Test 'Rom; Test Display; Test Keypad - Teledyne 5800 Installation And Operation Manual

Isco 5800 Refrigerated Sampler
Section 5 Maintenance

5.2.2 Test 'ROM'

SELECT DIAG: (<-->)
TEST 'ROM'
...TESTING 'ROM'
'ROM' PASSED

5.2.3 Test Display

SELECT DIAG: (<-->)
TEST DISPLAY
ABCDEFGHIJKLMNOPQRST
ABCDEFGHIJKLMNOPQRST

5.2.4 Test Keypad

SELECT DIAG: (<-->)
TEST KEYPAD
PRESS ANY KEY
WATCH DISPLAY
5-8
The TEST 'ROM' diagnostic tests the sampler's Read-Only
Memory which holds the sampler software. It calculates a
checksum total of the data held in this memory and compares it
with a known value. If the checksum matches, the ROM test
passes.
To run the test:
1. Select the TEST 'ROM' option and press Enter.
2. Wait for the sampler to complete the test.
3. When finished, the sampler displays the test results.
If the sampler reports 'ROM' FAILED contact your authorized Isco
service facility or the Teledyne Isco factory. For these samplers,
the test will report NO CHECKSUM. This result does not indicate
a pass or fail state, only that the ROM test is not valid for this
particular sampler.
The TEST DISPLAY diagnostic tests the sampler's LCD display. It
cycles blocks of pixels on and off, then displays characters on the
screen. There is no pass or fail message. The technician must
watch the display to determine if it is faulty.
To run the test:
1. Select the TEST DISPLAY option and press Enter.
2. The sampler marches solid boxes across the display,
followed by characters. Observe the display. Evidence of a
faulty display may include:
· pixels that never turn on
· pixels that always stay on
· garbled text
· poor contrast.
If any of these or other faulty display conditions exist, contact
your authorized Isco service facility or the Teledyne Isco factory.
The TEST KEYPAD diagnostic tests the sampler's keypad. While
the test is active, the display reports the button name of any
button you press. There is no pass or fail message. The
technician must watch the display to determine if the sampler
reports the correct button when it is pressed.
To run the test:
1. Select the TEST KEYPAD option and press Enter.
2. The sampler displays the test instructions.