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1. A Figure 4 5 Added tension will result in a stiffer Damper response PNTA Figure 4 5 RHODES Damper Arm Tension Adjustment b Alignment With Tension thus established proper Damper coordination is achieved by bending the forward portion of the Damper Arm up or down Figure 4 6 FEAH HERE Figure 4 6 RHODES Damper Arm Alignment Adjustment There are four possible conditions which could result in malfunction CONDITION SOLUTION The Tine is out of adjustment in its vertical aspect Escapement The factory setting places the Tines slightly above dead center of the Pickup See Timbre Adjustment Page 4 7 The Damper Release Bar is bearing down excessively thus disengaging or partially See Damper Push Rod Assembly Page 2 2 disengaging the Damper from the Tine The Damper Arm has sustained damage sufficient that it no longer bears firmly against Remove Damper Release Bar and disengage Bridle Strap With Damper Arm thus free Tine Tension note if it assumes a position similar to the neighboring Arms If so bend upward slightly on the surface nearest the point where it is mounted to Action Rail The aluminum is of an alloy purposely chosen to invite this type of adjustment Caution should be exercised to avoid excessive correction which would result in some loss of touch control due to the strong resistance thus introduced in opposition to the upward travel of the Hammer The leading edge of the Damper has been bent downward Th
2. 3 RHODES Modular Action Exploded View web derign by badrat file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 ch2 html Page 2 Wednesday May 24 2000 Chapter Three Instructions for Disassembly Page 1 CHAPTER THREE INSTRUCTIONS FOR DISASSEMBLY Access to the specific areas for needed adjustments or repair is easily accomplished by following the procedures outlined here 1 Harp Cover Removal The Cover is formed of A B S material and is practically impervious to damage To remove lift up on the two back corners of the molded top With this done simply pull the front edge free 2 Nameboard Assembly Removal Disconnect Harp Cable from Harp Jack With a 2 Phillips Screwdriver loosen and remove the four 4 screws which mount the Nameboard to the Cheekblocks two 2 of which are found behind the Nameboard on each end After removing screws lift Nameboard Assembly up and away 3 Harp Assembly Removal The Harp Assembly Figure 3 1 consists of three major assemblies The Harp Frame the Tone Bar Rail and the Pickup Rail The Tone Bar Rail and the Pickup Rail are seated into the Harp Frame and secured by fourteen 14 Mounting Screws Two metal Harp Brackets are then mounted to join the two The Harp Assembly is secured to the two aluminum Harp Supports by four 4 Screws two 2 on each end as well as the Harp Pivot Links located on each end Complete removal of the Harp then is accomplished by rem
3. Clearance 4 3 Damper Module Adjustment 4 4 Tension 4 4 Alignment 4 4 Striking Line 4 5 Re Establishing Striking Line 4 6 Timbre Adjustment 4 7 Volume Adjustment 4 7 Chapter5 Tuning The RHODES Piano 5 1 Electronic Tuning 5 2 Stretch Tuning 5 3 How to Follow The Chart 5 5 Chapter 6 Repair Procedures and Techniques 6 1 Tone Generator Assembly Replacement Procedure 6 1 Key Pedestal Modification Procedure 6 4 Worn Key Bushing Repair Procedure 6 7 Key Cap Replacement Procedure 6 8 Full Skirt Type Key Cap 6 9 One And Two Piece Type Key Cap 6 9 Section II Early Design RHODES Piano Chapter 7 Early Design RHODES Piano Tone Source Prior to July 1975 7 1 The Tine 7 2 Chapter 8 Early Design RHODES Pianos Action Prior to September 1975 8 1 The Action 8 1 Chapter9 Early Design RHODES Pianos Maintenance and Rejuvenation 9 1 Chapter 10 Early Design RHODES Pianos Dimensional Standards and Adjustments 10 1 Key Dip 10 1 Damper Control 10 2 Escapement 10 2 Signal Strength 10 4 Section III Electrical and Electronic Service Aids Chapter 11 Diagrams Schematics and Pictorials 11 1 List of Illustrations N ADET Title Nusnber 1 1 Tuning Fork Comparison 1 1 1 2 RHODES Tuning Fork 1 1 2 1 RHODES Modular Action Single Key View 2 1 file Macintosh 20HD Desktop 2 0Folder Fender 2 0Rhodes 2 0 Manual 20 C4 toc html Wednesday May 24 2000 Rhodes Service Manual Table of Contents RHODES Damper Modules Bass Mid and Treble Configuratio
4. Cloth WARNING Prior to using the Silicon Spray and Naphtha Based Solvent place a drop of each on the side of a Hammer to determine that no adverse effect will result from the chemical reaction with the plastic file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch6 html Page 2 Wednesday May 24 2000 Chapter Six Repair Procedures and Techniques Page 3 3 Place the Action Rail with Hammers and Dampers intact up side down to allow for easy access to the Felt on the Hammer Butt Saturate each Felt with Silicon Spray two or three times allowing 10 minutes soaking interval between each saturation application When the Felt s adhesive has been sufficiently reduced slide each piece off from the Hammer Butt Thoroughly clean each Hammer Butt with a clean cloth soaked in the Naphtha Based Solvent making sure that all trace of the adhesive is removed a o SY SS Using a clean cloth soaked in the Naphtha Based Solvent thoroughly wipe each Key Pedestal relieving them of any trace of dust and or lubrication that may have previously been applied 8 Remove the Replacement Felts from the package and arrange in a straight line on a flat surface 9 Measure 5 32 3 969mm in from one edge of the Felt Strip Figure 6 3 and slice along the strip of Felts with a sharp knife ensuring that both pieces retain the protective paper backing Lay aside the 1 13 32 35 719mm Felt Strips Figure 6 3 Felt Strip Cutting Li
5. PIANO Page 5 1 file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 20Manual 20 C4 ch4 html Wednesday May 24 2000 Chapter Five Tuning the Rhodes Piano Page 1 CHAPTER FIVE TUNING THE RHODES PIANO Generally speaking it can be said that the Piano will not go out of tune Certainly it does not go generally out of tune over the entire Keyboard as does the traditional string piano What may happen is that one or more notes may go out of tune because of a loose Tuning Spring or as a result of Tine fatigue under the stress of constant heavy blows Under these conditions tuning simply requires pitch comparison with the tone an octave below and shifting of the Tuning Spring until pitch alignment is achieved In the case of extreme Tine fatigue the Tine should be replaced An extremely helpful feature is the easy removal of the Tone Generator Assembly Tine portion from the Tone Bar by unscrewing the Tone Generator Mounting Screw thus should a Tine become damaged for any reason replacement will be easy and inexpensive Replacement Tone Generator Assemblies are available in Kit form with the Tine 4 3 8 inches 111 125 mm in length This length Tine will accommodate the Heavy Traffic area where the highest incidence of fatigue and breakage is likely to occur These can be cut to desired length with a pair of side cutters For detailed removal and replacement procedures refer to Chapter 6 Page 6 1 On each Tine there is a crimped coil
6. There is a slot on the top surface of the Sustain Rod providing screwdriver adjustment on the top of the Amplifier Enclosure DAMPER MODULE The Damper Arms are now provided in fixed multiples of twelve known as Damper Modules Figure 2 1 17 This change was made to preclude the possibility of side shift in shipping and is the epitome of simplicity It consists of tempered aluminum stamped into Modular configurations to accommodate the Damping requirements in Bass Mid and Treble ranges Figure 2 2 ty ee i feted tere my pre eek err J Eei 4 ae id a G aik E G S 1 i i I E l sal cea pgpgnnannnnn Figure 2 2 RHODES Damper Modules Bass Mid amp Treble Configurations The Bass Damper Module is shortest with full width Arms to provide the strength and tension needed to properly damp the long Tines in the Bass area Progressing up the Keyboard to the Treble the Tines become shorter and therefore the Damper Modules are designed to provide graduated strength and tension according to the need throughout the range of the Keyboard In keeping with the various damping requirements the Damper Felts as well are designed to accommodate the three areas the Bass with long wide Felts the Middle with Felts of medium length and width and the Treble which uses short narrow Felts file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch2 html Wednesday May 24 2000 ACTION RAIL Chapter Two
7. Tine responds visibly to the blow of a Hammer by vibrating in a wide arc at a certain frequency RHODES TUNING FORK TYPICAL TUNING FORK TUNING SPRING Figure 1 1 Tuning Fork Comparison The upper leg Tone Bar while not so visible does vibrate at the same frequency The importance of this upper leg can easily be demonstrated by the following simple experiments 1 Strike any note preferably in the mid range of the Piano With the Sustain Pedal down squeeze the upper leg with the fingers The tone will die immediately 2 Perform the same experiment but this time touch the upper leg very lightly The vibration will be distinctly felt under the fingers This patented concept of the tuning fork offers many advantages Figure 1 2 One of these is that the upper leg Tone Bar supports some pitch variation in the lower leg Tine In other words assuming G to be the target pitch the lower leg could be deliberately tuned to F F G G or A without any appreciable loss of support from the upper leg This opens up a world of possibilities as will be shown g Figure 1 2 RHODES Tuning Fork You will note a small coil Spring on the lower leg so designed as to be a tight fit This coil Spring acts as a counter weight and therefore as a pitch control Moving this Spring will result in a change of pitch By this means then it is possible to arrive at a fine tuning merely by sliding the Spring to the desired spot on the Tine See Tu
8. as follows a Examine the condition of the Hammer Heads If the grooves are not more than 3 16 4 762mm deep they can be reshaped by sanding off the outer surface To accomplish this construct a shaping tool from a 6 152 4mm length of wood to which has been cemented a piece of very rough sand paper Beginning at Points A and Al work upward toward the crown taking off enough of the outer layer of felt to remove all trace of the groove Figure 9 1 _ ae GAGE DEF IH Tee U A LEGH Figure 9 1 Tear Drop Hammer Head Groove Removal It should be noted that by the method chosen in this shaping process you have a measure of control over the striking line the point of Hammer contact along the length of the Tine Suppose Point A Figure 9 2 is the optimum point for best tone and volume response You can shape the Hammer so that the peak of the felt is left or right of center in order to accommodate to Point A You can determine the exact location of Point A by removing all the Mounting Screws from the Harp so that it can be slid back or forward on the Support Blocks With the Harp free to move slide it back or forward as you strike the Key until you locate the point of maximum power response Next mark this point on the Tine with a felt pen slide the Harp to original position with Hammer raised mark a spot on the Hammer Tip where the Felt Tip should be shaped This procedure should be repeated about every 6th Hammer throughout the scal
9. drill Secure the Harp by re installing the Harp Mounting Screws 5 Attach the Harp Pivot Link by re installing the Harp Pivot Link Mounting Screw along the thread grooved slot on the side of the Harp Support 6 Mount the Harp Keybed Assembly in the Cabinet by reversing the disassembly procedure outlined in Chapter Three TIMBRE ADJUSTMENT Timbre Adjustment is accomplished by manipulating the Timbre Adjustment Screw Figure 2 1 9 until the end of the Tine rests on a plane slightly above dead center of the Pickup Figure 4 8 Let your ear guide you in this procedure HINE More P ri 1 A daa F m a i a Loe Uha PURE PUNO l AMINE CP Tee FU CWE Teeca ETTE Pieter A Figure 4 8 Timbre Adjustment Diagram VOLUME ADJUSTMENT Slide Pickup Arms in or out to establish a gap between Pickup and Tine of between 1 16 1 588mm and 1 8 3 175mm as shown in Figure 4 9 taal LOR WL Lal EE TO Lose Figure 4 9 Volume Adjustment Diagram It should be noted that the smaller the gap between Tine and Pickup the greater the volume of sound More important the more pronounced the DY NAMIC RESPONSE By Dynamic Response is meant percentage of volume increase in response to increased weight of touch In Pianos built since March 1972 a gap of 0 020 0 5080mm can be accommodated in the middle and upper ranges NOTE When Timbre and Volume Adjustments are made Pitch should be re established See TUNING THE RHODES
10. enough acceleration to the Hammer to enable it to reach the Tines Now reverse the situation suppose that we reduce the Escapement to zero The lightest feather touch will produce a sound However sustained finger pressure on the Key will cause the Hammer to smother the sound Now back off a bit Raise the Escapement to the point where the Hammer can no longer smother the sound This becomes the ideal setting To achieve the ideal Escapement setting there are several adjustments possible depending upon the vintage Piano involved a To decrease the Escapement distance compress both Escapement Adjusting Springs Figure 4 4 This will lower the entire Tone Bar Assembly thus reducing the gap Once this is accomplished re establishment of Timbre and Volume setting is done in the usual way b If the Escapement is excessive throughout the entire Piano proceed as follows 1 Remove the two Side Support Blocks Figure 10 2 file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 20Manual 20 C4 ch10 html Wednesday May 24 2000 Chapter Ten Early Design Standards amp Adjustments Page 2 li 1 asi Fi BAALEFTE F PASSER F a me HANE fae ae aE seria Se Do En Fainc Figure 10 2 RHODES Early Design Harp Action Assembly Exploded View 2 Using a table saw shave off the desired amount from the top surface of each Block approximately 1 16 11 588mm to 1 8 3 175mm 3 Replace the Assembly then reset the Dam
11. m e _ O diae EA GOAT i mmi CHIN E gt Acton nan mQUNTIEG HAEN ENT AT ERT RATE NA EAE BAR ga POCAPEMENT l eh ADT Se E ACAH ae i DAMPER MEANE SHELE _ fa 4 BERRY ENOUOH TO ae a 7 i ENED TY DANG THE TERE PRK Figure 10 1 RHODES Early Design Single Key Views 2 Damper Control The Damper ideally clears the Tine by at least 3 8 to 1 2 9 525mm to 12 700mm when the Key is depressed Conversely when the Key is at rest the Damper should bear firmly on the Tine in order to effectively damp the sound To maintain this relationship there are two adjustments possible a Tension Refer to Page 4 4 b Alignment Refer to Page 4 4 3 Escapement Escapement is the word used to describe the distance between the striking edge of the Hammer Tip and the Tine when the Key is fully depressed This distance varies from between 3 16 4 762mm and 3 8 9 525mm in the Bass section to between 1 16 1 588mm and 1 8 3 175mm in the Mid section and between 1 32 0 794mm and 3 32 2 381mm in the Treble section The shorter the Escapement distance the more sensitive the touch The Escapement distance could be called the free throw area In other words this is the area of Hammer travel after the energy imparted by the touch is no longer effective In order to understand the philosophy suppose the Escapement distance were 1 2 12 70Omm Under this condition it would require an extremely sharp blow to impart
12. of our original patent No 2 972 922 the Tone Source is described as a tuning fork of unequal legs In other words we deviate from the traditional concept of a tuning fork in that while both legs of the fork vibrate at the same frequency the lower leg is more resilient and as a consequence responds more positively to the blow of a Hammer It is to our advantage to construct this lower leg in such a way as to render it as resistant to wear and fatigue as possible In pursuit of this the Tone Bar Assembly has gone through three major changes through the years 1 In the original Piano the Tone Bar Assembly tuning fork was a single piece of cast iron which was suspended in a metal channel The bottom leg was a length of piano wire of a diameter of 075 1 905mm Figure 7 1 m pmr S FEL a SHARC pa i a lt n Figure 7 1 RHODES First Stage Tone Bar Assembly 2 In the next stage the Assembly was constructed as shown in Figure 7 2 Several improvements were accomplished by this change a The Tone Generator Assembly Figure 7 2 was now removeable for easy replacement b Timbre adjustment was more easily accomplished c Escapement distance was more easily adjusted 3 In an attempt to further improve the tone quality and at the same time to reduce weight we came up with the current Tone Bar design which we call the twisted steel bar patent No 3 644 656 Figure 7 3 TEHE ban a I b a a a J i _
13. pluck both Middle C and C an octave below slowly slide the Spring back Se e As you do this you will observe the following phenomenon As the upper C approaches synchronization with the low C you will notice a beat As the middle C approaches maximum synchronization the speed of the beat will reduce 7 Continue this process until there is no longer a discernable beat Repeat this entire procedure several times until you become familiar with the technique With some practice you should be able to restore pitch synchronization within five seconds 8 Proceed up and down the Keyboard precisely as you would with a string piano The job will be much easier in this case since there will be no need to tune unisons ELECTRONIC TUNING There are several brands of electronic tuning devices on the market Most of these operate roughly on the principle of the strobe light There is a spinning disk the speed of which is accurately calibrated A control knob allows for scale tone changes Assuming you set the control dial at C there is a microphone which hears the pitch of the Bar you are tuning Its vibrations are interpreted as flashes of light These in turn are superimposed on the spinning disk If the two are in synchronization the wheel will appear to be stopped If the Tone Bar is high in pitch the wheel will appear to rotate clockwise etc Moving the Tuning Spring downward will slow the speed of the Tine This will cause the strobe wheel to slow its m
14. EASE BAR The Damper Release Bar Figure 2 1 22 provides a foot activated mechanical means of disengaging all Dampers allowing all Tines to vibrate freely CE E ee om ese see a 4 A REFERENCE DESIGNATION 1 Front Guide Pin Felt 15 Hammer s 2 Front Guide Pin 16 Bridle Strap oS ne 3 Key Cap 17 Damper Module 29 Action Rail A gt ey 1e per e 30 Harp Support To Action Balance Rail Felt 19 Tuning Spring Rul Mouniine Serew 6 Harp Support 20 Pickup Assembly Ji Dampet Ma Haa 7 Tone Bar Assembly 21 Pickup Adjustment l Moanin Sore Mounting Spring Brew 32 Push Rod Assembl 8 Tone Bar Assembly 22 Damper Release Bar Ton Felt y Mounting Grommet 23 Damper Release Bar 33 Pach Rod Asembli 9 Tone Bar Assembly Pivot Pin 34 Push Rod ec cable Adjustment Screw 24 Damper Release Bar Balance Pavol y 10 Tone Generator Pivot Pin Locking 35 Puch Rod Assent Mounting Screw Screw Bottom Felt y 11 Tone Bar 25 Damper Release Bar BE Achion Rail Minin 12 Tone Generator Felt Nut 8 Assembly 26 Multiple Hammer 37 Keybed Felt A Di l Flange 38 Key Pedestal Hammer Tip 27 Key Pedestal Felt Figure 2 1 RHODES Modular Action Single Key View The Damper Release Bar is locked in place by two Pivot Pins Figure 2 1 23 which slide into two bushed holes provided in the aluminum Harp Supports Figure 2 1 6 These pins are held in place by two locking Screws Figure 2 1 24 DAMPER PUSH ROD ASSEMBLY The Damper Push Rod Assemb
15. Piano Harp Frame to The Harp Supports Figure 4 7 and stand the Harp vertically on its edge Consult the cutting chart Figure 6 2 in the Tone Generator Assembly Replacement Kit and cut the Tine to length with a pair of sharp side cutters Mount the Tuning Spring NN NN A Secure the new replacement by installing and tightening the Tone Generator Mounting Screw 7 Turn on the Amp with the Volume at maximum setting 8 Re set Volume by loosening the Volume Adjustment Screw with 1 4 6 350mm wrench and sliding the Pickup Arm in or out as you play 9 Re set Timber tone color by rotating the Timbre Adjustment Screw with 2 Phillips screwdriver as you play 10 With your left hand pluck the Tine an octave below the Replacement Assembly With your right hand pluck the Replacement Tine and slide the Tuning Spring until pitch alignment is accomplished file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 ch6 html Page 1 Wednesday May 24 2000 11 Check for pitch once more Chapter Six Repair Procedures and Techniques TINE CUTTING MEASUREMENT AREA __ _ TINE CUTTING MEASUREMENT AREA Figure 6 2 Tine Cutting Measurement Chart 12 Secure Harp and replace Harp Cover Since absolute contact between the Tone Generator and the Tone Bar is necessary the Tone Generator Assembly Mounting Screw is installed at the factory with power equipment In some cases removal of this scr
16. RHODES Suitcase Piano Top Bottom View 8 Action Rail and Harp Support Removal 10 11 C d NOTE The Action Rail is securely locked to both Harp Supports by means of the Harp Support To Action Rail Mounting Screws While these Screws can easily be removed it is suggested that the two Harp Supports and the Action Rail be maintained as a 3 piece Assembly Place the Keyboard on its bottom surface as in a playing position Remove the Captive Washer Nuts that secure the Harp Supports to the Keybed Exercising care not to lose the T Nuts from the under side remove the Action Rail Mounting Screws Grasp the Action Rail with both hands and lift off the three piece assembly Harp Support Removal a b C Disassemble Piano as outlined through 7 b Remove the Harp Support To Action Rail Mounting Screws Lift Harp Support up and away from Action Rail Cheekblock Removal This operation is accomplished by removing both the front and rear Cheekblock Mounting Screws Key Removal After removing the Nameboard Assembly simply lift up on the front of the Key to free it from the front and center Guide Pins then pull the Key out from under the Hammer file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch3 html web devige oy DOCIOE Page 2 Wednesday May 24 2000 Chapter Four Dimensional Standards and Adjustments Page 1 CHAPTER FOUR DIMENSIONAL STANDARDS AND ADJUSTMENTS This
17. S Original Action Design The Hammer Head was of the conventional tear drop design The Hammer Shank and Hammer Butt were formed from wood and therefore tended to suffer the weaknesses of wooden parts such as off center holes drifting holes warping etc An interim change involved the insertion of an aluminum clip Figure 8 2 A on top of the Key Pedestal This was done to increase the acceleration of the old Hammer design E eh Ns Ppa FEET STH a a a a x i Fi a Eu it lee Ta wh oe i A Pe ae Lie a i Lia p a f F iE oe a P E Figure 8 2 RHODES Second Stage Action Design The next generation of Hammers featured a molded Shank and a molded Flange Figure 8 3 These parts were made of CYCOLAC a material which has withstood the test of time and has proven to be dimensionally far superior to its predecessor besides being practically impervious to variations in temperature and weather At this same time the Felt Strip originally attached to the cam curve of the Hammer was instead placed on the newly designed Pedestal surface of the Key FLANGE DANK ae 4 ELT AAR Figure 8 3 RHODES Third Stage Action Design The tear drop Hammer Head was excellent for standard pianos however it tended to wear a groove and as the groove deepened the quality of sound deteriorated Replacement was cumbersome and costly While this type of Head was retained for awhile another innovation followed soon Figure 8 4 It consiste
18. S are 1 Method of Tone Production As will be shown in detail the Tone is produced by a series of modified tuning forks one for each note referred to as Tone Bar Assemblies Each such assembly lies adjacent to an adjustable Pickup The Pickup Coils are all alike and are adjustable as to gap very much as are the points on the Distributor of an automobile Because of the unique construction features each note can be adjusted for Volume Timbre and Pitch 2 The Action Consisting of only three moving parts the Action is unique in design While the structure and materials used have changed the concept has remained unchanged This Manual has a two fold purpose one as a maintenance and repair guide and two as a detailed description of the various vintage models together with instructions for upgrading and modernizing the various models wherever possible web devige oy DOC FOE file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 toc html Wednesday May 24 2000 Chapter One The Rhodes Tone Source Page 1 CHAPTER ONE THE RHODES TONE SOURCE The unique tone of your RHODES Piano derives from the principle of the tuning fork While the common tuning fork has two legs of equal length and mass the tuning forks in your RHODES Piano differ from these in one very important way Figure 1 1 The two prongs of our tuning fork are not of the same mass shape or size They are alike only in pitch The lower more resilient leg
19. Spring so fitted that it can be moved by hand with some effort Figure 5 1 By design it fits tightly enough to resist normal stresses Ideally it remains fixed firmly in place unless deliberately moved a eee fee Lae ae r TUNING SPRING Figure 5 1 RHODES Tone Bar Assembl This Spring acts as a counter weight and thus provides a vernier control of pitch Moving it outward away from the fixed end of the Tine will cause a drop in pitch Conversely moving it inward toward the fixed end of the Tine will cause a rise in pitch The total range thus achieved could be as much as 1 1 2 steps above or below optimum Theoretically and ideally once set the pitch remains unchanged until deliberately altered by purposed relocation of the Tuning Spring counter weight Pitch control by this means is not as difficult a task as with a standard piano The novice is invited to test his skill by taking the following steps 1 Remove the Harp Mounting Screws and rotate the Harp to a vertical position Figure 5 2 oer TONE BAR RAIL T Figure 5 2 Harp Position For Tuning The RHODES 2 Mark the letter names of the Tone Bars on the Tone Bar Rail 3 With the amplifer and speaker on and volume up pluck the Tine at Middle C with the finger of the right hand At the same time pluck C an octave below Middle C with the left hand Move the Tuning Spring at Middle C slightly upward so as to cause a slight rise in pitch As you continue to
20. The Rhodes Modular Action With the Damper Release Bar and the Damper Modules removed the new Action Rail Figure 2 1 29 is revealed to be a sturdy extremely accurate aluminum extrusion HARP SUPPORTS The new Harp Supports Figure 2 3 9 are fabricated from heavy aluminum extrusions sturdy enough to hold the assembly in place undamaged by a direct six foot drop MULTIPLE HAMMER FLANGE The Hammer Flange Figure 2 3 18 is molded in multiples of twelve This also was redesigned in this manner to preclude the possibility of side shift in shipping It should be noted that the Multiple Flanges are molded of a hard A B S material with a 15 teflon content thus providing lifetime lubrication ON RR O 00 SI DAN A Keybed Cheekblock Cheekblock Rear Mounting Screw Harp Support Mount ing Screw Keybed Mounting Screw Captive Washer Mount ing Nut Harp Support to Action Rail Mounting Screw Washer Harp Support Nylon Pivot Bushing 11 12 13 14 15 16 17 18 19 20 Damper Release Bar Pivot Damper Release Bar Pivot Mounting Screw Damper Module Mounting Screw Damper Module Damper Felt Hammer Flange Mounting Screw Multiple Hammer Flange Hammer Hammer Tip ZI 22 23 24 25 26 2I 28 REFERENCE DESIGNATION Action Rail Key Nameboard Mounting Screw Nameboard Key Cap Guide Pin Guide Pin Felt Cheekblock Front Mounting Screw Figure 2
21. Wednesday May 24 2000 Rhodes Service Manual odes Keyboard Instruments U S A SERVICE MANUAL RHODES Keyboard Instruments U S A Post Office Box 4137 1300 East Valencia Fullerton California 92634 714 879 8080 Copyright 1979 CBS Musical Instruments A Division of CBS Inc P N 34 0119 000 Printed in U S A Frames 800 X 600 No Frames 640 x 480 Rhodes Help Desk This manual was scanned using OCR and may be subject to typographical errors Report any problems or comments to badrats badrat com file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 20 Manual 20 C4 index html web deiga oy OOOO Page 1 Wednesday May 24 2000 Rhodes Service Manual Table of Contents Page 1 Table of Contents Section I Latest Design RHODES Piano Chapter 1 The RHODES Tone Source 1 1 Chapter2 The RHODES Modular Action 2 1 Damper Release Bar 2 1 Damper Push Rod Assembly 2 2 Damper Module 2 2 Action Rail 2 3 Harp Supports 2 3 Multiple Hammer Flange 2 4 Chapter 3 Instructions For Disassembly 3 1 Harp Cover Removal 3 1 Nameboard Assembly Removal 3 1 Harp Assembly Removal 3 1 Damper Release Bar Removal 3 1 Damper Module Removal 3 2 Hammer Removal 3 3 Removal of Keyboard Assembly from Cabinet 3 3 Stage Piano 3 3 Suitcase Piano 3 4 Action Rail and Harp Removal 3 4 Harp Support Removal 3 5 Cheekblock Removal 3 5 Key Removal 3 5 Chapter4 Dimensional Standards and Adjustments 4 1 Key Dip 4 1 Escapement 4 1 Damper
22. a FUL BEIRT GLAS Figure 6 8 Key Identification Chart To remove the Cap a sharp X acto type knife is used to cut between the Cap and the wood of the Key Always slice with the grain of the wood so as to minimize cutting the wood Carefully slide the knife between the Cap and the Key Moving slowly with light pressure slide the knife under the Cap from one end of the Key to the other causing the Cap to come loose from the Key but not peeling or cutting any wood from the Key itself For the One piece type Cap and the front of the Two piece type if removal is necessary also slide the knife between the front of the Key and the Cap carefully removing the front of the Cap without damaging the Key After the Cap has been removed scrape or sand the glue and Cap residue from the Key Also make sure any damage to the Key is repaired add wood putty to any gouges etc Make sure the Key surface is as smooth and level as possible Apply the glue liberally to the surface that is being capped Spread the glue so that there are no air gaps Carefully place the new Cap on the Key Slide the Cap across the Key slightly to help spread the glue Align the new Cap on the Key so that there is equal overhang on both sides of the Key and that the relief area of the head of the Cap is flush with the relief area of the head of the Key The head of the Cap at the front should then overhang the front piece on a Two piece Cap by approximately 1 16 1 588mm On
23. atherstrip Adhesive No 8001 available at auto supply stores or a similar bonding agent cement the Neoprene Tips following instructions given in the Hammer Tip Replacement Kit 1 Remove all Tone Generator Assemblies by removing all Tone Generator Mounting Screws Figure 8 1 2 Mount all new Tone Generator Assemblies following instructions given in the Tone Generator Assembly Replacement Kit 3 Adjust Timbre See Timbre Adjustment Page 4 6 Adjust Volume See Volume Adjustment Page 4 6 The Felt Tips are slightly taller than the Neoprene Tips so escapement must be re established See Page 4 1 Remove the Harp Mounting Screws including the Hinge Screw on the left Bass side of the Harp Figure 9 6 9 a o Aa y e Refer to Step 3 Page 4 6 8 When you have located this new Harp position to your satisfaction sink two new holes in the maple Side Support Blocks use a No 10 drill then secure the Harp by remounting the Screws Next remount the Hinge by drilling a new hole No 10 in the side of the Harp Frame Exercise extreme care in guiding your drill through the steel so as to avoid plunging the drill into the Pickup If the Harp Action Assembly is out of the Cabinet a new hole can be drilled in the side of the Harp Support Block to relocate the Hinge thus avoiding the possibility of damaging the Pickup Fi 5 Ss i 4 SIFORT Sg a ee a a i E l HLE SLAPPOHT ELOCH arii T ri F CREA i e file Macintos
24. chapter deals with the important dimensional standards for maximum performance of your RHODES Piano and adjustments available to maintain that performance 1 Key Dip The distance of downward travel of the Key Front Figure 4 1 1 is called Key Dip This dimension should be 3 8 1 32 that is from 11 32 to 13 32 9 525 0 794mm or 8 731mm to 10 319mm a res ee a an LJ i AL a ores EBIIEITIIIIITIIII TIIS J iri Figure 4 1 RHODES Modular Action Single Key Depressed CAUTION When Key Dip is changed reestablishment of Escapement and Striking Line is required 2 Escapement The gap remaining between the Hammer Tip and the Tine Figure 4 1 3 with the Key depressed is called Escapement This Dimension varies from the extreme Bass left Tone Bar to the extreme Treble right Tone Bar and should be as follows Figure 4 2 f 7 R A ia Toi i le eee Las fo mar EXTREME FASS TOE SA fi IONE FLAT a EXTAHEME THEBLE TORE Baa i PES ere AA Pa Bt Wie 568i SAMA Wc eee MINI IE Arma MAXIMUM MIP TA Sete ME O Jir 23km MAKMA Figure 4 2 Escapement Distances The philosophy behind this variation is that while the ideal Escapement for the most responsive touch is 1 32 0 794mm the whipping action of the Tine in response to the Hammer blow increases as it becomes longer toward the Bass end of the Keyboard making this ideal setting impossible In order to maintain touch sensitivity thro
25. d of a wooden Head with a Felt Tip which was easily removed for replacement This was a major step forward in that replacement could be done inexpensively by the musician Sarr EMT aur PANT A rine lea P DRAFTEN p GREM 3 2 J BLT ited Sn Pw fb 4 gF a aie CAME Apk T HN il h Ar Fas a HAMMER FLARE J tin ane i FELT TT i s J i i HAMLE gaa a J HEAD La 7 Figure 8 4 RHODES Fourth Stage Action Design At the same time research was going on with a type of Neoprene which would be a useable substitute for the felt Tips Felt being what it is was still subject to grooving The formation of a groove is costly in tone production since the walls of the groove act as dampers It was hoped that a material could be found which would end the problem of grooving The Neoprene Tips proved superior in every way and were introduced into the line early in 1971 following extensive testing file Macintosh 20HD Desktop 20Folder Fender 2 0Rhodes 20Manual 20 C4 ch8 html Wednesday May 24 2000 Chapter Nine Early Design Rhodes Pianos Maintenance Page 1 CHAPTER NINE EARLY DESIGN RHODES PIANOS MAINTENANCE AND REJUVENATION This Chapter of the manual will be devoted to maintenance procedure and to description of the ways in which the various vintage models can be adapted to newer standards 1 Suppose you have a Piano of the vintage depicted in Figure 8 1 and wish to bring it up to current sound standards Proceed
26. e The intervening Hammers can be shaped to the curve thus developed PONT Figure 9 2 Tear Drop Hammer Head Reshaping to Striking Line b Next test Felt hardness by playing the Piano through the mid range If the tone quality is harsh indicating excessive hardness of Hammers the Felts can be softened by the Voicing process This is accomplished through the use of a Voicing tool available in any piano supply house Failing this embed a common sewing needle in a hand drill then drill the needle directly into the Felt at several points in the striking area c If the Hammer Heads are too badly worn for salvage remove all Hammer Assemblies and install Replacement Hammer Assemblies The Hammer Assembly will come complete with Flange and Bridle Strap mounted It will appear as shown in Figure 8 4A without Tip Proceed as follows L 2 Remove all Damper Shoes by sliding forward Figure 7 1 Unscrew Flange Screw and remove Hammer by sliding Bridle Strap out over Damper Arm Mount the new Hammer Assembly by sliding the new Bridle Strap over the Damper Arm then by securing the Assembly with the Flange Screw Slide all Damper Shoes back into place Create a 1 8 x 3 8 x 3 8 3 175mm x 9 525mm x 9 525mm shim and glue into place on the Hammer Head as shown in Figure 9 3 This is necessary in order to bring the Hammer Tip up to the full height of the one replaced 3 _ WEOPRENE eT TIP BRIDLE STRAP fi
27. e leading edge referred tois With Bridle Strap in place and having determined that none of the first three conditions that portion of the Damper Arm which extends forward from the Bridle Strap tongue and exist notice whether the particular Damper Felt is in approximate vertical alignment with thus actually provides adjustment possibilities in terms of higher or lower setting of the the neighboring Felts If not with the fingers of two hands bend this portion of the Damper Felt Alignment Damper Arm upward while exercising care that in doing so you do not disturb the configuration of the back portion of the Damper Arm and thus inadvertantly introduce the previous condition 5 Striking Line Striking Line is the term used to describe the best place along the length of each Tine to aim the striking edge of the Hammer Like the sweet spot of a baseball bat there is a point of maximum response This was determined by a painful trial process and resulted in the precise curve given to the Tone Bar Rail Proper Striking Line is assured by setting the Harp in such a way as to arrive at an approximate dimension of 2 1 4 57 150mm between the leading edge of the Hammer Tip file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 2 0 Manual 20 C4 ch4 html Wednesday May 24 2000 Chapter Four Dimensional Standards and Adjustments Page 3 and the leading edge of the Tone Generator Figure 4 1 2 This dimension should be taken at the extreme Bas
28. er 9 3 Double Shoulder Hammer Head 9 4 RHODES Early Design Harp Action Assembly Cut Away View 9 5 RHODES Early Design Single Key View 10 1 RHODES Early Design Harp Action Assembly Exploded View 10 3 RHODES Original Pickup Coil Series Parallel Arrangement 10 4 RHODES Modified Pickup Coil Series Parallel Arrangement 10 4 RHODES Bus Wire Re Routing Diagram 10 4 Schematic Preamplifier Assembly 100 Watt Suitcase and Janus I 11 2 Printed Circuit Board Preamplifier Assembly 100 Watt Suitcase and Janus I 11 3 11 4 Schematic Dual 50 Watt Power Amplifier 100 Watt Suitcase and Janus I 11 5 Schematic Power Amplifier Janus I 11 6 Printed Circuit Board 15 Volt Regulator 100 Watt Suitcase and Janus I Power Amplifier 11 7 11 8 Printed Circuit Board 50 Watt Power Amplifier Suitcase Piano 11 9 11 10 Printed Circuit Board 50 Watt Power Amplifier Janus I 11 11 11 12 Schematic Preamplifier 80 Watt Suitcase and Super Satellite 11 13 Schematic Power Module 80 Watt Suitcase 11 14 Schematic Power Supply Regulator Assembly Peterson Design 80 Watt Suitcase 11 15 Circuit Board Assembly Power Supply Regulator Peterson Design 80 Watt Suitcase 11 16 Schematic Power Amplifier Master and Slave Super Satellite 11 17 Schematic Power Control Panel Master Super Satellite 11 18 Schematic Power Control Panel Slave Super Satellite 11 19 Schematic Converter Kit I 11 20 Schematic Converter Kit II 11 21 Schematic Prea
29. erred for the One and Two piece style cap Piano key cement is available at piano parts and supply companies If piano key cement is not readily available Duco cement will work acceptably If white piano key cement is not available you can make a glue that dries white by mixing Duco cement with 30 acetone and adding small Key Cap chips and shavings from the broken Key Caps Place the Duco in a sealable container Add enough acetone to increase the total volume 25 to 30 Add in the broken chips and stir As the chemical dissolves the plastic continue to add more chips and allow them to dissolve Continue stirring and adding chips until you are satisfied with the color of the glue Before using the glue make sure all plastic chips are dissolved The texture should be thick and smooth about the consistency of syrup FULL SKIRT TYPE KEY CAP To replace the Full skirt type Cap Figure 6 8 B it is first necessary to remove the old Cap Since the Cap is damaged it is of no consequence if you break the Cap further when you remove it Using pliers and a sharp knife break the Cap off piece by piece all the white being careful not to chip or otherwise damage the Key itself After the old Cap is removed sparingly apply piano key cement to the appropriate part of the Key After the glue has been applied slide the Cap on to the Key making sure that it is pushed in place so that the end of the Key is against the inside front of the Cap Put rubber band
30. ew will seem almost impossible however it can be accomplished in the following manner 1 Remove both Screws mounting the complete Tone Bar Assembly to the Tone Bar Rail 2 Place Screws Grommets Washers and Mounting Springs in a safe place to avoid loss 3 Set Tone generator between jaws of a bench vise and tighten jaws securely 4 With a 5 16 7 938mm ratchet wrench loosen and remove Tone Generator Mounting Screw In the event that a bench vise and a 5 16 7 938mm ratchet wrench are not available the Tone Bar may be held in one hand while loosening and removing the Tone Generator Mounting Screw with the other using a 5 16 7 938mm box end wrench Tone Generator Assembly Replacement requires only the reversal of the preceeding procedure KEY PEDESTAL MODIFICATION PROCEDURE In June 1978 the present Key Pedestal configuration Figure 2 1 38 was incorporated into the Piano This development provides smoother faster action or feel Pianos built prior to that time may be modified by carefully pursuing the following procedure 1 Remove Action Rail by following procedures outlined on Page 3 4 Maintain Hammer Assemblies in their mounted position 2 Locate Action Rail on bench well away from other parts of the Piano and other equipment that may be harmed by the chemicals to be used Materials required for this procedure are Silicon Spray e Naphtha Based Solvent Solution i e Lighter Fluid Clean Absorbent
31. h 20HD Desktop 20Folder Fender 2 0Rhodes 20Manual 20 C4 ch9 html Wednesday May 24 2000 Chapter Nine Early Design Rhodes Pianos Maintenance 1 Tines 6 Pickup Arms 2 Dampers 7 Pickup Mounting Screws i gt ee eae ae oe 3 Harp Hinge 8 Damper Release Bar 4 Pickups 9 Harp Mounting Screws on Cue 5 Preamp Jack 10 Typical Tone Bar 1o Name board Mounting Screws Figure 9 6 RHODES Early Design Harp Acfion Assembly Cut Away View TOC 1 2 3 4 5 6 7 8 9 10 l1 file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 ch9 html web devige oy DAJAL Page 3 Wednesday May 24 2000 Chapter Ten Early Design Standards amp Adjustments Page 1 CHAPTER TEN EARLY DESIGN RHODES PIANOS DIMENSIONAL STANDARDS AND ADJUSTMENTS 1 Key Dip Key Dip and Hammer travel are controlled by the height of the Action Rail Key Dip is the term used to describe the downward limit of travel of the Key when depressed 3 8 9 525mm is ideal This is controlled by means of shims Figure 10 1 placed between the Action Rail and the Key Frame To adjust remove the entire Action from the box Along the back of the Key Frame under the Action Rail will be five wood screws Remove these then either remove shims or add shims depending upon whether you wish to reduce or increase the Key Dip ELT DS PELIS En OAMPER CLEARANCE 1 To Loa FOAL AL i in ijel ni 4 HEY OW bi t ejh EARANN yaota al m A e I i a
32. ho plays heavy strong octaves in the Bass area will require even greater Escapement distances in the left hand area Thus you now have the tools to customize the action to the individual tastes and needs of the musician 3 Damper Clearance Although the Bridle Strap is part of the Hammer Assembly it functions as an integral part of the Damper System It is designed to engage a Hook which is formed into the arm of the Damper Module at approximately its mid point As the Hammer swings upward the Bridle Strap pulls the Damper Arm downward thus disengaging the Damper Felt from the Tine As the Hammer Tip strikes the Tine the Damper is at the point of maximum Clearance Figure 4 1 4 allowing the Tine to vibrate unimpeded Damper Clearance should be 3 8 to 1 2 9 525mm to 12 700mm 4 Damper Module Adjustment The Damper Module is subject to easy adjustments With the Hammer in its rest position the Damper Felt Figure 2 3 16 should bear against the Tine sufficiently firm so that the sound will be damped immediately following the Hammer blow Conversely the Damper ideally clears the Tine by at least 3 8 to 1 2 9 525mm to 12 700mm when the Key is depressed To maintain this relationship there are two adjustments possible a Tension Each Damper Arm is actually a Leaf Spring Tension can be increased or decreased by ironing a slight curve in the part with your two fingers Another way is to pull upward or downward on the arm at Point
33. ie P mE mo oS THE i EWE Pa ties ALEE MO Pe l 5 S i all THAME i ki R Ha to Pee ae D be aw oer TEMIR af La EENG 5 L Figure 7 3 RHODES Third Stage Tone Bar Assembly THE TINE In our original design the Tine bottom leg of tbe tuning fork consisted of a length of piano wire 075 1 905mm in diameter Figure 7 4 Fine tuning was accomplished by means of a slideable length of coil Spring which was crimped to produce a friction fit eye iai BPS Serer af i Figure 7 4 RHODES Original Tine Design Later in an attempt to distribute the vibrational shock created by a heavy Hammer blow the wire was tapered Figure 7 5 file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch7 html Wednesday May 24 2000 Chapter Seven Early Design Rhodes Pianos Tone Source Page 2 je Sie i DID 1 7 rimm DH Aim t i ONSE et ae i Figure 7 5 RHODES Second Stage Tine Design This taper was accomplished by the centerless grinding process This new configuration added considerable life expectancy to the Tine As a result of some six years of developmental procedure a major breakthrough was accomplished in the processing of these new tapered Tines Instead of the centerless grinding process we introduced the current Tine Figure 7 6 In this new innovation the Tine is formed by the swaging process a process which by its very nature adds strength to the part by compact
34. ilicon Spray An excess of the Silicon may reduce the Felt s adhesive and cause the Felt to fall off 15 Replace the Action Rail by reversing Action Rail Removal procedure outlined on Page 3 4 After the Piano has been completely reassembled check for Escapement Page 4 1 and determine that a Double Stroking condition does not exist WORN KEY BUSHING REPAIR PROCEDURE After years of normal use the Balance Rail Key Button and Front Pin bushings will show wear causing the Keys to move sideways creating the sensation of a sloppy action By the use of the proper tools and techniques this can be easily cured giving the piano a tight like new feeling The easiest method is achieved by the use of a piano technician s tool called a Key Bushing Tightener Figure 6 7 Figure 6 7 Key Bushing Tightener To use this tool all that is necessary is to remove the Keys and place them on a flat surface Then insert the tool into each affected slot and gently tap the top of the tool with a hammer This will cause the Key wood to be squeezed toward the center making the gap for the guide pin smaller Replace the Keys in the Piano If a Bushing Tightener is not available approximately the same effect can be accomplished with a pair of strong needle nose pliers With the pliers carefully squeeze the wood together at each bushing slot too much force can break the wood causing the bushings to be squeezed inward The third technique is to replace the bu
35. ing the outer surface skin of the Tine iH Psm w ami SE 1 eee J L tae natia Figure 7 6 RHODES Swaged Tine Design In a comparative shock test our first Tine withstood 40 000 heavy Hammer blows the second Tine withstood 1 500 000 blows and the swaged Tine was still going after 6 000 000 blows While it is the nature of even the finest steel to deteriorate when shocked by stresses beyond its elastic limit and thus finally to crystalize and break we feel that in this new process we now have reached the ultimate in providing a part capable of withstanding indefinitely all but the most withering treatment web deiga oy OOM LOE file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 ch7 html Wednesday May 24 2000 Chapter Eight Early Design Rhodes Pianos Action Page 1 CHAPTER EIGHT EARLY DESIGN RHODES PIANOS ACTION Prior to September 1975 Fundamentally there has been no deviation from the original design principle though the actual configuration of the parts has changed THE ACTION The original Hammer Assembly appeared as shown in Figure 8 1 PICK Ur Foku ienesa Tent Tite AAH AE ML MOUNTING IAEA ry DAMPER AF EF TIMUR a mami ii ABST IMG 1 PA E j WLLLASL BEREA os ato oe fa LEVER ate DAMPER rere qe ee lie LEAH GENERATOR ae AABE SCHA SEM an een I i Foil an a aT ATION HAI aw L ee i a inside HEAD r i KET FIOEST AS Figure 8 1 RHODE
36. le Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch9 html Wednesday May 24 2000 Chapter Nine Early Design Rhodes Pianos Maintenance Page 2 Figure 9 3 RHODES Hammer Shim Placement 6 Secure all Neoprene Tips following the instructions given in the Kit 7 The new Bridle Straps are slightly shorter than the old resulting in a lower rest position of the Damper Felts Adjust these upward to suit by bending the Malleable Wire Damper Arm Figure 9 4 DAMPER POT _ ee ht At EAL mIRE f j x A pr BAU SSS G g 2 ll O ee a ARF EN ERIEN Figure 9 4 Early Design Damper 8 Carefully peel off the red woven Felt from the cam curve of the old Hammers exercising care to leave a smooth clean surface and cement to the top of the Key Pedestal This applies whether the Key is as shown in Figure 8 1 or Figure 8 2 2 Suppose you have a Piano of the vintage depicted in Figure 8 4 but with the type Tone Bars as shown in Figure 7 2 and you wish to restore it Proceed as follows a Remove all Felt Hammer Tips with a jack knife Make certain that the maple Hammer Head surface is clean of all Felt and old glue If the Hammer Head is of the variety shown in inset Figure 8 4B remove the back shoulder with a pair of end cutters in order to provide ample surface for the Replacement Neoprene Tips Figure 9 5 HEMGLF Figure 9 5 Double Shoulder Hammer Head b Using 3M Super We
37. long the scale by one or more cents according to a predetermined standard NOTE RHODES Pianos are not stretch tuned at the factory Instead they are tuned to equal temperament The schedule offered here is a carefully determined approximation This schedule is the result of the collective tuning experience of a great number of qualified concert tuners Since this is an approximation deviation from this in qualified hands is certainly allowable However with the tools just described it is also possible to plot with equal precision the exact degree of deviation decided upon The end result then will be that two pianos so tuned will synchronize with such precision as to play together as one To ease your work in following this schedule it is suggested that you mark with a pencil on the Tone Bar Rail the exact place where the basic setting changes and the number of cents change dictated by the chart Figure 5 4 Page 5 6 How to Follow the Chart Typical procedure might be as follows First calibrate your tuning machine in accordance with Manufacturer s instructions making sure that the arrow is set on Zero Next tune A above Middle C Follow with A B C C and D Observing your Chart you will notice that the next tone D is supposed to be tuned 1 Cent sharp So turn the dial on the tuning machine one one hundredth of a Semitone 1 Cent sharp Now continue tuning D E F F and G Again observing your Chart notice that the nex
38. ly Figure 2 1 33 is a short length of wooden dowel capped on each end with felt and held in place by a sleeve built into the back structure of the Piano housing Forced upward by the thrust of the Sustain Rod it in turn pushes upward on the back surface of the Damper Release Bar causing its leading edge to bear downward on all of the Dampers thus disengaging them from the Tines With the Dampers thus released all Tines are now free to vibrate sympathetically with the struck tones as is the case with an acoustic piano The difference becomes apparent when a comparison is made between the resultant sound of a chord where only those Dampers involved with a particular chord are released and then the sound of the same chord when all Dampers are released 1 The Damper Push Rod in its rest position should bear solidly against the back surface of the Damper Release Bar An ideal setting would be that where all play between the Damper Release Bar and the Damper Arms is removed This can be accomplished by adding felt either to the top of the Push Rod or to the mating surface of the Damper Release Bar Extreme care should be exercised to avoid possible disengagement of the Dampers Conversely it can be seen that excessive play or lag in the linkage will result in a loss of touch sensitivity by the foot 2 SUITCASE PIANO ONLY In its rest position the bottom surface of the Push Rod should be reasonably flush with the outer surface of the bottom of the Piano
39. ment This change can be made on any of the older Pianos simply by re routing the bus wires as shown in Figure 10 5 The output impedance then becomes approximately 2500 ohms faisa n a a a eee DO r jj Bia lg im ee f iL 2 RAR ALA 3 x i ARE Figure 10 5 RHODES Bus Wire Re Routing Diagram TOC 1 2 3 4 5 6 7 8 9 10 11 web drig oy PAd OL file Macintosh 20HD Desktop 2 0Folder Fender 20Rhodes 20Manual 20 C4 ch10 html Wednesday May 24 2000 Chapter 11 Diagrams Schematics and Pictorials CHAPTER ELEVEN DIAGRAMS SCHEMATICS AND PICTORIALS Due to the specialized nature of Electric and or Electronic repairs RHODES limits this Chapter to Circuit Board Pictorials Wiring Diagrams and Schematics with the intention of aiding the qualified technician To avoid possible personal injury or damage to the unit all electronic repair and adjustment should be accomplished by a qualified technician 11 1 l CAUTION Schematic Preamplifier Assembly 100 Watt Suitcase and Janus I Printed Circuit Board Preamplifier Assembly 100 Watt Suitcase and Janus I o JPEG Image o Parts List 11 3 Schematic Dual 50 Watt Power Amplifier 100 Watt Suitcase and Janus I 11 4 Schematic Power Amplifier Janus I 11 5 Printed Circuit Board 15 Volt Regulator 100 Watt Suitcase and Janus I Power Amplifier o JPEG Image o Parts List 11 6 Printed Circuit Board 50 Watt Power Amplifier Suitcase Pian
40. mplifier and Power Amplifier Jordan Design Suitcase Piano Pre 1969 11 22 Connection Diagram All Printed Circuit Boards Instructor Console 11 23 Schematic Preamplifier and Power Amplifier Student Piano First Version 1968 11 24 Schematic Preamplifier and Power Amplifier Instructor Piano First Version 1968 11 25 file Macintosh 20HD Desktop 2 0Folder Fender 20Rhodes 2 0 Manual 20 C4 toc html Page 2 Wednesday May 24 2000 Rhodes Service Manual Table of Contents Page 3 11 21 Wiring Diagram Instructor Console 11 26 11 22 Schematic Master Circuit Board Instructor Console 11 27 11 23 Schematic Power Supply Instructor Console 11 28 ACKNOWLEDGEMENT Appreciation is due to all who have been involved in producing this manual Specifically to our Sales Force the Retail and Service dealers and the artists who offered suggestions Last but by no means least to our own highly qualified Product Development Production Service and Marketing personnel whose many hours of labor and years of expertise have produced what we believe to be a comprehensive aid to servicing and understanding the RHODES Piano RHODES Keyboard Instruments U S A FOREWORD Since its inception in 1965 the RHODES Piano has remained relatively constant in terms of design concept However there have been changes in the methods of achieving those design concepts Those concepts which have remained constant throughout the history of the RHODE
41. ne Dimension 10 Scribe a pencil line along the top of each Key Pedestal 1 1 16 26 988mm from the rear surface farthest from the Key Cap Figure 6 4 PENCIL LINE KEY PEDESTAL Figure 6 4 Key Pedestal Pencil Line Dimension 11 One by one remove 5 32 3 969mm felt pieces from the paper backing and place them on the Key Pedestal in front of closest to the Key Cap the scribed pencil line so that the pencil line is visible after the 5 32 3 969mm Felt Piece is securely mounted Figure 6 5 6 32 FELT PIECE VISIBLE PENCIL LINE Figure 6 5 Key Pedestal 5 32 Felt Piece Mounted 12 Remove the 1 13 32 35 719mm Felt Strips from the paper backing one at a time and place them on the top surface of the Key Pedestal with the 5 32 3 969mm Felt Piece mounted Be particularly careful to ensure that the 1 13 32 35 719mm Felt Strip is flush with the front closest to the Key Cap surface of the Key Pedestal Figure 6 6 1 13 32 FELT STRIP EXCESS FELT MAY BE TRIMMED FLUSH WITH BACK OF KEY PEDESTAL Figure 6 6 Key Pedestal Felt Modification Complete file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch6 html Wednesday May 24 2000 Chapter Six Repair Procedures and Techniques Page 4 13 Any excess of the 1 13 32 35 719mm Felt Strip protruding in the rear may be trimmed off however function will not be impaired if it is left untrimmed 14 Lightly spray the Felt Strip with S
42. ning Your RHODES Piano Page 5 1 The Tines in your RHODES Piano like the strings of a guitar are subject to breakage under stress We here at the factory are constantly on the alert for ways to achieve the longest possible life in these as well as in all other component parts of your Piano In actual tests Tines picked at random have withstood in excess of 6 000 000 blows in a test machine This machine is so constructed as to simulate actual playing conditions Despite this steel wire of even the finest quality invariably has flaws along its surface If these microscopically small flaws occur in a node point they can become the point of eventual fracture This is offered to explain the fact that while one person s Piano may play for many years under constant use with no more than a couple or three broken Tines another musician may experience a similar breakage within a shorter period of time For reasons just described the Tines cannot be covered in the general warranty of the Piano In anticipation of this we have devised a simple procedure for replacement one which the musician can perform in about the time it takes to replace a guitar string Refer to Tone Generator Assembly Replacement Procedure Page 6 1 web deiga by badrat file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch1 html Wednesday May 24 2000 Chapter Two The Rhodes Modular Action Page 1 CHAPTER TWO THE RHODES MODULAR ACTION DAMPER REL
43. ns 2 3 RHODES Modular Action Exploded View 2 4 RHODES Harp Action Assembly Exploded View 3 2 RHODES Stage Piano Bottom View 3 3 RHODES Suitcase Piano Top Bottom View 3 4 RHODES Modular Action Single Key Depressed 4 1 Escapement Distances 4 1 Escapement Adjustment Locations 4 2 Adjustment Location 1 4 3 RHODES Damper Arm Tension Adjustment 4 4 RHODES Damper Arm Alignment Adjustment 4 4 RHODES Harp Action Assembly 4 6 Timbre Adjustment Diagram 4 7 Volume Adjustment Diagram 4 7 RHODES Tone Bar Assembly 5 1 Harp Position for Tuning the RHODES 5 2 Typical Dial Electronic Tuning Device 5 4 Stretch Tuning Chart 5 6 Tone Generator Assembly Removal Replacement 6 2 Tine Cutting Measurement Chart 6 3 Felt Strip Cutting Line Dimension 6 5 Key Pedestal Pencil Line Dimension 6 6 Key Pedestal 5 32 Felt Piece Mounted 6 6 Key Pedestal Felt Modification Complete 6 7 Key Bushing Tightener 6 8 Key Identification Chart 6 10 RHODES First Stage Tone Bar Assembly 7 1 RHODES Second Stage Tone Bar Assembly 7 2 RHODES Third Stage Tone Bar Assembly 7 2 RHODES Original Tine Design 7 2 RHODES Second Stage Tine Design 7 3 RHODES Swaged Tine Design 7 3 RHODES Original Action Design 8 1 RHODES Second Stage Action Design 8 1 RHODES Third Stage Action Design 8 2 RHODES Fourth Stage Action Design 8 2 Tear Drop Hammer Head Groove Removal 9 1 Tear Drop Hammer Head Reshaping to Striking Line 9 1 RHODES Hammer Shim Placement 9 3 Early Design Damp
44. o o JPEG Image o Parts List 11 7 Printed Circuit Board 50 Watt Power Amplifier Janus I o JPEG Image o Parts List 11 8 Schematic Preamplifier 80 Watt Suitcase and Super Satellite 11 9 Schematic Power Module 80 Watt Suitcase 11 10 Schematic Power Supply Regulator Assembly Peterson Design 80 Watt Suitcase 11 11 Circuit Board Assembly Power Supply Regulator Peterson Design 80 Watt Suitcase 11 12 Schematic Power Amplifier Master and Slave Super Satellite 11 13 Schematic Power Control Panel Master Super Satellite 11 14 Schematic Power Control Panel Slave Super Satellite 11 15 Schematic Converter Kit I 11 16 Schematic Converter Kit II 11 17 Schematic Preamplifier and Power Amplifier Jordan Design Suitcase Piano Pre 1969 11 18 Connection Diagram All Printed Circuit Boards Instructor Console 11 19 Schematic Preamplifier and Power Amplifier Student Piano First Version 1968 11 20 Schematic Preamplifier and Power Amplifier Instructor Piano First Version 1968 11 21 Wiring Diagram Instructor Console 11 22 Schematic Master Circuit Board Instructor Console 11 23 Schematic Power Supply Instructor Console TOC 1 2 3 4 5 6 7 8 9 10 11 file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 20Manual 20 C4 ch11 html usb deiga by COOOL Page 1
45. ovement until finally when your adjustment is correct the wheel will stop indicating that the Bar is in tune The various electronic devices have another feature some are more sophisticated than others It is a deliberate and controllable means of calibrating the entire mechanism with reference to the 60 cycle signal coming from the electrical outlet With calibration thus achieved and with the control dial set at Zero the machine supposedly is now set at A440 This is a standard arbitrarily determined as an international standard and means merely that A above Middle C will vibrate at precisely 440 vibrations per second Because of such a standard it is possible to tune an instrument in California with reasonable assurance that it will be in tune with a piano in New York Or that 24 pianos delivered to a school as a lab will all arrive tuned alike Certain musicians will demand a more sensitive tuning than what would be the result if the tuning machine were set at A440 for the duration of the entire tuning procedure This brings up a term known as Stretch Tuning STRETCH TUNING Stretch tuning is a procedure widely followed by the piano tuning profession It recognizes a phenomenon of the human ear whereby tones in the upper range of a keyboard will sound flat even though they are calibrated with extreme precision Fortunately for all a consensus has long since been agreed upon as to the exact amount of stretching A piano so tuned creates
46. oving the four Mounting Screws as well as the two Screws which secure the Harp Pivot Links 4 Damper Release Bar Removal The Damper Release Bar Figure 2 3 12 is secured to the aluminum Harp Supports by two removable Pivot Pins Figure 2 3 11 a Loosen one Screw Figure 2 3 13 on either end of the Damper Release Bar b With a small flat blade screwdriver slide the Pivot Pin out from the Damper Release Bar through the Nylon Bushing Figure 2 3 10 in the Harp Support Figure 2 3 9 c Slide the entire Damper Release Bar loose from the Bushing in the other Harp Support Removal of the Damper Release Bar is required in order to reach the Damper Modules for adjustment or removal a ee E 11m IE a A T i Fiend Gin j aid hihi apii Thi ikr wll Figure 3 1 RHODES Harp Action Assembly Exploded View 5 Damper Module Removal a Remove Damper Module Mounting Screws b Carefully push down on each Damper Arm with one hand and gently pull Bridle Strap forward with the other hand so as to slide Bridle Strap away from the formed tongue in the Damper Arm without causing damage to the tongue c Pull Damper Module out of detent lip in Action Rail 6 Hammer Removal It is not necessary to unscrew or displace any of the supporting structures to remove a Hammer Hold the Hammer Head with the thumb and index finger then rotate either left or right while at the same time twisting on the vertical axis until the protruding ear pin pop
47. pers for maximum performance c An alternate method of accomplishing the same thing is to remove all Hammer Tips add a Shim then replace the Tips as outlined on Pages 9 2 and 9 3 This procedure while perhaps a bit more tedious requires no equipment nor re adjustment of Dampers As also is the case in string pianos the Escapement distance in the Bass section should be greater than in the middle and upper sections This requirement is even more pronounced in our Instrument due to the wide arc of Tine movement encountered Escapement distance on Tone Bar 1 could be 3 8 9 525mm Insufficient Escapement in this area invites double stroking with an accompanying disturbing sound Signal Strength Originally the 73 Pickup Coils were joined in a series parallel arrangement as shown in Figure 10 3 a E i i e E 7 Ea F Eil a 4 z b z i E mid a E E EEFE T Se ee Shame SSS E E TS SEE RS ERECT PPE EEE EDP ER rhe eh bet bEGES REIMER aS FEELERREDT EFES FSSA eE a F i TIS d S a 4 13 2 Iz ER ia F Figure 10 3 RHODES Original Pickup Coil Series Parallel Arrangement Later basic voltage output was quadrupled by changing the series parallel arrangement as shown in Figure 10 4 MS AES a Mesterei theres eee ress Hee eee ak nilaan an EXERES SEPREEALAPESEETER ESS FEDap ites etl ece tele eee Pee PRESS PEPE EG EC eee m w j Ti i Im r r nf fi Fa a a at ben an Figure 10 4 RHODES Modified Pickup Coil Series Parallel Arrange
48. s left Tone Bar At the extreme Treble right Tone Bar this dimension is approximately 1 8 3 175mm RE ESTABLISHING STRIKING LINE 1 Remove the Harp Keybed Assembly from the Cabinet following procedures outlined in Chapter Three 2 To re establish proper Striking Line remove two 2 Harp Mounting Screws Figure 4 7 on the Bass left side of the Harp and one 1 Harp Mounting Screw on the Treble right side of the Harp located closest to the Keys Loosen but do not remove the remaining Screw In addition remove one 1 Harp Pivot Link Mounting Screw on the Bass left side of the Harp which attaches the Harp Pivot Link to the thread grooved slot formed in the side of the Harp Support ERFT be Te f eu Bold T a e REAT ee ate L 5 ne _ Teno FE i ee m i m rin ao ET a al ae iii i T r z Pi a tr ee yy Fjer 4 or E RSS Figure 4 7 RHODES Harp Action Assembl 3 While striking Middle C slide the Bass left side of the Harp forward and back until ultimate tone clarity and volume response is achieved Move on to F below Middle C then to C below Middle C following the same procedure Because of the precise curve of the Harp when these three notes satkfy your ear all others will be within tolerable limits 4 When the new Harp location has been established use extra holes provided or sink new holes through the steel Harp Frame and through the top surface of the aluminum Harp Supports using a 7
49. s around the Key to hold the Cap firmly in place until the glue dries ONE AND TWO PIECE TYPE KEY CAP Basically replacing the One piece Figure 6 8 A and the Two piece Figure 6 8 B type Key Caps is the same as replacing the Full skirt type Cap However the technique does vary slightly in the removal and clamping processes since the One and Two piece Caps cover only the top and front of the Key file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 ch6 html Wednesday May 24 2000 Chapter Six Repair Procedures and Techniques Page 5 A OME PIECE REY CARE PRATT READ Pa TUT TERTE S Pri bu Tce yfaguete HAMe A OTH Fi RADIE Fi ral PEGS TAL TT i i d Fong ED ELT MUIL Ha PRATT PEAD i J WO BOLD WARE POLICE AREA PRAI P j ITE CH MC TAAL Y DWL Pace phat linc miaa SAD ALL TWOPIDOE AMO PULLS abouts PRATT MEAD WURRITELA Ma PLA OCMC Py BT Foy ATLA PE ite EA aE Pepa SoN PE GFAT AL i bapi o MPD NARR GL AALE TALITTEN ASD A Fae BS H TOF IDOE AND PULL SAINT EEY CAFI GRE RES TAL FA TIP TiN PRATT ALAD WAS THE ONLY VERCEN F DR Tiere AND FULL XINT CAFS WTH MAURELL P PURA i OTE On TAI FIECE CAPS Toe PLCE fs Tecan THAN FRONT PIO rr l S F ELT i l l IRTEE HA STAC TELT GN BODIFIED WHITE PRATT READ LULL GREAT MATURAL PEDESTAL REY PEDERTAL ILT i FELT gii MODIFIED HEMMER Err COGS AL Harr SHE CPS eM aa PRATT BEAD Tei CE Hin CAFS PRATT A
50. s out of the Hammer Flange Then simply lift out exercising care to ease the Bridle Strap off the Damper Arm Tongue 7 Removal of Keyboard Assembly from Cabinet CAUTION This procedure should be accomplished with the Nameboard Assembly mounted to prevent the Keys from falling out 7 i las F L j i ci i it Fea d T file Macintosh 20HD Desktop 20Folder Fender 2 0Rhodes 20Manual 20 C4 ch3 html Wednesday May 24 2000 Chapter Three Instructions for Disassembly Stage Piano Figure 3 2 RHODES Stage Piano Bottom View a Position the Piano so that the Keys are pointing up with the bottom surface of the Cabinet facing you Figure 3 2 b Using a 2 Phillips Screwdriver remove the two Screws igure 3 2 1 which secure the Cabinet to the Cheekblock cleat on the Keybed CAUTION Before proceeding with Step b support the Keybed with one hand to prevent the Keybed from falling out when the Mounting Screws are removed c Remove the two large Screws Figure 3 2 2 which mount the Keybed to the Cabinet d Place Piano on its bottom surface and remove Keyboard Assembly by lifting out of Cabinet Suitcase Piano e Proceed as with a Stage Piano again observing the CAUTION on the previous page following Steps a b and c In addition since the bottom surface on the Suitcase Piano is of a thinner plywood than the Stage Piano the four Glides Figure 3 3 1 must be removed as well Proceed with Step d Figure 3 3
51. shings With a sharp knife carefully trim away the worn bushings Then apply a white glue to each side of the bushing slot Install new felt obtainable from any piano supply house and clamp the felt in place with a key bushing wedge or clamp The Bushing Tightener can be used for this purpose also After the glue has dried trim away the excess felt and replace the Keys in the Piano An alternative to the felt bushing is plastic bushing inserts Instead of installing felt after the glue is applied press in the plastic inserts After the glue dries replace Keys in Piano After any bushing tightening or replacement always make sure the bushings are not too tight and that the Keys do not stick KEY CAP REPLACEMENT PROCEDURE Periodically a customer will request a new Key because some blow has caused a fracture or a cigarette burned one or more of the Key Caps Instead of replacing a Key it is a standard practice of piano technicians to resurface or recap the Key To resurface a Key it is first necessary to identify the Key and its Cap style Refer to Key Identification Chart Figure 6 8 Page 6 10 Once the Key Name manufacturing type Cap thickness and Cap style have been determined you can then proceed with removing the damaged Cap The same type of white key cement can be used for the One piece Two piece or Full skirt style Cap Because the surface of the Key where the Cap adheres to the wood is visible a glue that dries white is pref
52. stments Page 2 Figure 4 3 Escapement Adjustment Locations a Each of the Tone Bar Assemblies is separated from the Tone Bar Rail by two adjustable coil Springs By means of these the height of each Tone Bar Assembly can be raised to 1 2 12 700mm or lowered to 3 16 4 762mm factory setting is 3 8 9 525mm From Figure 4 4 it can be observed that this adjustment increases or decreases the Escapement Distance INCREASED FACTORY REDUCED ESCAPEMENT i eS ESCAPEMENT oe h a fah iah ij JOT ie a f Z E E Na t ia e A jE E n A s a Figure 4 4 Adjustment Location 1 NOTE Any major change of adjustment by this means requires re alignment of Timbre Volume and Damper Settings b Adding or subtracting shims from the Harp Supports Figure 4 3 2 should be resorted to ONLY for the purpose of establishing Escapement at the extreme Bass left Tone Bar 1 4 minimum to 3 8 maximum 6 350mm minimum to 9 525mm maximum and the extreme Treble right Tone Bar 1 32 minimum to 3 32 maximum 0 794mm minimum to 2 381mm maximum Having been introduced to the adjustments available to you in achieving the best Escapement settings for optimum touch response you should strive to tailor the Escapement settings in accordance with the particular style of play employed by the person who plays the Instrument A sensitive musician will be looking for extremely close settings in the Mid and Upper range A musician w
53. t tone G is supposed to be tuned 2 Cents sharp So again re set the dial on your tuning device This time set the dial two Cents sharp Continue this procedure until you reach the highest note on the Piano Now go back to your starting point at A above Middle C Move the dial back again to Zero Observe G to the left of A The Chart shows this to be 1 Cent flat Therefore following the procedure which by now is familiar to you turn the dial to the left of Zero a distance of 1 Cent and tune G Continue downward tuning G F F and E The next note D is one and one half Cents flat D C4 C B A and G are all two Cents flat etc Continue observing the schedule shown on the Chart until you reach the lowest note on the Piano Upon completion of this you will have Stretch Tuned the Piano in accordance with the best tuning tradition Now treat yourself to a performance and enjoy the rare brilliance that only Stretch Tuning can achieve Should you ever wish to revert to standard equal temperament tuning simply set your dial to Zero and leave it there as you proceed throughout the entire Keyboard This may be necessary where you feel the need to synchronize with an organ for instance where it is impossible to Stretch Tune It should be noted also that with all instruments where any option can be realized the musician will automatically follow the concept of Stretch Tuning This may explain why an instrument tuned to equal temperament ma
54. the One piece Cap the front should be firm against the front of the Key and the Cap should be centered so that there is equal overhang on both sides of the Key After the Cap is properly aligned clamp the Cap in place with spring clamps and a block or plate to keep the clamps from scratching the plastic Cap After the clamps and blocks are in place make sure the Caps are still properly aligned and realign if necessary Set the Key aside and allow appropriate time to dry which will depend on the glue used After the glue has dried remove the clamps and blocks and trim down the excess overhang on the sides of the Key with a flat file a Vixen type file does a very quick and neat job File away the excess plastic until the Cap is flush with the sides of the Key For a nice smooth appearance scrape with an X acto type knife or sand away file marks in the plastic and round off the front corners of the head of the Cap The Key is now ready to be replaced in the Piano 1 Heating the plastic Cap with a heat gun will soften the plastic to allow easier removal 2 Spring clamps and plates for the tops and fronts are available from piano supply companies web design by badrat file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 2 0 Manual 20 C4 ch6 html Wednesday May 24 2000 Chapter Seven Early Design Rhodes Pianos Tone Source Page 1 CHAPTER SEVEN EARLY DESIGN RHODES PIANOS TONE SOURCE Prior to July 1975 In the broad claim
55. the impression of great tonal brilliance Preliminary to a description of stretch tuning a bit more basic information is in order For the purpose of standardization the word semitone is used to describe the difference in pitch between any tone and the tone 1 2 step above One one hundredth part of a semitone is called a cent Thus to raise a certain tone one cent is to raise it from its original A440 setting by one one hundredth of a semitone All electronic tuning devices make use of this standard and have a dial by which the technician can deliberately change the basic setting of a given tone by as many cents above or below a given optimum as he chooses merely by altering the setting on the dial of his tuning device Figure 5 3 file Macintosh 20HD Desktop 2 0Folder Fender 2 0 Rhodes 20Manual 20 C4 ch5 html Wednesday May 24 2000 Chapter Five Tuning the Rhodes Piano Page 2 we OF A SEMITO p 10 wlan 4G Wityp My My Se fe 10 ii IRRA Mg t i ei esters ww T Hay Figure 5 3 Typical Dial Electronic Tuning Device Armed with this standard it now becomes possible for the technician to plot with precision the exact degree of stretch and to achieve exact synchronization of tuning between two instruments even though one may be tuned in New York and the other in California Stretch Tuning as described here means the deliberate and precise raising or lowering in pitch of a given range of tones a
56. ugh Escapement variation the Neoprene Hammer Tips are graduated in height as well as hardness from extreme Bass through extreme Treble There are presently five gradation of hardness in the Hammer Tips and therefore corresponding height differences They are Hammer Tip Number Durometer Reading Height Hardness 1 through 30 30 1 4 6 350mm 31 through 40 50 5 16 7 938mm 41 through 50 70 3 8 9 925mm 51 through 64 90 7 16 11 112mm 65 through 88 Wrapped extra hard 7 16 11 112mm As is apparent from the above chart there is a 1 16 1 588mm height increase from one Hammer Tip section to the next except in the extreme Treble area or 3 16 4 762mm overall Hammer Tip height increase from Bass to Treble left to right The precise change points of the Hammer Tips are subject to individual taste While the factory settings are listed above some musicians prefer to continue the Tips of the 90 durometer clear up to Hammer Number 67 or beyond This is done to avoid the sharp change in tone characteristics experienced as a result of the difference in Tip hardness This provides further opportunity for customizing in accordance with individual taste A quick glance at Figure 4 3 will reveal that there are two ways of achieving a fine custom adjustment of the Escapement Distances file Macintosh 20HD Desktop 20Folder Fender 2 0Rhodes 20Manual 20 C4 ch4 html Wednesday May 24 2000 Chapter Four Dimensional Standards and Adju
57. wo parts when joined together become the Tone Generator Assembly The Kit then is known as the Tone Generator Assembly Replacement Kit NOTE Originally RHODES manufactured only a Seventy three Key Model Piano and Tone Generator Assemblies were identified on the Tone Bar as Number 1 through 73 In actuality our Seventy three Keys are E8 through E80 as compared to an Eighty eight Key Piano whose keys are identified Al through C88 When manufacture of our Eighty eight Key Pianos was begun our problem of identifying the seven notes preceding our Number 1 E8 was solved by designating all seven as Num ber 0 since the Tone Bars were identical Since we have determined that conformity to the industry standard would be less confusing Therefore Tone Bar Assemblies which include Tone Generator Assemblies will be identified on our Eighty eight Key Pianos as 1 through 88 and on our Seventy three Key Pianos as 8 through 80 To perform the replacement procedure you will need the following tools 1 A Phillips Screw Driver No 2 2 A pair of Side Cutters 3 A 1 4 6 350mm and a 5 16 7 938mm Wrench Complete replacement requires only the following simple steps 1 Remove the Harp Cover 2 Remove the Tone Generator Mounting Screw Figure 6 1 using the 5 16 7 938mm wrench TONE GENERATOR MOUNTING SCREW TONE BAR Figure 6 1 Tone Generator Removal Replacement 3 Remove the four Screws which secure the
58. y sound dull and flat STRETCH TUNING CHART Serer ee Apii SEEDED PELE p Hi E Ese peep doen ye o SS IE peo eere eein i he en A ets Sept ocaeca EE ea Pe H a eek a AEA aGesee neues HESE o E ememr ceseco eass cesia Sara SSSSSF2H I I Ee E ass pesee aE TEETE EENES E EE ERE E ET ESERESESEE SP Err ray SPP ay Samm ErSs SSs SPepopiredpe de a Se a re Sauces otee teei CELE Se el a n SRE EH SS ee ee eee l aa ar HE Poereeree aiii st geste SEER EGSEEEE TERIOR H H SEneeresssss ki ae ese oe SSS 2 a SS Se ae ee ee eh on he E E E TILT TOII LLL Pea is iil incl bili Cent O UP 2 Cents Ka DOWN 1 Cent Figure 5 4 Stretch Tuning Chart file Macintosh 20HD Desktop 20Folder Fender 20Rhodes 2 0 Manual 20 C4 ch5 html Wednesday May 24 2000 Chapter Six Repair Procedures and Techniques CHAPTER SIX REPAIR PROCEDURES AND TECHNIQUES TONE GENERATOR ASSEMBLY REPLACEMENT PROCEDURE Since all Tines throughout the pitch range are of the same configuration and vary only in length and since the Tines can easily be cut to size by means of a pair of side cutter pliers it follows that all the musician needs is a set of replacement Tines To aid the musician replacement Tines are packaged in Kits of six In each Kit is an assortment of Tuning Springs and a complete cutting chart Each of the six Tines comes already pressed into the little cross piece called the Tone Generator Thus the t

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