Xerox Phaser 840 Service Manual page 267

ACTION:
Verify Good Board Con-
nection
2.
Reseat main board to
insure good contacts
and power up printer
(repeat one time if first
try is unsuccessful)
3.
Remove main board
and reseat the code
DIMM and power up
printer (repeat one time
if first try is
unsuccessful)
Use the Electronics
Troubleshooting Guide
4.
Power printer on and
observe when it fails.
LOOK FOR:
Check the one that applies:
__Failure corrected due to
reseat, check appropriate
box in next column
__Same failure still exists after
trying Actions 2 and 3, go to
Action 4
Check the one that applies:
__4A. Printer is immediately
dead when power switch is
turned on.
__4B. Failure occurs during
printer power on sequence
(hang or error message).
__4C. Failure occurs after
power on sequence, front
panel message present
(other than the Tektronix
logo), print quality problem
occurs due to electronics,
etc.
WHAT NEXT:
Check the one that applies:
2. If error condition is gone
after reseat, check printer's
history
I If previous fix was due to a
reseat of this board,
replace main board.
I If no history of a previous
reseat, record fix as a
"main board reseat"
3. If error condition is gone
after reseat, check printer's
history.
I If previous fix was due to a
DIMM reseat of this board,
replace code DIMM
I If no history of a previous
reseat, record fix as a
"code DIMM reseat"
Go to Action 4.
Check the one that applies:
__4A/4B. Refer to the
following section in the
electronics troubleshooting
guide: "Failures Occurring
During Power On
Sequence." Record the
following:
Step (I, II, ...)
Clue (1, 2, ...)
Root Cause (A, B, ...)
Action (a, b, ...)
__4C. Refer to the following
section in the electronics
troubleshooting guide:
"Failures Occurring After
Power On Sequence Is
Complete." Record the
following:
Step (I, II, ...)
Clue (1, 2, ...)
Root Cause (A, B, ...)
Action (a, b, ...)
Go to Action 5.
Appendix 251