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DIGITAL PIANO
P-105B/P-105WH/P-35B/
L-85WH/LP-5AWH
SERVICE MANUAL
P-105B
P-35B
■ CONTENTS (目次)
......................................................................3
...........................................................5
........................................7
.................................................9
................................................... 25
.............................................................31
..................................................43/49
(テストプログラム)
.......................55/56
(ユーザーデータのバックアップ)
....................57/59
(起動フローチャート)
.....61/63
PARTS LIST
CIRCUIT DIAGRAM
CL
001875
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. AM YBS ´12.07

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Summarization of Contents

IMPORTANT NOTICES
United Kingdom Mains Connection Notice
Specific instructions for connecting the mains plug and cord in the UK.
General Safety Warnings
Important warnings regarding static discharge, chemicals, and handling components.
PANEL LAYOUT
P-105B/P-105WH Panel Controls
Diagram illustrating the control panel layout for P-105B/P-105WH models.
P-35B Panel Controls
Diagram showing the control panel layout for the P-35B model.
CIRCUIT BOARD LAYOUT
P-105B/P-105WH Board Placement
Visual representation of circuit board placement within the P-105B/P-105WH chassis.
P-35B Board Placement
Visual representation of circuit board placement within the P-35B chassis.
DISASSEMBLY PROCEDURES
P-105B/P-105WH Lower Case & DM Board Removal
Steps for removing the lower case assembly and DM circuit board for P-105B/P-105WH.
P-105B/P-105WH JK, HP, Speaker, Tweeter Removal
Instructions for removing JK, HP circuit boards, speakers, and tweeters.
P-105B/P-105WH Keyboard & PN1 Board Removal
Instructions for removing the keyboard assembly and PN1 circuit board.
P-105B/P-105WH PN2 & Speaker Grille Removal
Instructions for removing the PN2 circuit board and speaker grille.
L-85WH/LP-5AWH Pedal Assembly Disassembly
Instructions for disassembling the pedal assembly for L-85WH/LP-5AWH.
P-35B Lower Case & DM Board Removal
Steps for removing the lower case assembly and DM circuit board for P-35B.
P-35B JK, Speaker, Keyboard Removal
Instructions for removing JK circuit board, speaker, and keyboard assembly.
P-35B PN Circuit Board Removal
Instructions for removing the PN circuit board from the P-35B.
KEYBOARD ASSEMBLY DISASSEMBLY
White/Black Key Assembly Removal
Procedure for removing white and black key assemblies from the keyboard.
Actuate Rubber Removal
Steps for removing the actuate rubber from the keyboard assembly.
Rubber Contact Removal
Steps for removing the rubber contact from the keyboard assembly.
GHL Circuit Board Removal
Instructions for removing GHL circuit boards from the keyboard.
Hammer Removal
Procedure for carefully removing hammer parts from the keyboard mechanism.
KEYBOARD ASSEMBLY ASSEMBLY
Hammer Installation
Steps for installing hammer parts, noting different types and weights.
GHL Circuit Board Assembly
Instructions for connecting and mounting GHL circuit boards.
Rubber Contact and Actuate Rubber Installation
Procedures for installing rubber contact and actuate rubber components.
Key Assembly and Component Installation
Final steps for installing key assemblies and securing them with screws.
LSI PIN DESCRIPTION
YDA175 Digital Power Amplifier Pinout
Detailed description of pins and functions for the YDA175 amplifier IC.
R8A02042BG SWX08 LSI Pinout
Pin description for the R8A02042BG SWX08 LSI.
SWL01U CPU LSI Pinout
Pin description for the SWL01U CPU LSI.
μPD789022GB-A15-8E CPU Pinout
Pin description for the μPD789022GB-A15-8E CPU.
WM8524GEDT/R DAC LSI Pinout
Pin description for the WM8524GEDT/R DAC LSI.
CIRCUIT BOARDS DIAGRAMS
P-105B/P-105WH Circuit Boards
List and page references for circuit boards specific to P-105B/P-105WH models.
P-35B Circuit Boards
List and page references for circuit boards specific to the P-35B model.
GHL Series Circuit Boards
Page references for GHL88H, GHL88L, and GHL88M circuit boards.
CIRCUIT BOARDS DIAGRAMS (continues)
DM Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the DM circuit board of P-105B/P-105WH.
JK Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the JK circuit board of P-105B/P-105WH.
PN1 Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the PN1 circuit board of P-105B/P-105WH.
PN2 Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the PN2 circuit board of P-105B/P-105WH.
HP Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the HP circuit board of P-105B/P-105WH.
FFC Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the FFC circuit board of P-105B/P-105WH.
PNRC Circuit Board Layout (P-105B/P-105WH)
Component layout diagram for the PNRC circuit board of P-105B/P-105WH.
DM Circuit Board Layout (P-35B)
Component layout diagram for the DM circuit board of P-35B.
JK Circuit Board Layout (P-35B)
Component layout diagram for the JK circuit board of P-35B.
FFCS Circuit Board Layout (P-35B)
Component layout diagram for the FFCS circuit board of P-35B.
PN Circuit Board Layout (P-35B)
Component layout diagram for the PN circuit board of P-35B.
PCS Circuit Board Layout (P-35B)
Component layout diagram for the PCS circuit board of P-35B.
UNS Circuit Board Layout (P-35B)
Component layout diagram for the UNS circuit board of P-35B.
GHL88L Circuit Board Layout
Component layout diagram for the GHL88L circuit board.
GHL88M Circuit Board Layout
Component layout diagram for the GHL88M circuit board.
GHL88H Circuit Board Layout
Component layout diagram for the GHL88H circuit board.
TEST PROGRAM
Preparation for Testing
List of required items and PC setup for running the test program.
Starting the Test Program
Procedure for initiating the test program by pressing keys and the power switch.
Test Procedure Steps
Instructions on how to execute each test item by pressing specific keys.
Test Result Interpretation
How to interpret test results based on the C4 (OK) or C2 (NG) sine wave sounds.
Test Items and Judgment Criteria
Detailed table outlining test items, keys, and expected outcomes for version checks.
Test Items and Judgment Criteria (cont.)
Continuation of test items including sound checks, speaker mute, and headphone mute.
Test Items and Judgment Criteria (cont.)
Further test items covering MIDI/USB, ROM, RAM checks, and fail-safe functionality.
Residual Noise Level Measurement
Procedure for measuring output voltage at headphone and auxiliary jacks for noise.
Switch Test Order Table
P-105B/P-105WH Switch Test Sequence
Table detailing the sequence for testing switches and their corresponding LEDs.
P-35B Switch Test Sequence
Table outlining the switch test order for the P-35B model.
USER DATA BACKUP
Data Backup Preparation
List of required PC software and hardware for backing up user data.
Backup Procedure Steps
Detailed steps for connecting the instrument and using Musicsoft Downloader for data backup.
SYSTEM BOOTING FLOWCHART
P-105B/P-105WH Booting Process
Flowchart illustrating the system boot sequence for P-105B/P-105WH.
P-35B Booting Process
Flowchart detailing the system boot sequence for the P-35B model.
DM CIRCUIT BOARD CHECK METHOD
Symptoms and Test Points
Guide to checking specific test points on the DM circuit board for identified symptoms.
Output Terminal Check
Table for checking output terminals (speaker, headphone, AUX OUT) for proper function.
Test Point Specifications and Defect Parts
Detailed test point values, measurement methods, and potential faulty parts.
PARTS LIST
Overall Assembly Parts
List of parts for the overall assembly of the digital piano.
Keyboard Assembly Parts
List of components related to the keyboard assembly, including keys and mechanisms.
Electrical Parts (P-105B/P-105WH)
List of electronic components, including circuit boards and discrete parts for P-105B/P-105WH.
Electrical Parts (P-35B)
List of electronic components for the P-35B model.
Optional Accessories
List of optional accessories such as keyboard stands and pedal units.
KEYBOARD ASSEMBLY (GHL 鍵盤 Ass'y)
P-105B/P-105WH Keyboard Assembly Details
Exploded view and part numbers for the P-105B/P-105WH keyboard assembly.
P-35B Keyboard Assembly Details
Exploded view and part numbers for the P-35B keyboard assembly.
Hammer and Key Parts (P-105B/P-105WH)
Detailed part list and diagrams for white, black, and hammer components.
PARTS LIST - ELECTRICAL PARTS (P-105B/P-105WH)
DM Circuit Board Components
List of components on the DM circuit board for P-105B/P-105WH.
FFC, HP, JK, PN1, PN2, PNRC Board Components
List of components for FFC, HP, JK, PN1, PN2, and PNRC circuit boards.
DM Circuit Board Resistor List
List of resistors used on the DM circuit board.
DM Circuit Board Resistor List (cont.)
Continuation of the resistor list for the DM circuit board.
FFC, HP, JK, PN1, PN2, PNRC Board Component List
List of components for FFC, HP, JK, PN1, PN2, PNRC boards.
FFC, HP, JK, PN1, PN2, PNRC Board Component List (cont.)
Continuation of component list for FFC, HP, JK, PN1, PN2, PNRC boards.
PARTS LIST - ELECTRICAL PARTS (P-35B)
FFCS, JK, PCS, PN, UNS Board Components
List of components for FFCS, JK, PCS, PN, UNS circuit boards.
FFCS, JK, PCS, PN, UNS Board Components (cont.)
Continuation of component list for FFCS, JK, PCS, PN, UNS circuit boards.
DM Circuit Board Components (P-35B)
List of components on the DM circuit board for P-35B.
DM Circuit Board Components (P-35B) (cont.)
Continuation of component list for the DM circuit board of P-35B.
GHL Series Circuit Board Components (P-35B)
Component list for GHL88H, GHL88L, GHL88M boards for P-35B.
OPTION ACCESSORIES
L-85WH Keyboard Stand Assembly
Exploded view and parts list for the L-85WH keyboard stand.
LP-5AWH Pedal Unit Assembly
Exploded view and parts list for the LP-5AWH pedal unit.
CIRCUIT DIAGRAMS
Block Diagrams
Overview block diagrams showing the main functional units of the piano.
Wiring Diagrams
Diagrams illustrating the interconnection of various circuit boards.
Circuit Diagrams
Detailed schematic diagrams of the electronic circuits.
CIRCUIT DIAGRAMS (continues)
P-105B/P-105WH Block Diagram
Block diagram showing the signal flow and component connections for P-105B/P-105WH.
P-35B Block Diagram
Block diagram illustrating the signal flow and component connections for P-35B.
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