4700 Refrigerated Sampler Service Guide
Section 5 Electrical Troubleshooting and Diagnostics
5-3
·
poor contrast
If any of these or other faulty display conditions exist, contact
your authorized Isco service facility or the Teledyne Isco factory.
5.1.4 Test Keypad
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 buttons on the keypad in any order; the display
should report the button name as it is pressed. For exam-
ple, press the Enter button. The display reports
ENTER
.
After 20 keystrokes, the sampler reverts to the
SELECT
DIAG
menu.
Note
Pressing the red Stop button twice consecutively will exit the
test regardless of the number of strokes.
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.
5.1.5 Test Pump
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.
2. The sampler displays the On/Off ratio. To pass, the number
must be between 0.8 and 1.25. The test continues by oper-
ating the pump in reverse (purge).
3. The sampler displays the On/Off ratio. To pass, the number
must be between 0.8 and 1.25.
SELECT DIAG: (<-->)
TEST KEYPAD
PRESS ANY KEY
WATCH DISPLAY
ENTER
SELECT DIAG: (<-->)
TEST PUMP
PUMPING...
PUMPING...
ON/OFF RATIO = ___
PURGING...
PURGING...
ON/OFF RATIO = ___
Summary of Contents for 4700
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Page 6: ...Isco 4700 Refrigerated Sampler Service Guide Safety iv ...
Page 12: ...4700 Refrigerated Sampler Service Guide Table of Contents x ...
Page 30: ...4700 Refrigerated Sampler Service Guide Section 1 Introduction and General Guidelines 1 18 ...
Page 60: ...4700 Refrigerated Sampler Service Guide Section 2 Sample Delivery System 2 30 ...
Page 108: ...4700 Refrigerated Sampler Service Guide Section 4 CPU and Power Supply 4 26 ...
Page 124: ...4700 Refrigerated Sampler Service Guide Appendix A Electrical Diagrams A 2 ...
Page 126: ...4700 Refrigerated Sampler Electrical Wiring A 4 Figure A 3 4700 wiring diagram 230V ...
Page 128: ...4700 Refrigerated Sampler Electrical Wiring A 6 Figure A 5 4700 CPU schematic diagram ...
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