CBS laboratories 4100 Manual
JANUARY
1974
/■
OPERATING
AND
MAINTENANCE
INSTRUCTIONS
Models,
4100,4
11
0
FM
Volumax
(^0U)
l^y
L/J
k
lA-
/
\
3>-2.7-
7
700
C7<23)
TS7-/4
2
i
PROFESSIONAL
PRODUCTS
CBS
LABORATORIES
A
Division
of
Columbia
Broadcasting
System,
Inc.
Stamford,
Connecticut
0 905
TABLE
OF
CONTENTS
Section
Title
P ge
i
2-1
2-1
2-1
2-4
2-7
1-1
1-1
1-2
1-2
1-5
1-5
1-6
4-1
4-1
4-3
4-5
4-6
4-8
4-9
3-1
3-1
3-1
3-4
3-4
INTRODUCTION
Gener l
Function l
Description
Physic l
Description
W rr nty
Service
nd
Rep ir
Specific tions
OPERATIONAL
SET-UP
Gener l
Set-Up
of
Stereo
FM
Volum x
Unit
Set-Up
of
Mon ur l
FM
Volum x
Unit
Proof-of-Perform nce
Me surements
MAINTENANCE
Gener l
Troubleshooting
G in
Meter
Circuit
Troubleshooting
Input
Section
(Bo rd
A2
or
A5)
Troubleshooting
High
Frequency
Control
Section
(Bo rd
Al
or
A4)
Troubleshooting
Output
Section
(Bo rd
A2
or
A5)
Troubleshooting
AGC
Section
(Bo rd
A3)
Test
nd
Adjustment
Procedures
5-1
5-1
5-3
5-4
5-4
THEORY
OF
OPERATION
Gener l
Input
Section
(Bo rd
A2
or
A5)
AGC
Amplifier
(Bo rd
A3)
High
Frequency
Processor
(Bo rd
Al
or
A4)
Output
Section
(Bo rd
A2
or
A5)
Power
Supply
(Bo rd
A3)
INSTALLATION
Unp cking
Mech nic l
Inst ll tion
nd
Oper tion
Consider tions
Power
Source
Electric l
Connections
III
3-1
3-2
3-3
3-4
I
1-1
1-2
1-3
1-4
1-5
1-6
II
2-1
2-2
2-3
2-4
IV
4-1
4-2
4-3
4-4
4-5
4-6
V
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-5
5-5
5-9
TABLE
OF
CONTENTS
(cont)
Section
P ge
Title
7-1/7-2
•
VII
DRAWINGS
LIST
OF
ILLUSTRATIONS
Fig.
No.
Title
P ge
1-3
1-4
1-4
1-4
3-0
3-1
FM
Volum x
Controls
5-0
5-1
ii
2-2
2-3
2-5
2-6
2-1
2-1
2-2
2-3
4-1
4-2
FM
Volum x
Autom tic
Pe k
Controller
Are
of
Potenti l
FM
Overmodul tion
(75-ps
Pre-Emph sis
Curve)
Di gr m
nd
Oscilloscope
Photos
Showing
Audio
Pe k
Levels
of
Cymb l
Cl sh
with
nd
with
out
Pre-
Emph sis
Simplified
Block
Di gr m,
FM
Volum x
Model
4100
Outline
Dr wing
(Sheet
1
of
2
Sheets)
Outline
Dr wing
(Sheet
2
of
2
Sheets)
Typic l
FM
Volum x
Inst ll tion
Block
Di gr m
Typic l
Attenu tor
for
FM
Volum x
Input
Line
(Schem tic
Di gr m)
FM
Volum x
Block
Di gr m
FM
Volum x
Amplitude
Response
Loc tions
of
Circuit
Bo rds
nd
Ch ssis
P rts
in
FM
Volum x
Unit
1-1
1-3
4-0
4-4
1-1
1-2
PARTS
LISTS
Gener l
Resistors
Diodes
nd
Tr nsistors
M nuf cturers'
N me
Abbrevi tions
M in
Assembly
(Model
4110
or
4100)
High
Frequency
Processor
Bo rd
Al
nd
A4
Input-Output
Bo rd
A2
nd
A
5
Power
Supply
nd
AGC
Bo rd
A3
Front
P nel
Assembly
A6
(Model
4110
or
4100)
VI
6-1
6-2
6-3
6-4
6-5
6-6
6-7
6-8
6-9
6-1
6-1
6-1
6-1
6-2
6-3
6-4
6-7
6-10
6-13
LIST
OF
ILLUSTRATIONS
(cont)
Title
Fig.
No-
P ge
7-7/7-8
7-3
7-9/7-10
7-4
LIST
OF
TABLES
T ble
No.
Title
P ge
iii
5-2
5-3
5-4
5-1
5-2
5-3
7-1
7-2
FM
Volum x,
Intern l
Interconnections
High
Frequency
Processor
Bo rd
Al
or
A4,
Schem tic
nd
P rts
Loc tion
Di gr ms
Input-Output
Bo rd
A2
or
A5,
Schem tic
nd
P rts
Loc tion
Di gr ms
Power
Supply-AGC
Bo rd
A3,
Schem tic
nd
P rts
Loc tion
Di gr ms
Complete
Test
Setup
for
Mon ur l
Model
4100
Complete
Test
Setup
for
Stereo
Model
4110
Att ck
Time
Test
W veform
Power
Supply
Volt ges
Typic l
Volt ges
FM
Volum x
M inten nce
Tests
nd
Adjustments
5-27
5-28
5-29
7-3/7-4
7-5/7-6
5-7
5-7
5-11
SECTION
I
INTRODUCTION
1-1.
GENERAL
This
m nu l
provides
instructions
for
the
CBS
L bor tories
Model
4100
trollers.
These
instruments
h ve
been
designed
for
use
in
FM
nd
TV
bro dc st
ing
pplic tions
in
which
the
use
of
pre-emph sis
is
m nd tory.
Either
instrument
will
en ble
the
full
modul tion
c p bility
of
the
tr nsmitter
to
be
utilized
with
no
risk
of
overmodul tion.
It
repl ces
ny
limiter
or
clipper
th t
m y
now
be
in
use.
When
used
with
SCA**
systems,
it
prevents
crosst lk
c used
by
overmodul tion
from
entering
into
dj cent
ch nnels.
It
should
be
oper ted
with
well-controlled
udio
input
levels
such
s
provided
by
the
CBS
L bor tories
Audim x*
utom tic
level
control.
a
s
•
q
*
C®'
Figure
1-1.
FM
Volum x
Autom tic
Pe k
Controller
1-1
FM
VOLUMAX
*
**
CBS
L bor tories
Tr dem rk
Subc rrier
Authoriz tion
(Mon ur l)
nd
Model
4110
(Stereo)
FM
Volum x*
utom tic
udio
pe k
con-
INTRODUCTION
1-2.
FUNCTIONAL
DESCRIPTION
The
Models
4100
nd
4110
re
l te
designs
b sed
on
the
found tion
est blished
in
the
e rlier
Model
410
FM
Volum x
unit.
They
extend
the
origin l
technology
to
yield
cle ner,
brighter
sound
while
still
ret ining
bsolute
protection
g inst
overmodul tion.
A
very
f mili r
problem
in
FM
nd
TV
bro dc sting
is
c used
by
the
m nd tory
75-ps
pre-emph sis
curve
(fig.
1-2).
This
is
long
est blished
requirement
of
the
FCC
for
the
improvement
of
the
over ll
sign l-to-noise
r tio.
At
the
time
the
FM
nd
TV
bro dc sting
st nd rds
were
dopted,
the
long-term
ver ge
spectr l
distribution
of
music
sign ls
showed
ste dy
decline
with
frequency
bove
1,
000
Hz.
This
me nt
th t
high-frequency
pre-emph sis
with
subsequent
de-emph sis
t
the
receiver
could
be
employed
to
improve
the
over
ch nges
in
recording
techniques
in
conjunction
with
soci l
ch nges
in
music l
style
h ve
led
to
incre sing
problems
with
the
overmodul tion
c used
by
high-
mplitude
high-frequency
progr m
sign ls.
The
FM
Volum x
unit
solves
this
problem
uniquely
by
qu druple- ction
independently
processed
nd
over ll,
inst nt neous,
fin l
limiting
is
used
to
PHYSICAL
DESCRIPTION
1-3.
The
Models
4100
nd
4110
FM
Volum x
units
re
housed
in
the
s me
new
slimline
p ck ges
s
the
CBS
L bor tories
Audim x
nd
AM
Volum x
units.
1-2
ssure
th t
no
overmodul tion
will
occur.
See
lso
figures
1-3
nd
1-4.
ll
sign l-to-noise
r tio.
However,
in
recent
ye rs,
improvements
nd
other
control.
Low-,
middle-,
nd
high-frequency
portions
of
the
progr m
w ve
re
INTRODUCTION
MODULATION
18
800%
16
14
400%
12
200%
4
2
0
100%
20
20000
1-3
i
5
I
2
I
5
I
2
1
5
Figure
1-2.
Are
of
Potenti l
FM
Over
modul tion
(75-ps
Pre-Emph sis
Curve)
i
11
100
i
11
10
I
11
1000
10
db
8
INTRODUCTION
9dB
pre-emphasis
OdB
bove
5KHz
below
5KHz
>
1-4
Figure
1-3.
Di gr m
nd
Oscilloscope
Photos
Showing
Audio
Pe k
Levels
of
Cymb l
Cl sh
with
nd
without
Pre-Emph sis
Figure
1-4.
Simplified
Block
Di gr m,
FM
Volum x
Model
4100
active
filters
high
frequency
processor
Summation
Network
low
frequency
control
pre
emphasis
dynamic
i
frequency
compensator
final
limiting
INTRODUCTION
This
p ck ge
requires
only
1-3/4
inches
of
height
in
st nd rd
19-inch
r ck
circuitry
is
function lly
p ck ged
on
three
circuit
bo rds
in
the
mon ur l
re
equipped
with
ppropri te
test
points
to
speed
the
process
of
m inten nce
tests
or
troubleshooting
procedures.
The
entire
unit
slides
forw rd
on
r ck
slides
for
e sy
servicing
without
disconnections
from
the
tr nsmitting
system.
Front
p nel
controls
re
conveniently
rr nged
nd,
in
the
stereo
unit,
re
grouped
ccording
to
ch nnel--
left
ch nnel
controls
on
the
left
of
the
unit
nd
right
ch nnel
controls
on
the
right
of
the
unit.
A
front
p nel
meter
indic tes
the
rel tive
degree
of
g in
re
duction.
The
unit
c n
be
oper ted
from
either
115-volt
or
230-volt
single-ph se
50-
or
60-Hz
power
source.
On
delivery,
the
unit
is
wired
for
115-volt
oper -
Wiring
ch nges
for
230-volt
oper tion
re
expl ined
in
p r gr ph
2-3.
tion.
1-4.
WARRANTY
A
st nd rd
w rr nty
c rd
h s
been
included
with
your
FM
Volum x
unit.
To
v lid te
your
w rr nty,
complete
nd
return
the
postc rd
section
to
CBS
L bor tories
s
soon
s
possible.
SERVICE
AND
REPAIR
1-5.
If
there
is
difficulty
in
oper ting
or
m int ining
your
FM
Volum x
unit,
c ll
on
your
loc l
uthorized
distributor
from
whom
you
origin lly
purch sed
the
1-5
unit.
If
you
do
not
know
the
n me
nd
ddress
of
your
loc l
distributor,
c ll
FM
Volum x
model
nd
on
five
circuit
bo rds
in
the
stereo
model.
Both
models
nd
18-1/2
inches
of
depth
behind
the
front
p nel.
The
reli ble
solid-st te
INTRODUCTION
CBS
L bor tories,
Profession l
Products
Dep rtment,
St mford,
Conn.,
06905,
telephone
(203)
327-2000.
1-6.
SPECIFICATIONS
Input
imped nce
Output
imped nce
-22
dBm
to
+8
dBm
Input
level
25
dBm
M ximum
output
level
Frequency
response
H rmonic
distortion
Att ck
time
Recovery
time
Sign l-to-noise
r tio
Gre ter
th n
70
dB
Within
1/2
dB
Amplitude
Ph se
Within
1.
5
degrees
+55°C
(+130°F)
1-6
Tr cking
ccur cy
(stereo
model):
M ximum
oper ting
temper ture
±1
dB,
50
-
15,
000
Hz
below
limiting
threshold.
V ri ble
s
function
of
level
bove
limiting
threshold,
re ching
the
75-p.s
de-emph sis
ch r cteristic
±1
dB
t
m ximum
level
600
ohms,
b l nced
or
unb l nced;
10
kilohms
or
150
ohms
v il ble
on
request
Between
1
qs
nd
2
ms,
depending
on
progr m
w veform
200
ms
(low
frequencies)
5
ms
(middle
frequencies)
1
qs
or
less
(high
frequencies)
600
ohms,
flo ting
or
single
ended;
150
ohms
v il ble
on
request
Less
th n
1%,
below
threshold
of
limiting,
50
-
15,
000
Hz
INTRODUCTION
Power
requirements
:
Dimensions
Shipping
weight:
Mon ur l
model
13
pounds
14
pounds
Stereo
model
1-7
1-3/4
inches
high,
18-1/2
inches
deep;
fits
st nd rd
19-inch
r ck
with
univers l
hole
sp cing
12
w tts,
115/230
v c,
50/60
Hz
(mon ur l)
15
w tts,
115/230
v c,
50/60
Hz
(stereo)
SECTION
II
INSTALLATION
2-1.
UNPACKING
C refully
unp ck
your
FM
Volum x
unit
nd
ex mine
it
for
evidence
of
cl im
immedi tely
with
the
tr nsport tion
c rrier.
If
future
tr nsport tion
of
the
unit
c n
be
expected,
s ve
the
shipping
c rton
for
re-use.
MECHANICAL
INSTALLATION
AND
OPERATIONAL
CONSIDERATIONS
2-2.
The
FM
Volum x
unit
is
shipped
with
p ir
of
r ck
slides
which
help
to
ensure
st ble
mounting
in
the
r ck
nd
permit
e sy
ccess
to
the
intern l
p rts
of
the
unit
if
servicing
should
be
necess ry.
A
me ns
of
mounting
the
slides
to
the
r ck
is
det iled
in
figure
2-1.
The
unit
nd
its
slides
re
designed
to
be
mounted
in
st nd rd
19-inch
electronic
equipment
r ck
with
univers l
hole
sp cing.
The
front
p nel
requires
1-3/4
inches
of
sp ce
in
the
height
dimension,
nd
18-1/2
inches
of
depth
behind
the
front
p nel
re
needed
for
the
ch ssis.
As
for
ll
tr nsistor
equipment,
the
unit
must
be
inst lled
in
re son bly
well
ventil ted
position
with
no
high-
he t-producing
equipment
bene th
it.
CAUTION
The
mbient
temper ture
should
not
exceed
130°F
(55°C).
Telco
line
is
used
to
link
the
stu'dio
nd
tr nsmitter
sites,
the
FM
Volum x
unit
is
norm lly
inst lled
t
the
tr nsmitter
site,
immedi tely
before
the
udio
input
2-1
Figure
2-2
is
block
di gr m
of
recommended
inst ll tion.
When
d m ge
th t
m y
h ve
occurred
in
shipment.
In
the
event
of
d m ge,
file
INSTALLATION
I
1.250
Hl
___ ____
lh
fl
0
IB.
2
fl
fl
‘
S1
ra
-----
1.00
n.oo
19.00
*»VT
o
o
CBS
LAQQUKTOMiey
2-2
fl
fl
Figure
2-1.
Outline
Dr wing
(Sheet
1
of
2
Sheets)
D
D
D
0
-
LINE
CORD
.5
FT
LG
©
¥
0
fM
VOLUMAX
4110
r
3
4
MAX
J
TVP
j
. 3
.SS
7
^-NAMEPLATE
@
■
&
'^-OMIT
ON
MODEL
4100
(.MONO)
\
(TB2
REF)
rs
“
;r
H
-
Z5
L7I8-
015
INSTALLATION
2-3
RACK
DRILL
OUT
TAPPED
HOLES
IN
RACK
TO
ACCOMMODATE
USE
OF
MOUNTING
PLATE.
Figure
2-1.
Outline
Dr wing
(Sheet
2
of
2
Sheets)
MOUNTING
PLATE
(SUPPLIED
WITH
SLIDE)
To
i
JI
I
I
i
:
i
,
INSTALLATION
termin ls
of
the
tr nsmitter.
The
FM
Volum x
unit
h s
sufficient
g in
to
correct
for
long-line
nd
equ lizer
losses.
However,
if
pre-emph sized
microw ve
STL*
is
used,
the
FM
Volum x
unit
should
precede
the
STL
tr nsmitter.
It
should
be
remembered
th t
the
function
of
the
FM
Volum x
unit
is
for
progr m
line.
Optimum
oper tion
will
be
obt ined
when
the
FM
Volum x
unit
is
supplied
with
uniform
input
levels
such
s
those
produced
by
the
CBS
L bor tories
Audim x
unit
or
other
high-qu lity
utom tic
g in
control.
Input
levels
s
low
s
-24
dBm
c n
be
ccommod ted.
If
high
input
levels
re
used
--
s
will
be
the
c se
when
n
FM
Volum x
unit
is
connected
"H"
shown
in
figure
2-3
should
be
inserted
immedi tely
he d
of
the
FM
Volum x
unit.
2-3.
POWER
SOURCE
The
FM
Volum x
unit
is
equipped
with
power
tr nsformer
which
for
115
v c
oper tion.
If
230
v c
oper tion
is
desired,
m ke
the
following
modific tions
t
the
intern l
termin l
strip
TB1
t
the
re r
of
the
unit
next
to
the
re r
p nel.
Remove
the
bl ck/white
le d
from
termin l
4
of
TB1.
A.
Remove
the
brown
nd
white
le ds
from
termin l
5
of
TB1.
B.
*
Studio-Tr nsmitter
Link.
2-4
permits
either
115
v c
or
230
v c
oper tion.
As
delivered,
the
unit
is
wired
immedi tely
fter
n
Audim x
unit
--
fixed
ttenu tor
p d
such
s
the
"T"
or
th t
of
pe k
protection;
this
unit
should
not
be
used
s
"g in
riding"
device
EQUALIZED
LINE
■>
ooooo
FM
VOLUMAX
FM
TRANSMITTER
AUDIMAX
CONSOLE
to
I
cn
I
I
DISTRIBUTION,
MONITOR,
ETC
09
C
RS
to
I
to
p
3
s
>
r
r
>
5
TELEPHONE
COMPANY
INTERFACE
I
I
I
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V
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1
niinud
I
■<
o
°
o
£
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p
£
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§
INSTALLATION
A/w
AAA
o
-o
430
OHMS
430
OHMS
o-
o
A.
SYMMETRICAL
"T"
IGdB
PAD,
000HMS
IN/OUT
o- -o
AAV
AAV
■o
o
220
OHMS
220
OHMS
8.
SYMMETRICAL
"
h
"
I d8
PAD,
00
OHMS
IN/OUT
2-6
Figure
2-3.
Typic l
Attenu tor
for
FM
Volum x
Input
Line
(Schem tic
Di gr m)
—
AAA,
------
220
OHMS
—
AAA
-----
220
OHMS
<200
OHMS
>200
OHMS
INSTALLATION
C.
D.
ELECTRICAL
CONNECTIONS
2-4.
The
10-termin l
strip
TB2
t
the
re r
of
the
ch ssis
is
used
for
ll
input
nd
output
connections
to
the
EM
Volum x
unit.
Use
pins
1
nd
2
for
the
mon ur l
oh
left-ch nnel-stereo
input
nd
pins
4
nd
5
for
the
corresponding
output.
Simil rly,
for
the
stereo
model,
use
pins
6
nd
7
for
the
input
to
the
To
m int in
correct
stereophonic
ph sing
(stereo
model),
the
sign ls
t
termin ls
1
nd
6
should
be
in
ph se
when
mon ur l
sign l
is
pplied.
Sign ls
t
termin ls
4
nd
9
will
then
lso
be
in
ph se.
If
the
FM
Volum x
unit
is
termin ted
with
n
unb l nced
lo d,
termin ls
4
nd
9
should
be
used
s
the
"high"-side
termin ls,
nd
termin ls
5
nd
10
should
be
used
for
the
common
connections.
The
st nd rd
FM
Volum x
unit
is
wired
for
600-ohm
oper tion.
If
150-
In
ny
c se,
termin te
outputs
ohm
oper tion
is
desired,
consult
the
f ctory.
in
their
ch r cteristic
imped nces.
Input
imped nce
m y
be
converted
to
150
ohms
by
ch nging
A2R5
( nd
A5R5
in
the
stereo
model)
to
150
ohms.
2-7
,
Connect
the
brown,
white,
nd
bl ck/white
le ds
together
nd
sleeve
the
connection.
Repl ce
the
origin l
fuse
with
type
3AG-0.
15
mp
(SLO-BLO).
right
ch nnel
nd
pins
9
nd
10
for
the
right-ch nnel
output.
Pins
3
nd
8
re
ch ssis
grounds
.
OPERATIONAL
SET-UP
aa
INPUT
OUTPUT
Figure
3-1.
FM
Volum x
Controls
3-0
CB^LABO
ha
TOHE3
c
a
n
GAIN
REDUCTION
METER
TEST
SWITCH
a
a
RIGHT
CHANNEL
LEVEL
CONTROLS
(MODEL
4110
ONLY)
a
a
i
a
&
'
v
POWER
POWER
,
INPUT
OUTPUT
,
SWITCH
INDICATOR
--------------
J-
---------
'
LEFT
CHANNEL
OR
MONOPHONIC
LEVEL
CONTROLS
XL
u
u
u
u
u
u
u
a
a
g
a
a
a
a
a
SECTION
III
OPERATIONAL
SET-UP
GENERAL
3-1.
All
of
the
necess ry
oper tion l
controls
re
loc ted
on
the
front
of
the
output
controls
for
the
left
ch nnel
re
loc ted
t
the
left
of
the
meter
nd
input
nd
output
controls
for
the
right
ch nnel
re
loc ted
t
the
right
of
the
meter.
In
the
mon ur l
version,
ll
controls
re
loc ted
t
the
left
of
the
meter,
nd,
in
either
model,
the
power
switch
is
loc ted
t
the
extreme
left
end
of
the
front
p nel.
A
switch
to
control
n
intern l
bro d-b nd
limiter
is
loc ted
on
the
left
side
of
the
front
p nel
in
either
model.
The
g in
reduction
meter
in
the
center
of
the
p nel
me sures
the
mount
of
bro d-b nd
g in
reduction
nd
should
be
used
s
gener l
guide
in
djusting
the
input
level
controls.
SET-UP
OF
STEREO
FM
VOLUMAX
UNIT
3-2.
After
ll
electric l
connections
h ve
been
m de
s
in
Section
II,
A.
POWER
switch
up.
Le ve
the
TEST
switch
down.
Apply
400-Hz
left
ch nnel
sine-w ve
t
norm l
reference
level
B.
REDUCTION
meter
deflection
to
the
red/green
junction.
Move
the
TEST
switch
up
to
the
TEST
position
nd
turn
the
left
C.
OUTPUT
level
control
clockwise
s
f r
s
necess ry
to
produce
the
m ximum
This
step
provides
precise
setting
of
the
desired
left
ch nnel
modul tion.
3-1
to
the
FM
Volum x
unit.
Adjust
the
left
INPUT
level
control
for
GAIN
FM
Volum x
unit
s
shown
in
Figure
3-1.
In
the
stereo
version,
input
nd
turn
the
INPUT
nd
OUTPUT
level
controls
fully
counterclockwise.
Be
sure
both
outputs
re
termin ted
in
their
ch r cteristic
imped nces.
Push
the
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