Orban 8300J, Operating Manual

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OPTIMOD-FM DIGITAL TROUBLESHOOTING
5-13
The same holds true if the above polarities are reversed. Because the characteristics
of the 8300's circuitry are essentially independent of IC opamp characteristics, an
opamp can usually be replaced without recalibration.
A defective opamp may appear to work, yet have extreme temperature sensitivity. If
parameters appear to drift excessively, freeze-spray may aid in diagnosing the prob-
lem. Freeze-spray is also invaluable in tracking down intermittent problems. But
use
it sparingly, because it can cause resistive short circuits due to moisture condensation
on cold surfaces.
Technical Support
If you require technical support, contact Orban customer service. Be prepared to de-
scribe the problem accurately. Know the serial number of your 8300

this is printed
on the rear panel of the unit.
Telephone: (1) 510 / 351-3500
Write:
Customer Service
Orban
1525 Alvarado Street
San Leandro, CA 94577 USA
Fax: (1) 510 / 351-0500
E-Mail custserv@orban.com
Please check Orban’s website,
www.orban.com , for Frequently Asked Questions and
other technical tips about 8300 that we may post from time to time. Manuals (in
.pdf form) and 8300 software upgrades will be posted there too — click
“Downloads” from the home page.
Factory Service
Before you return a product to the factory for service, we recommend that you refer
to this manual. Make sure you have correctly followed installation steps and opera-
tion procedures. If you are still unable to solve a problem, contact our Customer Ser-
vice for consultation. Often, a problem is relatively simple and can be quickly fixed
after telephone consultation.
If you must return a product for factory service, please notify Customer Service by
telephone,
before you ship the product; this helps us to be prepared to service your
unit upon arrival. Also, when you return a product to the factory for service, we rec-
ommend you include a letter describing the problem.
Please refer to the terms of your Limited One-Year Standard Warranty, which ex-
tends to the first end user. After expiration of the warranty, a reasonable charge will
be made for parts, labor, and packing if you choose to use the factory service facility.
Returned units will be returned C.O.D. if the unit is not under warranty. Orban will