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Chapter 6
NOTE. MGD Technologies Inc. recommends replacing the ADFM
Electronics Unit unless the problem is obvious and can be safely repaired
in the field.
b. If mains power is used for supplying the ADFM with power, check if
your mains outlet has the proper voltage.
1. Check if the Mains Power Switch at the front panel is in the On-
2. Check the mains fuse. The mains fuse is located on the front
CAUTION. Replace the fuse only with the specified fuse type, and fuse
rating. Do not short circuit the fuse or fuse holder, as this presents a fire
hazard. PLEASE READ THE WARNINGS AND CAUTIONS AT THE
BEGINNING OF THIS MANUAL, AND THE BEGINNING OF THIS
SECTION.
c. If an external DC-supply is used to supply the ADFM check if your
external supply is functioning, and is able to supply the proper volt-
age to the ADFM. Proper DC voltage is 12 to 26 VDC. Check if the
Battery Switch at the front panel is in the On-position ("1"-position).
You have to use the supplied key to rotate the switch.
If the above procedure is not successful in establishing communications
with the ADFM, most likely the problem lies within the ADFM's Electron-
ics Unit. You may have to remove the Electronics Unit's top cover for fur-
ther fault isolation.
CAUTION. You must obey all warnings and cautions regarding power and
ESD. Please read these warnings at the beginning of this manual, and the
beginning of this section.
Regardless of which type of power you are using you can measure the
ADFM's Electronics Unit's internal voltages at the test points (TP) listed in
Table 6-39. If you are facing the front panel, all listed test points are lo-
cated at the lower left corner of the ADFM motherboard. Also the test/reset
switch labeled "S1" is located at these test points.
d. Once you applied power to the system and switched the appropriate
power switch into the On-position ("1"-position), you should be able
to measure the unregulated (raw) supply voltage VPWR+ at test
point TP7. If you are able to measure VPWR+, the power supply
connection is OK. You should be able to measure this voltage re-
gardless which type of power you are using, or regardless of any
combination of power you are using.
page 6-8
position ("1"-position). You have to use the supplied key to ro-
tate the switch.
panel of the ADFM electronic chassis. Remove the mains power
cord, and gently prey open the fuse drawer, and check the fuse.
MGD Technologies, Inc.
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