General Telephone & Electronics Automatic Electric P-A-X, Maintenance Manual

Page 1: ...1 11 f I 1 I I ri 1 I J 1 1 I _ v I 11 I 11 I 1 I I I 1 I r 1 I j l J t I r I I v 1 I x l I I y I I I l 1 _ I I I 1 J I 1 1l fl v l I I I I I 1 I 1 I c I 1 i t t i I I l 1 1 I I t r 1 9 I I j Ii I r...

Page 2: ...ss Commwiity Arttdmatic Exchangu Una tel jded automatic un its for s1 iaJI rural or suburban ueas 1 wi th fa c1Jities for SWit iingintO attended I I I Tel phone _ln trumflnls Modern desig ns fo1 autor...

Page 3: ...ss 3 Complaints Class 4 Complaints Investigation of Complaints and Correction 6 TROUBLE SHOOTING 6 1 General 6 2 General Notes 6 3 Using the Test Lamp 6 4 Using the Ground Cord 6 5 Testing Tone and Ri...

Page 4: ...RRUPTER Iii RINGING CONVERTER TONE EQUIPMENT TONE TRANSFORMER RINGING TRANSFORMER VOLTMETER CONNECTOR SWITCHES CRS Fig ure 1 Typical rotary type P A X FINDER CO NNECTOR LINKS FC LINK TEST BINDING POST...

Page 5: ...b The second component is the P A X equip ment which is designated as the B equipment c The third component is the building wiring which is designated as the C equipment 1 3 Station Equipment rr11e t...

Page 6: ...al line equipment This group of identical units required for each telephone line consists of line relays The two wires from each telephone terminate in the switchboard at a line relay When a subscribe...

Page 7: ...a ratchet mechanism for raising and rotating the shaft and two sets of wipers termed the line and control wipers Its electrical components include several control relays vertical and rotary stepping...

Page 8: ...d into an a c source for operating the telephone ringers via the connectors 4 d P f Ringing interrupterso An a c so11rce is interrupted and delivered to the connec tors for ringing the called telephon...

Page 9: ...adjusting H 21766 Offset Air gap adjustment Screwdriver H 24664 Screwdriver General usage H 7062 Open end Residual screw Wrench lockout H 7063 Open end For adjusting rotary Wrench switches TL 117 Sold...

Page 10: ...on It is advisable to inspect for the following condi tions a Overheating Look for discoloration blistering or bulging of the parts or surfaces of a cover leakage of insulating compound and oxidation...

Page 11: ...o maintain the proper electrolyte level within the cells See the manufacturer s literature for complete details of battery care f Relay contacts Clean dirty relay contacts with a fast drying fluid suc...

Page 12: ...ct speed of 10 pulses per second In other words the dial should restore in approximately one sec ond if the number O has been dialed A corrected dial may be used as a comparison 6 Clean and adjust the...

Page 13: ...TA 2 STA 6 TO STA 7 TO STA B STA 9 CA PR I CA PR I HOUSE CABLE STA 10 Figure 6 Sclie111atic diagram u a key lelejJ ume s1 s 1 n1 TELE NO __ 1_1 STA I MOF OR TERMINAL BOX 9 TCI Library www telephonecol...

Page 14: ...strument terminal block or test point 4 Connect a spare telephone and initiate and receive 10 calls from this point Since satisfac tory results eliminate the building wires as the source of trouble th...

Page 15: ...ould a lineswitch need attention check one of the following a b The station subscriber complains that he can receive but cannot initiate calls Proceed as follows 1 Test the station s lineswitch by pla...

Page 16: ...e operating circuit of the solenoid also check if the trip relay has operated b 4 Clean the contacts or adjust the springs as required sections 4 2 2f and 8 2 The station subscriber complains that the...

Page 17: ...the contacts and adjust the springs as required sections 4 2 2f and 8 2 c The station subscriber complains that at times he waits for dial tone Test line finders as in section 5 6 5a above Proceed as...

Page 18: ...an open operating circuit of the rotary magnets with the use of a test lamp or ground cord sections 6 3 and 6 4 4 Clean contacts or adjust springs as required sections 4 2 2f and 8 2 The station subsc...

Page 19: ...nectors in that particular group per section 5 6 7a above by dialing any station number in the group to locate the switch not supplying Int Gen to the bells of the called party 2 Note that when a stat...

Page 20: ...a busy level to find the connector not supplying busy tone 2 Check for an open busy tone circuit with the use of a receiver with a series capacitor section 6 5 3 Clean the contacts or adjust the sprin...

Page 21: ...e a station subscriber s com plaints test unit operation when checking Class 4 complaints involving no ringing or faulty ringing a No station can be signaled No ring back tone is heard 1 Start this un...

Page 22: ...am attached to the upper portion of the Strowger switch shaft on specified levels 18 j Cam springs are operated by their cam on the eleventh rotary step of the Strowger switch shaft unless otherwise s...

Page 23: ...ati1w an open d c circuit u ith a test lamp 200 n I I 3 X Ht Y 2 1 2 NOT NOT OPER OPER OPER G 8 4 8 z 3 7 C i 5 Figure 9 Locating a short in a d c circuit c WIPER WIPER 200 n LINE RELAY BCO COIL c WIP...

Page 24: ...e JU Verifying a break in a tl c cirrn1 2oon B I 3_Fl ti _c____ a _______ __ P l I 2_3 11 c WIPER Ml 4 f ___________________ NOT OPER OPER G G II I z 0 J 0 22 z NOT OPER 4 3 5 OPER Q 8 7 Figure 11 Loc...

Page 25: ...sting a capacitor the tone at X is loud but with the pick at Y the following conditions are possible 1 A reduction in volume indicating a good capacitor 2 The same volume indicating a shorted capacito...

Page 26: ...lettering kit or suitable brush to stamp or paint the letter s clearly A new coil a new armature or a new heelpiece complete with factory assembled spring pile up can be ordered as a spare part Indiv...

Page 27: ...ding pointer arm 9 to wiper assembly 14 and bank assemblies 13 remove pointer arm 9 and two bushings 10 d e f g h Remove three 5I16 hexagon head nuts 11 and two washers 12 holding bank assembly to fra...

Page 28: ...NAL HEAD NUT 22 ADJUSTING SCREW 23 MACHINE SCREW 24 LOCKWASHER 6 DOUBLE HOLED WASHER 15 HEXAGONAL HEAD STUD SCREW 25 OR IVING MAGNET COIL 7 DETENT STOP SPRING 16 WASHER 8 MACHINE SCREW 17 ARMATURE ASS...

Page 29: ...icating power fuse abbreviated fuse burns out its springs move apart One spring touches the alarm bar or stud closing the alarm circuit This actuates an audible or visual alarm device The other spring...

Page 30: ...IONARY SPRINGS ARMATURE BACKSTOP Fix11re 15 Residual scre1t adj1tslme11t Figure 16 Spring adjusf111ent H 20777 STATIONARY SPRINGS STATIONARY SPRlllGS Figure 17 Make before break sprinf adjustment SPG...

Page 31: ...must be bent carefully Use spring adjusters H 88504 or H 42873 substitute tools may damage the springs Consult technical bulletin 540 for the proper tools To change the position of a relay stationary...

Page 32: ...B 2e REPRESENT AN x SPRING COMB Figure 18 Adjustment of X contacts z I c tU z __ Cs r i _ ARMATURE BACK STOP Figure 19 Armature spring adjustment Figure 20 Clearance between armature spring and bushin...

Page 33: ...re with the thumb and bend the lever slightly to the left or right A relay armature lever may be adjusted under the following conditions a When the relay springs cannot be gauged with sufficient follo...

Page 34: ...uble dog latching spring does not latch or unlatch move the release armature pin slightly to correct it The busy key lever spring tension holds the lever Springs make and break with considerable follo...

Page 35: ...est lamp which is connected to battery this will operate the busy test relay Listen for busy tone To release the connector remove _the hand test tele phone from test jacks 1 and 2 and check the connec...

Page 36: ...meter and voltmeter for this purpose If stationary meters are not provided with the equipment portable meters may be used by connecting them to the proper termina ls on the blocks or shelves 2 Burnt...

Page 37: ...otary test 1 Plug the hand test telephone into test jacks 1 and 2 of the selector under test figure 26 The selector is seized Listen for dial tone 2 Connect theclipoftest cordH 74573 1 to battery Plac...

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