SERVICE MANUALHAMAMATSU, JAPANSERVICE MANUALSPECIFICATIONS ....................................3PANEL LAYOUT ..............................6DIMENSIONS ...............................................7JACK AND PLUG LIST ..................8CIRCUIT BOARD LAYOUT ..............9DISASSEMBLY PROCEDURE ............... 10LSI PIN DESCRIPTION ................. 18CIRCUIT BOARDS .............................21INSPECTION ............................................32/61MEASUREMENT ......................................53/82UPDATING FIRMWARE ...60/89DEVICE BACKUP ..................90CONTENTSINITIALIZING THE PX AMPLIFIER..................................................92FUNCTION LIST 94MESSAGE LIST 96/97START-UP SEQUENCE ........... 99/100ENDING SEQUENCE .............101/102PARTS LISTBLOCK DIAGRAMLEVEL DIAGRAMWIRINGCIRCUIT DIAGRAMCopyright (c) Yamaha Corporation. All rights reserved. PDF ’16.10PA 012180POWER AMPLIFIERPX10PX8PX5PX3