Advanced Instruments 4D3 - Page 59

59
The Advanced
®
3D3/4D3 Service Manual
35. “TE Driver Failure”
“Thermoelectrics
Driver Failure”
“Thermoelectrics
System Failure”
36. “Test Cancelled”
37. “Test Time-out Error”
38. “Underrange, Use Low
Range”
“Result <1400, Use
Low Range”
(3D3 only)
39. Wrong instrument
model displayed
The thermoelectric driver may not be
functioning properly.
The STOP button was pressed during
the test.
The test has taken too long to complete.
The sample tested in the high range set-
ting was under 1400 mOsm.
Processor board 3D3620/4D3620 option
switch SW1.
1. Use the A/D test to check the cooling
assembly.
2. Check Q1B driver.
3. Check application board.
Retest with a fresh sample.
1. Make sure the sample tube is not empty,
and make sure the sample is not too vis-
cous.
2. Make sure there is heat transfer fluid in
the cooling well.
3. Check the stir amplitude.
4. Check the sample/probe block bin setting.
5. Check the cooling assembly well.
6. Use A/D test to verify cooling system
function.
Retest the sample in the low range setting.
Reset switch SW1 (see Option Switch Setup
Table).
Symptom Explanation Suggested Action