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Eico 232 User Manual

Eico 232
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Intermittent operation on all functions
1.
Loose or bad connections in probe or cables.
2.
Wiper
contact
on SlB or SlC
defective.
3.
Loose or bad connection in bridge
circuit
wiring, including meter
terminals. With power
applied,
probe wiring and components with insulated
probe.
4.
Yl
defective.
Replace
as
described under "Tube Replacement."
5.
CRl Intermittent.
Instrument
fails to operate on OHMS; works normally on ac and dc voltage
measurements.
1. Battery exhausted or not making
contact.
2. Defective wiper
contact
on switch section S2C.
3. "OHMS"
contact
(terminal 7) on SlB
defective.
4.
Open
circuit
In
resistor network or burned
out
resistor around switch
section
S2C. Check continuity of network
R5
through
Rll.
NOTE:
This
net-
work
Is
made up
of
resistors which are added
in
series
as
switch
is
rotated.
Therefore, one faulty resistor
may
cause improper operation
on
one or more
ranges.
5.
Loose or broken "Ohms"
contact
on switch section SlC (terminal 1)
OHMS ADJ. fails to give infinity setting on "OHMS"
scale.
1. Battery exhausted.
2.
OHMS ADJ. potentiometer,
R30
defective.
3.
Yl
defective.
See "Tube Replacement".
Resistance readings Inaccurate on
some
or all "ohms" ranges.
1.
One
or more resistors in network around switch section
S2C
have changed
value.
2.
Excessive leakage
In
"ohms"
circuit.
Check switch wafers on
S2C
and SlB fordlrt or damage. NOTE: High humidity may cause leakage and
in-
accurate
readings on high ohms scales. Bake out Inside of Instrument with
light bulb. ,J
3.
Shorted wiring
In
resistor network around S2C.
4.
Fau
Ity or high-resistance connections
In
"ohms"
circuit.
Instrument falls to operate on
anyac
voltage
range; works normally on
OHMS
and
DC
VOLTS.
1.
Y2
defect
ive.
See "Tube Replacement."
2.
AC
volts
contact
on
SlA,
SlB,
SlC,
or
S2B
defective.
3.
Faulty wiper
contact
on S2D.
4.
Open or short
In
circuitry associated with Y2. Check out wiring and
components values with ohmmeter.
5.
C
1,
C2,
or
R29
open; C3 shorted.
·12·
Meter pointer moves off zero when ranges are changed.
1. "AC
Ba
lance" potentiometer
R27
out of adJustment. Readjust
as
de-
scribe under "AC Yoltmeter Balance Adjustment. " If adjustment cannot be
made, then
2.
R28
or
R27
Is
defective.
Check value with ohmmeter.
AC
vo I tage readi
ngs
I naccurate on some or a
II
ac
anges; performance on
ohms
and dc voltage ranges
is
normal.
1.
Defective contacts or wipers, or excessive leakage
In
S2B.
Check for
loose or dirty contacts.
2.
Y2
defective.
Install new 6AL5.
See"
Tube Replacement."
3.
C2
or
C3
leaky.
4.
R29
changed
in
value.
Check with ohmmeter.
If
Instrument
is
Inaccurate on 500 and 1500
volt
ranges only, check contacts
10
and
11
on
S2D
and also
R2,
R3,
and
R4.
If
inaccurate on
1.5
volt
range
only,
replace
Y2. See "Tube Replacement."
Instrument fails to operate on any range of
"+YOLTS'"
or "-YOLTS"; works
normally on
ohms
and
ac
volts. . .
1.
UNI-PROBE resistor is open.
Try
applying
low
dc-voltage
with
UNI-
PROBE
set
at
"AC-OHMS". If reading
Is
obtained (about 10% high), replace
UNI-PROBE resistor.
2.
DC
voltage contacts on switch sections S2A,
Sl
B,
or SIC are
de-
fective. Check for loose or broken contacts.
Yoltage readings Inaccurate on
"+YOLTS".
"-YOL
TS", ac voltage and
re-
sistance readings are correct.
1.
R31
out of adJustment. Reset
as
described under "DC Yoltmeter
Cali-
bration. "
2.
UNI-PROBE switch
Is
shorted, resulting
in
readings about 10% high
on
all
+DC
and -DC voltage ranges.
Use
ohmmeter to check for short
be-
tween input and output of probe
at
"DC" position as well as "AC-OHMS"
position.
3.
Resistances in network around
S2A
has
changed
value.
Check
with
ohmmeter and replace defective resistors.
EICO Repair Service
If
your instrument fails to function properly and the cause of the trouble can
not be found with the trouble shooting information provided,
you
may return
it
tothe
EICO
repair department where It will be repaired
at
a charge of
$5.00
plus the cost of parts. If your Instrument has been built
from
the kit form,
refer to the complete statement of the
EICO
servicing policy in your
con-
struction book. (Note: PleaseincludeUNI-PROBE when returning instrument
for
repair.)

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Eico 232 Specifications

General IconGeneral
BrandEico
Model232
CategoryMeasuring Instruments
LanguageEnglish

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