Bell System Practices 4A SPEAKERPHONE Identification, Installation, Operation And Maintenance Download Page 3

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CONN

CABLE

841050818

RETAINING

CLAMP

ISS

SECTION

512-700-100

108-TYPE

LOUDSPEAKER SET

Fig.

Typical Arrangement of 4A Speakerphone System With

or 4-Wire Telephone Set

Green (-5 1), White (-58), and Light Beige (-60).
The following kits may be ordered if a color change

is desired. Each kit contains all necessary color

significant parts to convert both the loudspeaker
and transmitter.

Kit of Parts

Color

D-180507

Black

D-180508

Ivory

D-180509

Moss Green

D-180510

Red

D-180511

Yellow

D-180512

White

D-180513

Lt. Beige

D-180514

Lt. Gray

D-180515

Aqua Blue

2.09

4A Speakerphone System Circuits.

(1)

The 4A speakerphone incorporates a

voice-switching circuit which eliminates

singing and essentially eliminates far-end talker
echo.

(2) When there is no transmission of speech,

loss is automatically inserted in the transmit

circuit and gain is added to the receive circuit.

Page

SSP S12-700-100-iOS_1979-04.{)3.jpg Scanned by frank Harrell, (Cowboy frank) Castle Rock, Colorado Feb 16,2012 23:01:09

Summary of Contents for 4A SPEAKERPHONE

Page 1: ...r private conversation Visual indication when system is in use Cutoff common ringer or other signaling devices when desired 2 03 Components of the 4A speakerphone system are shown in Fig 3 2 04 This system may be used with the lA lAl or 1A2 key telephone systems and all PBXs 2 05 For additional schematic and circuit information refer to SO and CD 69909 01 respectively A Ordering Guide 2 06 Compone...

Page 2: ...ot cord may be ordered for field replacement for the loudspeaker set or 223 type adapter Example Page 2 Cord D20N 87 14 feet 10 type loudspeaker set Cord D16H 50 14 feet 223C adapter Cord M16H 87 14 feet 223D adapter 2 08 The transmitter and loudspeaker set will be shipped in four promoted colors Black 03 BSP 512 700 100 i05_1979 04 02 jpg Scanned by Frank Harrell Cowboy Frank Castle Rock Colorado...

Page 3: ...rts Color D 180507 Black D 180508 Ivory D 180509 Moss Green D 180510 Red D 180511 Yellow D 180512 White D 180513 Lt Beige D 180514 Lt Gray D 180515 Aqua Blue 2 09 4A Speakerphone System Circuits 1 The 4A speakerphone incorporates a voice switching circuit which eliminates singing and essentially eliminates far end talker echo 2 When there is no transmission of speech loss is automatically inserted...

Page 4: ...d still switch satisfactorily because they generally increase their speaking levels under noisy conditions Page 4 B Radio Frequency Interference RFI and or Static Electricity Discharge Protection 2 10 In areas where RFI and or static electricity is a problem install a 680AD MD or 680AE transmitter and a 108AA loudspeaker set C 680A MD 680A14 MD 680AR MD 680AR14 MD 680AD MD 680AD14 MD 680AE or 680A...

Page 5: ...tween terminal 7 TVL and 5 GRD in the loudspeaker set to prevent damage to the loudspeaker set from discharge of static electricity E 82A MD or 82B Connecting Block 2 15 The 82 type connecting block is used to interconnect the 4A speakerphone system 680 type transmitter 108 type loudspeaker set and the 85Bl power unit for use with plug ended 6 button key telephone sets A reversible option plug pro...

Page 6: ...tandard operating features of the 4A speakerphone system are retained Attached to the chassis of the control unit is a connector same as that used in the 223 type adapter to which the 108 type loudspeaker set the 680 type transmitter and the 85B1 power unit are connected 2 20 The 80B control unit replaces the 80A control unit The 80B is the same as the 80A with one exception an additional connecti...

Page 7: ...type loudspeaker set when using 26 gauge wire or less than 125 feet from the 108 type loudspeaker set when using 24 gauge wire 3 04 A retaining clamp 841050818 Fig 1 and 2 should be mounted to the ac receptacle to hold the power unit securely and to prevent accidental loss of power Danger For safety securely attach retaining clamp to ac outlet using outlet cover screw BEFORE attempting to install ...

Page 8: ...signal cutoff using the R ING CUTOFF or AUX RELAY option as needed Use the leads to common signal control and common ringer or buzzer circuit for this cutoff feature Fig 10 8 For station busy lamp circuit with 4A speakerphone system refer to the appropriate Service section for telephone set involved 4 OPERATION Note The 4A speakerphone system permits normal use of the telephone set for originating...

Page 9: ...es in paragraph 3 04 ISS 5 SECTION 512 700 100 A Tests and Adjustments 5 01 When system is installed or maintenance is performed on any component make the following tests 1 Place a speakerphone call to the test desk Note Excessively loud TOUCH TONE signals will result at loudspeaker output during dialing if connections of IT and IR leads are reversed in the telephone set Speakerphone test call sho...

Page 10: ...Page 10 Note Do not remove the circuit board from the chassis 5 07 The plastic covers on the 680 type transmitter snap into place First remove the stationary cover by squeezing with fingers on the front and back surface and lifting gently Second pry up the rocker cover lifting along the edge adjacent to the thumb wheel The loudspeaker set and transmitter are designed so that color significant comp...

Page 11: ...Open wiring Tip or ring from line phone or handset Dial tone cannot be broken with Incorrect wiring Connection of tip and ring dial when on speakerphone from telephone line to telephone set TOUCH TONE dial inoperative Dial wiring For proper TI RI IT and lR when speakerphone is ON leads Excessively loud TOUCH TONE Incorrect Connections For proper IT and R signals at loudspeaker output connections d...

Page 12: ...0 44 R S 43 S R 42 O R 41 NOTES I ONLY LEADS INVOLVED IN SPEAKERPHONE ARE SHO IN 2 METAL STRAP FACTORY WIRED FOR IAI IA2 AI 2 MOVE TO TERMINAL 19 FOR lA KTS AI 19 ONLY WHEN PROVIDING BUSY LAMP OPTION t THESE FOUR TERMINALS APPEAR ONLY ON THE 828 CONNECTING BLOCK STRAP BETWEEN TERMINALS 6 AN D 12 ON IOBAA LOU DSPEAKER SET ONLYo 108 TYPE AG P3 IT P4 IR TI Rl AI 8 81 KSB 8 8 I KSC 8L K5M R RI K4B R R...

Page 13: ...INGER CUTOff 20 45 25 50 22 I 08 TYPE LSPK SET r 4 19 rt r 20 r 21 1 r 23 t 8 OPTION PLUG POSITIONEO fOR AUXILIARY RELAY OPERATION Fig 10 Wiring Involved in Options at 82 Type Connecting Block MOUNTING t OftD Page 13 BSP 512 700 100 i05_1979 Q4 13 jpg Scanned by Frank Harrell Cowboy Frank Castle Rock Colorado Feb 16 2012 23 01 19 ...

Page 14: ...V BR W 2 6 _ ________________ __ __ ______ 7 6 TVL G Il 27 4 GRO II G 28 t 2 N w o 29 _ ____________________________ 7 22 23 21 1 9 20 45 48 46 49 18 17 16 44 43 42 41 020N MTG CORD R G G R 11 BR W 0 R BL W S BA Wl BL RI 5 WI W BL G Il W G IBL W o w BR R R BR R 0 q s S R O R 108 TYPE LOUDSPEAKER SET AC 27 AC n 26 A I n 13 AG 9 f B BI KSB 18 8 81 K5C 19 8L K5M __n 17 f R RI K4e _ 20 R RI K4C 14 Tl ...

Page 15: ..._ _________ 46 L_ ______________ 49 680 TYPE MTG TRMTR 3 LK 5 VOL 8 6 2 7 6 2 9 V 6 TVL 4 GRO 2 ON CORD 0 W W BR BL W W BL BR W G W W G W 0 2f 4 18 3 17 4 16 26 44 27 43 28 42 29 41 ISS 5 SECTION 512 700 100 020N MTG CORD R G G R W BR W 0 R BL W S BR W BL R S W W BL G W W G BL W O W BR R R BR R 0 R S S R O R 108 TYPE LOUDSPEAKER SET AC r 27 AC A1 228 r 13 AG 91 B B1 K5B 18 B 81 K5C ffi BL K5M r 17...

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