4700 Refrigerated Sampler Service Guide
Section 1 Introduction and General Guidelines
1-14
1.7 Major Assembly
Removal and
Replacement
Teledyne Isco designed the sampler for easy field replacement of
its sub-assemblies. This expedites the repair and saves shipping
costs. These sub-assembly modules should be replaced by trained
personnel.
The sub-assemblies are:
• Pump Module (Section 2.2)
• Distributor Module (Section 2.7)
• Refrigeration Module (Section 3.4.4)
• Control Panel Module with Main CPU board
(Section 4.4)
• Power Supply (Section 4.5)
The removal and replacement instructions include general steps
that apply to all modules, and detailed instructions for each
module.
Before proceeding with the detailed instructions in the following
sections, familiarize yourself with these general steps for the
removal and replacement of a module.
To remove a module:
1. Remove the mounting screws.
2. Carefully lift the module away from the refrigerator body.
3. Disconnect the wiring connectors.
To replace a module:
1. Ensure that the gasket seal is in place. The gasket surface
must be smooth, clean, and free of nicks, cracks, etc. If any
imperfections are visible, replace the seal.
2. Reconnect the wiring connectors, using care to correctly
pair the connectors and to correctly align the keys and
pins.
3. Ensuring that no wires are caught between the module
and mounting surface, align the module over the mounting
holes and secure it with the mounting screws.
4. Apply AC power and turn on the sampler.
5. After replacement, test the new module using the appro-
priate diagnostic tests in Section 5.1.
1.7.1 Module Reassembly
It may become necessary to service or replace module compo-
nents. When rebuilding/reassembling a module, always observe
the special instructions provided for each assembly, in order to
preserve the life and integrity of each component.
CAUTION
When
reinstalling
all self-tapping screws, avoid destroying the
plastic threads. First seat each screw in its hole and, without
pressing down, rotate the screw counter-clockwise until it falls
into its thread groove with a "click." Then tighten the screw.
This precaution is not necessary with new, unthreaded holes.
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