2-128
Service Manual
5026
Operator panel service check
One or more operator panel buttons fail
Operator panel display blank, five
beeps
, and LED is off
Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part
of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits
five
beeps
, and then sticks in a continuous pattern until the printer is turned off.
Operator panel display blank, five
beeps
, LED on
Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part
of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits
five
beeps
, and then sticks in a continuous pattern until the printer is turned off.
Step
Questions / actions
Yes
No
1
Run the Button Test. See
“Button Test” on
page 3-12
in Diagnostics mode.
Did any of the buttons fail the test?
Replace the operator panel
assembly. See
“Operator
panel assembly removal”
on page 4-24
.
Go to step 2.
2
Disconnect the operator panel assembly
cable from JOPP1 on the system board, and
then measure the voltage on pin 6 and
ground.
Does the voltage measure approximately
+3.3 V dc?
Replace the operator panel
assembly. See
“Operator
panel assembly removal”
on page 4-24
. If this does
not fix the problem, replace
the top cover access
assembly. See
“Top
access cover assembly
removal” on page 4-40
.
Replace the system board.
See
“System board
removal” on page 4-139
.
Step
Questions / actions
Yes
No
1
Is the operator panel assembly cable properly
installed at system board JOPP1 and at the
operator panel assembly?
Go to step 2.
Reinstall the cable.
2
Measure the voltage between JOPP1 pin 2
and ground on the system board.
Is the voltage approxi5 V dc?
Go to step 3.
Replace the system board.
See
“System board
removal” on page 4-139
.
3
Check continuity of the operator panel
assembly cable.
Is there continuity?
Replace the operator panel
assembly. See
“Operator
panel assembly removal”
on page 4-24
.
Replace the top cover
access assembly. See
“Top access cover
assembly removal” on
page 4-40
.
Step
Questions / actions
Yes
No
1
Check for ground between JOPP1 pin 4 and
ground.
Is the voltage approximately 0 V dc?
Replace the operator panel
assembly. See
“Operator
panel assembly removal”
on page 4-24
.
Go to step 2.
2
Check the operator panel assembly cable.
Is the cable damaged?
Replace the top cover
access assembly. See
“Top access cover
assembly removal” on
page 4-40
.
Replace the system board.
See
“System board
removal” on page 4-139
.
Summary of Contents for C734 series
Page 13: ...Notices and safety information xiii 5026 ...
Page 14: ...xiv Service Manual 5026 ...
Page 170: ...2 136 Service Manual 5026 ...
Page 288: ...4 72 Service Manual 5026 12 Remove the seven screws M securing the EP drive ...
Page 339: ...Repair information 4 123 5026 13 Remove the three printhead mounting screws D ...
Page 395: ...Connector locations 5 1 5026 5 Connector locations Locations ...
Page 408: ...7 2 Service Manual 5026 Assembly 1 Covers ...
Page 410: ...7 4 Service Manual 5026 Assembly 2 Front ...
Page 412: ...7 6 Service Manual 5026 Assembly 3 Right 1 2 3 4 5 6 ...
Page 414: ...7 8 Service Manual 5026 Assembly 4 Rear ...
Page 424: ...7 18 Service Manual 5026 Assembly 11 Options and features ...
Page 426: ...7 20 Service Manual 5026 ...
Page 436: ...I 10 Service Manual 5026 ...