4700 Refrigerated Sampler Service Guide
Section 5 Electrical Troubleshooting and Diagnostics
5-4
If the sampler displays
PUMP FAILURE
or
BAD ON/OFF RATIO
,
turn off the sampler by pressing the Off button. Then, refer to
Section 1.4.1 and perform a pump inspection. Clear any obstruc-
tions from the pump housing and pump tube, verify that the
pump rotor turns, then perform the
TEST PUMP
diagnostic
again. If you don’t find obstructions to pump rotor movement but
the pump still fails, contact your authorized Isco service facility
or the Teledyne Isco factory.
5.1.6 Test Distributor
The
TEST DISTRIBUTOR
diagnostic calibrates the sampler’s dis-
tributor alignment. You specify the bottle position to which the
sampler should move the arm. You can then verify the correct
positioning of the arm.
Note
This test is not applicable for samplers configured for operation
with a single 20 liter bottle.
To run the test:
1. Remove the discharge tube from the distributor arm.
This removes tension from the arm for better visual verifi-
cation.
Figure 5-1 Distributor arm (A), discharge tube (B), and stop (C)
2. At the standby screen, enter the code
82253
(TABLE) to
activate the Calibrate button.
3. Go to the
RUN DIAGNOSTICS
menu as usual and select the
TEST DISTRIBUTOR
option.
4. Open the refrigerated compartment and manually move
the distributor arm to its “home” position against the front
of the stop on the distributor module (Figure 5-2).
A
B
C
SELECT DIAG: (<-->)
TEST DISTRIBUTOR
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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