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2-2 Service Manual
4227-X00
Error Indication Table
The following table describes the service check entries for the printer
error indication codes.
When an error indication changes after you have entered a service
check, you have an intermittent problem. If this occurs, leave the
servicecheckandgoto“Symptom Table” on page 2-4.
Display Indication Description / Action
631 Machine Check
Display RAM Error
Display RAM Read/Write Error. This error
is detected only during POST. Replace the
operator panel.
632 Machine Check
System RAM Error
System RAM Read/Write Error.
Replace the main logic board and
adjust the
“Bidirectional Print
Adjustment” on page 4-4
.Checkthe
“Printhead-to-Platen Gap Adjustment”
on page 4-2
.
633 Machine Check
Timer Interrupt Error
Timer Interrupt Controller Error. Replace
the main logic board and adjust the
“Bidirectional Print Adjustment” on
page 4-4
.Checkthe“Printhead-to-
Platen Gap Adjustment” on page 4-2
.
636 Machine Check
NOVRAM Error
Non-Volatile Memory Read/Write Error.
Replace the main logic board and adjust
the
“Bidirectional Print Adjustment” on
page 4-4
.Checkthe“Printhead-to-
Platen Gap Adjustment” on page 4-2
.
637 Machine Check
CA Drive Error
Home Timeout Error. Go to the
“Carrier
Drive Service Check” on page 2-14
.
638 Machine Check
CA Drive Error
Carrier Drive Error.
No emitter pulse detected. Go to the
“Carrier Drive Service Check” on page
2-14
.
639 Machine Check
CA Drive Error
Carrier Drive Error.
Carrier positioning error. Go to the
“Carrier
Drive Service Check” on page 2-14
.
63B Machine Check
Key Scan Error
Button Scanning Error.
Go to the
“Operator Panel Service
Check” on page 2-19
.