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3700 Portable Samplers
Section 6 Servicing
6.1 Controller
6.1.1 If Serious Problems
Occur
6.1.2 Processor Servicing
This section presents servicing information for the 3700 Portable
Samplers in the following sections:
• Servicing the controller
• Control box removal
• Removal of the distributor and pump-gear cases
• General care of CMOS circuitry
• Circuit description of the electronic circuitry
• Sample event cycle
Included is an illustrated Replacement Parts List and a list of
available accessories available for the 3700 Sampler. For infor-
mation on servicing and replacing power sources, consult the
Teledyne Isco Power Products Guide, shipped with this manual.
The electronic circuitry of the 3700 Sampler is solid-state and its
reliability is high. If the unit should fail to operate properly,
items such as a broken or intermittent connection in the power
cable or wiring harness should be suspected.
To view schematic drawings of the circuit boards discussed in
this section, first find the serial number on your controller, then
go to our web site, www.isco.com. Go to Training and Support
and select Product Support. Click Automatic Wastewater Sam-
plers. In the left margin, click Schematics. Enter the serial
number of your instrument, then click Get Schematics to view a
list of PDF files that contain the available schematics.
If you suspect an electronic problem, Teledyne Isco strongly rec-
o m m e n d s c a l l i n g t h e Te l e d y n e I s c o Te c h n i c a l S e r v i c e
Department at (800) 775-2965, or (402) 464-0231 outside the
U.S.A., Canada, and Mexico. The Service department will provide
information on how to return the sampler or subassemblies to
the factory for service. For example, you can remove the pump
assembly, distributor assembly, or control box and return them
separately for servicing.
The Teledyne Isco Service department has trained technicians and
specially designed equipment necessary for timely, efficient repair
of the sampler. If you wish to attempt repairs, the Teledyne Isco
Technical Service Department is available to provide advice on
servicing.
When you attempt to isolate problems within the unit, assume
that the CPU and memory are working properly until you have
eliminated the possible causes listed in Section 6.3.
6-1
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