Service manual
Gheckou
Procedures
5.9
Voltage
Gain
Spee
2666
Gg%n;
Gain
of
20,8
k3%.
Spac
0.775V
5e~%itlvi~:
REF
I
."---Gain
at
'508.65
&3%,
REF
!i
-~~~~~~~~~Eain
af
68,28
~3%.
Spec
1.4V
S~nsltivlQ:
REF
I
---Gain
of
5521
&3%.
REF
t
l
----Gain
st
37
.SO
a3%,
Inibtia%l
Eondlti@n%:
Controls
per standard.
26
dB
Procsduf@:
Inject
a
0,775
VAC
1
kHz
sine
wave
with
the Sensitivity
Switch
in
ths
26
dB
position,
Mea-
sure
15.5
VAC
f0.S
VAC
at
the
amplifier
skstpu2.
0,775V
Prosedut~::
Inject
a
0.775
VAC
1
kHz
sins
wave
with
the
Sensitivity
Switch
in
the
8.975V
position*
REF
i
measure
78
VAC,
f2.3
VAC,
at
Zh@
amplifies output.
REF
II
measure
52.9
VAC,
;s;.
"1.6
VACt
at
the
amplifier
output.
1
.@V
Bros@dure:
lnject
a
1,4
VAC
1
kHz
sine
wave
with
the
S~n~itisgify
Switch
in
the
1.4V
position.
REF
1
mea-
Figufe
5.2
DiF@r@nZia$ed
Square
Wave
sum
778
VAC,
&2,3
VAC,
st
the
amplifier
output.
REF
I!
measure
52.9
VACF
A
1.6
VAC,
at
the amplifier
output*
5,10
Level
C~ntrsls
S@@s:
kevef
cantroiled
by
level
controls,
Inltlairl
Conditiows:
Controls
per
standard.
Bre@adur@:
No
Laad,
lnject
a
%
kHz
sine
wave.
With
level
controls
fully
clockwise
you
should
see
futf
gain,
As
controts
are
rotated
eountercixkwise,
sbsewe
sirni-
Iiar
gain
reduetisn
in
each
channel,
&$hen
complete,
return
!eve8
contrsls
$0
fully
clockwise
pssitian,
5,lf
Current
Limit
Spec:
REF
1
---Current
fimit
at
43
amps,
323
amps.
REF
II
-Current
limit
at
30
amps,
k3
amps,
lnrtlal
Csndftians:
ConWols
per
standard.
Procad&~s:
Load
each
channel
ta
7
Ohm.
Inject
at
"I
kHz
differentiated
&ear
38%
duty
cycte)
square
wave.
See
Figure
5%
f
.
Insrease
output
level
until
current
lim-
iting
occurs,
Refer
$0
Figure
52
for
wave
Form.
REF
f
will
limit
(clip)
at
43
vstt
peak,
2~3
voltss.
REF
II
will
limit
(clip)
at
38
v~iwpeak,
k3
volts,
In
-I
Out
5.12
Slsw
Rate
&
10
kHz
Square
Wave
Spac:
REF
1
-23
d3
V/pS.
REF
If
-1
9
~3
V&S.
lnltrai
eondltlo~s:
Cantrsls
per
standard,
F~ecedurg:
Laad
each
~hawwel
to
8
sk~rns.
inject
a
10
kHz
square
wave
at
a
level
of
2
ts
5
volts
below
clip.
Observe
the slope
af
the
waveform
and
catculate
the
sllew
rate,
Any
ringing
must
die
out
in
lass
than
"44
of
the
period,
and
its
amplitude
must
be
less
then
2%
aOf
%be
waveform
amplitude.
See
Figure
5.3.
Figure
5.3
IQ
kHz
Square
kVave
Electrical
Checkout
5-2