Kawai GS100 Regulation Manual Download

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K A W A I G R A N D P I A N O

R E G U L A T I O N M A N U A L

Ver 1.4 2011/7/21

Piano Laboratory

Supervisor

Kazuo Goka

Summary of Contents for GS100

Page 1: ...１ K AWA I G R A N D P I A N O R E G U L A T I O N M A N U A L Ver 1 4 2011 7 21 Piano Laboratory Supervisor Kazuo Goka ...

Page 2: ...uckls Whippens to Capstan Screws P11 ８ Repetition Spring P12 ９ Jack Alignment Height P13 １０ Key Height P14 １１ Hammer Blow Distance P15 １２ Hammer Rest Rail P16 １３ Hammer Letoff P16 １４ Hammer Drop P17 １５ Key Dip P17 １６ Back Checks P19 １７ Back Stop P20 １８ Repetition Spring re check P20 １９ Balance Rail Studs P21 ２０ Damper P22 ２１ Damper Upstop Rail P24 ２２ Damper Pedal P25 ２３ Sostenuto P26 ２４ Una Corda ...

Page 3: ...ad screws around the outside countersunk Phillips screws on the pinblock section These should be tightened with a 17mm socket for hexagonal screws and Phillips No 4 head for the countersunk screws as with the regular Kawai models Note Shigeru Kawai pianos now use a machine bolt around the rim perimeter This is threaded into a steel plate support and should not need to be tightened Some old Kawai p...

Page 4: ...ction forward glue a shim thin wood veneer onto the hard wood block at the back side of the Keyframe To move the action back file the wood block After the block is set correctly then adjust the keyframe guides in the cheek blocks to match If most hammers are aligned towards the left from strings glue a shim wood veneer or thick paper to the back side ofAction Block ...

Page 5: ...t up position Also check with the keys in the depressed down position Proper gap should be 0 2 mm to 0 3mm with a small but clear knock sensation Easing a tight front hole bushing using key pliers 3 2 Balance hole bushing Check the lateral movement of the keys in the rest position up and in the depressed down position ...

Page 6: ...cks then ease the balance hole This process must be done carefully until the key moves with the desired ease but is not too loose Do not ease the front and back of the balance rail Only ease the sides of the hole by turning the easing tool inside the key so that the flat surfaces face front to back then apply pressure to the hole If the balance hole is loose on the pin apply a few drops of alcohol...

Page 7: ...ht Note It is normal for the keyframe front rail to lift up at the ends during dry weather Be aware of the relative humidity when bedding the keyframe For the back rail remove the keys and tap on the action bracket supports to check for knocking If needed trim the bottom of the back rail at the tight areas with a hand plane or sanding block which will lower the loose areas and eliminate knocking A...

Page 8: ... is not moving straight up Place a piece of travel paper between the flange and hammer rail on the same side of the screw as the direction the hammer is traveling Differences in thickness or length of paper will determine the degree of correction Note the travel paper should not be visible once the flange is screwed back into place Check the hammer angle at rest position If the hammer molding spac...

Page 9: ...shings After the hammer angle is corrected ６ Space Hammers to Strings For single and bi chord notes the hammers should be centered under the strings Note Double check that the soft pedal is adjusted to allow the action to return all the way Press the soft pedal and insert a strip of paper between the keyframe and the action stop block Release the soft pedal and the keyframe will return and trap th...

Page 10: ...ngs In the trichord note section the bass side of the hammer should overlap the left string 1mm For easy hammer spacing put 1mm shim metal ruler between keyframe and action stop block Use the Hammer flange spacer under the pin block while looking down between the strings ...

Page 11: ...d be centered on the repetition lever the capstan on the repetition cushion and the jack on the regulating button To adjust lateral position of the wippen loosen the screw and shift the wippen over or insert a piece of traveling paper behind the wippen flange on the side that you want the wippen to move towards To position the jack tender under the let off button insert traveling paper underneath ...

Page 12: ...arry the hammer back up in a slow easy movement without jumping or catching If the movement is too slow dislocate the top section of the spring and pull upwards If the movement is too fast press the spring downwards as shown When pressing or lifting the spring you need to only change the shape of the coil portion of the spring not the shape of the curve area Always re check the spring strength wit...

Page 13: ...lightly lower than the repetition lever 0 1 mm to 0 2mm When turning the regulating screw depress the repetition lever to avoid damaging the felt button and pad To check repetition lever setting To check the repetition lever height with the hammer in the rest position gently and slowly press down the jack heel The hammer should barely move If it drops but doesn t return when the jack is released t...

Page 14: ... end then level all keys with a straightedge MODELS NEOTEX SKEX EX GS100 68 0mm SK 7 RX 7 68 0mm SK 6 RX 6 RX A RX B 66 0mm SK 2 3 5 RX 2 3 5 66 0mm Place thicker punchings lower on the pin and thinner punching paper above just under the felt punching Square the keys so that the top surfaces are horizontal by tapping the balance pin side to side ...

Page 15: ...on Hold the blow distance gauge between one hammer and the string then adjust the capstan on the next hammer so that it matches the sample The blow distance should be 46mm Once sample hammers are set slide action out and regulate the capstan screws in the remaining hammers to form a straight line Level Hammers in each section using the capstan screws ...

Page 16: ...er letoff Distance To improve accuracy place a light directly above the string and watch the string s shadow on the hammer felt Press each key down slowly with one hand while adjusting the letoff dowel with the other hand to set the letoff distance In the bass section letoff should be 2 0mm 2 5m middle and treble 1 0mm 1 5mm ...

Page 17: ... White Key Dip Using a dip block 10 1mm depress each key and compare with height of the neighboring key Add or subtract punchings until desired dip is achieved Put paper punchings under cloth Make certain that the same pressure is used throughout the key board Move back and forth to re check your finger pressure as you regulate Another way to double check for evenness is to push down 3 keys with 3...

Page 18: ...ck keys Remove or place punchings underneath until the aftertouch feel is the same Put paper punchings under cloth Thicker card and paper should be lowest on the pin thinner paper upper There should be no more than 4 of any one thickness paper Black keys should be about 2mm higher than white keys when black keys pushed down to bottom ...

Page 19: ...s played and the hammer is in check tap the hammer down into the backcheck If the hammer can be pushed down all the way then the backcheck angle is too vertical Alignment Using bending pliers space the back checks so they are even and square to the hammer tails The back check wire must be bent twice once at the bottom and the opposite way at the top The backchecks must be uniformly spaced and thei...

Page 20: ...r key of each section then align the other keys Check to see that the hammer tails do not drag on the back check by moving the key with one hand and pushing down on the hammer with the other If the tail drags adjust the angle of the back check again １８ Repetition Spring re check Re check the repetition spring regulation after setting the backchecks ...

Page 21: ...even pressure for each of the studs For left side stud push Una Corda Pedal slightly to check Start by setting the stud at the tenor break just above the bass section then set the bass end and recheck the tenor break stud again Then move towards the treble right side re checking the previous stud each time Then re check them again with the damper pedal pressed down Finally adjust the 1 or 2 hidden...

Page 22: ...ng the damper wire twice Keep the damper wire and damper head parallel When you push up damper lever slowly the backside of damper should lift up very slightly earlier than front side The damper wire should be at right angles to the bottom surface of the damper head but the damper head should still lift slightly from back first ...

Page 23: ...unching between the pitman and the damper lift rail Adjust pedal rod head to set the sample damper levers so that they start moving when the hammer is 23mm 1 2 blow distance from string Tighten damper wire screws for sample damper levers in each section Reinstall the action and check the damper lift Once the samples are set tighten all damper wire screws then remove paper punching and correct the ...

Page 24: ...op flange and move the damper up or down Do not use the capstan screws for this adjustment ２１ Damper Upstop Rail Press a black key and lift the damper head to see how much movement is remaining 1 to 2 mm is permissible Make certain that the damper levers will not touch the sostenuto rod even if the lever is lifted up strongly ...

Page 25: ...he pedal rod The head and pedal lever should have lost motion of 1 2mm at the damper lever Tighten the bottom lock nut with 10mm spanner while holding the pedal rod Pedal Stop Capstan The dampers should be lifted to the same height with the pedal as they are with the black keys Adjust the pedal stop capstan so that the pedal lift matches the black key lift ...

Page 26: ...ing rod away from the tabs Adjustment should be uniform across the rod from bass to treble When one screw is tightened the other should be backed off by the same amount to avoid unnecessary tension Adjust the lift height sostenuto rod angle with the capstan under the keybed The sostenuto pedal should hold the dampers at the same height as the key Test by pressing the pedal and striking non sustain...

Page 27: ...ble sections The left string should not be struck Shift pedal Adjust with the pedal rod head and tighten lock nut so there is no lost motion in the pedal Adjust the screw in the right cheek block so the action will shift allowing the trichord hammers to clear the left string and all hammers should strike the strings halfway between string marks ...

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