4700 Refrigerated Sampler Service Guide
Section 5 Electrical Troubleshooting and Diagnostics
5-6
5.1.7 Test Flow Meter Port
The
TEST FLOWMETER PORT
diagnostic tests the sampler’s
ability to send event marks, and receive an enable pin signal and
flow pacing pulses.
Note
This diagnostic routine is not for field use. This test requires a
test plug which is inserted into the External Device connector.
If you have checked all the connections with the external flow
meter and still suspect a fault with the event mark or flow pacing
signals, contact your authorized Isco service facility or the
Teledyne Isco factory. They will be able to assist you with
obtaining a test plug or making the necessary jumper connec-
tions to run the test.
To run the test:
1. Select the
TEST FLOWMETER PORT
option and press
Enter.
2. Insert a Flow Meter Port Test Plug into the Flow Meter
connector.
3. The sampler tests the send and receive circuits for the
event marks, sampler enable pin (inhibit), and flow pulses.
If the sampler displays
FAILED: EM->FP
or
FAILED: INHIBIT
,
verify that test plug is correctly inserted. Then, perform the
TEST FLOWMETER PORT
diagnostic again from step 1. If the
test still fails, contact your authorized Isco service facility or the
Teledyne Isco factory.
5.1.8 Refrig Temperature
The
REFRIG TEMPERATURE
diagnostic displays the temper-
ature of the refrigerated compartment. When this test is started,
the sampler should display the temperature until you press the
Stop or Enter button. There is no pass or fail. This test simply
provides continuous temperature monitoring.
If the screen displays an asterisk (*) or inaccurate temperature
reading, the temperature sensor cable may be malfunctioning.
See Section 3.3.1 for replacement procedures.
To display the refrigerator temperature:
1. Select the
REFRIG TEMPERATURE
option and press Enter.
2. The display shows the temperature until you press the
Stop or Enter button.
5.1.9 PCB Temperature
The
TEST PCB TEMPERATURE
diagnostic displays the temper-
ature of the Main CPU Printed Circuit Board (PCB). When this
test is started, the sampler will display the temperature until
you press the Stop or Enter button.
SELECT DIAG: (<-->)
TEST FLOWMETER PORT
INSTALL TEST PLUG
PRESS
WHEN READY!
FLOWMETER PORT TEST:
...TESTING
SELECT DIAG: (<-->)
REFRIG TEMPERATURE
REFRIG TEMPERATURE:
AIR=__C EVAP=__C
Summary of Contents for 4700
Page 2: ......
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 ...
Page 131: ...4700 Refrigerated Sampler Appendix B Replacement Parts List B 3 ...
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