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PUMPING...
PUMPING...
ON/OFF RATIO = ___
PURGING...
PURGING...
ON/OFF RATIO = ___
5.2.6 Test Distributor
SELECT DIAG: (<-->)
TEST DISTRIBUTOR
GO TO BOTTLE ___
(1-max)
MOVING TO BOTTLE ___
NOW AT BOTTLE ___
GO TO BOTTLE ___
(1-max)
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.
If the sampler displays PUMP FAILURE or BAD ON/OFF RATIO,
turn off the sampler by pressing the Off button. Then, refer to
section 5.1.1 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,
contact your authorized Isco service facility or the Teledyne Isco
factory.
The TEST DISTRIBUTOR diagnostic tests the sampler's dis-
tributor assembly. You specify the bottle position to which the
sampler should move the arm. You can then verify the correct
positioning of the arm.
Note that this test is not applicable for samplers configured for
operation with a single bottle.
To run the test:
1. Select the TEST DISTRIBUTOR option and press Enter.
2. Enter the bottle number to which the sampler should move
the arm. Press Enter and the distributor will run.
3. The sampler reports the new distributor arm position. Ver-
ify that the arm is aligned over the correct bottle. If the
arm is not aligned over the bottle, the distributor requires
calibration. Contact your authorized Isco service facility or
the Teledyne Isco factory.
4. The sampler then asks for the next bottle position. Enter a
bottle number and press Enter. Or, press the Stop button to
exit the test.
If the sampler displays DISTRIBUTOR JAMMED, DISTRIBUTOR
ERROR, SLOT CODE ERROR, DISK ERROR, or BELT TOO
LOOSE, verify that the arm movement is not obstructed. Clear
any obstructions such as bottles not fully seated in the rack or an
incorrectly installed discharge tube, then perform the TEST DIS-
TRIBUTOR diagnostic again from step 1. If you don't find obstruc-
tions to the distributor arm movement, contact your authorized
Isco service facility or the Teledyne Isco factory.
Isco 4700 Refrigerated Sampler
Section 5 Maintenance
5-9
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