Eico ST 40 - Voltage and Resistance Chart

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ST4Q
PAGE
16
VOLTAGE AND
RESISTANCE
CHART
Pin*
Column 1
DC volts
at
20
watts
each
channel
Column
2
DC volts at
no
signal
Column 3
AC
volts
(signal) at
,0023V
into
Mag. Phono
Input
Column 4
Resistance in ohms. Pin
8
of XVI
1
grounded
VI,
2
1
107 1-13
.275
75K
2
0 0 .018
{. 5Meg
3
.0.9
.
0.83 .01
1150
4 15 14
125-175
5
1.5
14
125-175
6
38 41 .018
355K
7
0 0 .0023
1 13K
8
0,5
. 0.5 .0027
2300
9
15
14 125-175
V3,
4
1
54
50 0.86
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3
1.75
LS3
fe H
jpl
mu III
/iIMIW'hi.'
ill
1
'V'V
c
>’
Tji
’
83K
SBs&A?*'
0.064
320K
.
4
2
QHHM
V5,6
i
195 . 215 92K
86
89
... ......
340K
3
93
97 82K
4
125-175
sssiss
^
125-175
89 340K
-
. -W-
.
-y*
. 300K
1. IK
125-175
V7,
8
1
0
0 8.1 330K
V9,
10
2 15 14 125-175
3 395
396 220
170-210
4
310
318 2.7
1800
5 15 14
,05 125
6
.
0
0 8.1 330
K
7 15 14
125-175
8
310
318 .23 1800
Vll
1
2
402 407 >
30K**
*
J
3
4 335* 335*
20-35
5
6
335*
335
,:
’
20-35
7
8
402
407
>
30K**
V
*AC 60
cycles
**Short
From pin
8
of XV 11 to ground
removed
Note: Throughout voltage checks,
a dummy
load
must be
connected across
each
amplifier output.
Column 1
-
Feed a Ike signal into
TAPE/AUX, J input. Set ST-40
controls as follows;
SELECTOR
switch
at
TAPE/AUX.
,
MODE switch
at
MONO
1,
BALANCE control
at
0,
LEVEL
control at
10,
BASS controls at
0,
TREBLE controls at
0,
and all slide switches to the down
(off)
position.
Adjust
audio generator output for 20
watts
output
each channel.
Column 2
-
Remove input signal.
Use same control
settings as
in'
Column 1.
Column 3
-
AC signal voltages
checked one channel at a time. To test Channel
1 amplifier, feed a
.0023 volt, lkc
signal from an audio generator to the PH.
A1
input. Set SELECTOR switch
at
PH.
A,
MODE switch
at
\/CH.
1,
and all other controls as given for Column 1. To test
Channel
2 amplifier,
feed a .0023 volt, lkc
signal to the PH. A2
input
and
set the MODE switch at
\/CH. 2.
Column 4
-
Set controls
as for Column 1. Disconnect unit from
AC line and remove all
input
and output connections. Short pin 8 of
XVI
l
to chassis ground
with a jumper throughout
resistance measurements, except when
resistances ot
XVII pins
are being checked.