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SCHEMATIC NOTES
-Circuitry
not
used
in
some
versions
-
Circuitry
used
in
some
versions
See
parts
list
Ground
Voltages
measured
with
digital
meter.
Waveforms
and
voltages are taken
from ground, unless
noted
otherwise.
Voltages,
waveforms and
logic
readings taken with
printer
On
Line
and
in
self-test
mode
unless otherwise
noted.
Switches
SW1
and
SW2
set
as
shown
on
schematic.
Waveforms
taken with
triggered
scope and Sweep/Time
switch
in
Calibrate position,
scope
input set
for
DC
coupling
on
"0"
reference voltage
waveforms. Switch
to
AC
input to
view
waveforms
after
DC
reference
is
mea-
sured
when
necessary.
Each waveform
is
7.5cm
width
with
DC
reference voltage given
at
the
bottom
line
of
each waveform. Time
in fis
per
cm,
given with
p-p
reading
at
the
end
of
each waveform.
Item
numbers
in
rectangles
appear
in
the alignment/adjust-
ment
instructions.
Supply
voltage
maintained as
shown
at input.
Controls adjusted
for
normal
operation.
Terminal
identification
may
not
be found on
unit.
Resistors
are
V2W
or
less,
5%
unless
noted.
Value
in
(
)
used
in
some
versions.
NOTE:
Logic probe readings taken with
printer
On
Line
and
in
self-test
mode
unless otherwise
noted.
Switches
SW1
and
SW2
set
as
shown
on
schematic.
Logic Probe Display
L=Low
H =
High
P
=
Pulse
#=Open
(No
lights
On)
(1)
Probe
indicates
H
when
printhead
is
at
home
position.
(2)
Probe
indicates L
when
printhead
is
at
home
position.
(3)
No
indication
when
printhead
is
at
home
position.
(4)
Probe
indicates
P
during
line
feed.
(5)
No
logic
reading taken.
31
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