GTE 120B Shop Manual

GTE COMMUNICATION SYSTEMS CORPORATION
ENGINEERING-PLANT SERIES
TYPE 120B SINGLE-SLOT COIN TELEPHONE SET
SHOP PROCEDURE
CONTENTS
Page
SECTION 997-260-810
ISSUE 3. MAY 1985
1. GENERA·L. . . • . . . . . . . . . . . . . . . . . . . .. 3
2.
REPLACEMENT PARTS. . . . . . . . • . . • . ..
3
3. PRELIMINARY DISASSEMBLY. . . . . . . . .. 3
4.
UPPER HOUSING DISASSEMBLY. . . . . . ..
3
Handset. . . . • • . . . . . . . • . . . • . . . . . . . ..
3
Handset Cap. . . . . . . . . . . . . . . . . . . . . . .. 3
Fingerwheel . • . • . . . . . . . . . . , • . . . . . . ..
3
Hookswitch Dial Assembly. . . . . . . . .. . . ..
4
Interface Cable Assembly . . . . . , . . . . . . . .. 4
Hookswitch Pile-Up Assembly. . • . . . . . . . .. 4
Hookswitch Lever and Cam Assembly. . . . . ..
4
Rotary Dial or :Touch Calling Unit. • • . . . . ..
4
Metal Pushbutton Touch Calling Unit. . • . . .• 4
Term inal Board Assembly. . . • . . . . . . .. . .. 4
Coin Release Lever Assembly '. . . . .. 4
Lock Assembly. . . . • . . . . . . . • . . • . • . . ..
5
Latch Assem bly - _ . . . .. . . . . . . .. 5
Handset Hook. . . . . . . . . . . . . .. . . . . . . ..
5
Faceplate. . . . . . . . . . . . • . . . • . . . . . . . ..
5
5. LOWER HOUSING DISASSEMBLY. . . . . . ..
5
Vault Door. . . . . . . . . . . . . . . . . . . . . . . .. 5
Lock Assem bly. . . . . . . . . . . . . . . . . . . . .. 5
Reject Chute . . . . . . . . . . . . . . . . . . . . . ..
5
Anti·Stuffing Device . . . . . . . . . . . • . . . . .• 5
Rejector Mounting Plate AsSembly. . . . . . . .. 5
Coin Relay·Hopper, Coin·Chute and
Trigger·Switch Assembly. . . . . . . . . . . . ..
5
Chassis Assem bly. . . . . . . . . . • . . . . • . . . .. 6
Ringer Assembly. . . . . . . • . . • . . . • • . . . ..
6
Transmission Card Assembly. . . . . . . . . . . ..
6
Choke Coil Assembly .....•.•.•.•..•.. ,
6
Chassis Card Assembly. • . . . . . . • • . • . • . .. 6
Line Terminal Strip and Connector Assembly..
6
6.
ASSEMBLY OF LOWER HOUSING. . . . . . ..
6
Line Terminal Strip and Connector AssemBly.. 6
Coin Relay·Hopper, Coin·Chute and
Trigger·Switch Assembly. . . . . . . . . . . . .. 6
Anti·Stuffing Device . . . . . . . . . . . . . . . . .. 7
Chassis Assembly.. , . . . . . . . . • . . . . . . . .. 7
Mounting the Chassis. . . . . . . . . . . . . . . . .. 7
Rejector Mounting Plate Assembly. . . . . . . .. 7
Reject Chute " 7
Vault Door - . .. 7
NOTE: This PDF was produced from a 2nd generation photo
copy. When an original becomes available the photos and
schematics will be replaced with better images.
7/4/2015 Steph Kerman
1of70
7.
ASSEMBLY OF UPPER HOUSING ...•.•..
Faceplate and Adapter Plate . . . • . . . . . . • . .
Handset Hook. . . • . . • . . . . . . . . . . . . . . . .
Latch Assembly . . . . . • . . . . . . • . . . • • . • . .
Lock Assembly. , . . . . . . . . . . . . . . . . . • . .
Coin Release Lever Assembly••. _ ..•••.•..
Terminal Board Assembly _ .
Metal Pushbutton Touch Calling Unit . . • . . . .
Rotary Dial or Touch Calling Unit . . . . . . • . .
Metal Hookswitch Lever and CAM Assembly ..
Hookswitch Pile-Up Assembly . . . . . • . • . • . .
Interface Cable Assembly . . . . . . • . . . • . . . .
Hookswitch Dial Housing Assembly .•.•....
Number Card ..•.......•..••.••••••.
Metal Fingerwheel • • . • . . . . . • . • . . . . . . . .
Handset . . . . • . • . . . . . . . . . • . • . . . . • • • .
8.
FINAL ASSEMBLY AND TESTING...••••.
9.
REJECTOR MECHANISM MAINTENANCE ..
TVpes of Rejectors.......•.•.•..•••.•.
Maintenance Options . . . . . _ .. _ . • . • . . . . .
Equipment•••••..••••...•..•.•••.••
Cleaning .
Test Procedure . . . . . • . . . . . . . . . . • • . . • •
Test Stand Mounting. _ ...•......•.••.•
Minimum Test, United States Coinage
Rejectors ..•... _ . . . . . . • . . • . . • . . . .
Minimum Test, Universal Coinage Rejectors ...
Maximum Test, United States Coinage
Rejectors _ .
Maximum Test, Universal Coinage Rejectors •..
Special Slug Problems••••...••.•.••••..
Special Rejector Unit Adjustment.••.••.•.•
Dial and Touch Calling Unit Adjustment •.•..
10. HOOKSWITCH ADJUSTMENT .....•••...
Hciokswitch Lever Assembly ...•.••.•.•. :
Hookswitch Springs . . • . . . . . . . . . . • • . . . .
11. TRIGGER ADJUSTMENT . . . . • . . . . . • . . •
Requirements .
Coin Test Requirements .
12. COIN HOPPER AND RELAY ADJUSTMENT.
Manual Operation _ .
Coin Trigger . . . . . . . . . . . . . . . . . . . . . • . .
Spring Pileup :
Copyright 2015 Steph Kerman
& Telephone Collectors International
All Rights Reserved
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