GENERAL ...................................................................... 2 SYSTEM SET-UP .......................................................... 2 OPERATING FEATURES .............................................. 3 REALIGNMENT ............................................................. 7 DISASSEMBLY FOR REPAIR ..................................... 15 CIRCUIT DESCRIPTION ............................................. 16 SEMICONDUCTOR DATA .......................................... 20 DESCRIPTION OF COMPONENTS ............................ 22 PARTS LIST................................................................. 23 EXPLODED VIEW ....................................................... 30 PACKING ..................................................................... 31 CONTENTS Key top (DTMF) (K29-9043-02) ADJUSTMENT ............................................................. 32 PC BOARD VIEWS DISPLAY UNIT (X54-3250-10) ............................... 41 TX-RX UNIT (X57-587X-XX) .................................. 43 SCHEMATIC DIAGRAM .............................................. 49 BLOCK DIAGRAM ....................................................... 53 LEVEL DIAGRAM ........................................................ 55 KNB-14/KNB-15A (Ni-Cd BATTERY) .......................... 56 OPTIONS ..................................................................... 57 SPECIFICATIONS ................................... BACK COVER This manual is intended for use by experienced technicians familiar with similar types of commercial grade communications equipment. It contains all required service information for the equipment and is current as of the publication date. Changes which may occur after publication are covered by either Service Bulletins or Manual Revisions. These are issued as required.