Epson SQ-B50/2550 Technical Manual page 242

REV.-A
30: Pump motor drive
Select this mode to drive the pump motor.
When this mode is entered, the LCD panel displays the following menu for selecting the carriage speed.
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LF---*CW(CL) FF---*CCW(OP)
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LF: drive pump motor CW(Cap close)
FF: drive pump motor CCW(Cap open)
The pump motor is driven while the panel switches are pressed.
To exit this mode, press the ON-LINE switch.
Note that the valve plunger is always open in this mode.
31: All head ON/OFF
When this mode is selected, IC6B (GA) outputs head data at a constant rate.
Using this mode, the waveforms from IC6B and IC5C to 7C in the head drive circuit can be easily
observed.
To exit this mode, press the ON-LINE switch.
Note that the PTS signal from IC4B is not used in this mode. The head drive timing is performed by
the CPU internally.
32: EEPROM check
Select this mode to check the EEPROM on the control panel unit.
This mode performs two tests: a read/write check and an address check.
This EEPROM stores very important data for the mechanism.
In this test, ifthe CPU does not detect an error in the EEPROM, the current data is restored to the EEPROM,
so do not turn the printer power off until the test is completely finished.
33: 146H timer check
Select this mode to check the 146 hour hardware timer.
When this mode is selected, the LCD displays the following:
LF:Rst. TIMER=xxxxxx
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LF : This key resets the timer.
xxxxx : Current state of timer
OVER: over 146h
WITHIN: within 146h
If the timer indicate 'over 146h', please press the LF key to reset the timer.
If LCD screen changes from 'OVER' to 'WITHIN' then the timer circuit is normal.
In this mode, CPU pin 42 can be switched between HIGH and LOW from the control panel, so operation
of the timer reset circuit can be easily checked.
To exit this mode, press the ON-LINE switch.
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