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RAYMER
OPERATING INSTRUCTIONS
WARNING: TO PREVENT FIRE OR SHOCK HAZARD. DO NOT EXPOSE THIS RECEIVER TO RAIN OR MOISTURE.
DESCRIPTION
The Raymer Model 840-35A is an all solid state
monaural FM background music receiver with pro¬
visions for paging. The receiver consists of a tuner for
the 88-108 MHz FM band and a 35 Watt RMS audio
amplifier with a microphone preamplifier.
The receiver has a music output and a preamp output
jack for connection to an external amplifier as well as a
high level phono input jack arxl a microphone jack
which may be switched for either high or low im¬
pedance input. The speaker outputs of the receiver are
for 4 or 8 ohms; or 25 volt or 70 volt balanced lines.
The Model 840-35A also features an electronic music
mute (precedence) circuit in place of a relay to quickly
fade out the music while paging; after paging the music
is smoothly restored. The receiver also has a variable
tone control.
UNPACKING
The unit is to be removed carefully from the carton
and inspected for any possible damage in transit. If
there is any evidence of any damage which might have
occurred in shipment, immediately notify your supplier,
or the transportation company which delivered it.
Claims for damage sustained in transit must be made
upon the carrier. Save all packing material for in¬
spection by the claim agent who will furnish you with
the proper forms and will also give you the necessary
instructions for filing a claim.
In addition to the unit the carton should contain a
warranty registration card. To insure proper servicing
and to protect your rights under the warranty, be sure
to fill in the warranty registration card and mail to the
factory within 10 days.
INSTALLATION
The Raymer Model 840-35A has ample vents for
normal ventilation; however, it should be placed so as
to permit free air flow around the unit. DO NOT PLACE
ANY OBJECT ON TOP OF THE COVER OR IN ANY
WAY BLOCK THE AIR FLOW OF THE VENTS. DO
NOT STORE OR OPERATE THE RECEIVER in areas
where the ambient temperature exceeds 140“F.
The receiver may be mounted in a 5V4" vertical panel
space in a rack, using a Raymer RPK-2 rack mounting
kit.
This unit has an AC line cord with a 3 prong plug.
The line cord should be plugged into a 3 wire grounded
105 to 120 volt 60Hz AC outlet. This will also ground
the receiver.
The AC receptacle on the rear panel is a 3 wire
grounded outlet which can supply power to accessory
or auxiliary equipment. Any auxiliary equipment con¬
nected to this AC receptacle is controlled by the
POWER on-off switch so that turning off the power on
the unit turns off all equipment.
CONNECTIONS
All connections are made on the rear panel of the
unit.
INPUT CONNECTIONS
All patch cords and input leads other than Music
Mute must be shielded cables. The Music Mute leads
do not have to be shielded. When output leads are run
near an unshielded microphone input plug, or when run
together with the microphone precedence leads, a
supersonic oscillation may occur. When this does
occur, it will appear as a distortion in the amplifier
output, and oftentimes will cause the circuit breaker to
“trip."
The Microphone input jack is for an unbalanced line
only. If it is necessary to use a balanced input, an out¬
board matching transformer such as Raymer Model
LMT-150 must be used. If the signal source is a tele¬
phone line or a 500 ohm input, the connection can be
made to the amplifier by means of a Raymer Tele¬
phone Matching Adaptor TM-1 or TM-2. The switch
above the microphone input selects the proper input
impedance. The Hi-Z position will match either crystal
or high impedance dynamic microphones; the Lo-Z
position will match microphones in the 150 to 500 ohm
range.
CAUTION
To avoid possible supersonic oscillation which
might result in damage to the unit, it is mandatory
that a shielded (metal cover) microphone plug be
used.
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If it is desirable to fade out the music while paging, a
"dispatcher" type of microphone with an auxiliary
switch having a pair of normally open contacts should
be used. The microphone is to be connected as shown
in Figure 1.
FIGURE I.
typical connection fora single microphone.
FOR MORE THAN ONE MICROPHONE,CONNECT THE
SWITCH CIRCUITS IN PARALLEL.
The PHONO input jack enables the unit to amplify
program material from a source other than the self-
contained radio tuner. This input is high impedance
with a maximum sensitivity of one-half volt and will
accommodate the output of a ceramic phono cartridge
or the output from any preamplifier such as tape,
phono, etc. If the source into the PHONO input is from
leased telephone lines, a Raymer TM-2 telephone
adaptor is required to match the telephone lines to the
input.
PREAMP INPUT
If it is desirable to add a signaling annunciator or
alarm to the Music and Page system, a RAYMER
MODEL TGSP-3 Tone Generator may be connected to
the receiver. The output of the TGSP-3 should be con¬
nected to the PREAMP IN/OUT jack. By connecting ip
this fashion the tone or alarm is unaffected by any of
the front oanel controls.
ANTENNA INPUT
For normal FM reception, the short antenna lead
supplied with the unit is sufficient for most locations. In
the event that the tuner is located in a remote area, an
external Dipole antenna will increase the number of
distant stations that can be received. This external
antenna is to be connected across the terminals marked
FM ANT.
OUTPUT CONNECTIONS
The speaker(s) or line matching transformers are
connected to the screw terminal board located on the
rear panel. For short distances any ordinary insulated
wire, such as parallel lamp cord, may be used.
The 4 OHM or 8 OHM output is used when connec¬
ting directly to the speaker voice coils. When a speaker
with an impedance of 8 ohms is connected to the
amplifier, use the terminals on the amplifier marked
GND and 8 . For a 4 ohm speaker or two 8 ohm
speakers in parallel, use GND and 4 .
The 25 VOLT or 70 VOLT output is used when con¬
necting to speakers which have line matching trans¬
formers. Connecting to the 25 volt or 70 volt tap on the
unit permits the use of a number of speakers each
with its own corresponding line matching transformer,
thereby eliminating the necessity of calculating im¬
pedances. The tap on the line matching transformer is
selected to give the power desired for each speaker.
The total of all the power settings should be no greater
than the amplifier output rating. If the speaker uses a 25
or 70 volt line transformer, connect the speaker trans¬
former to the terminals marked COM and 25V (or 70V)
according to the line desired. For an unbalanced line
connect a jumper between COM and GND; if a bal¬
anced output line is used, no jumper is required.
Long lines have an appreciable resistance with re¬
sultant power loss. The use of parallel matching trans¬
formers on either 25 volt or 70 volt lines is recom¬
mended for long distances. In all cases, it is advisable to
run as heavy a wire as possible consistent with the
requirements. To avoid inducing hum in the system, dp
not parallel speaker cables with any AC line power
cables.
70 volt distribution systems often require the speaker
lines to be run in conduit. To determine whether they
should be run in conduit check with local city codes for
70 volt system requirements.
Optimum performance of any transistor amplifier de¬
pends on the proper current delivered at the output
terminals. Connecting a total load impedance at any tap
less than the impedance indicated on the back panel of
the amplifier will cause the transistors to deliver more
current than they were designed for and will deteriorate
the performance of the unit and cause damage to the
transistors. To prevent this from occurring and to
protect the components, the unit is equipped with a
circuit breaker that will trip if the output impedance is
below the specified rated value; for example, if two 8
ohm speakers are connected in parallel (resulting in a 4
ohm impedance), and in turn connected to the 8 ohm
output terminal, the circuit breaker will trip as soon as
the volume control is turned up to the unit's maximum
output.
The circuit breaker located on the rear panel protects
the unit from drawing excessive AC line current which
could cause damage to the internal components.
IN THE EVENT THAT THE CIRCUIT BREAKER
CONTINUES TO TRIP, DO NOT ATTEMPT TO DE¬
FEAT THE FUNCTION OF THE CIRCUIT BREAKER.
HAVE THE TROUBLE INVESTIGATED BY A QUALI¬
FIED SERVICE TECHNICIAN OR RETURN THE UNIT
TO THE FACTORY.
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MUSIC OUTPUT
The Music Output jack may be used to connect to an
external amplifier in order to operate a "MUSIC ONLY"
system (such as MUSIC-ON-HOLD) simultaneously
with the regular Music and Page function of the re¬
ceiver as shown in Figure 2. This output may be phono
or tuner as selected by the music switch on the front
panel and is not affect^ by the MUSIC MUTE.
It may also be used to feed the signal from either
phono or tuner to a tape recorder which has a Line in¬
put.
MUSIC OUTPUT OF RECEIVER USED TO DRIVE EXTERNAL
AMPLIFIER FOR SIMULTANEOUS MUSIC ONLY OPERATION.
PREAMP OUTPUT
The output from the PREAMP IN/OUT Jack may be
connected to the input of an additional external ampli¬
fier if desired. The output from this jack includes both
music and page so that both the receiver and the ex¬
ternal amplifier operate simultaneously.
OPERATION
The front panel has four knobs and three slide
switches. The functions of the knobs are as indicated.
The Microphone Volume Control knob adjusts the level
of sound for paging or public address, and is indepen¬
dent of the Music Volume control knob. The Music
Volume Control knob is used to adjust the level of the
sound of the FM portion or phono. The Tone Control
knob can be turned to the position that is most pleasing
to the listener as it affects both the high and low fre¬
quency response. The Tuning knob is to select the
desired FM station. The music switch is used to select
radio, or phono. The slide switch at the lower left is to
turn the unit on or off. The slide switch at the lower
right is used for AFC defeat.
AFC refers to Automatic Frequency Control and is an
electronic means of keeping the receiver properly tuned
to an FM broadcast station even when the tuning dial is
not precisely set. However when tuning to a weak
station which is adjacent to a stronger one the AFC
function may tend to lock the receiver on the stronger
station. In such a case the AFC switch should be placed
in the OFF position. For very precise tuning or selection
of a weak station the AFC switch should be placed in
the OFF position while tuning. When the station is
properly tuned the switch may then be returned to the
AFC position to lock the receiver to the desired fre¬
quency.
The LOG scale marking on the dial glass is for easy
recording of the position of the pointer for any spe¬
cific station.
WARRANTY
This unit has been very carefully inspected and is warranted to be free from defects in material and workman¬
ship under normal use and service for a period of one year from date of sale to the original purchaser. This Warranty
does not extend to any unit which has been subject to abuse, misuse, neglect, accident, improper installation, or
alterations. The obligation of Trutone Electronics under this Warranty is limited to the repair of any defect in ma¬
terial or workmanship and/or the replacemnt of any defective part, provided the unit is returned to Trutone Elec¬
tronics Inc. transportation paid within the year.
It is recommended that any unit on which service is required be processed through your distributor or installation
company wherever possible.
In order for the above Warranty to be in effect the Warranty Registration Card enclosed with the unit must be
filled out completely and mailed within ten days of purchase.
This Warranty is expressly in lieu of all other Warranties, expressed or implied, and of all other obligations or
liabilities on our part. We neither assume nor authorize any other person to assume for us any other liability in con¬
nection with the products manufactured by Trutone Electronics, Inc.
Made in U.S.A by
TRUTONE ELECTRONICS, INC. 7315 Fulton Avenue • North Hollywood. California 91605 • (213) 875-0423
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