9825A/B
Adjustments 6-1
Chapter 6
9825A1B
Adjustments
9825A1B
Sequence of Adjustments
Adjustments for the 9825A/B desktop computer should
be
performed
in
the following order:
1.
Power Supply Voltages;
+ 12 Supply
first,
then
+ 7 Supply.
2.
Processor Clock Frequency.
3. Printer print head alignment.
4.
Printer
paper
advance.
5. Printer Intensity.
9825A1B
Power SupplyAdjustments
The following tools are
needed
to adjust the power supplies:
Digital Multimeter
(DMM)
1/8 inch flat tip screwdriver
1.
Turn off the 9825A/B
and
remove the following:
a.
Interface Cards.
b.
Plug-In Option
ROMs.
2. Turn
on
the 9825A/B
and
let
it
warm up for 10 minutes. No programs should
be
running,
only the lazy
"T'
should be displayed.
3.
Refer to the diagram below, locate the + 12 and + 7 volt test points
and
adjustments.
4.
Ground
DMM
on
the power supply heat sink or power module sheet metal.
5.
Usethe
DMM
and
adjust the + 12 then the + 7 volt supplies as follows:
+ 12 Volt, adjust
Rll,
..... + 11.95 to + 12.05
VDC
+ 7 Volt, adjust R16, ..... + 6.9 to + 7.1
VDC
Note
Only
the
+ 12 Adjustment
is
on Rev. A
and
B power supplies.
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