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Zenith H-100 - Page 74

Zenith H-100
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5-158
FREQUENCY
COUNTER
METHOD
Allow a
fifteen
minute
warm-up
of
the
board
with
the
top
cover
of
the
computer
in
place.
Remove
the
top
cover
of
the
computer.
Connect
the
common
test
lead
of
the
multimeter
to
the
GND
test
point
at
the
upper
left
side
of
the
controller
board.
Refer
to
the
H-207
Controls
and
Jumper
Locations
pictorial.
Connect
the
positive
test
lead
to
the
CP2
test
point.
Adjust
the
BIAS
control
(R2)
until
the
multimeter
display
shows
+1.40
VDC
(+.05
volts).
Switch
the
multimeter
to
lower
ranges
to
perform
this
adjustment
accurately.
Disconnect
the
multimeter.
Connect
the
common
lead
of
the
frequency
counter
to
the
GND
test
point.
Connect
the
test
probe
of
the
frequency
counter
to
the
CP1
test
point.
Adjust
the
FREQ
control
(R1)
until
the
frequency
counter
display
shows
4.000
MHz.
Disconnect
the
frequency
counter.
The
adjustments
to
the
Data
Separator
are
now
complete.
Proceed
to
WRITE
PRECOMPENSATION
ADJUSTMENTS.

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