-10-
PARTS LIST - SECTION A
If any parts are missing or damaged, see instructor or bookstore.
DO NOT
contact your place of purchase as they will not
be able to help you.
Contact Elenco™ Electronics (address/phone/e-mail is at the back of this manual) for additional assistance, if needed.
RESISTORS
Qty.
Symbol
Description
Color Code
Part #
1
R24
56k
Ω
5% 1/4W
green-blue-orange-gold
155600
1
R19
100k
Ω
5% 1/4W
brown-black-yellow-gold
161000
1
R20
110k
Ω
5% 1/4W
brown-brown-yellow-gold
161100
6
R16, 17, 18, 21, 22, 23
1M
Ω
5% 1/4W
brown-black-green-gold
171000
Note:
Resistor tolerance (last band) of 5-band resistors may be green instead of brown.
CAPACITORS
Qty.
Symbol
Value
Description
Part #
1
C2
100pF (101)
Ceramic Capacitor
221017
1
C3
.047
µ
F (473)
Mylar Capacitor
244717
1
C4
.1
µ
F (104)
Mylar Capacitor
251017
2
C5, C6
.22
µ
F (224)
Mylar Capacitor
252217
SEMICONDUCTORS
Qty.
Symbol
Value
Description
Part #
1
ZD
1N5232/1N752
Zener Diode
315232
1
U2
4030/4070
Integrated Circuit
334030
1
U1
7106R
Integrated Circuit
337106R
MISCELLANEOUS
SECTION A
Meter Display Circuit
Resistor
PARTS IDENTIFICATION
Capacitor
Ceramic
Mylar
Diode
Integrated Circuit
Socket
Liquid Crystal Display (LCD)
*
*
* Parts installed on PC board already.
Qty.
Description
Part #
1
Liquid Crystal Display (LCD)
35114A
1
Zebra
500000
1
PC Board
516000A
1
Solder Roll
551135
1
Battery Snap (BAT)
590098
1
Battery
590009
1
LCD Window Plate
621002A
1
Range Selector Knob
622003
1
Bushing
624004
Qty.
Description
Part #
1
LCD Stopper
629005
1
LCD Housing
629007
2
M2.3 x 6 Screw
642360
1
M2.3 x 8 Screw
642430
1
IC Socket 40-Pin
664040
6
Slide Contact
680016
1
Top Plate (A)
724001A
2
Shims (see page 26)
780006
*
*
Battery Snap
Top Plate (A)
LCD Housing
LCD
LCD Stopper
Zebra
LCD Window
Plate
-25-
Amps Section
1. 200mA scale not working:
A. Check fuse.
B. Measure across (A) terminal and (COM)
terminal for 1
Ω
(set meter in 200mA).
1. Lower or higher than 1
Ω
, Check R13.
2. 20mA scale not working:
A. Check fuse.
B. Measure between (A) terminal and
(COM) for 10
Ω
(set meter in 20mA).
1. Lower or higher than 10
Ω
, check R12
and R13.
Capacitance Section
1. Place .001
µ
F cap in the socket and check pin 7
and pin 8 of U4 with a scope (meter set to 2N).
Pin 7 370Hz - 400Hz .12Vpp.
Pin 14 370Hz - 400Hz .3Vpp.
A. No signal at pin 14.
1. Check D3, D4 and shorts.
B. No signal at pin 7 but present at pin 1.
1. Check D5 and D6.
h
FE
Section
1. Check for shorts on socket pins.
2. Measure across B terminal to COM terminal for
251k
Ω
.
A. Lower or higher than 251k
Ω
; Check R14
and R15.
Decimal Point Section
1. Displays two decimal points.
A. Shorted output on U2.
2. No decimal points displayed.
A. Check U2 325.
Diode
1. Measure voltage across V OHM and COM
terminal (set in diode mode) = 1.3V.
A. Low voltage, check R26.
Battery Low Indicator
1. Not working.
A. Check ZD1, R19 and U2.
