Bell System Practices 50A1 Identification, Installation, Connections, Operation, And Maintenance Download Page 8 | Manualshive

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SECTION

5 12-630- 1 11

Fig. 5-Remote Microphones Using Lavaliere and

Holder

Page 8
8 Pages

2 I 4 WIRE SELECTOR SWITCH

IIIII

Fig.

6-738

Control Unit, Rear Housing Removed

SSP

512-630-111-i01_1979-QS-08.jpg Scanned by

F

rank Harrell, (Cowboy Frank) Castle Rock, Colorado Feb 16, 2012 23:01:06

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Summary of Contents for 50A1

Page 1: ...RFI will be stamped on the underside of the base upon completion of modification 2 IDENTIFICATION 2 01 The 50A1 conference set Fig 1 consists of a 73B control unit a modified 220A 58 hand telephone set plus the other accessories listed in paragraph 2 03 under the Ordering Guide A Ordering Guide 2 02 The 50A1 conference set can be ordered as a complete unit as follows Set Conference 50Al 2 03 The f...

Page 2: ... NET c RR Ll L2 CONNECT TO POLARITY TERM GUARD BOARD s s T 1 Handset communication using a TRIMLINE hand telephone set Transferring between hands free and handset during conversation One way communication using the loudspeaker only A lead control for use with key telephone systems Means to provide audible TOUCH TONE signals for computer data input Means to connect both transmitted and received sig...

Page 3: ...Connections should be made using a shielded pair grounded at the customers equipment only If desired the conference set loudspeaker ISS 2 SECTION 512 630 11 1 can be deactivated by opening the shorting link between adjacent screw terminals on the base of the control unit Fig 3 Connection to and adjustment of the PA system is the customer s responsibility Typical signal levels are 45dbv at 600 ohm ...

Page 4: ...rol unit is deactivated whenever the handset is lifted 4 05 Incoming calls are heard through the set loudspeaker The output level is adjusted Page 4 by means of the VOLUME control Advance the VOLUME control only far enough for adequate listening level However when this control is set at 0 a lecturer speaking into the conference set will be heard more clearly at the remote location since the set wi...

Page 5: ...cord and the D4BU line cord before attempting any maintenance to the interior of the control unit 5 01 Set repair at customers premises should be limited to replacement of those parts listed in the Ordering Guide Repair of other components affects set performance and requires detailed testing 5 02 To remove the front and rear housing assemblies fromthe73B control unit disconnect the hand telephone...

Page 6: ... JOY P IJER SUPPLY CPI lOY ISV KI PI F LG r 1 orr PI TBI LINE SWITCH P2 6 3 RI 270 PRE AMPL P 0 CP2 P6 MIKES OFF r 6 fl 5 PS TRANSMISSION AND CONTROL CIRCUITS CP2 6 PA OUTPUT CUSTOMER EQUIPMENT K I SET MIKE ON P2 GOLD Ml KE 5 GREEN IKE AUX DIAL MIKES orr I Fig 4 SOA 1 Conference Set Block Diagram Sheet 1 of 2 Page 6 SSP 512 630 111 i02_1979 05 06 jpg Scanned by Frank Harrell Cowboy Frank Castle Ro...

Page 7: ...DIAL I T W R BL 5 R I I I I I I I I I I R13 L r 2 LINE I 3 2W SWITCH I II 110 411 HAND TELEPHON SET CORD JACK H40B COHO NC t L o Jiz BK T NC tKI 2W II R I G __ ___ 11 LINE SIIITCH R LG I II NOTES j k I REPLACE DIOP MOUNTING CORD fURNISHED WITH 25005 TELEPHONE SET liTH A S3A SWITCHBOARD CORD EQUIPPED liTH A 309 PLUG Oil EQUIVALENT ORDERED SEPARATELY SPECIfY LENGTH AND COLOR OF CORD SEE TABLE A FOR ...

Page 8: ...ophones Using Lavaliere and Holder Page 8 8 Pages 2 I 4 WIRE SELECTOR SWITCH IIIII Fig 6 738 Control Unit Rear Housing Removed SSP 512 630 111 i01_1979 QS 08 jpg Scanned by Frank Harrell Cowboy Frank Castle Rock Colorado Feb 16 2012 23 01 06 ...

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