38
Display/Printer Test Advanced
™
Osmometer 3250/Cryoscope 4250 Service Manual
Display/Printer Test
1. Turn on the instrument. If there is a Supervisor/Operator keyswitch, turn it to the
Supervisor position (if required).
2. Press TEST.
3. Press < or > to select Display/Printer Test, and then press START twice.
A continuous string of characters and numbers should scroll across the display, and a
single string of the same characters and numbers will be sent to the printer
If not, check your connections and try again. If you continue to have a problem and the
instrument is working otherwise, the printer or display may need to be replaced (see
Replacement Instructions(?) for additional information).
4. Press STOP twice to end the test and exit the Test menu.
Beeper Test
Note This test will only function if Power On Diagnostics has been completed.
1. Turn on the instrument. If there is a Supervisor/Operator keyswitch, turn it to the
Supervisor position (if required).
2. Press TEST.
3. Press < or > to select Beeper Test, and then press START and < to activate the continuous
internal beeper.
4. If you do not hear the beeper and the instrument is working otherwise, the application
board may need to be replaced (see Replacement Instructions for additional information).
5. Press STOP twice to end the test and exit the Test menu.
Keypad Test
1. Turn on the instrument. If there is a Supervisor/Operator keyswitch, turn it to the
Supervisor position (if required).
2. Press TEST.
3. Press < or > to select Keypad Test, and then press START to activate the keypad test.
Each key pressed should respond on the display with the key name, and activate the
corresponding LED, if present.
If any keys or LEDs do not respond, check the harness connections and repeat the test.
Otherwise, the keypad or application board may need to be replaced (see Replacement
Parts for additional information).
4. Press STOP twice to end the test, and STOP again to exit the Test menu.
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