CLEAR-COM ENCORE
PS-702 TWO-CHANNEL POWER SUPPLY
INSTRUCTION MANUAL
PS-702 Two-Channel Power Supply Instruction Manual
Part Number 810493Z Rev. 3
Legal Disclaimers
Copyright © 2013 HME Clear-Com Ltd.
All rights reserved.
Clear-Com, the Clear-Com logo, and Clear-Com Concert are trademarks or registered trademarks of HM Electronics, Inc.
The software described in this document is furnished under a license agreement and may be used only in accordance with the
terms of the agreement.
The product described in this document is distributed under licenses restricting its use, copying, distribution, and decompilation/
reverse engineering. No part of this document may be reproduced in any form by any means without prior written authorization
of Clear-Com, an HME Company.
Clear-Com Offices are located in California, USA; Cambridge, UK; Montreal, Canada; and Beijing, China. Specific addresses
and contact information can be found on Clear-Com's corporate website:
www.clearcom.com
Clear-Com Contacts
Americas and Asia-Pacific Headquarters
California, United States
Tel: +1.510.337.6600
Email: CustomerServicesUS@clearcom.com
Europe, Middle East, and Africa Headquarters
Cambridge, United Kingdom
Tel: +44 1223 815000
Email: SalesSupportEMEA@clearcom.com
Canada Office
Quebec , Canada
Tel: +1 (450) 653-9669
China Office
Beijing Representative Office
Beijing, P.R.China
Tel: +8610 65811360 / 65815577
CONTENTS
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Fail Safe Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Front and Rear Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Intercom Line Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Line Termination (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Program Input (Rear Panel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Rack Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
System Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Check Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Check Intercom Cable Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Final Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Troubleshooting Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
PS-702 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . 4-1
PS-702 Two-Channel Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
LIMITED WARRANTY. . . . . . . . . . . . . . . . . . . . . . . . . . 6-I
Warranty Period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-i
Technical Support. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-i
Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-ii
Non-Warranty Repairs and Returns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-ii
Extended Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-ii
Service Contract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-iii
Liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-iii
PS-702 TWO-CHANNEL POWER
i
ii
PS-702 TWO-CHANNEL POWER SUPPLY
Please read and follow
these instructions before
operating this product.
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug.
A polarized plug has two blades, with one wider than the other. A
grounding-type plug has two blades and a third grounding prong. The
wide blade or the third prong are provided for your safety. If the provided
plug does not fit into your outlet, consult an electrician for replacement of
the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at
plugs, convenience receptacles, and the point where they exit from the
apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specified by the
manufacturer, or sold with the apparatus. When a cart is used, use caution
when moving the cart/apparatus combination to avoid injury from
tip-over.
13. Unplug this apparatus during lightning storms or when unused for long
periods of time.
14. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as power-supply
cord or plug is damaged, liquid has been spilled or objects have fallen into
the apparatus, the apparatus has been exposed to rain or moisture, does
not operate normally, or has been dropped.
15. WARNING: To reduce the risk of fire or electric shock, do not expose
this product to rain or moisture.
Please familiarize yourself with the safety symbols in Figure 1. When you
see these symbols on this product, they warn you of the potential danger
of electric shock if the main station is used improperly. They also refer
you to important operating and maintenance instructions in the manual.
PS-702 TWO-CHANNEL POWER SUPPLY
iii
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
This symbol alerts you to the presence of uninsulated dangerous
voltage within the product's enclosure that might be of sufficient
magnitude to constitute a risk of electric shock. Do not open
the product's case.
This symbol informs you that important operating and maintenance instructions are included in the literature accompanying
this product.
Figure 1: Safety Symbols
EMC AND SAFETY
The PS-702 Two-Channel Power Supply meets all relevant CE, FCC, UL,
and CSA specifications set out below:
EN55103-1 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 1: Emissions.
EN55103-2 Electromagnetic compatibility. Product family standard for
audio, video, audio-visual, and entertainment lighting control apparatus
for professional use. Part 2: Immunity.
UL 60065-7, CAN/CSA-C22.2 No.60065-3, IEC 60065-7 Safety
requirements.
And thereby compliance with the requirement of Electromagnetic
Compatibility Directive 2004/108/EC and Low Voltage Directive
2006/95/EC
This device complies with Part 15 of the FCC Rules. Operation is subject
to the following two conditions: (1) this device may not cause harmful
interference, and (2) this device must accept any interference received,
including interference that may cause undesired operation.
iv
PS-702 TWO-CHANNEL POWER SUPPLY
OPERATION
INTRODUCTION
Congratulations on choosing this Clear-Com product. Clear-Com was
established in 1968 and remains the market leader in providing intercoms for
entertainment, broadcast and industrial applications. The ruggedness and high
build-quality of Clear-Com products defines the industry standard. In fact,
many of our original beltpacks and main stations are still in daily use around
the world.
The PS-702 power supply is a powerful, yet user-friendly unit that can serve
as the heart of a Clear-Com system.We recommend that you read through this
manual completely to better understand the functions of the PS-702 and how
to optimize your system setup.
Please pay particular attention to the section on system wiring, as improper
wiring detracts from the performance of the system or causes system failure.
If you encounter a situation or have a question that this manual does not
address, contact your dealer or call Clear-Com directly at the factory. Our
applications support and service people are standing by to assist you. (Refer to
Chapter 6: “Warranty” for contact information.) Thank you for selecting
Clear-Com for your communications needs.
DESCRIPTION
The Clear-Com PS-702 is a single-rack-space, one- or two-channel intercom
power supply which can provide 1.2 ampere (2 amperes peak during call
signals and other temporary events) per channel to operate Clear-Com
beltpacks and remote stations. This power is supplied to either or both
channels, and will support up to 40 beltpacks or 10 speaker stations.
Clear-Com’s advanced fail-safe design can sense the difference between a
short or an overload to optimally protect itself. Power is restored in as little as
0.5 seconds, depending upon whether there was a single or multiple short or
overload. The other channel continues to operate normally. The PS-702’s
advanced fail-safe circuit will bring the power back up even under full load
conditions. LED indicators signal a fault on either channel. A line-level
program input offers a master input level. Individual program selects, each
with its own send level, are provided for each channel. Use of a switching
power supply allows the PS-702 to operate with any AC line voltage from 100
to 240 volts AC at 50 or 60 Hz. The sturdy metal chassis and extra-thick front
panel with integral rack ears maintains legendary Clear-Com ruggedness.
FAIL SAFE POWER
An intercom power supply has special needs that are not met by traditionally
designed power supplies. An intercom power supply must work in adverse
PS-702 TWO-CHANNEL POWER SUPPLY
1-1
conditions such as low AC line voltage, momentary shorts on the DC power
1
2
3
4
5
67
8
9
10
11
121314 15
16
17
18
19
20
5
10
15
20
0
0
0.5
2
4
7
14
20
Number of
seconds to
restore
Number of recent shorts or overloads
lines to the stations, and excessive peak loads during “power-on”conditions.
The following features are incorporated into the PS-702’s power supply:
• AUTOMATIC SHORT CIRCUIT PROTECTION: The PS-702’s
internal power supply checks each channel for a short or current overload.
If it detects a short the power supply will shut down that channel. A short
duration short circuit will not cause the power supply to interrupt power.
• AUTOMATIC OVERLOAD PROTECTION: The PS-702’s internal
power supply senses the difference between shorts and overloads. If an
overload is detected the power supply will shut down that channel. An
overload lasting a short period will not cause the power supply to
interrupt power.
• AUTOMATIC POWER RESTORE: The PS-702’s internal power
supply senses the difference between short-term and long-term shorts and
overload conditions. After the first few times a short or overload occurs,
the power supply will try to restore power after only 0.5 seconds. If the
short or overload persists or occurs repeatedly, the power supply will take
progressively longer (to a maximum of 20 seconds) to try to restore
power. This protects the power supply from damage due to overheating.
Once the short is removed, the channel will recover, even under a full load
condition. The automatic power restore times are shown in the following
chart:
1-2
Figure 1-1: Automatic Power Restore Times
• INDIVIDUAL CHANNEL SHORT CIRCUIT PROTECTION: Each
individual channel is separately overload and short circuit protected and
may draw as much as 1.2 amperes, though the total to both channels is
limited to 2 amperes. A short on any one intercom line will not bring the
whole system down.
• FRONT PANEL INDICATIONS: There are two short/overload
indicators on the front panel (one for each channel) and a power indicator
PS-702 TWO-CHANNEL POWER SUPPLY
for the power supply. The short/overload indicators light steady when an
overload or short condition is detected. They blink if power to a channel
has been shut off as a result of an overload or short. There is also an
indicator to show when channels A and B are linked.
• PARALLELING MULTIPLE POWER SUPPLIES: Multiple power
supplies can be paralleled to increase system capacity. The PS-702’s
internal power supply will automatically detect the actions of other power
supplies during overloads and short circuits to restore power as quickly as
possible.
• MULTI-CHANNEL REMOTE STATIONS MAINTAIN THE
POWER LINE ISOLATION: The RM-702 and KB-702 as well as any
two-channel remote stations or beltpacks are designed to use the isolated
power provided by the PS-702. Refer to Chapter 2‚ “Installation.”
• LOW NOISE CIRCUITRY: The direct current outputs of the PS-702
contain very little hum and noise. The PS-702 does not contribute to
audible noise in the remote stations and beltpacks.
Note: Power supply lines connected together at remote stations will disable
the individual channel short circuit protection feature.
PS-702 TWO-CHANNEL POWER SUPPLY
1-3
FRONT AND REAR PANELS
7
4
3
2
6
4
325
1
CHANNEL A
TERM
A
PS-702
CHANNEL B
TERM
B
ON
OFF
ON
OFF
12
11
10
10
11
8
PROGRAM INPUT
LEVEL
ADJUST
9
A description of the connectors and controls follows (Figure 1-2 on page 1-4).
Figure 1-2: Front and Read Panels
FRONT PANEL
1. POWER SWITCH: Turns the AC power to the PS-702 on and off. The green power light will illuminate when the power is on.
2. SHORT/OVERLOAD INDICATORS: If a short circuit or overload
condition appears on either of the intercom channel outputs, the red
short/overload light for that channel will illuminate. If this condition
persists, the microprocessor will disconnect power to that channel and the
red short /overload light will blink. If a red short/overload light is
blinking, the fault on that channel must be located and removed. When
the fault is removed, the PS-702 will restore power to that channel and the
short/overload light will go out. If there are no shorts, but the
short/overload light blinks, an overload exists, possibly due to too many
intercom stations connected on that intercom line.
If the failure continues, unplug the intercom line connected to the affected
channel. Its red short/overload light should go out. This indicates a short
in that line. Follow that intercom line, connecting and disconnecting
cables along the line until the fault is isolated.
3. PROGRAM SEND ON/OFF: These toggle switches, one for each
channel, connect program audio to each channel. Both channels receive
the same signal from the rear panel program input. The number of active
sends will not affect the overall send level to any channel.
4. PROGRAM SEND LEVEL: These controls (one for each channel)
adjust the level of program heard in that channel. The program switch
must be on for the control to function on that channel. (The level controls
work in conjunction with the program trim (8) level control on the rear
panel.) For a higher program level, turn the control clockwise. For less
program level, turn the control counter-clockwise. If the control is all the
way up on a channel and the program level in the line is not loud enough,
increase the input level with the program trim control on the rear panel.
Conversely, if there is still program heard on a channel when its level is
1-4
PS-702 TWO-CHANNEL POWER SUPPLY
all the way down, decrease the program trim level. Any change in the
program trim level control on the rear panel to adjust for one channel will
necessitate adjustments on the other channel to compensate.
Note: Do not force the controls past their stop points as this will
damage them.
5. TEST TONE: This toggle switch turns on a test tone which can be heard
on either or both channels when the program send switch for that channel
is in the off position. It can be handy for identifying which intercom
channel is which or for other test purposes. The program send level
controls adjust the level of the test tone on each channel.
6. A+B LINK SWITCH and INDICATOR: This toggle switch links the audio for channels A and B together. A yellow light indicates when the channels are linked. It can be useful to have both channels linked for rehearsals, but separated for performances.
7. INTERCOM LINE CONNECTOR and SWITCH: A single intercom line connector is located on the front panel for convenience. It can be switched between channels A and B with the associated toggle switch.
REAR PANEL
8. PROGRAM INPUT: This three-pin female XLR jack accepts a balanced
or unbalanced line-level signal. This is typically a feed from a mixing
console, an air feed from a studio to remote site over a phone line, or an
audio cue track. Send levels to the individual channels are controlled with
a combination of the program trim level and the program send levels on
the channels. This feed can be fed to either or both intercom lines.
9. AUDIO ADJUST: This control adjusts the overall input level of the
external program coming into the PS-702. It is used with the program
send level controls to achieve desired system program levels. Turn the
control clockwise to increase the gain and counter-clockwise to reduce it.
Note: Do not force this control past its stop points as this will damage
it.
10. TERM. ON/OFF: These switches (one per channel) select whether the
PS-702 will provide the required termination for each channel. These
should always be on unless there are other power supplies or terminated
main stations in the system. If there are other possible terminations in the
system, all but one must be turned off.
11. INTERCOM LINE CONNECTORS: There are three 3-pin male XLR
jacks per channel, wired in parallel, or looped through. All the stations in
the system are ultimately connected to the PS-702 through these jacks.
Because intercom audio is bidirectional, they are neither inputs nor
outputs, but may be thought of as “ports.” Pin #1 is connected to the
shield and carries the signal ground. Pin #2 carries the DC voltage that
runs the remote stations. Pin #3 carries two way audio and call signals.
12. AC POWER SUPPLY INPUT: Connects to AC with an IEC cable. The
PS-702 will accept any line voltage between 100 and 240 volts AC at
50 to 60 Hz. It will automatically adjust to the line voltage. There is no
need for a selector switch or an external fuse.
PS-702 TWO-CHANNEL POWER SUPPLY
1-5
1-6
PS-702 TWO-CHANNEL POWER SUPPLY
INSTALLATION
QUICK START
1. Unpack the unit and inspect for any damage that may have occurred during shipping.
2. Connect the proper AC mains cable to the outlet on the rear panel.
3. Install the PS-702.
4. Connect the intercom lines and program input as required. Connect the AC cord to the mains circuit.
5. Set the two termination switches on the rear panel to on.
6. Switch the power on. The green power light should be on and the two red short/overload lights should be off.
7. Switch the test tone and A+B link switches off. The yellow A+B link light should be off.
8. Select program sends and set program levels as required using program trim and program send level controls.
9. Set levels and sidetone nulls at remote stations.
10. The intercom system should now be operating properly.
11. Read the rest of this manual for further information.
INSTALLATION
INTERCOM LINE CONNECTION
The PS-702 provides three rear-panel 3-pin male XLR connectors for each
intercom line. These connectors are wired in parallel and intended for
loop-through connection. Any single-channel station or channel of a
multi-channel station connected on a line plugged into Channel A of the
PS-702 will be “party-lined” with all the other stations on that same channel.
In a multi-channel system, the goal is to assign specific people to the correct
group, (i.e., the other people with whom they need to be in contact the most).
This is particularly important when party-line users are on a single-channel
beltpack or station; less so if they are on multi-channel stations. The pinout of
the intercom connectors is as follows:
Pin 1 --- Ground (shield)
Pin 2 --- Power
Pin 3 --- Audio
PS-702 TWO-CHANNEL POWER SUPPLY
2-1
LINE TERMINATION (REAR PANEL)
Switching of the channels’ terminations on and off is done with the rear-panel
toggle switches. In most systems, all terminations on the PS-702 should be in
the on position (default setting). The fundamental concept of Clear-Com
party-line intercom is that all channels are terminated in one location,
preferably at the power supply.
Caution: All intercom lines must be terminated. Care must be taken not to
“double-terminate” a line. All unused intercom lines must also be
terminated.
The PS-702 provides terminations for each of its two channels. Clear-Com
main stations and power supplies provide switch-selectable termination
networks on all intercom lines. It is up to the user to ensure that the
terminations are set correctly. An unterminated line will cause excessive
levels, possible oscillation of line drivers, and severe imbalance of hybrid null
networks. A line with double or multiple terminations will cause low levels
and severe imbalance of hybrid null circuits.
If the PS-702 is the only power supply in the system (no other power supplies
or powered main stations are in the system) the termination switch on each
channel of the PS-702 should be switched to on. Simply toggle the rear-panel
switch labeled term to the on position. The termination switch should be set to
the off position only if the channel is terminated at another station.
PROGRAM INPUT (REAR PANEL)
An XLR connector provides the main program input to the station. This input
level is controlled by the rear-panel program trim control adjacent to the
program input connector. This control sets the overall level for all of the
channels. The input accepts a balanced or unbalanced line-level audio signal.
The program can be fed to either or both of the intercom lines by using the
front-panel toggle switches labeled program on/off. There is one of these
switches for each channel.
The pinout of the program input connector is as follows:
Pin 1--- Ground (shield)
Pin 2 --- - Signal
Pin 3--- +Signal
RACK MOUNTING
The unit requires 1.75 in. (4.45 cm or 1RU) of rack space. It requires no
additional free rack space above or below it for ventilation. The station is 5.25
in. (13.34 cm) in depth and requires at least 2.5 in. (6.35 cm) clearance in the
rear for connectors and cables. The single-piece front panel has integral “rack
ears.” This adds stability and strength.
2-2
PS-702 TWO-CHANNEL POWER SUPPLY
SYSTEM CHECKOUT
Before you turn on the power:
Check Termination
There should be one and only one termination for each channel in the system.
This termination is usually set to on at the main station or power supply. To
ascertain that only one termination is present on the channel, perform the
following test:
1. Using a multimeter, measure the resistance between pins #1 and #3 on one of the Channel A XLR connectors at the rear of the unit.
2. If the channel is terminated properly, then the resistance should measure
approximately 4 kOhm. A very high channel resistance means the
channel is not terminated. Channel resistance of 2 kOhm indicates a
double-termination. If a double-termination is indicated, locate the other
power supply or main station and set its termination to off.
Note: The location of the termination switch varies with model. On some
products, the termination switches are on the rear panel; on others
they are inside the unit. Consult the unit’s manual for the location.
3. Repeat for the other channels.
4. Check resistance between chassis ground and pin #1. Using an ohmmeter,
measure the resistance from pin #1 on the main station or power supply to
chassis ground. The measurement should read 10 Ohms. A high reading
(over 100 Ohms) indicates that the 10 Ohm resistor in the unit has failed
and requires replacement. Failure to perform the replacement will result
in an audible “buzz” in the system. A reading of less than 10 Ohms (or a
short) typically indicates that the shell and pin #1 of one of the
interconnect cables are shorted together. Test the individual cables until
the culprit is located and repair or replace the cable.
Note: Pin #1 and the shell of the XLR plug on the interconnect cables
should NOT be connected together.
Check Intercom Cable Resistance
For minimal crosstalk, the ground resistance of the intercom cables should be
as low as possible, preferably less than 2 Ohms. Disconnect an intercom line
from the main station or power supply. At the point in the intercom line
furthest from the unit, connect a clip lead jumper between pins #1 and #2.
Back at the “powered” end, use an ohmmeter to measure the resistance
between pins #1 and #2. A value of less than 4 Ohms is ideal.
PS-702 TWO-CHANNEL POWER SUPPLY
2-3
FINAL TESTS
After you turn the power on:
1. Check for proper voltage on pin #2 of any intercom line or jack in a channel. It should read 26 - 30 volts.
2. Test for proper operation of call signaling. Activate the call signal on any belt pack or station. The call lights on all other stations on that channel should illuminate and then go out when the call button is released.
3. Adjust the sidetone null on all stations. (Refer to the manual for each specific unit for instructions.)
2-4
PS-702 TWO-CHANNEL POWER SUPPLY
MAINTENANCE
INTRODUCTION
This chapter provides maintenance information including troubleshooting tips and a block diagram.
Caution:These servicing instructions are for use by qualified personnel only. To reduce the risk of electrical
shock, do not perform any servicing other than that contained in the operating instructions unless you are
qualified to do so.
TROUBLESHOOTING TIPS
SYMPTOM CAUSE SOLUTION
System does not operate. No
power to the PS-702. Green
power light is not illuminated
and no short/overload lights are
illuminated
Red short/
illuminated
Both red short/
are illuminated
overload
light
overload
lights
No AC power to the PS-702. Check AC connection and cable.
Plug into dependable AC source.
PS-702 has an internal power supply
failure.
Short or overload on that channel
due to a shorted or mis-wired cable.
Defective remote station. Check remote station and replace if
System is overloaded. Remove cables one at a time from
Unit requires servicing.
Remove cables one at a time from
system until the faulty line is located.
Check for shorts between pins #1
and #2. Once the short is removed,
the PS-702 will reset automatically
and the power will come back up
within several seconds, depending
upon how long the short has been
present.
necessary.
system to help determine where the
excess current requirements lie.
Re-evaluate system current needs.
Short in multipair cable. Remove cables one at a time from
PS-702 TWO-CHANNEL POWER SUPPLY
system until the faulty line is located.
Check for shorts between pins #1
and #2.
3-1
SYMPTOM CAUSE SOLUTION
Hum or buzz in system Inductive pickup caused by close
proximity of main or remote stations
to power lines or transformers.
Ω
chassis ground resistor is open. Check the DC resistance for 10Ω
10
If this condition occurs, it is because the system ground came into contact with something that was hot with
respect to the power supply earth ground. If this occurs, carefully check the system ground and AC
distribution in the area.
This is a potentially dangerous situation. A shock hazard may exist between the metal boom of a remote
station headset and ground.
System feedback (acoustical) Volume control at the remote station
is set too high.
Channel unterminated. Set the PS-702 termination switch
A headset extension cord was used. Headset extension cords are not
440 Hz tone is present on either
or both channels
Test tone feature is on. Set the test tone switch to the off
Relocate offending unit.
between the chassis and pin #1 of
any intercom connector.
Adjust.
for that channel to the on position.
recommended.
position.
Excessive crosstalk High DC resistance in ground return. Use heavier cable; add additional
conductor(s) to ground return.
Program signal sounds
distorted
Multi-channel cable pairs are not
individually shielded.
Headset cables are not wired
properly or shielded properly.
Overload of program in circuit. Reduce program in level or reduce
Table 3-1: Troubleshooting Tips
Replace cable with individually
shielded pairs.
Correct wiring. Use headsets with
properly shielded wiring.
the gain of the program signal at the
source, such as an audio mixer.
3-2
PS-702 TWO-CHANNEL POWER SUPPLY
PS-702 BLOCK DIAGRAM
PS-702
Voltage
Regulator
Power
Program
Trim
S witching
Power Supply
Module
Program
Input
Channel A
Power
Controller
Channel A
Voltage
Sensor
Channel A
Current
Sensor
Channel B
Power
Controller
Channel B
Voltage
Sensor
Channel B
Current
Sensor
Ch B
Term
Ch A
Term
Microprocessor
Overload
Channel
A
Overload
Channel
B
Filter
440 Hz
A + B
Link
Test Tone
On / Off
B
Send
Levels
A
Channel
B
Channel
A
Program
On / Off
A
B
IEC
Power
Inlet
On/Off
Test
Jack
Channel A – B
Select
The following is a block diagram of the PS-702:
Figure 3-3: PS-702 Block Diagram
PS-702 TWO-CHANNEL POWER SUPPLY
3-3
3-4
PS-702 TWO-CHANNEL POWER SUPPLY
TECHNICAL SPECIFICATIONS
PS-702 TWO-CHANNEL POWER SUPPLY
dBu is an absolute measurement. 0 dBu is referenced to 0.775 volts RMS
Program Line Input
Maximum Level before Clipping >= 20dBu
Input Impedance >= 5K
Frequency Response
Program Input - Party Line 200 - 20KHz ± 3dB
Max Distortion
Program Input - Party Line <= 0.2%
Noise
Program Mic Input - Party Line < -70dBu
Ω
Max Gain
Program Input - Party Line >= -16dB
Min Gain
Program Input - Party Line <= -20dB
Mains Power
Input Voltage Range 100 - 240 VAC
Input Frequency Range 50 - 60 Hz
Input Power <= 60 VAC
Output Voltage 30 VDC ± 0.5V
Output Current per Channel (Continuous) 1.2 A
Output Current per Channel (Peak) 2 A (Do not exceed the 1.2A rating
for more than 2 seconds per 1
minute period)
Short Circuit Recovery Time (1st short) <= 0.5 sec
Short Circuit Recovery Time >= 20 shorts in 20sec)<= 20 sec
Station Capacity
Up to 40 1-Channel Beltpacks, 10
speaker stations or 12 headset
stations distributed over both
channels
PS-702 TWO-CHANNEL POWER SUPPLY
4-1
Rear Panel Connectors
Intercom: (6) XLR-3M (3 per channel)
Program: (1) XLR-3F
AC Power: IEC 320 connector
Rear Panel Controls
(2) Termination On-Off
switches
(1) Volume control
Front Panel Connectors
Intercom (1) XLR-3M
Front Panel Controls & Indicators
(1) Intercom channel switch
(1) A+B link switch
(2) Program switch
(2) Send level controls
(1) Test tone switch
(2) Overload LEDs
(1) Link indicator LED
(1) Power indicator LED
(1) Power switch
Environmental
32 - 122o F (0 - 50o C)
Dimensions
19 in. W x 1.75 in. H x 7.5 in. D
x
(483 mm
44 mm x 190 mm)
Wei ght
6.16 lbs. (2.80 kg)
Notice About Specifications
While Clear-Com makes every attempt to maintain the accuracy of the
information contained in its product manuals, that information is subject to
change without notice. Performance specifications included in this manual
are design-center specifications and are included for customer guidance and
to facilitate system installation. Actual operating performance may vary.
4-2
PS-702 TWO-CHANNEL POWER SUPPLY
GLOSSARY
Some of the terms used when discussing critical communications for
television or theatre may be new to you as they are unique to intercom
applications. Although many of the terms are common to other audio
applications, to be certain you understand their meanings we offer the
following definitions:
All Call: Ability to push one button from the main station and talk to all
channels at once on a multiple channel system.
Ambient Noise: Those background sounds which are not part of the specific
communication but are picked up by the microphone. Selection of a good
“noise-cancelling” mic will reduce ambient noise.
Beltpack: A portable electronics package worn on the belt or mounted on a
wall or other convenient location. Interconnects to system with mic cable and
is powered by a central power supply or main station.
Bridging, High Impedance (hi-Z): A method of connecting to an audio line
(such as Clear-Com) without loading or taking appreciable power from that
line. Simply stated, as you add more and more stations to the line, the volume
remains constant.
Call Signaling: This feature is included with the majority of Clear-Com
products. It is a visual indicator on a station (lamp or LED) used to attract the
attention of an operator who has removed the headset.
Channel: A channel is the line that connects parties together within a party
line; it is a two-way talk path. For example, if you have six people who need
to hear one director, you have a seven-station single-channel need. If the same
director needs to speak privately to any one of the six, add a second channel.
You now have a seven-station, two-channel system.
Closed-Circuit: Any intercom which is connected via cable (also called
hard-wired).
Cross Talk: Leakage of audio transmissions from one channel to another.
Dry Pair: A telephone term used to describe a pair of wires (two conductors)
that carry audio but no DC voltage. Contrast this with a “wet pair” that carries
both audio and voltage.
Duplex: Duplex refers to bidirectional communications. Normal
communication between individual talking face-to-face is “full duplex” - in
other words you can talk and listen simultaneously. The other alternative is
“half-duplex” such as a push-to-talk situation where one station at a time can
talk while others listen. A walkie-talkie is a good example of half-duplex
communication.
IFB: The term means “Interrupted Fold Back.” A fold-back is a monitor
system that allows, for example, talent to hear their voices, or musicians to
PS-702 TWO-CHANNEL POWER SUPPLY
5-1
hear their voices and instruments on stage. IFB (program interrupt)
disconnects the program audio source while the talk button on the main
station is pushed.
ISO: A private conversation path. An ISO channel allows one to simply push
a button and transfer themselves and the person they wish to speak with to an
isolated channel.
Linking: Linking ties separate channels into one single party line.
Main Station: This is a product that includes both the ability to communicate
with multiple channels (without connecting them together) and to power all
the stations connected to these channels.
Master Station: A remote station which needs AC power to operate.
Multi-Channel: More than one channel.
Party Line (P.L.): Intercom system where all people talking on the system
can talk or listen to each other simultaneously. Also called conferencing.
Point to Point: One path to one person.
Program: Audio source that is fed into the intercom channels.
Program Interrupt: Disconnects the audio source while the talk button on
the main station is pushed (IFB).
Remote Mic Kill (RMK): The ability for certain main stations to shut off all
microphones on beltpacks in a system.
Remote Station: Like the beltpack, this would be any of the products
connected to the intercom line that allow duplex or half-duplex conversation,
but do not contain a power supply.
Sidetone: This is your own voice heard in your earphone as you are speaking.
Stage Announce (SA): Redirects output of the main station’s microphone to
an external destination (such as a PA system).
Station: A station is connected to one or more channels. For example, if you
have six people who need to hear one director, you have a seven-station
single-channel need. If the same director needs to speak privately to any one
of the six, add a second channel. You now have a seven-station, two-channel
system.
Ter min at io n: Passive network that is connected in each channel, usually on
the power supply or main station.
5-2
PS-702 TWO-CHANNEL POWER SUPPLY
Clear-Com offers 24 x 7
customer support if you
have an Extended
Warranty or Service
Contract.
Return Material
Authorization (RMA)
numbers are required for
all returns.
LIMITED WARRANTY
Clear-Com warrants that at the time of purchase, the equipment supplied
complies with any specification in the order confirmation when used under
normal conditions, and is free from defects in workmanship and materials
during the warranty period.
During the warranty period Clear-Com, or any service company authorized by
Clear-Com, will in a commercially reasonable time remedy defects in
materials, design, and workmanship free of charge by repairing, or should
Clear-Com in its discretion deem it necessary, replacing the product in
accordance with this limited warranty. In no event will Clear-Com be
responsible for incidental, consequential, or special loss or damage, however
caused.
WARRANTY PERIOD
The product may consist of several parts, each covered by a different warranty
period. The warranty periods are:
Both warranty and
non-warranty repairs are
available.
• Cables, accessories, components, and consumable items have a limited
warranty of 90 days.
• Headsets, handsets, microphones, and spare parts have a limited warranty
of one year.
• UHF wireless IFB products have a limited warranty of one year.
• UHF wireless intercom systems have a limited warranty of three years.
• All other Clear-Com and Drake brand systems and products, including
beltpacks, have a limited warranty of two years.
The warranty starts at the time of the product’s original purchase. The
warranty start date for contracts which include installation and
commissioning will commence from the earlier of date of the Site Acceptance
Test or three months from purchase.
TECHNICAL SUPPORT
To ensure complete and timely support to its customers, Clear-Com’s User
Support Center is staffed by qualified technical personnel. Telephone and
email technical support is offered worldwide by the User Support Center.
The User Support Center is available to Clear-Com’s customers during the
full course of their warranty period. Telephone support during the warranty
WARRANTY
i
period will be offered at no charge between 09:00 and 17:00 according to the
customer’s local time zone.
In addition, for customers who purchase an Extended Warranty or Service
Contract, 24-hour customer support is offered immediately upon purchase of
such agreement. For more information, contact your authorized dealer,
distributor, or sales representative.
Instructions for reaching Clear-Com’s User Support Centers are given below.
Americas and Asia-Pacific Headquarters California, United States Tel:
+1.510.337.6600 Email: CustomerServicesUS@clearcom.com
Europe, Middle East, and Africa Headquarters Cambridge, United
Kingdom Tel: +44 1223 815000 Email: SalesSupportEMEA@clearcom.com
Canada Office Quebec , Canada Tel: +1 (450) 653-9669
China Office Beijing Representative Office Beijing, P.R.China Tel: +8610
65811360 / 65815577
Once the standard warranty period has expired, the User Support Center will
continue to provide telephone support if you have purchased an Extended
Warranty or Service Contract. In these cases, you will have access to
telephone support 24 hours per day, 7 days per week.
WARRANTY REPAIRS AND RETURNS
Before returning equipment for repair, contact a User Support Center to obtain
a Return Material Authorization (RMA). Clear-Com representatives will give
you instructions and addresses for returning your equipment. You must ship
the equipment at your expense, and the support center will return the
equipment at Clear-Com’s expense.
For out-of-box failures, use the following contact information:
Americas and Asia-Pacific Headquarters California, United States Tel:
+1.510.337.6600 Email: CustomerServicesUS@clearcom.com
Europe, Middle East, and Africa Headquarters Cambridge, United
Kingdom Tel: +44 1223 815000 Email: SalesSupportEMEA@clearcom.com
Canada Office Quebec, Canada Tel: +1 (450) 653-9669
ii
China Office Beijing Representative Office Beijing, P.R.China Tel: +8610
65811360 / 65815577
WARRANTY
Clear-Com has the right to inspect the equipment and/or installation or
relevant packaging.
NON-WARRANTY REPAIRS AND RETURNS
For items not under warranty, you must obtain an RMA by contacting the
User Support Center. Clear-Com representatives will give you instructions
and addresses for returning your equipment.
You must pay all charges to have the equipment shipped to the support center
and returned to you, in addition to the costs of the repair.
EXTENDED WARRANTY
If you purchase an Extended Warranty, you are also given access free of
charge to the User Support Center 24 hours a day, 7 days a week.
You can purchase an extended warranty at any time during the first two years
of ownership of the product. The purchase of an extended warranty extends to
five years the warranty of any product offered with a standard two-year
warranty. The total warranty period will not extend beyond five years. Any
purchase of an extended warranty provides 24 x 7 customer support in
addition to the warranty immediately upon purchase of the warranty
extension.
Note: Clear-Com does not offer warranty extensions on UHF wireless
intercom systems, or on any product with a 1-year or 90-day warranty.
SERVICE CONTRACT
Clear-Com also offers service contracts that provide 24 x 7 telephone support,
advance replacements, training, proactive maintenance, on-site visits, and no
charge for repair or replacement of equipment. For more information, contact
your authorized dealer, distributor, or sales representative.
LIABILITY
THE FOREGOING WARRANTY IS CLEAR-COM'S SOLE AND
EXCLUSIVE WARRANTY. THE IMPLIED WARRANTY OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
AND ANY OTHER REQUIRED IMPLIED WARRANTY SHALL EXPIRE
AT THE END OF THE WARRANTY PERIOD. THERE ARE NO OTHER
WARRANTIES (INCLUDING WITHOUT LIMITATION WARRANTIES
FOR CONSUMABLES AND OTHER SUPPLIES) OF ANY NATURE
WHATSOEVER, WHETHER ARISING IN CONTRACT, TORT,
NEGLIGENCE OF ANY DEGREE, STRICT LIABILITY OR
OTHERWISE, WITH RESPECT TO THE PRODUCTS OR ANY PART
THEREOF DELIVERED HEREUNDER, OR FOR ANY DAMAGES
AND/OR LOSSES (INCLUDING LOSS OF USE, REVENUE, AND/OR
WARRANTY
iii
PROFITS). SOME STATES DO NOT ALLOW THE EXCLUSION OR
LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES OR
THE LIMITATION ON HOW LONG AN IMPLIED WARRANTY LASTS,
SO THE ABOVE LIMITATIONS MAY NOT APPLY TO YOU. IN ANY
EVENT, TO THE MAXIMUM EXTENT PERMITTED UNDER
APPLICABLE LAW, CLEAR-COM'S LIABILITY TO CUSTOMER
HEREUNDER SHALL NOT UNDER ANY CIRCUMSTANCES EXCEED
THE COST OF REPAIRING OR REPLACING ANY PART(S) FOUND TO
BE DEFECTIVE WITHIN THE WARRANTY PERIOD AS AFORESAID.
This warranty does not cover any damage to a product resulting from cause
other than part defect and malfunction. The Clear-Com warranty does not
cover any defect, malfunction, or failure caused beyond the control of
Clear-Com, including unreasonable or negligent operation, abuse, accident,
failure to follow instructions in the manual, defective or improperly
associated equipment, attempts at modification and repair not approved by
Clear-Com, and shipping damage. Products with their serial numbers
removed or defaced are not covered by this warranty.
This warranty does not include defects arising from installation (when not
performed by Clear-Com), lightning, power outages and fluctuations, air
conditioning failure, improper integration with non-approved components,
defects or failures of customer furnished components resulting in damage to
Clear-Com provided product.
This limited warranty is not transferable and cannot be enforced by anyone
other than the original consumer purchaser.
This warranty gives you specific legal rights and you may have other rights
which vary from country to country.
iv
WARRANTY
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