SERVICE MANUALThis product uses Lead Free solder.This product complies with the RoHS directive for the European market.© 2010-11 PRINTED IN JAPANB51-8944-00 (N) 277TH-D72A/D72E144/440 (430) MHz FM DUAL BANDERWhip antenna(T90-1087-05)Knob (PTT)(K29-9457-03)Button knob(MONI/LAMP)(K29-9460-03)Button knob (Cross)(K29-9464-03)Packing (Chassis)(G53-1843-11)Knob (Volume)(K29-9458-03)Knob (Encoder)(K29-9459-13)Cap (SP/MIC)(B09-0736-03)Plastic cabinet assy(A02-4092-13)Front glass(B10-2797-12)CONTENTSDISASSEMBLY FOR REPAIR ......................2CIRCUIT DESCRIPTION ..............................4SEMICONDUCTOR DATA .........................12COMPONENTS DESCRIPTION.................16TERMINAL FUNCTION .............................18PARTS LIST ...............................................20EXPLODED VIEW ......................................35PACKING....................................................36TROUBLE SHOOTING ..............................37ADJUSTMENT ..........................................39PC BOARDTX-RX UNIT (X57-784X-XX) (A,B/3) ....56TX-RX UNIT (X57-784X-XX) (C/3)........60INTERCONNECTION DIAGRAM ..............64SCHEMATIC DIAGRAM ............................66BLOCK DIAGRAM .....................................82LEVEL DIAGRAM ......................................84OPTIONAL ACCESSORIESBT-15 (Battery Case) .............................86PB-45L (Li-ion Battery Pack).................86SPECIFICATIONS ......................................87