4-4 800TCU User’s Guide 800gench4.fm Rev. A
Maintenance Corrective Maintenance
4.4.3 Visual Indicators
Use the visual indicators, particularly the alphanumeric display, as a troubleshooting aid.
Note any indications which vary from those which would normally be expected. The
STATUS display gives error messages wherever possible. They may be useful in
determining a failure mode.
4.4.4 Power Circuits
Verify that power supply(s) are operating to their specification(s). Verify that the primary
power fuse has not blown and that primary power is present.
4.4.5 Replacing Components
It is imperative that the IC’s are replaced with exactlythe same type of component. Do not
guess in this area. Use the parts lists to find the exact IC part number if there is a question.
Be sure not to bend under the IC legs when replacing them.
When replacing soldered in components use a low temperature iron and be careful not to
disturb the etch. Use a resin-core flux and clean the soldered joints carefully with alcohol.
Do not allow the cleaner to penetrate the pots or switches.
Do not remove or insert circuit board assemblies while power is applied.
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