Elenco 3 1/2 Digit Cap. / Trans. Kit - Manual (Page 20)

-16-
PARTS LIST - SECTION C
RESISTORS
Qty. Symbol Description Color Code Part #
r 1 R38 1.87k
Ω
1% 1/4W brown-gray-violet-brown-brown 141830
r 1 R37 3k
Ω
1% 1/4W orange-black-black-brown-brown 143030
r
1 R39 6.8k
Ω
5% 1/4W blue-gray-red-gold 146800
r
1 R34 100k
Ω
5% 1/4W brown-black-yellow-brown 161000
r 2 R35, R36 100k
Ω
1% 1/4W brown-black-black-orange-brown 161030
r 1 VR2 200
Ω
Trim Pot 191320
Note: Resistor tolerance (last band) of 5-band resistors may be blue instead of green.
CAPACITORS
Qty. Symbol Value Description Part #
r 1 C7 470pF (471) Disc 224717
r
1 C10 .33
μ
F (334) Mylar (small yellow) 253318L
r
2 C8, C9 4.7
μ
F Electrolytic (Lytic) 264747S
r 1 C11 10
μ
F Electrolytic (Lytic) 271015S
SEMICONDUCTORS
Qty. Symbol Value Description Part #
r
3 D3 - D5 1N4148 Diode (glass) 314148
r
1 IC2 LM324 Op-Amp 330324
MISCELLANEOUS
Qty. Symbol Value Description Part #
r 1 IC Socket 14-pin 664014
SECTION C
AC Voltage & Current Circuit
ASSEMBLE THE FOLLOWING COMPONENTS TO THE PC BOARD
Bottom Legend Side
R37 - 3k
Ω
1% 1/4W Res.
(orange-blk-blk-brn-brn)
(see Figure I)
D4 - 1N4148 Diode
D5 - 1N4148 Diode
(see Figure L)
C8 - 4.7
μ
F Lytic Capacitor
(see Figure B)
C10 - .33
μ
F (334) Mylar Cap.
(may be marked 334)
D3 - 1N4148 Diode
(see Figure L)
C7 - 470pF (471) Discap
Figure L
Stand diode on
end. Mount with
band as shown on
the top legend.
R38 - 1.87k
Ω
1% 1/4W Res.
(brn-gray-violet-brn-brn)
(see Figure I)
C9 - 4.7
μ
F Lytic Capacitor
(see Figure B)
R35 - 100k
Ω
1% 1/4W Res.
(brown-blk-blk-orange-brown)
(see Figure I)
R36 - 100k
Ω
1% 1/4W Res.
(brown-blk-blk-orange-brown)
(see Figure I)
D3
D5
D4
Assembled View
-19-
PARTS LIST - SECTION E
RESISTORS
Qty. Symbol Description Color Code Part #
r 1 R29 10
Ω
1% 1/4W brown-black-black-gold-brown 121030
r
1 R28 90
Ω
1% 1/4W white-black-black-gold-brown 129030
r 1 R45 150
Ω
1% 1/4W brown-green-black-black-brown 131530
r 1 R27 900
Ω
1% 1/4W white-black-black-black-brown 139030
r
1 R42 1.91k
Ω
1% 1/4W brown-white-brown-brown-brown 141930
r 1 R43 4.3k
Ω
1% 1/4W yellow-orange-black-brown-brown 144330
r
1 R26 9k
Ω
1% 1/4W white-black-black-brown-brown 149030
r 1 R44 10k
Ω
1% 1/4W brown-black-black-red-brown 151030
r 1 R47 11k
Ω
1% 1/4W brown-brown-black-red-brown 151130
r
2 R40, R41 39k
Ω
1% 1/4W orange-white-black-red-brown 153930
r 1 R46 76.8k
Ω
1% 1/4W violet-blue-gray-red-brown 157630
r
1 R25 90k
Ω
1% 1/4W white-black-black-red-brown 159030
r 1 R48 160k
Ω
1% 1/4W brown-blue-black-orange-brown 161630
r 2 R49, R50 220k
Ω
5% 1/4W red-red-yellow-gold 162200
r
1 R24 900k
Ω
1% 1/4W white-black-black-orange-brown 169030
r 1 VR3 200
Ω
(201) Trim Pot 191320
Note: Resistor tolerance (last band) of 5-band resistors may be green instead of brown.
CAPACITORS
Qty. Symbol Value Description Part #
r 4 C12 - C15 .01
μ
F (103) Mylar (large brown) 241017L
SEMICONDUCTORS
Qty. Symbol Value Description Part #
r 4 D6 - D9 1N4001 Diode 314001
r 1 IC3 LM324 Op-Amp 330324
MISCELLANEOUS
Qty. Symbol Value Description Part #
r 1 IC Socket 14-pin 664014
r 2 h
FE
Socket 664015
SECTION E
Capacitance and Transistor Testing Circuit
r Attach the LCD to the PC board using the two 2.5
x 8mm screws. Use the top-mounting hole and
lightly tighten the screws. The screws will be
removed to assemble the next section.
Testing Procedure
1. Place the top label over the knob and turn the
range selector knob to an OHM scale position.
2. Connect the 9V battery to the battery snap.
3. Connect the test leads (red lead to V
Ω
CAP and
black to COM). Turn the meter on by pressing the
power switch.
4. Test the Ohms, Buzzer, and Diode functions
using the procedures below.
OHMs - Using two or three different value resistors,
check each scale. Compare the kit meter readings
with another meter of known accuracy. If the tests
are not working, check the solder of the PTC.
Buzzer - Set the selector knob to the Buzzer ( )
position. Short the red and black leads and the
buzzer should sound. If the buzzer does not sound,
check components R51-R58, PTC, C16, C17, and
the solder connections to the buzzer.
Diode - Connect a diode to the test leads with the
correct polarity (see figure below). The meter will
range for 100 - 950.
5. Turn the meter off and remove the battery, top
label, and test leads.
6. Remove two display mounting screws and
display by unscrewing the two mounting screws.
DO NOT PROCEED TO SECTION E WITHOUT INSTRUCTOR’S APPROVAL.
COM V
Ω