IBM 4247 Maintenance Information page 145

Table 18. Error Messages for Models 001, 002, and 003 (continued)
Message
220 SERIAL DSR ERROR
MODEL 003 TWINAX CODE
SEE USER'S GUIDE
221 SERIAL OVERFLOW ERROR
MODEL 003 TWINAX CODE
SEE USER'S GUIDE
A89, A8C, or A97
JUMPER AND KEYS
Description
A remote connection serial interface error
condition was detected. The Data Set
Ready or Data Carrier Detect signal was
not sensed.
A serial input buffer overflow error
condition was detected. Data has been
lost.
Application errors.
Manufacturing use only.
Action
See "MAP 0120: Parallel or Serial
Attachment, Model A00 and Model 003" on
page 33.
1. Press stop to clear the message.
2. Increase the buffer size and/or:
3. Check the SERIAL PACING
PROTOCOL value set in the printer
configuration against the hosts pacing
protocol.
4. Restart the print job.
Press Stop, then Start.
1. Remove the jumper from the bottom of
the operator panel.
2. Install a new operator panel. See
"Operator Panel" on page 355.
3. Install a new operator panel cable.
4. Install a new logic board. See "Logic
Board - Models 001 and 002" on
page 378. Or "Logic Board - Model
003" on page 366.
Chapter 1. Diagnosing Problems
145