North N-541 Handbook Download | Manualshive

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Summary of Contents for N-541

Page 1: ...SERI ES N 541 N 542 N 546 N 547 N 551 N 552 N 556 N 557 Telephone Sets NORTH TELEPHONE HANDBOOK NORTH ELECTRIC COMPANY 553 SOUTH MARKET STRUT GALION OHIO ...

Page 2: ...hio REGIONAL WAREHOUSES North Electric Company 387 Market Street Galion Ohio Telephone 2 4201 North Electric Company 754 756 Ponce de Leon Place N E Atlanta Georgia Telephones EL 6564 and EM 2618 NORTH TELEPHONE HANDBOOK Issue No II Copyright 1956 North Electric Company Galion Ohio U S A ...

Page 3: ...ral 18 19 4 II Connections 20 27 4 6 III Adjustment 28 30 6 9 IV Test 31 9 V Final Procedure 32 33 9 CHAPTER 3 MAINTENANCE Section I Inspection 34 10 II Trouble Shooting 35 39 10 18 CHAPTER 4 ADJUSTMENT Section I General 40 19 II Ringers 41 43 19 21 III Dial 44 50 21 23 CHAPTER 5 SUPPLEMENTARY DATA Section I Replaceable Parts List 25 26 II Table of Color Code Colored Telephones 26 III Table of Rin...

Page 4: ...nnections 7 Fig 5 Superimposed Ringing Wiring Diagram 8 Fig 6 Cradle switch Latch Wiring Diagram 8 Fig 7 Dial and Cover Rear View 13 Fig 8 Handset Exploded View 15 Fig 9 Ringer Marking 15 Fig 10 Straight Line Ringer 16 Fig 11 Frequency Selective Ringer 17 Fig 12 Cradle Switch 18 Fig 13 Bias Check Schematic Diagram 20 Fig 14 Gong Adjustment Schematic Diagram 20 Fig 15 Telephone Exploded View 24 ...

Page 5: ...Fig 1 N 541 Telephone Housing Removed ...

Page 6: ...MENCLATURE The optional features available with the North N 541 type telephones are identified as follows a N 541 Straight hand set cord b N 542 Cradle switch latch and straight hand set cord c N 546 Coiled handset cord d N 547 Cradle switch latch and coiled hand set cord e N 551 Superimposed ringing straight handset cord f N 552 Cradle switch latch superimposed ringing and straight handset cord E...

Page 7: ...ontains a network Part No 500 084 which includes the induction coil talking capacitor a 45 mf ringing capacitor equalizing varistors sidetone balance impedance and a radio interference suppression circuit across the dial contacts 11 RINGERS a There are two types of ringers Straight Line and Frequency Selective They are single coil types The impedance is 600 000 ohms at 1000 cps Coils have a d c re...

Page 8: ...ial has a modern extended number plate standard number card and is mounted on a snap in bracket 15 DIAL BLANK The dial blank for manual systems has the same contour as the type 7 dial and mounts on the snap in bracket 16 HOUSING The housing is of high impact plastic with threaded inserts for mounting on the base A hand hole is provided for lifting the instrument The plastic hand hole cover serves ...

Page 9: ...ns fluorescent lights and other apparatus known to create disturbances in telephones Power stations require special protective measures Areas containing explosive gases are particularly dangerous Avoid areas of excessive vibration In all cases the location should have ample accessibility for inspection and maintenance Section II CONNECTIONS 20 FACTORY CONNECTIONS The ringer dial and network are co...

Page 10: ...he connector block connect the YELLOW lead of desk cord to the same terminal as the GREEN lead d Superimposed Ringing When shipped phones are connected for L2 party For Ll party reverse line at connector block For LI or L2 party the network connections must he changed in accordance with Fig 5 Page 5 ...

Page 11: ...s for L2 and L2 parties For L1 and L1 0 parties use the same connections and reverse the line tip and ring at the connector block When shipped phones are connected for L2 party 25 CRADLE SWITCH LATCH The cradle switch latch holds the slate lead contact of the cradle switch open until the latch is released The wiring diagram Fig 6 shows the dial and cradle switch connections related to latch equipp...

Page 12: ... 3 20 45 A 25 27 P82 30 33 I 3 18 Cond 40 42 50 10 Equipped K 54 60 07 On 66 66 2 3 05 Ringer K SU See Fig 5 NOTE 2 For manual service replace dial with dial blank and transfer slate lead from F to RR NOTE 3 For bridged ringing connect yellow line cord lead to L1 at wall terminal block Fig 4 Wiring Diagram and Table of Ringer Connections listed on the service order a Ringer Tapping Tapping of the ...

Page 13: ... of network assembly Reversal of the line at the connector block may eliminate tapping If this fails increase the bias as outlined under Bias Spring b Bias Spring Two bias spring positions enable the ringer to meet widely varying line conditions As shipped from the factory the spring is in the low bias position shown on fig 10 To increase the bias remove the housing held to the base by two screws ...

Page 14: ...ialing transmission reception directory number and freedom from noise Section V FINAL PROCEDURE 32 NUMBER CARD Remove the number card protector and retainer ring from glassine envelope Mark directory number on card Place card and protector on retainer disc with the two cut out sections over the locating extrusions Place flange of ring over top edge of retainer disc and place both thumbs on face of...

Page 15: ... ring for legibility tightness or damage e Desk and Handset Cords Check cords for cracks splits or damaged conductors f Connections Place receiver to ear check for loose connections by tapping handset and housing Shake desk and handset cords I Ringer Check ringer operation by obtaining ringback h Transmission and Reception Check by calling wire chief repair service or other designated party Sectio...

Page 16: ...CAUT1ON NO ADJUSTMENT SHOULD BE MADE EXCEPT WHERE TROUBLE EX1STS 37 TROUBLE SHOOTING TABLE ...

Page 17: ...it in desk cord Replace network Par 39 n Replace telephone set See foot note 2 Replace desk cord Par 39 m Cannot break dial tone Loud clicks in receiver while dialing Called party cannot hear Pulse contacts do not open Dial filter capacitor short circuited Ringer capacitor short circuited bridged ringing Off normal dial contacts do not close Loose connection Open circuit in transmitter unit Replac...

Page 18: ... are available as part 564827 See Ringer Capacitor par 39 k 2 Cradle Switch may be replaced at the exchange See Par 39 o 3 Off normal and pulse contact springs may be replaced at the exchange See par 48 e Fig 7 Dial and Cover Rear View Page 13 ...

Page 19: ... free for proper functioning 39 REPLACEMENT OF COMPONENTS The following paragraphs briefly outline the procedure for replacement of the components or assemblies a Receiver Unit Remove cap remove unit from handle loosen screws and disconnect wires Replace in reverse order b Transmitter Unit Remove cap lift out transmitter unit Replace in reverse order c Transmitter Cup Remove transmitter unit lift ...

Page 20: ...se feet from slots in base plate Lift dial up and remove tongue from cradle switch bracket Turn dial face down and remove two mounting screws Remove dial from bracket Replace in reverse order i Dial Blank The dial blank is mounted on the bracket by two screws the same as the dial NOTE Mounting screws hold plastic dust cover on dial Replace screws to retain cover in place Fig 9 Ringer Marking Page ...

Page 21: ...line and 16 to 20 cps frequency selective ringers utilize the 45 mf capacitor in network If failure occurs transfer BROWN lead from A to K Remove bare wire from coil terminals and replace with capacitor 564827 45 mf For other ringers replacement capacitors are listed on page 26 1 Gong Remove housing Remove mounting screw from dome of gong and lift gong off resonating chamber Replace in reverse ord...

Page 22: ...late by two screws The pile up must never be removed from the bracket In event the pile up needs replacement the complete cradle switch must be replaced To replace a cradle switch lift out the dial and mounting bracket Remove SLATE RED WHITE GREEN WHITE ORANGE WHITE and BROWN WHITE leads from network terminals F L1 C and L2 Remove two screws holding cradle switch on plate Replace in reverse order ...

Page 23: ...rd mounting bracket Insert card through mounting bracket and into pile up binder until proper notch is past lever spring Release spring and set card in place Replace lever and actuator See note Fig 12 Cradle Switch Card Inset NOTE When lever does not pull against upper stop card may be cracked or chipped coil spring may be weak or lever bearing points may be gummy and sticking Replace spring or ca...

Page 24: ...onnect the ringer milliammeter and potentiometer to 48 volt battery as shown in the diagram Fig 13 The ringer should be mounted in the telephone for this test b Slowly increase current through ringer from zero to maximum and back to zero again to condition the iron in the magnetic circuit Slowly increase current until armature is pulled from the rest position and note current flow The current shou...

Page 25: ...operated position move left hand gong in until almost touching the clapper and tighten mounting screw Apply ringing voltage to check quality of ring Make any minor readjustment necessary 43 FREQUENCY SELECT1VE R1NGER B 245 a Adjustments other than setting the gongs should never be attempted on frequency selective ringers The resonating chambers have their mounting screw holes slightly off center R...

Page 26: ... edge With tool 500 470 or very small screw driver gently press end of spring inward until released from notch in governor shoe Move end of spring counter clockwise to increase dial speed or clockwise to reduce dial speed When spring has been moved to last notch and further adjustment is required remove the governor spring and stretch or compress spring as needed to obtain desired speed adjustment...

Page 27: ...st spring should have 1 1 2 turns on it and never more than 2 turns Replace finger wheel by reversing the procedure 48 PARTS REPLACEMENT Replacement of dial parts as outlined below requires adjustment be checked in accordance with preceding subparagraphs a Finger Wheel Remove number cam Remove three screws securing retainer disc and finger wheel Remove wheel Replace in reverse order b Number Plate...

Page 28: ...cts open 015 minimum Contact pressure per contact 15 grams minimum measured directly 20 grams maximum behind the contacts b The proper opening and closing time of contacts is determined by inserting feeler gauges between the top of actuator and upper stop The break contacts of the cradle switch are the contacts that open when the hand set is replaced on the cradle Switch in operated position There...

Page 29: ...Page 24 Fig 15 Exploded View Telephone ...

Page 30: ...TELEPHONE HANDBOOK CHAPTER 5 SUPPLEMENTARY DATA Section I REPLACABLE PARTS L1ST ...

Page 31: ...vory Koiled Kord B 223 8 565015 Richland Red Koiled Kord B 223 R 565016 Coral Sand Koiled Kord B 223 T 565017 Chartreuse Yellow Koiled Kord B 223 1 563247 Black B 101 563246 Emperor Blue B 101 B 1 563245 Tawny Green B 101 G 563244 Executive Gray B 101 GR 563243 Indian Ivory B 10 1 563242 Richland Red B 101 R 563241 Coral Sand B 101 T 563240 Chartreuse Yellow B 101 I 5632481 Black B 102 563249 Empe...

Page 32: ...and Red 568348 Coral Sand 568349 Chartreuse Yellow 565084 Black B 238 565085 565086 or Blue Emperor Dial 1 Tawny Green B 238 B 1 565087 Blank Executive Gray B 238 GR 565088 Ass y Indian Ivory B 238 J 565089 Richland Red B 238 R 565090 Coral Sand B 238 T 565091 Chartreuse Yellow B 238 Y 2 581559 Screws Dial Blank mtg 9183 2 562516 Lockwashers blank mtg screw 9054 15 1 3 1 2 568224 568223 568222 568...

Page 33: ...Executive Gray 564903 Indian Ivory B 205 GR B 205 J 564904 Richland Red B 205 R 564905 Coral Sand B 205 T 564906 Chartreuse Yellow B 205 Y 1 564816 Housing For sets with cradle B 234 switch latch Black REPLACEABLE PARTS FOR HOUSING 564800 Black B 201 564801 Emperor Blue B 201 B 1 564802 Housing Tawny Green B 201 G 564803 Executive Gray B 201 GR 564804 Indian Ivory B 201 J 564805 Richland Red B 201...

Page 34: ... PART NO FREQUENCY CAPACITOR CAPACITY C P S PART NO M F 565083 33 1 3 564829 18 565082 50 564830 10 565081 66 2 3 564832 05 565080 16 2 3 564827 45 565079 565078 25 20 584828 584827 27 45 565077 30 564829 18 565076 42 564830 10 565075 54 584831 07 565074 40 564830 10 565073 60 584831 07 565072 565071 585059 66 18 Straight Line 564832 564827 564827 05 45 45 565058 Superimposed 45 This Part for repl...

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