RTS Systems PS8 User manual
TECHNICAL
MANUAL
TM2809
/
0/N
9300-2809-00
Third
Edition
/
October,
1988
MODEL
PS8
Power
Supply
O/N
9010-2732-00
TW
INTERCOM
SYSTEM
RTS
SYSTEMS,
INCORPORATED
1100
West
Chestnut
Street
/
Burbank,
California
91506
/
Phone
818/566-6700
/
FSCM;
60572
TECHNICAL
MANUAL
Model
PS8
Power
Supply
a
PROPRIETARY
NOTICE
The
information
and
design
disclosed
herein
were
originated
by
and
are
the
property
of
RTS
Systems,
Inc.
RTS
Systems,
Inc.
reserves
all
patent,
proprietary
design,
manufacturing,
reproduction,
use
and
sales
rights
thereto,
and
to
any
article
disclosed
therein,
except
to
the
extent
rights
are
expressly
granted
to
others.
UNPACKING
INFORMATION
AND
INSPECTION
Immediately
upon
receipt
of
the
equipment,
inspect
the
shipping
container
and
the
contents
carefully
for
any
discrepancies
or
damage.
Should
there
be
any,
notify
the
freight
company
and
the
dealer
at
once.
The
shipping
Model
PS8
container
should
contain
the
following
components:
COPYRIGHT
NOTICE
Copyright
1988
by
RTS
Systems,
Inc„
Reproduction
in
whole
or
m
part
without
prior
written
permission
from
RTS
Systems,
Inc.
is
prohibited.
TECHNICAL
MANUAL
TM
2809
MODEL
PS8
POWER
SUPPLY
Ordering
Number
9010-2732-00
RTS
Systems
XUy
£arl..Number
1
9010-2732-00
l
9300-2809-00
1
9110-2044-02
1
9110-1609-02
4
description
Model
PS8
Instruction
Manual
Large
Rack
Ear
Small
Rack
Ear
Rubber
Feet
Printing
History:
First
Edition
September,
1981
j
Second
Edition
July,
1986
Third
Edition
October,
1988
This
manual
is
published
by
the
engineering
department
of
RTS
Systems,
Inc,
f
which
is
responsible
for
its
contents.
Written
by:
Dan
Register
Edited
by:
Kent
Power
Lianne
Sterling
Swanson
Address
all
communication
regarding
this
publication
to:
Director
of
Engineering
RTS
Systems,
Inc.
1100
West
Chestnut
Street
Burbank,
CA
91506
QUICK
TABLE
OF
CONTENTS
Unpacking
Information
Table
Of
Contents
iii
Warranty,.
v
j
Shipping
Information
.
v
i
Description
&
Specifications
*^.,....*.1-1
Installation
Operating
Instructions.....
3-1
Theoiy
Of
Operation...
Maintenance..............
Lists
Or
Replaceable
P^rts.6-1
Drawings...
™
..7-l
(,
'
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM;
60572
/
TM2809
/
Third
Edition,
October
1988
Page
ii
TECHNICAL
MANUAL
Model
PS8
Power
Supply
TABLE
OF
CONTENTS
Unpacking
Information
Table
Of
Contents,,,,.
Warranty.
Shipping
Information....
ii
iii
vi
vi
SECTION
1:
INTRODUCTION
AND
SPECIFICATIONS
RefJNa,
Title
1.1
1.2
1.3
1.4
1.5
1.6
Introduction.,....
Powering...
Dual
Audio
Impedance.
Connections.
Package
.
PS8
Specifications..
Page
....
1-1
....
1-1
..,,
1
-
1
"
1-1
...
1-1
.,.
1
-2
SECTION
2:
INSTALLATION
Ref
No,
Title
2.1
Mechanical
Installation.
2.2
Outputs
..
23
Power
and
Input
power
Selection,
2.3.1
115/230
Conversion
Switch.
23.2
External
Fuse..
233
Internal
Fuse
..„
23,4
Power
Indicator
.
SECTION
3;
OPERATION
Ref
.
,
N
o.,
ms
3.0
Introduction,.,.,.
3.1
Front
and
Back
Panel
Controls
3.2
Tandem
Operation....,,,...,.
Pane
....
2
-1
....
2
-1
„„2-l
....
2
-1
.,,,
2
-1
.,,,
2
-1
Z.2-1
.,,.3-1
.,,*3-1
Z.3-6
SECTION
4:
THEORY
OF
OPERATION
Ref.
No.
Title
Pa
^
e
4.1
General
Overview....*.......4-1
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2S09
/
Third
Edition,
October
1988
TECHNICAL
MANUAL
Model
PSS
Power
Supply
TABLE
OF
CONTENTS
(Continued)
SECTION
S:
MAINTENANCE,
TEST
PROCEDURE
&
TROUBLESHOOTING
Ref.
No,
Title
5.0
5.1
5.2
5.2.1
5
-
2.2
5,23
5.3
5.3.1
5.4
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.6
Introduction..
Warranty
Information..
General
Maintenance
.
Safety
Considerations.
Access
.
Cleaning.
Input
Power
Selection..
Fuse
Replacement...
Test
Procedure
Set
Up.
Test
Procedure.,....,..
Initial
Inspection..
Safety
Check....
Power
Supply..
Performance
Check,.......,.,..
PSS
Troubleshooting
Chart
Page
..,5-1
...5-1
™
s
-i
...5-1
...5-1
...5-1
...5-1
5-3
..5-3
...5-3
..5-3
..5-3
,.5-3
.,5-5
SECTION
6:
LISTS
OF
REPLACEABLE
PARTS
Rgf.No.
Title
Pgge
6.1
Introduction...,^,...*..,^..
4
.
.
.
6.1.1
Division
Of
Parts
List
Into
Sub-Parts
Lists....*..
6-1
6.2
How
To
Obtain
Farts.6-1
63
Shipping
List.,..*........*.*.6-1
6*4
FS8
Final
Assembly..*.............6-2
6.5
PSS
Back
Panel
Assembly
..*.......6-2
6.6
PS8
Printed
Circuit
Board
Assembly..,*....*-....*.
4
.
.
.
6-2
SECTION
7:
DRAWINGS
AND
APPENDICES
Title
(Drawing
Number)
Page
Schematic*
Model
PSS
(SD2717),„„............„„,7-2
Assembly
Diagram,
Printed
Circuit
Board
Board
(AS2717)...7-3
Model
PSS
Mounting
Options.*............
.
.
.
.
.
.
.
.
7
-4
Model
PSS
Installation
Drawing
(ID4G34)........7-5
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
iv
TECHNICAL
MANUAL
Model
PS8
Power
Supply
INDEX
OF
FIGURES
2-1
Outline
Drawing,
Mounting
Options.
2-
2
Outline
Drawing,
Model
PS8
Power
Supply.
3-
1
Model
PS8
Front
Panel.,...*.*...*.***.,*..*.*.
3-2
Model
PS8
Rear
Panel.*
.
*.
3-3
Model
PS8
Capacity,
Local.
3-4
Model
PS8
Capacity,
Long
Distance*.*...*.*
.
.
.
.
.
3-
5
Model
PS8
Tandem
Operation
Configuration
.
4-
1
Model
PS8
Block
Diagram.*..*...
5-
1
PS8
Test
Fixture.
2age
,...1-3
..,,
2
-2
...
3-2
...
3-3
...3-4
...3-5
...3-6
...4-2
...5-2
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
v
TECHNICAL
MANUAL
Model
PS8
Power
Supply
RTS
SYSTEMS*
LIMITED
WARRANTY
The
products
of
RTS
Systems,
Inc.,
a
California
corporation,
are
warranted
to
be
free
from
defects
in
materials
and
workmanship
for
a
period
of
one
year
from
the
date
of
sale.
RTS
Systems*
sole
obligation
during
the
warranty
period
is
to
provide,
without
charge,
parts
and
labor
necessary
to
remedy
covered
defects
appearing
in
products
returned
prepaid
to:
RTS
Systems,
1100
W.
Chestnut
Street,
Burbank,
California,
91506,
U.SA„
This
warranty
does
not
cover
any
defect,
malfunction
or
failure
caused
beyond
the
control
of
RTS
Systems,
including
unreasonable
or
negligent
operation,
abuse,
accident,
failure
to
follow
instructions
in
this
Manual,
defective
or
improper
associated
equipment,
attempts
at
modification
and
repair
not
authorized
by
RTS
Systems,
and
shipping
damage.
Products
with
their
serial
numbers
removed
or
effaced
are
not
covered
by
this
warranty.
To
obtain
warranty
service,
follow
the
procedures
entitled
"PROCEDURE
FOR
RETURNS"
and
"SHIPPING
TO
MANUFACTURER
FOR
REPAIR
OR
ADJUSTMENT"
listed
below.
This
warranty
is
the
sole
and
exclusive
express
warranty
given
with
respect
to
RTS
Systems'
products.
It
is
the
responsibility
of
the
user
to
determine
before
purchase
that
this
product
is
suitable
for
the
user's
intended
purpose.
ANY
AND
ALL
IMPLIED
WARRANTIES,
INCLUDING
THE
IMPLIED
WARRANTY
OF
MERCHANTABILITY
ARE
LIMITED
TO
THE
DURATION
OF
THIS
EXPRESS
LIMITED
WARRANTY.
NEITHER
RTS
SYSTEMS
NOR
THE
DEALER
WHO
SELLS
RTS
SYSTEMS*
PRODUCTS
IS
LIABLE
FOR
INCIDENTAL
OR
CONSEQUENTIAL
DAMAGES
OF
ANY
KIND.
RETURN
SHIPPING
INSTRUCTIONS
Procedure
for
returns:
If
repair
is
necessary,
contact
the
dealer
where
this
unit
was
purchased.
If
repair
through
the
dealer
is
not
possible,
contact
the
RTS
Systems
Customer
Service
Department
by
telephone,
as
directed
below,
to
obtain
a
Return
Authorization
Number.
DO
NOT
RETURN
ANY
EQUIPMENT
TO
THE
FACTORY
WITHOUT
FIRST
OBTAINING
A
RETURN
AUTHORIZATION
NUMBER.
Be
prepared
to
provide
your
company’s
name,
address,
phone
number,
a
person
to
contact
regarding
the
repair,
the
type
and
quantity
of
equipment,
a
description
of
the
defect,
and
the
serial
number(s).
Questions
regarding
returns
for
repair
should
be
directed
to:
Customer
Service
Department
RTS
Systems,
Inc.
1100
W.
Chestnut
St.
Burbank,
CA
91506,
U.S
A.
Telephone:
(818)
566-6700
TELEX:
194S55
TWX:
910498-4987
FAX:
(818)
843-7953
SHIPPING
TO
MANUFACTURER
FOR
REPAIR
OR
ADJUSTMENT
All
shipments
of
RTS
Systems,
Inc,
equipment
should
be
prepaid
via
United
Parcel
Service
or
the
best
available
shipper.
The
equipment
should
be
shipped
in
the
original
packing
carton;
if
not
available,
use
any
suitable
container
that
is
rigid
and
of
adequate
size.
If
a
substitute
container
is
used,
the
equipment
should
be
wrapped
in
paper
and
surrounded
with
at
least
four
inches
of
excelsior
or
similar
shock-absorbing
material.
All
shipments
should
be
directed
to
the
attention
of
the
Customer
Service
Department
and
must
include
the
Return
Authorization
Number.
Upon
completion
of
repairs
equipment
will
be
returned
via
United
Parcel
Service
or
specified
shipper,
collect.
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
vi
TECHNICAL
MANUAL
Model
PS8
Power
Supply
SECTION
1:
INTRODUCTION
AND
SPECIFICATIONS
1.1
INTRODUCTION
In
the
TW
Intercom
System,
the
power
supply
is
considered
the
heart
of
the
system.
The
Model
PS8
Power
Supply
is
designed
to
function
in
applications
employing
small-size
TW
Intercom
Systems.
The
unit
is
completely
self-contained
and
features
two-channel
operation;
one
Vet"
channel
with
32
volts
DC
and
one
"dry"
channel
without
voltage
potential.
Each
channel
provides
an
audio
termination
impedance
of
200
ohms.
The
Model
PS8
is
mechanically
and
electrically
built
to
industrial
quality
standards,
insuring
long-term
usage
and
performance.
Outputs
are
protected
against
short
circuit
conditions
with
recovery
being
automatic
and
instantaneous.
Protection
circuitry
prevents
damage
to
the
power
supply
from
accidental
connection
to
120
volt
AC
power
lines.
12
POWERING
A
single
PS8
Power
Supply
powers:
twelve
user
stations
without
call
lights,
seven
speaker
stations
without
call
lights,
seven
user
stations
with
call
lights,
or
five
speaker
stations
with
call
lights.
Of
course*
a
combination
of
stations
may
be
used
with
respect
to
maximum
current
capability.
See
Figure
3-3
and
Figure
3-4
for
Model
PS8
powering
capability.
If
still
more
user
stations
are
needed*
two
PS8
Power
Supplies
can
be
audio
coupled
together
to
double
the
powering
capability;
a
1/4-inch
3-circuit
phone
jack
is
available
for
this
purpose.
This
connector
can
also
be
used
as
a
one-way
output
port
when
monitoring
or
recording
the
intercom
audio
signals.
1J
DUAL
AUDIO
IMPEDANCE
When
two
P$8
T
s
are
combined,
an
impedance
select
switch
on
each
PS8
maintains,
in
effect,
the
200
ohm
Hue
termination
while
the
pair
of
units
provides
the
equivalent
current
of
what
would
be
approximately
a
FS20.
In
the
normal
position,
the
switch
sets
the
impedance
to
200
ohms
while
in
the
dual
position,
a
400
ohm
impedance
is
established.
The
parallel
combination
of
400
ohms
between
the
two
power
supplies
now
becomes
200
ohms:
the
nominal
line
impedance
for
the
TW
Intercom
System.
1.4
CONNECTIONS
There
are
two
XLR-type
3-pin
male
connectors
mounted
on
the
rear
panel
for
output
interconnection
to
the
user
stations.
(The
PS8
itself
does
not
have
program
insertion
capability).
IS
PACKAGE
The
PS8
is
housed
in
a
metal
enclosure
measuring
1.75
inches
high
by
8*38
inches
wide
by
7.5
inches
deep.
The
unit
is
completely
enclosed
and
may
be
used
free
standing,
or
rack
mounted.
All
electrical
components
are
assembled
on
a
single
circuit
board
allowing
easy
adjustment
or
servicing;
immediate
access
is
accomplished
by
removing
four
screws
and
sliding
the
top
and
bottom
covers
back
along
their
respective
channels.
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
TECHNICAL
MANUAL
Model
PS8
Power
Supply
i
1
i
i
i
i
!
i
i
i
i
i
i
1.6
PS8
SPECIFICATIONS
OUTPUTS:
One
powered
channel,
CHI
(audio
+
DC
+
200
ohm
audio
termination)
One
passive
channel,
CH2
(audio
+
200
ohm
audio
termination)
OUTPUT
VOLTAGE:
Nominal
open
circuit
+
32
volts,
+
0.5
V.-1.5
V
Full
load
+26
volts
OUTPUT
IMPEDANCE:
200/400
ohms
switchable
On
powered
channel:
200
ohms
is
maintained
from
17
to
32
volts
output
OUTPUT
CURRENT:
@
26
volts
0.4
amps
@
32
volts
0.5
amps
INTERCOM
AUDIO:
NOMINAL
LEVEL:
2.0
volts
p
p
MINIMUM
HEAD
ROOM
6
dB
minimum
TERMINATION:
200
or
400
ohms
+
10%
Both
channels
FREQUENCY
RESPONSE:
75
Hertz
to
20
KHz
*3
dB,
no
load
SIGNAL
TO
NOISE
RATIO:
55
dB
Ref.
2.0
V
peak-to-peak
TEMPERATURE:
Operating
0
to
+
50
Storage
-40
to
+70
POWER
REQUIREMENT:
24
volt-amps
(120/240
VAC,
50-60
Hz)
DIMENSIONS:
Height:
Width:
Depth:
Weight:
Finish:
1.75
inches
(43.62
mm)
8375
inches
(212.73
mm)
7.50
inches
(190.50
mm)
5
pounds
(2.25
kilograms)
Light
gray
enamel
paint
SPECIFICATION
NOTES:
0
dBu
=
0.775
r.m.s
All
production
information
and
specifications
are
subject
to
change
without
notice.
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
1-2
TECHNICAL
MANUAL
Model
PS8
Power
Supply
Stand-Alone
Single
Rack
Mount
Figure
2-1
Outline
Drawing,
Mounting
Options
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
TECHNICAL
MANUAL
Model
PS8
Power
Supply
SECTION
2:
INSTALLATION
2-1
MECHANICAL
INSTALLATION
(See
Figure
2-
1,
Outline
Drawing
Mounting
Options,
Figure
2-2,
Outline
Drawing,
and
Figure
7-3,
Installation
Diagram.)
The
Model
PS8
can
be
installed
in
3
ways.
A
single
unit
can
be
mounted
in
a
half
rack
space
using
the
rack
ears
provided;
or
two
PS8's
can
be
mounted
side
by
side
using
the
holes
provided
in
the
side
rail
along
with
the
short
rack
ears;
or
the
units
can
be
free
standing
using
the
stick-on
rubber
feet.
The
rack
ears
conform
to
standard
EIA
rack
sues
and
each
car
can
be
used
on
either
side
of
the
unit.
To
install
the
Model
PS8
first
select
the
configuration
to
use
in
your
application.
If
mounting
free
standing
place
the
stick-on
rubber
feet
on
the
bottom
of
the
unit
in
the
four
corners.
If
rack
mounting
carefully
remove
the
cover
of
the
unit
by
removing
the
screws
and
sliding
off
the
cover.
There
are
2
screws
on
each
side
rail
of
the
unit.
Remove
them.
Next
place
the
rack
ears
on
the
sides
of
the
unit
and
re-attach
the
screws
to
the
sidcrails.
The
nut
and
washer
go
on
the
inside
of
the
unit.
Be
careful
not
to
jar
or
strike
any
of
the
electronic
components
inside
of
the
unit.
If
using
two
units
side-
by-side
fasten
the
two
units
together
through
the
2
holes
on
the
common
side
of
each
unit;
then
attach
the
short
rack
ears
to
the
opposite
sides.
Now
re¬
attach
the
top
cover
and
fasten
the
unit
to
the
rack.
12
OUTPUTS
Located
on
the
back
panel
are
the
outputs.
The
PS8
is
designed
to
accept
standard
XLR
3-pin
female
connectors.
23
POWER
and
INPUT
POWER
SELECTION
Located
on
the
back
panel,
lower
left,
is
the
power
cord.
It
is
standard
18
gauge,
3
wire
cord,
6
feet
long
with
CEE
color
code.
It
has
a
standard
North
American
3
prong
plug.
the
two
4-40
phillips
head
screws
in
the
top
cover
and
sliding
the
cover
open.
WARNING:
SEE
SECTION
S3
CONCERNING
POTENTIAL
SHOCK
HAZARD!
233
EXTERNAL
FUSE
Located
on
the
back
panel,
upper
left,
is
the
external
fuse.
The
fuse
holder
is
a
standard
international
type
which
accepts
a
standard
1/4
inch
by
11/4
inch
AGC
or
3AG
slow-blow
fuse.
Refer
to
the
fuse
table
for
the
appropriate
fuse
size.
233
INTERNAL
FUSE
Mounted
on
the
P.C.
Board,
behind
the
external
fuse
is
the
internal
fuse.
To
gain
access,
remove
the
top
cover
by
unscrewing
the
screws
and
sliding
the
cover
open.
Refer
to
the
fuse
table
for
the
appropriate
fuse
size.
The
internal
fuse
is
used
as
a
secondary
safety
device.
It
is
one
fuse
larger
than
the
external
fuse.
If
the
external
fuse
is
blown
and
a
larger
fuse
is
put
into
its
place,
the
internal
fuse
will
blow
before
the
unit
is
destroyed.
If
the
fuses
keep
on
blowing,
the
unit
needs
servicing,
FUSE
TABLE
115
External
1/2
amp,
slow-blow
Internal
1
amp,
slow-blow
230
External
1/4
amp,
slow-blow
Internal
1/2
amp,
slow-blow
When
reinstalling
the
top
cover,
the
two
screws
must
be
installed
carefully
to
insure
a
good
ground
connection
between
the
cover
and
the
chassis.
23,4
POWER
INDICATOR
23.1
115/230
CONVERSION
SWITCH
Located
internally,
behind
the
external
fuse
and
mounted
on
the
P,C.
board
is
the
115/230
conversion
switch.
To
gain
access
to
this
switch,
the
top
cover
must
be
removed.
This
is
accomplished
by
removing
Located
on
the
front
panel,
bottom
right,
is
the
power-on
indicator.
It
is
a
green
light
emitting
diode
(LED).
RTS
Systems,
Inc,
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
2-1
WEIGHT:
4.0IBS
((.Sty)
Figure
2-2
Outline
Drawing,
Model
PS8
Power
Supply
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
TECHNICAL
MANUAL
Model
FS8
Power
Supply
SECTION
3:
OPERATING
INSTRUCTIONS
3.0
INTRODUCTION
The
operation
section
is
divided
into
two
parts:
Front
and
back
panel
description,
and
tandem
operation.
i
'
■
)
3.1
FRONT
AND
BACK
PANEL
DESCRIPTIONS
(See
Figures
3-1
and
3-2)
REF
NAME
FUNCTION
1
POWER
LED
"power
on"
indicator*
2
POWER
CORD
Goes
to
ac
line,
120
or
240
volts
switch
selected
inside.
3
FUSE
Fuse
holder.
Use
a
1/2
amp
slow-blow
fuse
for
120
volt
operation;
use
a
1/4
amp
slow-blow
fuse
for
240
volt
operation,
A
metric
fuse
carrier
is
available
to
fit
this
same
holder
4
AUDIO
COUPLING
A
1/4
inch
stereophonc
jack.
Provides
an
unbuffered
audio
output.
May
be
used
to
connect
two
PS-8*s
together,
5
OUTPUTS
3-pin
male
XLR-type
connectors.
These
feed
the
RTS
TW"
user
stations.
6
N
ORM
DUAL
SWITCH
A
toggle
switch.
Selects
200
or
400
ohm
impedance.
The
NORMal
position
is
used
when
the
power
supply
is
used
singly.
The
DUAL
position
is
used
when
two
PS-8
T
s
arc
connected
together
through
the
audio
coupling
jack.
i
\
)
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM28Q9
/
Third
Edition,
October
1988
Page
3-1
TECHNICAL
MANUAL
Model
PS8
Power
Supply
's
7
RTS
SYSTEMS
0
O
MODEL
PSa
POWEH
SUPPLY
POWER
z
_
■
—
Figure
3-1
Model
PS-8
Front
Panel
RTS
Systems,
Inc,
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
TECHNICAL
MANUAL
Model
PS8
Power
Supply
Figure
3-2
Model
PSS
Rear
Panel
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
3-3
BELT
PACKS
ft
TECHNICAL
MANUAL
Modd
PS8
Power
Supply
SPEAKER
STATIONS
Figure
3-3
Model
PS8
Capacity,
Local
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1.988
BELT
PACKS
TECHNICAL
MANUAL
Model
FS8
Power
Supply
Figure
3-4
Model
PS8
Capacity,
Long
Distance
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2SQ9
/
Third
Edition,
October
1988
Page
3-5
TECHNICAL
MANUAL
Model
PS8
Power
Supply
32
TANDEM
OPERATION
Two
units
can
be
used
in
tandem
to
power
up
to
16
non
speaker
user
stations-
See
Figure
3-5,
TANDEM
OPERATION
CONFIGURATION.
This
set
up
maintains
a
200
ohm
line
impedance
when
the
termination
switch
is
in
the
DUAL
position.
Each
PS8
provides
the
necessary
power
for
a
jp-oup
of
user
stations.
The
interconnect
cable
serves
to
couple
the
audio
signals
together.
This
configuration
now
acts
as
an
equivalent
would-be
FS16.
CAUTION:
If
more
than
16
stations
are
required,
a
PS30-type
POWER
SUPPLY
should
be
used.
EEAB
PAM
EL
gEAE
PAM
EL
XLS-
POWEe
FOG
©
XLE-POWEE
FOC
Figure
3-5
Model
PS8
Tandem
Operation
Configuration
RTS
Systems,
Inc.
Burbank,
GA
91506
/
FSCMt
60572
/
TM2809
/
Third
Edition,
October
1988
Page
3-6
TECHNICAL
MANUAL
Model
PS8
Power
Supply
)
SECTION
4:
THEORY
OF
OPERATION
4.1
GENERAL
OVERVIEW
The
Model
PS8
Power
Supply
consists
of:
a
raw
DC
power
supply
and
the
impedance-generating
electronics.
The
raw
DC
power
supply
consists
of
transformer
T1
which
steps
down
the
ac
mains
voltage
to
28
volts
rms.
Diodes
CR1-CR4
rectify
this
voltage
and
capacitor
C3
filters
out
the
ac
component,
leaving
40
volts
DC.
This
voltage
feeds:
the
impedance
generator/rcgulator
(U2)
which
provides
the
power
to
all
the
electronics.
Transformer
T1
is
protected
from
thermal
overload
by
S3
which
automatically
opens
when
the
temperature
reaches
a
set
point
and
automatically
closes
when
the
temperature
cools
to
a
set
point.
The
200
ohm
impedance
generator
consists
of
IC's
U1A
and
UlB
t
and
diode
CR14
which
serves
to
protect
the
internal
electronics
from
an
overvoltage
on
the
RTS
line*
)
RTS
Systems,
Inc.
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
4^1
TECHNICAL
MANUAL
Model
FS8
Power
Supply
INPUT
POWEH
CONNECTION
Figured!
Model
PSS
Block
Diagram
RTS
Systems*
Inc*
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
4-2
TECHNICAL
MANUAL
Model
PSS
Power
Supply
)
SECTIONS;
MAINTENANCE
5.0
INTRODUCTION
This
section
provides
service
information
for
normal
maintenance,
factory
performance
tests
and
troubleshooting
tips.
5*1
WARRANTY
INFORMATION
The
Model
PSS
Power
Supply
is
warranted
for
a
period
of
one
year
from
the
purchase
date.
A
copy
of
the
warranty
is
located
on
page
five.
S2
GENERAL
MAINTENANCE
These
servicing
instructions
are
for
qualified
personnel
only.
To
avoid
electric
shock,
do
not
perform
any
servicing
other
than
that
contained
in
the
operating
instructions
unless
qualified
to
do
so.
WARNING:
Disconnect
ac
power
before
servicing.
5.2.1
SAFETY
CONSIDERATIONS
Although
this
equipment
has
been
designed
in
accordance
with
international
safety
standards,
this
\
manual
contains
information,
cautions,
and
■
warnings
which
must
be
followed
to
ensure
safe
operation
and
to
maintain
the
equipment
in
safe
operating
condition.
Service
and
adjustments
should
be
performed
only
by
qualified
service
personnel.
Any
adjustment,
maintenance,
and
repair
of
the
opened
equipment
while
any
power
or
voltage
is
applied
should
be
avoided
as
much
as
possible,
and,
when
Inevitable,
should
be
carried
out
only
by
a
skilled
person
who
is
aware
of
the
hazard
involved.
WARNING
Any
interruption
of
the
protective
grounding
conductor
(inside
or
outside
the
equipment)
or
disconnection
of
the
protective
earth
is
likely
to
make
the
equipment
dangerous*
Intentional
interruption
of
the
protective
grounding
conductor
is
strictly
prohibited.
Be
certain
that
only
fuses
with
the
required
current
rating
and
of
the
specified
typc(normal
blow,
time
delay,
slow-blow,
etc.)
arc
used
for
replacement.
The
use
of
repaired
fuses
and
the
short-circuiting
of
fuse
holders
must
be
avoided.
WARNING
The
service
information
presented
In
this
manual
Is
normally
used
with
the
protective
covers
removed
and
power
applied
to
the
equipment
Energy
available
at
many
points
may,
if
contacted,
result
in
personal
injury.
5.2.2
ACCESS
To
get
inside
the
Model
PS3,
remove
the
screws
on
the
top
and
bottom
covers.
Slide
covers
off.
5.2.3
CLEANING
Clean
the
outside
of
the
Model
PSS
with
denatured
alcohol
or
a
mild
solution
of
detergent
and
water.
Clean
the
interior
with
dry,
low
pressure
air.
The
circuit
boards
can
be
cleaned
with
1,1,1
trichloroethane
or
Freon
TK
Do
not
allow
these
or
any
solvents
to
get
into
the
pots.
Caution;
follow
the
safety
instructions
on
the
solvent
containers.
5.3
INPUT
POWER
SELECTION
The
Model
PSS
is
designed
to
operate
on
100/120,
or
200/240
volts
AC
at
50/60
hertz.
To
convert
from
one
mains
voltage
to
another,
remove
covers
and
refer
to
Section
2.2.
NOTICE:
When
converting
to
200/240
volt
AC
power
input,
the
fuse
must
be
changed
to
1/4
ampere
s
low-blow.
53.1
FUSE
REPLACEMENT
To
replace
inside
fuse,
remove
covers.
Replace
only
with
the
recommended
fuse:
100/120
volt
AC
1
ampere
slow-blow
200/240
volt
AC
1/2
ampere
slow-blow
It
is
possible
for
capacitors
inside
the
equipment
to
still
be
charged
even
if
the
equipment
has
been
disconnected
from
its
power
source.
RTS
Systems,
Inc,
Burbank,
CA
91506
/
FSCM:
60572
/
TM2809
/
Third
Edition,
October
1988
Page
54
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