1. DIAGNOSIS TOOLS “ALL ROUND TESTER” 1.1 ALL ROUND TESTER 1.1.2 NOTES ON CORRECT USE The ART is protected against battery polarity inversion, and positive or negative overvoltages of momentary duration (1 msec). Do not attempt to connect the ART to non-dedicated sockets, and do not use trailing connections or extension ca- bles. The display is permanently backlit to ensure readability in any ambient light conditions. A knob on the side allows adjustment of the contrast. If the display appears blank, the contrast control knob may be in a po- sition that renders the characters invisible.
The tester operates correctly at temperatures between 0 and 40 °C, and should be switched off every 30 minutes to max- imise its service life. Before disconnecting the ART from the diagnostic socket, turn the starter key to the “ O ” (OFF) position.. 1.1.3 DESCRIPTION OF THE TESTER 4 5 1 3 2 F0057700 The ART includes: 1 - A backlit liquid crystal display 2 - An alphanumeric keypad with 16 keys 3 - Display contrast control knob. Used to adjust the contrast. If the display appears blank, the contrast control knob may be in a position that renders the characters invisible. 4 - Parallel port (used to connect the ART to systems with electronic control units that do not have microprocessors).
5 - Serial port (used to connect the ART to systems with electronic control units incorporating microprocessors). 20-2