Buzzer Operation And Error Conditions; Buzzer Operation; Error Conditions - Epson LQ 1050 - B/W Dot-matrix Printer Technical Manual

1.8 BUZZER OPERATION AND ERROR CONDITIONS

This section describes the buzzer operation and error conditions of the printer.

1.8.1 Buzzer Operation

The buzzer beeps as follows:
When a BEL code is sent to the printer, the buzzer sounds for 0.1 second.
When the following error has occured:
Carriage Trouble . . . . . . . . . . . . . . . . . . . . .
Paper End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Beeps 20 times, pausing briefly after every 4 beeps.
Abnormal Voltage . . . . . . . . . . . . . . . . . . . Beeps 5 times, pausing every beep.
RAM Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Short circuited printhead
drive transistor . . . . . . . . . . . . . . . . . . . . . . . . Beeps 10 times, pausing after every beep.
Recognition of the control panel operation
Beeps once in the following cases:
Self print mode
Hexadecimal dump mode
Print mode setting
Proportional space alternation
Beeps once when old proportional space is selected and twice new one is selected.
The printer enters an error state and sets the ERROR signal LOW and BUSY signal HIGH to prohibit
reception of data when any of the following states occurs.
The carriage home signal is not detected after the printer mechanism has been initialized (carriage
error).
The carriage home position is detected during printing (carriage error).
The printer is set OFF LINE using the ON LINE switch.
An internal DC voltage drop is detected (abnormal voltage is detected).
During initialization, an error is detected by a READ/WRITE check of the RAM in the control circuit.
A printhead drive transistor is shorted.
Interface signal PE is also set HIGH in addition to the above error sequence when any of the following
states occurs.
The printhead is moved outside of the printable area by a forms override function (paper end state).
The paper end state continues after the cut sheet feeder mode has been set and paper loading has
been completed (paper end state).
Beeps 6 times, pausing briefly after 3rd beep.
Beeps 6 to 10 times, pausing briefly after every 2 beeps. The beeps
warn which RAM is incorrect as follows:
6 times . . . . . . . . Internal RAM (CPU)
8 times . . . . . . . . Lower Address RAM (IC)
10 times . . . . . Upper Address RAM (IC)
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