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Isco 4700 Refrigerated Sampler
Section 5 Maintenance
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
ENTER
5.2.5 Test Pump
SELECT DIAG: (<-->)
TEST PUMP
5-8
English-language only samplers do not include the known value.
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, fol-
lowed 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 tech-
nician 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.
3. Press any button on the keypad. For example, press the
Enter button. The display reports ENTER. The test runs
for 20 attempts, then reverts to the SELECT DIAG menu.
If the display does not report the button name when you press it,
the keypad could be faulty. Contact your authorized Isco service
facility or the Teledyne Isco factory.
The TEST PUMP diagnostic tests the sampler's pump assembly.
The sampler operates the pump in each direction and reports an
ON/OFF ratio. This ratio is an indication of the pump's
mechanical and electronic performance.
To run the test:
1. Select the TEST PUMP option and press Enter. The sam-
pler starts the test and continues without intervention. To
cancel the test you can press the Stop button.
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