Service manual

Rev. B Features and General Specifications 1-21
TM-U200 Series (Type B) Service Manual
Confidential
See Chapter 4 for instructions on running a self-test.
Error Processing
Printer Operation When an Error Occurs
The printer executes the following operations upon detecting an error:
Serial interface
❏
All mechanical operations stop.
❏
DTR signal is set to MARK (only when DTR/DSR is selected and DIP switch 1-8 is off).
❏
The ERROR LED blinks.
❏
XOFF is transmitted when XON/XOFF control is selected (only when DIP switch 1-8 is off).
Parallel interface
❏
All mechanical operations stop.
❏
The BUSY signal is set to HIGH (only when DIP switch 1-8 is off).
❏
The ERROR LED blinks.
❏
Fault
signal is set to LOW.
Data Receive Error
If one of the following errors occurs, the printer prints “?” or ignores the data, depending on the
setting of DIP switch 1-1:
❏
Parity error
❏
Framing error
❏
Overrun error.
Buffer Full Printing
When subsequent data is received after the printer processes one line of data in the print buffer,
the printer automatically prints the processed data and feeds the paper one line.
Detectors and Printing
When the printer detects a paper near-end, it stops or continues printing, depending on the
ESC
c 4
command setting. The roll paper detector always halts printing when there is no paper.