Graymark 803 - TESTING PROCEDURE; Potentiometer and Voltmeter Setup; Output Voltage Verification; Testing Completion

TESTING
Before
testing your
Cravmark Power Supply, compare
your
wiring
to that
shown
in Fig.
7, and be sure
you
have made
good
solder
connections.
For
testing this unit
you will need
a voltmeter.
If
no
voltrneter is available
you
may simply test
your
power
supply by connecting
it
to a transistor
radio
as
described
in Operating Procedure on
page 19.
1. Rotate the
potentiometer
shaft f ully counterclock-
wise to the MIN
position.
2. lnsert the line
cord
plug
into
a
110-120 VAC wall
receptacle.
-3.
Adjust
the voltmeter
to the 0-50
volt DC range.
Then,
connect the negative
(-)
meter lead
of the
voltmeter
to the
negative
(-)
terminal
post
(black)
on
the
power
supply and
the
positive
(f
)
meter
Iead
to the
positive
(
1-)
terminal
post
(red).
4.
The
meter should now read
0
volt.
-5.
Slowly
rotate the
potentiometer
shaft
to the full
clockwise
position.
The voltmeter should
now read
between
15
and
1B volts
DC. lf this voltage
is not
obtained,
UNPLUC
THE LtNE
CORD.
recheck
all
wiring,
component
placement,
solder
connections,
and
then
refer to the
Service
Flow
Chart
on
page
22.
-6.
This
completes
the
testing
of
your
Model
803 Power
Supply. UNPLUC
THE LINE
CORD.
Have instr-
uctor
initial
your
Progress Cuide.
Ql
(o
u1
o-:<?
/
CABINET ASSEMBLY
-1.
Position
the front
panel
onto the
plastic
cabinet
and
align
the
mounting
holes. Secure the
panel
to the
cabinet
with
four
self-tapping screws
(Phillips
screw),
as
shown
in Fig.
11.
-2.
Rotate
the
potentiometer
shaft fully counterclock-
wise. Position
the knob onto the
shaft
with
the
in-
'dicator
line
to the
left
pointing
toward the
"MlN"
position).
Secure the knob
by tightening the set-
scfew as
shown in Fig. 12.
-3.
This
completes
the cabinet assembly
of
your
Model
803 Power
Supply.
Have
instructor initialyour
Pro-
gress
Cuide.
CONTROLKNOB
SCREWDRIVER
SETSCREW
Ctttra,ga
SELF.TAPPING MACHINE
SCREW
@0,
-
18
F"Tav*r.Rr.
Ftc.
12
VO
LTA,
OE
AO.-/
us
r
FIG.11