CH. 7: GETTING STARTED 06 Apr 2000 PAGE 35
GFK-1819
CHAPTER 7: GETTING STARTED
7.1 Self-Test
Power up the unit with the UP and ENTER keys pressed at the same time. The unit enters a self-test
mode. The self-test consists of the following four checks:
7.1.1 Contrast Band
This test allows the user to set the lower and upper limits of contrast. Adjust the lower limit using the UP or DOWN
key and press Enter when done. Do the same for the upper limit.
WARNING: - Changes to the lower or upper limits may allow the user to set the contrast to a
setting where the display may appear blank. It is recommended that the factory setting are used
(Min 8A, Max FE).
7.1.2 Display Test
The display test continuously blinks all pixels on (black) to off. Look for any pixels stuck on or off. Exit
this test by pressing and holding any key for approximately two seconds.
7.1.3 Keyboard Test
As each key is pressed, an indication *** appears above that key. In the case of units with a numeric
keypad, press the key and a message appears indicating the key press. Check for keys indicating
multiple presses or not reporting presses. Exit this test by pressing and holding any key for
approximately two seconds.
7.1.4 RAM Test
Test either segment 0000 or segment 1000 (on the TIU100/110) of the RAM. The segment 1000 test
performs a base 3 repeating test. This test detects shorted address lines and damaged memory bits.
The segment 0000 test performs a Read-Modify-Write test on each byte of RAM, detecting damaged
memory bits. Exit this test by selecting DONE.
7.1.5 Serial Loop-back Tests
Tests the PC port and the Serial Port in each of it’s three modes for serial loop-back. Pre-made plugs are
required to link the pins of a particular port. This takes the following form:
Table 7.1 Loop-back Test Plugs
Port Tested Product Type of Connector Pins to Short
PC (J2) TIU100/110 Pin male D link connector pin 2 to pin 3
RS-232 (J3) TIU100/110 13-pin phoenix connection pin 6 to pin 8
RS-422/485 (J3) TIU100/110 13-pin phoenix connection pin 2 to pin 4 and pin 3
to pin 5.
Current Loop TIU100/110 13-pin phoenix connection pin 1 to 9, pin 10 to 11
and pin 12 to 7
PC TIU050/101/102/1
03/112/113/20X Pin male D link connector pin 2 to pin 3
RS-232 TIU050/101/102/1
03/112/113/20X 8-pin phoenix connection Pin 5 to pin 7
RS-422/485 TIU050/101/102/1
03/112/113/20X 8-pin phoenix connection Pin 1 to pin 3, Pin 2 to
pin 4
NOTE: current loop in not installed on standard models, as such a standard model will fail the
current loop-back test. Current Loop is not an option on the TIU050/20X.
After starting the test, the OK counter begins to count up. Exit this test by selecting DONE.