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SILENT PIANO SERIES
b1-Silent, b2-Silent, JU109-Silent, JX113-Silent
MAINTENANCE HANDBOOK
YAMAHA
Introduction
This is the service manual for the b1-Silent, b2-Silent, JU109-
Silent, JX113-Silent Pianos developed in 2006. In this series, the key
and pedal sensor systems are designed into the piano, and the tone
generator and input/output jacks have been unified into a compact
design that is incorporated into the switch box unit.
When the piano is played with its mute engaged, the key and pedal
sensors detect piano performance and relay this data to the tone
generator via jacks on the back of the switch box. The mute mech-
anism is controlled by the center pedal, which operates the shank
stopper with three wires.
Regarding maintenance, damper pedal sensor position adjustment
is now carried out using measurements, not with VR adjustment.
Since this manual mostly covers new content, please make sure
that you refer to both new and previous manuals when performing
maintenance.
Contents
Introduction ......................................................................................1
Unit Layout .......................................................................................2
Caution: Removing the Lower Front Board......................................2
Caution: When Tuning .....................................................................3
Attaching/Removing the Action ........................................................3
Silent Piano Adjustment Standards..................................................3
Shank Stop Maintenance/Adjustment Procedure ............................4
Some Tips on Shank Stopper Unit Motion .......................................5
Test Mode ........................................................................................6
Maintenance Mode...........................................................................7
Unit Block Diagram ..........................................................................8
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Page 1: Table Of Contents
YAMAHA SILENT PIANO SERIES b1-Silent, b2-Silent, JU109-Silent, JX113-Silent MAINTENANCE HANDBOOK Introduction This is the service manual for the b1-Silent, b2-Silent, JU109- Silent, JX113-Silent Pianos developed in 2006. In this series, the key and pedal sensor systems are designed into the piano, and the tone generator and input/output jacks have been unified into a compact design that is incorporated into the switch box unit. -
Page 2: Unit Layout
Unit Layout Shank Stopper Key Sensor Unit Switch Box AC Adaptor Damper Pedal Sensor Soft Pedal Sensor Center Pedal Switch Box Front POWER REVERB VOLUME PHONES Rear DC IN 12V Caution:Removing the Lower Front Board The switch box obstructs removal of the lower front board. -
Page 3: Caution:when Tuning
Caution:When Tuning Since the shank stopper impedes use of the wood mute when tuning the treble strings, the TX600520 STICK MUTE UP PP is specially designed for this purpose and offers easy use. Attaching/Removing the Action Before removing the action, remove the shank stopper drive cables. -
Page 4: Shank Stop Maintenance/Adjustment Procedure
Shank Stop Maintenance/Adjustment Procedure 1 Checking the Shank Stop Position [Items to be checked] With the mute engaged (press the center pedal down and slide to the left to lock) and the hammers touching the shank stopper, check the distance between the strings and face of the hammer of keys in the low, medium, and upper registers. -
Page 5: Some Tips On Shank Stopper Unit Motion
4 Checking Pedal Stroke [Items to be checked] Make sure that the mute pedal ON/OFF stroke (shown on the right) is approximately 8mm. [Adjustment] Since pedal stroke is determined by the size of the mute pedal slot on the bottom sill, attach a slide skin to adjust. Some Tips on Shank Stopper Unit Motion Check the following items to smoothen operation of the shank stop unit. -
Page 6: Test Mode
Test Mode This series features a test program that verifies key sensor and pedal sensor point of detection of performance information. The test mode is useful for checking the point of detection and assessing the cause for problems described below. ⋅... -
Page 7: Maintenance Mode
Maintenance Mode (Measurement Mode) The Maintenance Mode is a program used to optimize key sensor and damper pedal sensor performance by measuring their sensing positions. The Maintenance Mode should be used in the following conditions. ⋅ When the Test Mode reveals wide discrepancies in sensing positions or improper sensing positions. -
Page 8: Unit Block Diagram
Damper Pedal Sensor Measurement In prior Silent series models, the damper pedal sensing point was adjusted with VR on the tone generator board, on this series however, it is adjusted using the half point position measurement. Damper Pedal Sensor Measurement Procedures...