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DAV-INS-001-850B
REV 0 10-27-21
DAVTRON, INC.
Important information
Warranty Policy: Davtron's warranty policy is one year from date of installation on all parts, excluding
batteries.
Technical Support: If you should need technical support, first check out the "Frequently Asked
Questions" tab related to your unit. If you are unable to fix the problem, Davtron has on-site technicians
who can help you step-by-step over the phone. You can call our main line at (866) 369-5588 and ask for
technical support or email
Repair Info: Davtron offers 5 day turn-around service on most repairs. We charge a flat labor rate see
support page on-line, plus parts and shipping. If repairs are returned to factory via Federal Express®, we
can sometimes get them out the same day. Davtron doesn't require a RMA #.
Recommend to see our repair form (see support page on-line) and use as template and provide details
to the problem occurring with unit as well as your return address and contact information and ship to
the following:
DAVTRON INC.
ATTN: REPAIRS DEPT
427 HILLCREST WAY
REDWOOD CITY (Emerald Hills ), CA 94062
(650) 369-1188
All Davtron products are designed and manufactured in Redwood City, CA.
Installation of the M850B system is supplemental only; it is not intended as a replacement for or
modification to an existing, approved, or required system. This model is limited to installation in non-
pressurized, Part 23, Class I and II aircraft and is FAA approved under NORSEE policy PS-AIR-21.8-1602.
The M850B system is not a required system and may not be used as a substitution for the certificated
aircraft system. No operational credit may be taken for installation of M850B system.
The M850B uses a small coin cell battery (CR2032) and may require replacement. We suggest to return
the unit for service if the unit does not maintain correct time when the aircraft is not operating.
Testing the display of the M850B, In GMT mode, Hold the SEL button down for three seconds and the
display will indicate 88:88 and activate all five annunciators. See details how to set and operate in the
M850B brochure.
Not for use as a primary M850B (instrument, visual display, etc.) for flight
