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Table of Contents
Related Manuals for Yamaha GB1KS
Summary of Contents for Yamaha GB1KS
- Page 1 MAINTENANCE HANDBOOK GB1KS MHB29 May, 2011...
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Page 2: Table Of Contents
Foreword This handbook covers maintenance for GB1KS, the Silent Grand Piano released in September 2009. For additional information, see GPS-GB1 Service manual PP008615 Table of Contents Unit structure and Names ---------------------------------------- 2 Adjustment / Checking points ------------------------------------ 4 Piano regulation caution -------------------------------------------5... -
Page 3: Unit Structure And Names
③ Sostenuto Pedal / Bass-damper Pedal -Europe: Sostenuto Pedal -US / CANADA: Bass-damper Pedal ④ Damper Pedal Fig.1 GB1KS switches Silent / Acoustic mode Switch Box with the operation lever and detects key -Front side and pedal movement. ⑤ Key Sensor Unit... - Page 4 ⑧ Silent Lever -Stroke adjustment of Silent lever ⇒P.6 -Bottom face diagram ⑨ Shift Pedal Sensor Shift sensor ON/OFF -How to check / adjust the sensor detection position ⇒P.14 ⑩ Damper Pedal Sensor Variable Resister (VR) Sensor ON / Half / OFF Switch Box -Damper pedal sensor measurement ⇒P.14...
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Page 5: Adjustment / Checking Points
2. Adjustment/ Confirmation Items Adjustment item Description Ref. page Piano regulation caution ・Disengage Silent mechanism ⇒P.5 ・Disconnect sensor cable Silent mechanism ・Check / adjustment ⇒P.6 ・Check / adjustment of hammer shank stopper ⇒P.6 ・Hammer shank stopper rotation amount adjustment ⇒P.6 (Vertical to hammer shanks) ・Hammer shank stopping position adjustment ⇒P.7... -
Page 6: Piano Regulation Caution
3. Piano Regulation -Piano regulation may be done independently from the Silencing mechanism. When pulling an action for tuning and voiving, operate the Silent lever to release the Silent mechanism (Fig.5) and remove the key sensor connector in front of the action. (Fig.6) Fig.5 Fig.6 -Hammer let-off : approx. -
Page 7: Check Regulation And Adjustment Silent Mechanism
4. Check/ Adjustment of Silent mechanism -Adjustment of action in the Silent mode is done with the Silent mechanism engaged. -Switching of silent/ normal play is done with the Silent lever attached to the treble bottom of keybed. -The Silent lever can have the units interlock as listed below. ①The link in the back beam rotates ②The lever link rotates (white plastic) ③Shank stopper drive lever rotates... - Page 8 ◆Hammer shank stopping position adjustment String stroke distance 5 - 6mm Adjustment spot Replacement of the hammer shank stopper cushioning (Normally visual confirmation only is OK.) Shank stopping position: 5 – 6mm from the string Cushioning Thickness (t) Shank stopper cushioning Thickness (t) Component No.
- Page 9 [Regulating rod check / adjustment] ① Pull the Silent lever to activate the Silent mechanism. ② Check and adjust the contact angle of regulating rod. ③ Disengage Silent mechanism and make sure that the regulating rod does not contact the jack. ◆Adjustment of contact angle to regulating rod Angle position Regulating rod (b) and small jack’s knob (a) respectively contact in the...
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Page 10: Silent Let-Off Adjustment
5. Silent let-off (=Hammer let-off in the Silent mode) -Adjust the level of the regulating rod to the position so that jack [A] and [a] as a structure respectively contact [B] and [b] almost simultaneously when the Silent mechanism is engaged (Fig.14). - Page 11 [Silent mode let-off adjustment procedure] Procedure Outline Ref. page Check / adjustment of normal hammer let-off ① ⇒P.5 (approx. 2mm from the strings) Hammer shank stopper adjustment ⇒P.6, 7 ② (5 to 6mm from the strings) Check / adjustment of the regulating rod rotation position ③...
- Page 12 ⑤ At the Silent mode, adjust Silent mode let-off. ・ Make sure to disengage the Silent mechanism and pull out the action. ・ Lift the hammer shanks so they lean toward the front of the keys. ・ Rotate the adjustment screw of regulating rod between the repetition levers to adjust (Fig.16).
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Page 13: Sensor Unit Adjustment
6. Sensor Unit Adjustment -Key sensor unit adjustment (Adjustment is required when the unit is replaced.) Adjust the gap between the bottom surface of a black key and upper surface of the key sensor unit when depressing the black key to the lowest point. Adjustment specification : 3.8mm to 4.0mm ａ... -
Page 14: Maintenance And Test Modes
7. Maintenance and Test Modes ■Maintenance mode (measurement mode) Maintenance mode is a program to adjust the key sensor and damper pedal sensor detection positions by measurement. Measurement by maintenance mode shall be required in the following cases; ・If the detection position is out of standard, when checked in the test mode. ・When replacing the key sensor rail, damper pedal sensor and DM sheet, etc. - Page 15 [Damper pedal sensor measurement] While the damper sensor detection position has been adjusted with VR on the sound sheet for the existing Silent series, this series applies half point position measurement for adjustment. Damper pedal sensor measurement procedure № Measurement/ confirmation Operation Measurement status item...
- Page 16 [Damper Pedal] Pedal at rest : No Buzzer sound Slight pedal depressed : Continuous tone (*1) Pedal half way down : Intermittent tone (*2) Pedal at stroke end : Quick intermittent tone (*3) [Shift Pedal] Pedal at rest : No Buzzer sound Pedal on : Intermittent tone (*2) Pedal at stroke end...
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Page 17: Unit Connection Diagram
・SW Box and Sensor unit communication test When the test starts, the two units (Switch Box and Key Sensor) automatically communicate with each other. C major chord plays if communication is successful. C minor chord plays if communication is unsuccessful. The “Black Key Etude (Chopin)”... -
Page 18: Parts List
Parts List Part Name Part Number Remarks KEY SENSOR UNIT WR599800 KEY SENSOR BOARD WR600000 KEY SHUTTER ASSEMBLY WC368000 PEDAL UNIT LG WR310200 DAMPER PEDAL SENSOR UNIT LG CONNECTOR ASSEMBLY WR687500 ROTARY VARUABLE RESISTOR HS41252R FOR DAMPER PEDAL SENSOR PEDAL UNIT SG WR310300 SHIFT PEDAL SENSOR UNIT SG CONNECTOR ASSEMBLY...