n
of ' s. The bottom row is blank.
OF2.2 The Message Display is blank (no *
during IOT Boot).
OF2.3 The message display is flickering off
and on, or displaying
characters.
OF2.4 Message display works OK, LEDs do
not work correctly.
OF2.5 Message display works OK, Switches
do not work correctly.
OF2.6 * Circles Continuously.
OF2.7 Rebooting message never clears.
OTHER FAULTS RAPs
OF2
OF2.1 The Message
consists of
blank.
PROCEDURE
Switch the power off wait 10 seconds and
switch the power on, while listening to the IOT.
The IOT runs (boots up) when the printer is
switched on.
Y N
Refer to BSD 6 and check the RES signal
(CN104-8) for a short to ground.
Refer to BSD 2.1 and check the D3 signal
(CN103-25) for a short to ground.
It the wiring is OK, replace the PCU PWB.
If the problem still exists, replace the
Control Panel PWB.
appropriate
Refer to BSD 2.1 and check the following
signals:
• CN103-22 Read/Write for an open.
• CN103-23 Register Select for an open or a
short to ground.
• CN103-24 Display Enable for an open or a
short to ground.
random
• CN103-25 Data 3 for an open.
• CN103-26 Data 2 for an open.
• Refer to BSD 10.2 and check CN103-18
Strobe 2 for a short to ground.
• Refer to BSD 10.4 and check CN103-19
Strobe 1 for a short to ground.
If all appear OK, replace the Control Panel PWB.
If the problem still exists, replace the PCU PWB.
Display top row OF2.2 The Message Display is blank (no *
n
' s. The bottom row is
PROCEDURE
Switch the power off wait 10 seconds and
switch the power on, while listening to the IOT.
The IOT runs (boots up) when the printer is
switched on.
Y
Refer to BSD 2.1 and check the following
signals:
• CN103-22 Read/Write for a short to
• CN103-26 Data 2 for a short to ground.
• CN103-27 Data 1 for an open.
• CN103-28 Data 0 for an open.
Refer to BSD 6 and check the following
signals:
• CN104-1 STS (Status) for an open or a
• CN104-5 SRDY (Status Ready) for an
If all appear OK, replace the Control Panel PWB.
If the problem still exists, replace the PCU PWB.
2/99
2-32
during IOT Boot).
N
Set up the meter to measure +5 VDC.
Measure between CN310-10 (+) and
CN310-11 (− ).
The meter indicates +5 VDC.
Y N
Go to OF1.1 +5 VDC RAP.
Refer to BSD 2.1 and check the +5 VDC
CN310-11 and DC COM CN310-10 from
the Connector PWB to the Control Panel.
If OK, replace the Control Panel PWB.
ground.
short to ground.
open.
DocuPrint C55/C55mp/[NC60]