Bell 595 Series Instruction Manual

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Cc,pyright, 1954, by
Aw.erican Telephone and Tel egraph Company
Printed in U. S. A.
BELL SYSTEM PRACTICES
Station Installation and Maintenance SECTION C55.162
Issue 1, July, 1954
AT&T Co Provisional
TELEPHONE SET
595 TYPE
(DISTANT TALKING SET)
1.
GENERAL
1.01 Thi s sect ion cove1·s the description , use and ope ration,
installation and connection s, maintenance, and supplie s
information pertaining to the 595A-3 (manual) and 595B-3 (dial)
distant talking telephone set.
1.02 This set incorporates distant talking and loudspeaker
features and may be used on dial or manual individual
central office lines , PBX extension stations, and IA or !Al key
telephone sys tems. It is arrang ed for swit ching to either th e
distant talk fea ture and loudspeak er or to th e regular telephon e
set for normal use, as required .
1.03 Thi s telephon e equipment is install ed only upon issu-
an ce of a service order or other proper auth orization.
2. DESCRIPTION
2.01 Th e 595B-3 (distant talkin g) telephon e set, as shown in
Fig. 1, consists of three units: Th e 592B-3 teleph one set,
th e 758A-3 louds peak er, and th e KS -14964 contr ol un it.
592-Type Telephone Set
2.02 Th e 592B-3 telephone set shown in Fig. 2 contains th e
regular teleph one set features as well as the control and
switching arrangements for use wh en the distant talkin g featur e
is required. The teleph one set has the general appearan ce of a
500-type key telephon e set with an assemb ly consisting of a
loudspeak er volume control, pilot lamp, contr ol keys, and micro-
phone mount ed in th e base .
C55.162
Page
1
TELEPHONESET
595 TYPE
(DISTANTTALKINGSET)

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5928-3
TELEPHONE SET
NCOMING
SERVICE
42A-TYPE
CONN. BLOCK
Fig. I-Complete
595B-3
Telephone Set
105- 125 V. AC
COMMERCIAL
POWER SUPPLY---~

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Fig. 2-592B-3 Telephone Set
TRANSMITTER
(MICROPHONE)
2.03 The loud speak er volum e cont ro l (VO L) enables th e
subs crib er to cont rol the incomi ng loudspeaker level
only. Th e tran smitting level is controll ed by the amplifier gain
control in the KS -14964 control unit and is preset at the factory.
2.04 The pilot lamp lights in the ON button whe n the button
is pressed to opera te the telepho ne set as a distant
talking facility . The OFF butt on is used to disco nne ct the tele-
phone set from the dist ant talkin g featur e and to rest ore it for
normal use.
2.05 The transmitter (micropho ne) consists of a mod ified
Ul rec eiver unit mount ed in a soft neop ren e cushion
asse mbl y.
2.06 For addit ional informati on pertaining to components of
this tel ep hone set that are com mon to all 500-type tel e-
phone sets , consult the sect ions in the 500-se ries grou p.
C55.162
Page 3
TELEPHONESET
595 TYPE
(DISTANTTALKING SET)

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Page •1
758A-3 Loudspeaker
2.07 The 758A-3 loudspeaker is provided to furnish loud-
speaker facilities for the distant talking set. This loud-
speaker, as shown in Fig. 1, consists of a small speaker ur:it
mounted on a metal chassis which is provided with screw
terminals inside for mounting cord connections. These are en-
closed in a rectangular thermoplastic housing and metal grill.
The 5-1/2-foot mounting cord is equipped with a wing-type
band for fastening to a 42A-type connecting block. The base
of the speaker is provided with an adhesive-type friction pad.
KS-14964 Control Unit
2.08 The KS-14964 control unit, as shown in Figs. 3 and 4,
consists of an assembly of electronic apparatus mounted
on a base approximately 9-5/8 inches by 7-1/8 inches. It is
Fig. 3-KS-14964 Control Unit

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equipped with a removable cover, which is approximately 4
inches in depth and fastens with two captive screws. This cover
has a crinkle finish and is beige grey in color. The base is
arranged for wall or desk mounting. Entrance holes for the
inside wiring cable and power cord are located at the bottom
of the unit, and a terminal strip with screw-type terminals is
provided inside for connecting the inside wiring cable conduc-
tors. A clamp is provided for fastening the cable to the unit.
2.09 Included in the KS-14964 control unit are the trans-
mitting and receiving amplifiers (KS-14990 amplifier),
power supply, and associated circuits. The power supply fur-
nishes the plate supply for the amplifiers of both receiving and
transmitting circuits, power for the pilot lamp in the telephone
set, and power to operate the U200 relay. This control unit is
equipped with a 6-foot cord for connecting it to a 60-cycle, 105-
to 125-volt commercial power supply. This unit will not operate
on direct current.
Fig. 4-KS-14964 Control Unit (Open View)
C55.162
Page 5
TELEPHONESET
595 TYPE
(OISTANTTALKINGSET)

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Pag e G
2.10 The KS-14990 amplifier employed in the KS-14964 con-
trol unit furnishes both the receive and transmit ampli-
fication for the distant talking set. Both amplifier circuits are
mounted on a single plug-in type, plastic card which fits into
an
elongated socket in the base of the control unit, see Figs. 4
and 5.
3. USE AND OPERATION
3.01 The 595-typ e (distant talking) telep hone set is designed
for use on individual line service or with sepa rately
mounted , 6000-se ries keys of IA or !Al key telephone equip-
ments.
TUBE
RETAINER
AMPLI FlER SOCKET
Fi&. 5-KS-14900 Amplifier
CK-512AX
VACUUM
TUBE

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3.02 When it is desired to initiate or to answer calls with the
592-type telephone set and not use the distant talking
features, follow the normal telephone procedures established for
handset-type telephones. When this set is so operated the pilot
lamp does not light.
3.03 To Initiate Call on the Distant Talking Set: Let handset
remain in cradle and press the ON button in the tele-
phone set. This button is nonlocking; however, the relay in the
control unit will lock in, the pilot lamp will light the ON button,
and dial tone should be heard from the loudspeaker. This oper-
ation is equivalent to normal switchhook action. When dial tone
is heard, proceed to dial the number without lifting the handset.
As the called party answers, adjust the volume control (VOL)
for satisfactory receiving volume.
3.04 Microphone or transmitting volume cannot be controlled
manually by the subscriber. However, best results can
be attained by limiting the distance between the microphone
and the mouth to approximately 2 feet. All other standards of
good telephone usage such as a well modulated voice and facing
the telephone microphone apply to the distant talking set. Noisy
locations and those with poor acoustics will also affect the
quality of transmission.
3.05 To hang up or have the equivalent of switchhook oper-
ation at the completion of a distant talking conversation,
the OFF button must be pressed which returns the telephone
set to a normal condition. The pilot lamp will go out when the
OFF button is pressed.
3.06 To Answer Call, Using the Distant Talking Features:
Press the ON button in the telephone set. Since warmup
time is negligible, the pilot lamp lights and the conversation
may commence immediately. Adjust the volume control for
satisfactory receiving volume, then follow the steps outlined in
3.04 and 3.05.
3.07 To Transfer Call From Distant Talking Set To Hand•
set: If during the course of a distant talking conver-
sation it is desired to transfer to normal handset use of the
592-type telephone set, it is simply necessary to lift the handset.
The relay in the control unit will automatically transfer the
system to normal telephone operation and the pilot lamp in the
ON button will go out. The volume control does not control the
level to the receiver in the handset but operates on the loud-
speaker only when the telephone set is being used as a distant
talking facility.
C55.162
Page 7
TELEPHONESET
595 TYPE
(DISTANTTALKINGSET)

TCI Library https://www.telephonecollectors.info/
Page 8
3.08 To Transfer From Handset To Distant Talking Set:
If during the course of a normal handset conversation
it is desired to transfer to distant talking operation, it is neces-
sary to press the nonlocking ON button before the handset is
replaced on the cradle and to keep the ON button depressed
until the handset is replaced. Then follow the steps outlined in
3.04 and 3.05. Failure to keep the ON button depressed during
the replacement of the handset to the cradle may result in dis-
connects and lost calls.
4. INSTALLATION AND CONNECTIONS
4.01 Before starting installation, check that the commercial
power is ac. If de is encountered, refer the matter
through regular organization channels to the Engineering De-
partment for advice before proceeding with the work.
4.02 To connect the components of the distant talking set
use two 44A connecting blocks mounted on a 168B-type
backboard with a lOlC-type cover. Connect the telephone set
cord, the control unit wiring cable, incoming service extension,
or common ringer to the connecting block terminals, as shown
in Fig. 6.
Telephone Set
4.03 The 592-type telephone set should be located and
mounted as described in Section CSJ.153, lA Key Tele-
phone System Installation. The DlSF cord is equipped with a
stay hook which fits 44A connecting blocks. Make cord connec-
tions on the connecting block terminals as shown in Fig. 6.
Connections for the 592-type telephone set are shown in Fig. 7.
4.04 The telephone set cord should not be exposed to mois-
ture. If necessary, fasten cord near the connecting
block with a cable clamp to keep it off the floor.
4.05 When indicated on the service order or on other proper
authorization, retractile-type cords for the G-type hand-
set may be substituted for the standard handset cord.

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TERMINAL
STRIP IN 592 A/ B-3
TEL. SET
19
12-
-
r - -· - - -
- ·1
II
I
RR
0:>-
I ON NETWORKI 20 ,,,
I
OF 592 A/ B-3 I 21-
I TEL.SET I
is-
L _ __ ___ _J 15
5-
2::::
6 :::::-
7-
16 '.:.
,1-
10 -::
,1_
I
I
I
I
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I
I
I
I
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I
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I
DISF CORD :
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y
BK
BL
I
WH I
BR·R
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BR·GN
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BR·Y
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BR-BK
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BR-BL
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BR·WH
R·GN
:
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I
R·BK I
R·BL
I
CONNECTING
BLOCK(2 -ll 4 4A)
~ ' -,
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-7
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:::::9
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:::::5
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INSIDE
WIRING
CABLE
BL
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GN
MATE
BR
MATE
SL
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BL·WH
MATE
BL-OR
MATE
BL·GN
MATE
1
1
TERMINAL STRIP
KS-14964
I
CONTROL UNIT
I
NOTE I
NOTE I
1 -2 NOTES I: DEA
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BALANCE L
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END
EADS
THE
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::::3
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NOTE I
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- 7
OONDUCTOR AND
ERM-
A$
G.4.
FORMONT
INAL STRIP
SHOWNIN Fl
2:STRAPTO
NGERBRIDGE RI
TO INDIVIDUAL
L INE.
I
R·W
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;;,- 9
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e - I I
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SPEAKER
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R ~ 3 BL·S L
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::::a
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-
I
I INSID E WIRE
-
I
R2FK·3
I
42A
I
R
CORD
I
CONN.
I
FROM IAI KEY SYSTEM T l Tl OR T TO LINE FOR INDIVIDUAL
I
BLOCK
I
PER SD -6 92 07- 011
~
RI OR R RINGER OR TO COMMON
l-- --
~
X WIRING 'B" PWR.GND.Of IAISYS. RINGER CIRCUIT OF IA
FROM IA KEY SYSTEM
~~
: OR IAI KEY TEL . SYSTEMS
Y WIRING PER SD - 69 2 07 -0 11
J+. 1
R
z
WIRING lrRoM c.O.O R PBX LINEt ~J
Fig. 6-The S9S-Type Telephone Set-Connections
°'
LO "
LO
~
() p..

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Page 10
l[RIIIWACSR[IRUIICIDTO
s1,Ptlfl REAIIIII
Note
I: Contact sequence
(a)
Removing Hanclset
(1) cb closes before de
(2) fg opens
(b)
Restoring Handset
(1) fg closes
(2) de opens before cb
TRANSMITf[R
(MICROPHONE>
Note 2:
Manual service
(a) Replace dial with 95A-3
appara tus blank
(b) Move green lead from "F"
to "RR" on th e network
Fig. 7-The 592-Type Telephone Set-Wiring Diagram

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Loudspeaker
4.06 The 758A-3 loudspeaker must be installed so that it is at
least 3 feet away from th e telephone set. This distance
is necessar y to minimize singin g or howling
in
the loudspeaker
wh en the volum e is turned up too high. Attach the cord from
the loudspeaker to a 42A-type connecting block located a suf-
ficient distance fr om the 44A connecting blocks to facilitate
separation of the telephone set and loudspeak er.
4.07 Noisy loca tions will greatly cut down th e effectivene ss
of the loud speaker and should be avoided. Aiso, caution
th e sub scrib er aga inst placin g obj ects in front of the speak er
and against att emptin g to move th e speak er too close to th e
telephone set whi ch contains th e microphone .
4.08 Have the subscriber mak e a talking test to find the
best location for the loud speaker. In ;:;10st cas es the sub-
scriber may be most comfortable with the speaker on one side
of his desk and th e telephone on th e other, as shown in Fig. 8.
Fig. 8---General Location for Distant Talking Set
Control Unit
4.09 Do not plug the power cord into the commercial power
supply outlet until all of the connections of the system
are completed.
C55.162
Page
11
TELEPHONESET
595 TYPE
(DISTANTTALKINGSET)

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Page 12
4.10
In
locating the KS-14964 control unit be guided by the
subscriber's wishes and the considerations outlined
below:
(a) Avoid locations where the cord to the control unit may
be stretched across an aisle or passageway, or near a
window or other places where the unit may be exposed to
the elements.
(b) Locate the control unit near the location of the 592-
type telephone set.
The maximum allowable cable dis-
tance between the two is 20 feet.
In many cases, where
the cable length is extended beyond the 20-foot maximum,
objectionable dial clicks may be heard in the loudspeaker.
(c) Locate so that workman will not be exposed to injury
when working on the unit and where the equipment
will not be exposed to damage.
(d) Locate the control unit near a commercial 60-cycle,
105- to 125-volt power supply . The power cord is 6 feet
long.
This set will not operate on de power.
(e) When the control unit is to be attached to desks or
wall surfaces, be guided by considerations covered in
Section C31.145, Subscriber and Telephone Sets, for Indoor
Locations , Installation.
4.11 \"!hen a backboard is required the 147A, 165A, or other
suitable backboard may be used and attached in the
same manner as subscriber set backboards . When attaching the
control unit to the 165A backboard, center the unit on the back-
board.
4.12 Make connections on the terminal strips in the control
unit as covered in Fig. 6. Leave sufficient slack to enable
movement of cable conductors to different terminals. Fig. 4
shows a method of disposing of balance leads, spare conductors,
and the forming of cable conductors on the terminal strips.
4.13 Check that the KS-14990 amplifier is snug in place. Do
not attempt to adjust the gain control on the ampli-
fiers. These are set in the factory and should be readjusted
only by properly qualified and equipped maintenance or trans-
mission engineering forces.

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4.14 Upon completion of the itJstallation work on all of the
units of the distant talking set, plug the cord into the
60-cycle, 105- to 125-volt power outlet and make operation tests.
Test for proper operation of the ON and OFF switches, pilot
lamp, and volume control.
4.15 Make sure that the subscriber or a competent repre-
sentative understands the functions and use of the
system before leaving the subscriber's premises.
S. MAINTENANCE
5.01 When the telephone set, loudspeaker, or control unit
are dirty, clean the external surfaces and remove loose
dust from the interior in accordance with instruction included
in Section C30.012, Station Sets, Cleaning.
5.02 Make a visual inspection of the interior and exterior of
the telephone set, loudspeaker, and control unit for
obvious defects, such as loose, displaced. or broken parts, ob-
struction of moving parts, or the presence of foreign matter
that could interfere with the proper operation of the equipment.
Telephone Set
5.03 The window strip assembly is mounted to the housing
by means of snaps and may be removed by lifting it out
at each end with the point of a screwdriver or other similar
tool inserted under the end of the strip. The spring prong
fasteners of the snap remain captive in holes in the strip.
5.04 If trouble is encountered in the transmitter (micro-
phone). the complete assembly should be replaced. This
would include the neoprene gasket that cushions the unit.
S.05 In order to insure maximum illumination of the pilot
lamp, any accumulation of dirt or film on the end of
the lamp should be removed by wiping with a damp cloth.
S.06 The SIA lamp may be lifted out from between the
spring contact members of the SSA lamp holder by
inserting a small object into one end and forcing the lamp into
the open. ,:\Then replacing the lamp. press the lamp into place
between the contact members with fingers and slip it forward
toward the ON button to insure maximum illumination.
C55.162
Page 13
TELEPHONESET
595 TYPE
(DISTANTTALKINGSET)

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Page 14
5.07 Key buttons and switchhook plungers shall move freely
without binding or squeaking throughout their entire
travel. If they bind, remove set cover and determine cause of
binding. Clean the following parts with a cloth moistened with
KS-7860 petroleum spirits: key buttons and key button holes,
plungers and plunger holes, and the switchboard operating
bracket arm shaft. Do not allow petroleum spirits to get on
contacts of contact springs. If binding continues after cleaning,
replace the key buttons or plungers.
5.08 If SWITCH ARMS squeak, lubricate the bearing sur-
faces on each end of the operating bracket arm shaft
with a No. 2, or softer, graphite pencil.
5.09 No field maintenance shall be performed on the switch
assembly except the replacement of the switch assembly
dust cover.
5.10 Feet, or friction pads if present, shall not be cut, worn,
or have foreign matter imbedded in them to an extent
which might scratch the surfaces on which the set is placed.
If necessary, the feet may be cleaned by brushing with a stiff
bristle brush.
5.11 Feet that cannot meet the requirements in 5.10 shall be
equipped with triangular friction pad KS-8035. If the
telephone set is already equipped with friction pads and they
do not meet requirements, replace with new pads. If a foot is
missing, replace the set.
5.12 For adjustments, requirements, and general maintenance
information pertaining to C4A ringers, see Section
C31.207, Ringers-C Type, Maintenance.
5.13 For information pertaining to procedures for the re-
placement and cleaning of parts of the GIA handset see
Section C32.275, Handsets, Maintenance.
Loudspeaker
5.14 Inspect and clean the 758A-3 loudspeaker in accordance
with 5.01 and 5.02. Replace any loudspeaker housings
found chipped or cracked.
5.15 The loudspeaker base is equipped with an adhesive-type
friction pad. If the adhesive is found to have lost its
effectiveness, and if the friction pad cannot meet the require-
ments in 5.10 or is missing, replace.

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Control Unit
5.16 The following work is all that is recommended for field
maintenance of the KS-14964 control unit. Make tests
and trouble analyses in the following steps:
(1) Check to see whether the control unit is connected by
cord to the power supply outlet. The distant talking set
derives its power from the subscriber's ac power supply and,
therefore, will not operate during power failures. However,
regular telephone service is not so affected and the tele-
phone set may be used in the normal manner.
(2) Press the ON button in the 592-type telephone set. If
the pilot lamp fails to light, test the power supply outlet
with a neon voltage tester or equivalent.
(3) Take appropriate steps to have the subscriber arrange
for power restoration in the event of a power off con-
dition.
(4) When commercial power is entering the control unit
and amplification seems to be deficient in either or both
receiver and transmitter circuits, the complete KS-14990
amplifier should be replaced with a serviceable one to give
a quick indication that the trouble is in the amplifier.
(5) Disconnect the power supply to the control unit each
time the amplifier or its tubes are pulled out of the
sockets. The amplifier is held in place by a retainer as shown
in Fig. 4, which must be removed to free the amplifier.
Extreme care must be exercised in removing the KS-14990
amplifier from its socket in the base of the control unit.
Since the amplifier is mounted on a plastic card, it should
not be bent in its socket because bending may injure the
terminal encl of the card or the socket. It is recommended
that the amplifier be grasped by fingers of both hands, and,
if necessary, rocked slightly from side to side while exert-
ing upward pull.
(6) If changing the amplifier clears the trouble, tubes from
the changed amplifier should be replaced, one by one,
with those of the serviceable amplifier to determine which
are bad, if any. Each CK512AX subminiature tube is held
in place by a retainer which must be lifted to clear the top
of the tubes and bent back slightly to facilitate the removal
of tubes, see Fig. 5.
C55.162
Page 15
TELEPHONESET
595 TYPE
(DISTANTTALKINGSET)

TCI Library https://www.telephonecollectors.info/
Page 16
(7) Another procedure could follow along the se lines:
If
amplification see ms to be low in one circuit only, eith er
the receivi ng or th e transmitting, tube s can be rep laced in
the susp ected cir cui t to dete rmine whi ch is bad.
(8) In re inse rtin g the CK5 12AX submin iat ur e tub es, orient
them so that the reel mark on the tube base faces the
top of the card and the dot nea r the top end of the soc ket.
5.17
If
any of th e abov e steps do not clear troub le th at
ori ginates in the co nt ro l un it, repl ace it with a service-
able one.
6. SUPPLIES
6.01
Thi s sec tion contains replacement parts that are pecu-
liar to the 595-type (distant talking) telephone set.
Index Ordering Information and Description
Amp lifier
Amplifier, KS-14990.
Plastic card with print ed circuit and tubes
to amplify receiving and tran smi tt ing cir-
cuits .
Appara tus Blank
Blank, Apparatus, 95A-3 .
Covers dial opening when teleph one set
is used for manua l service.
Collar
P-19B533, Collar.
Sleeve for
ON
or
OFF
button .
Contro l Unit
Unit, Control, KS-14964.
Complete unit that furnishes pow er to the
distan t talkin g set.
Cord s
Cord, RZFK-3.
Loudspeaker mounting cord.
Cord, D18F-3.
Vinyl j2cke ted telephone mounting cord .
Dial
Dial, 7E-3.
Specia l dial for 592B-3 telephon e set.
Equalizer
Equalizer, 333A.
Tr ansmitter (micro phone) equalizer.

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Index
Friction Pads
Grid
Housings
Key Button
Knob
Lamp
Lamp Holder
Loudspeaker
Microphone and
Control Unit
Petroleum
Spirits
Plunger
C55.162
Page 17
Ordering Information and Description
P-14AZZ0, Friction Pad.
Adhesive-type friction pad for base of
loudspeaker.
Pad, Friction, KS-803S.
Adhesive-type friction pad for feet of the
telephone set.
P-14AZZZ, Grid.
Fits front of loudspeaker.
P-14AZI7, Housing Assembly.
Plastic housing for loudspeaker.
P-14AZ60, Housing Assembly.
Housing for 592-ty:pe telephone set includ-
ing plungers and handhold cover.
P-IZA8S6, Button.
Clear plastic ON or OFF button.
P-14A2S3, Knob.
Plastic knob for potentiometer.
Lamp, SIA.
Pilot lamp that lights the ON button.
Holder, Lamp, SSA.
Socket for SIA lamp.
Loudspeaker, 7S8A-3.
Complete loudspeaker with cord.
P-14A241, Microphone and Control Unit
Assembly.
Complete control assembly including
microphone, potentiometer, keys. lamp
holder, terminal strip, and mounting.
Spirits, Petroleum, KS-7860.
For cleaning metal parts (pt. or qt. cans).
P-14A246, Plunger.
Mounts the ON or OFF button.
TELEPHONESET
595 TYPE
(DISTANTTALKINGSET)

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Page 18
18 Pages
Index
Screws
Sets
Spring
Transmitter
(microphone)
Tubes
Washers
Window Strip
Ordering Information and Description
P-210799, Screw.
Flat head machine screw for the base of
loudspeaker.
P-210800, Screw.
Fit studs of the microphone.
Set, Telephone, 592A-3.
Manual telephone for the distant talking
set.
Set, Telephone, 592B-3.
Dial telephone for distant talking set.
Set, Telephone, 595A-3.
Complete manual distant talking set. In-
cludes 592A-3 telephone set. control unit,
and loudspeaker.
Set, Telephone, 595B-3.
Same as 595A-3 equipped with dial.
P-12A888, Coil Spring.
l{eturns ON or OFF button.
Transmitter (Microphone) 655A.
Complete microphone with neoprene gas-
ket.
Tubes, Vacuum, CK512AX.
Subminiature tubes for KS-14990 amplifier
(2 required).
Tubes, Vacuum, 3V4.
Miniature tubes for KS-14990 amplifier
(2 required).
P-284184, Washer.
Small washer for stud of microphone.
P-181055, Washer.
Large washer for stud of microphone.
P-14A243, Window Strip Assembly.
Plastic strip fits over control buttons and
microphone.