Elenco Whooper Alarm - Manual (Page 2)

-6-
TR
OUBLESHOO
TING
Consult y
our instr
uctor or contact Elenco
®
Electronics if y
ou ha
v
e
an
y prob
lems
.
DO NO
T
contact y
our place of
purchase as the
y
will not be ab
le to help y
ou.
1.
One of the most frequently occurr
ing prob
lems is poor solder connections
.
a)
T
ug slightly on all par
ts to mak
e
sure that the
y
are indeed soldered.
b)
All solder connections should be shin
y.
Resolder an
y that are not.
c)
Solder should flo
w
into a smooth puddle r
a
ther than a round ball.
Resolder an
y connection that has
fo
rm
ed into a ball.
d)
Ha
v
e
an
y solder br
idges f
o
rm
ed? A solder br
idge ma
y occur if y
ou accidentally touch an adjacent f
oil
b
y
using too m
u
ch solder or b
y
dr
agging the solder
ing iron across adjacent f
oils
. Break the br
idge with
y
our solder
ing iron.
COMPONENT CHECK 1.
Be sure that all of the components ha
v
e
been mounted in their correct places
.
2.
Be sure that the electrolytic capacitors C1 and C4 ha
v
e
been installed correctly
.
These capacitors ha
v
e
polar
ity
, the negativ
e and positiv
e leads m
u
st be in the correct holes
, as sho
wn on the top legend of the PC
board.
3.
Be sure that tr
ansistors Q1 - Q5 ha
v
e
been installed correctly
.
The flat side should be in the same direction
as sho
wn on the top legend.
4.
Use a fresh 9 v
olt batter
y.
5.
Read the circuit oper
ation lesson man
ual to f
a
miliar
iz
e y
ourself with the w
o
rk
ings of the circuit.
SCHEMA
TIC DIA
G
RAM
P
A
R
T
S LIST
If y
ou are a student, and an
y par
ts are missing or damaged, please see instr
uctor or bookstore
.
If y
ou purchased this
Whooper Alar
m Kit from a distr
ib
utor
, catalog, etc., please contact Elenco
®
Electronics
(address/phone/e-mail is at the bac
k of this man
ual) f
o
r additional assistance
, if needed.
DO NO
T
contact y
our
place of purchase as the
y
will not be ab
le to help y
ou.
RESIST
ORS
Qty
.
S
ymbol
Description
Color Code
P
a
rt
#
r
1
R
8
100
Ω
5% 1/4W
bro
wn-b
lac
k-bro
wn-gold
131000
r
2
R3, R6
1k
Ω
5% 1/4W
bro
wn-b
lac
k-red-gold
141000
r
1R
2
2
.2
k
Ω
5% 1/4W
red-red-red-gold
142200
r
1R
5
6
.8
k
Ω
5% 1/4W
b
lue-g
ra
y
-red-gold
146800
r
2
R1, R9
15k
Ω
5% 1/4W
bro
wn-g
reen-or
ange-gold
151500
r
1
R
4
22k
Ω
5% 1/4W
red-red-or
ange-gold
152200
r
1
R
7
27k
Ω
5% 1/4W
red-violet-or
ange-gold
152700
CAP
A
C
IT
ORS
Qty
.
S
ymbol
V
a
lue
Description
P
a
rt
#
r
2
C2, C3
.047
μ
F (473)
Discap
244780
r
2
C1, C4
100
μ F
E
lectrolytic
281044
SEMICONDUCT
ORS
Qty
.
S
ymbol
V
a
lue
Description
P
a
rt
#
r
3
Q
1, Q3, Q4
2N3904
T
ransistor
323904
r
1
Q
2
2N3906
T
ransistor
323906
r
1
Q
5
M
PS6531
T
ransistor
326531
MISCELLANEOUS
-1-
Resistor
T
ransistor
Capacitor
s
P
A
R
T
S IDENTIFICA
TION
Discap
Electrolytic
Batter
y
Snap
Speaker
Switc
h
B
A
TTERIES
•
Do not shor
t circuit the batter
y
ter
m
inals
.
•
Ne
v
e
r thro
w batter
y
in a fire or attempt to open it.
•
U
se only 9V type (not included).
•
Inser
t batter
y
with correct polar
ity
.
•
N
on-rechargeab
le batter
ies should not be
recharged.
•
Remo
v
e batter
y
when it is used up
.
•
B
atter
ies are har
mful if s
w
allo
w
ed, so k
eep a
w
a
y
from small children.
Qty
.
S
ymbol
Description
P
a
rt
#
r
1
P
C Board
518000
r
1
S
1
S
witch Slide SPDT
541102
r
1
S
older Roll 24”
551124
Qty
.
S
ymbol
Description
P
a
rt
#
r
1
B
1
B
atter
y
Snap 9V
590098
r
1
SPK1
Speak
er 8
Ω
590102
r
2
W
ire 4”
Blue
814620