Yamaha P-105B - User Manual

HAMAMATSU, JAPAN
P-105B/P-105WH/P-35B/
L-85WH/LP-5AWH
SERVICE MANUAL
DIGITAL PIANO
CL
001875
■ CONTENTS
（目次）
SPECIFICATIONS
（総合仕様）
......................................................................3
PANEL LAYOUT
（パネルレイアウト）
...........................................................5
CIRCUIT BOARD LAYOUT
（ユニットレイアウト）
........................................7
DISASSEMBLY PROCEDURES
（分解手順）
.................................................9
LSI PIN DESCRIPTION
（LSI 端子機能表）
................................................... 25
CIRCUIT BOARDS
（シート基板図）
.............................................................31
TEST PROGRAM
（テストプログラム）
..................................................43/49
USER DATA BACKUP
（ユーザーデータのバックアップ）
.......................55/56
SYSTEM BOOTING FLOWCHART
（起動フローチャート）
....................57/59
DM CIRCUIT BOARD CHECK METHOD
（DM シートチェック方法）
.....61/63
PARTS LIST
CIRCUIT DIAGRAM
Copyright (c) Yamaha Corporation. All rights reserved.
AM
YBS ´12.07
P-105B
P-35B

Yamaha P-105B Specifications

General

RMS rated power	14 W
Tweeter diameter	50 mm
Number of speakers	2
Maximum polyphony (notes)	128
Mid-range driver diameter	120 mm
Music memory capacity (songs)	50
Keys quantity	88 keys
Product color	Black
Power consumption (min)	11 W

Weight and Dimensions

Depth	295 mm
Width	1326 mm
Height	163 mm
Weight	11700 g

Summary

Digital Piano Specifications

Product Specifications Overview

Details on dimensions, weight, keyboard features, voice types, effects, styles, song playback, recording, functions, connectivity, and power.

Panel Layouts

P-105 B;P-105 WH Panel Layout

Explains controls and connectors on the P-105B/P-105WH panel.

P-35 B Panel Layout

Explains controls and connectors on the P-35B panel.

Circuit Board Layouts

P-105 B;P-105 WH Circuit Board Layout

Diagrams showing placement of circuit boards within the P-105B/P-105WH chassis.

P-35 B Circuit Board Layout

Diagrams showing placement of circuit boards within the P-35B chassis.

Disassembly Procedures

P-105 B;P-105 WH Lower Case & DM Board Disassembly

Steps for removing the lower case assembly and DM circuit board for P-105B/P-105WH.

P-105 B;P-105 WH Component Disassembly

Instructions for removing JK, HP, Speaker, and Tweeter components.

P-105 B;P-105 WH Keyboard & Board Removal

Steps to remove keyboard assembly, PN1, and PN2 circuit boards.

P-105 B;P-105 WH Pedal Assembly Disassembly

Instructions for disassembling the pedal unit and its components.

L-85 WH;LP-5 AWH Pedal Assembly Disassembly

Instructions for disassembling the pedal unit and its components for L-85WH/LP-5AWH.

P-35 B Lower Case & DM Board Disassembly

Steps for removing the lower case assembly and DM circuit board for P-35B.

P-35 B Component Disassembly

Instructions for removing JK, Speaker, and Keyboard assembly for P-35B.

P-35 B PN Circuit Board Removal

Steps to remove the PN circuit board for P-35B.

Keyboard Assembly Disassembly Details

Detailed steps for removing key assemblies, rubber parts, and hammers.

Hammer Removal Procedure

Specific steps for safely removing hammer mechanisms from the key frame.

Keyboard Assembly Reassembly Steps

Re-assembly steps for keyboard components, including hammers and circuit boards.

LSI Pin Descriptions

YDA175 Digital Power Amplifier Pins

Pin descriptions for the YDA175 digital power amplifier IC.

R8 A02042 BG SWX08 LSI Pins

Pin details for the R8A02042BG SWX08 LSI.

SWL01 U CPU LSI Pins

Pin details for the SWL01U CPU LSI.

μPD789022 GB-A15-8 E CPU Pins

Pin details for the μPD789022GB-A15-8E CPU LSI.

WM8524 GEDT;R DAC LSI Pins

Pin details for the WM8524GEDT/R DAC LSI.

Circuit Board Identification

P-105 B;P-105 WH Circuit Board Identification

Lists and diagrams for DM, FFC, HP, JK, PN1, PN2, PNRC boards.

P-35 B Circuit Board Identification

Lists and diagrams for DM, FFCS, JK, PCS, PN, UNS boards.

GHL Series Circuit Boards

Identification for GHL88H, GHL88L, GHL88M circuit boards.

Test Program

Test Program Preparation and Startup

Required items, PC setup, connections, and boot procedures for diagnostic tests.

Test Procedure Execution and Results

Steps to perform tests and interpret outcomes using audible feedback.

User Data Backup

Data Backup Preparation

Required software, PC setup, and USB cable connection for data backup.

Backup Procedure Steps

Detailed steps for backing up user song data using Musicsoft Downloader.

System Booting Flowcharts

P-105 B;P-105 WH Booting Process

Flowchart detailing the startup sequence, including test mode and safety checks.

P-35 B Booting Process

Flowchart detailing the startup sequence for the P-35B model.

DM Circuit Board Check Method

DM Board Symptoms and Voltage Checks

Initial checks for power/sound issues and test point voltage measurements.

DM Circuit Board Output Checks

Verification of output signals from the DM circuit board to various jacks.

Parts List

Overall Assembly Parts

List of parts for the main structural components of the piano.

Keyboard Assembly Parts

List of parts specific to the keyboard mechanism, including hammers.

Electrical Parts List

List of electronic components like circuit boards, capacitors, resistors, and connectors.

Optional Accessories Parts

List of parts for optional items like keyboard stands and pedal units.

Circuit Diagrams

Block Diagrams

High-level overview of the piano's internal architecture and signal flow.

Wiring Diagrams

Diagrams showing physical connections and cable routing between components.

Overall Circuit Diagrams

Detailed schematics for the DM board and inter-board connections.