Graymark 808 User Manual
PARTS IDENTIFICATION AND INVENTORY EXPERIENCE
This experience is provided to acquaint you with the
vari-
ous electronic components and fittings included in this
To assist you in proper identification of the major parts and
project. Unpack the project carefully and check
(V)
each
fittings, pictorial and schematic illustrations are given in
part and fitting against the PARTS LIST In case of incor-
Figure
1,
rect, missing, or damaged parts, please refer to How to
Or-
der Replacement Parts and Graymark’s Warranty.
Upon completion of the parts identification and inventory,
have your instructor initial your Progress Guide.
-;
DIODE, SIGNAL
i
i
u
IA@09
INTEGRATED CIRCUIT
FUSE HOLDER
DIODE, POWER
1
,
TRANSFORMER
POWER RESISTOR
HEAT SINK
LM317-LM337
POST, RED,
BlACK
POTENTIOMETER
RUBBER FOOT
+-_-_-.-
SOLDER LUG
.- . . _.-
._
. _d
_._~_~__
--I
MACHINE SCREW
SELF-TAPPING SCREWS
f3 x Qmtn
AND 2.6 x
5mm
i
SPACER
1Omm
AND
4Omm
~-_---..-
ELECTROLYTIC
CAPACITOR
PCB
---j----
LM317-LM337
BREADBOARD
--
__.
-..---_
,
LOCK WASHER SPLIT
STRAIN RELIEF
AND INTERNAL STAR
TRANSISTOR
FIG.
1
5
FIG. 29A
_FlG.
29B
l
I
TPl8
0
T:-I
5”
TP17
I
I
OT:+W
1 .
I
.
, RlO
0
Dll
T&
’ f
r----------
i
l
, .
I
I
I
1
R6
l-/N
OJOJI
fTP9
l Tm
.b.
. . . .
TPlA
YELLOW fl
FYELLOW
FIG.
30
BUCK+
MBL”E
connect the meter test leads from the power
Plug
.
-
24. Position the two portions of the AC power cord
grommet around the cord where it extends out of
rear of the cabinet top, as shown in Fig. 29A. Using slip-joint pliers, insert the grommet into the
hole in the rear of the cabinet top as shown in Fig.
29BYou
will have to squeeze the grommet quite
hard with the pliers so that the power cord is
formed into a “U” inside the grommet, and the
grommet is compressed enough to fit into the
hole.
-
25. Locate the Printed Circuit Board (PCB) and the
test points. Insert and solder
TPl
through
TPl9
into the PCB. The test points are inserted from
the component side of the PCB and soldered to
the copper on the solder side of the
PCB.
Refer
to Fig. 30 and the the silkscreened legend on the
component side of the PCB for the test point
locations.
-
26.
From the solder side (bottom) of the PCB thread
the transformer leads through the holes in the
PCB as shown in Fig.
3O.Then,
from the component side (top) of the PCB, thread the stripped
and tinned wire ends through the holes marked
YL, BL and
BK.
Solder these five wires to the
PCB, and cut off any excess lead length. Note:
This is done so when the board is handled during
component installation and testing, the wires
won’t bend and break at the weak points where
the wire insulation stops and the tinned copper
wire goes through the PCB.
AC VOLTAGE WAVEFORMS AND VALUES
DISCUSSION
Measuring a DC voltage is simple and straight forward.
Shown on a graph, the voltage of an automobile battery
would appear as a straight horizontal line. In Fig.
31
the
ver-
tical
axis shows the magnitude of the voltage being meas-
ured, and the horizontal axis represents time. The time
shown on the graph would be in the order of several
sec.
ends,
the time it takes for the meter pointer to stabilize and
for you to accurately read the
meter.The
graph shows that
the meter test probes were connected to the the battery at
19
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