F:\Daten zum sortieren\Ensoniq Mirage Service Manual\Ensoniq
Contents
1. No sound from drive on power up Press one key more than one note sounds Transformer Power Supply Disk Drive Diskette Main Board Power Supply Disk Drive Diskette Main Board Fuse Power Supply Transformer Main Board Power Switch Line Filter Power Supply Transformer Line Filter Power Switch Fuse Holder Transformer Diskette Disk Drive Main Board Power Supply Disk Drive Disk Drive Keyboard Buzzing noise instead of sound Velocity Sensitivity Problems Bad display segments Individual button inoperative Volume control inoperative Pitch or mod wheels inoperative Non transformer noise on output one voice or all voices Footswitch inoperative MIDI problems Sampling function inoperative Unit won t recognize disk Sync Jack inoperative Keyboard Main Board Keypad Keypad Cable Main Board Keypad Keypad Cable Main Board Wheel Module Main Board Main Board Main Board Main Board Main Board Disk Drive Main Board Main Board Replacing The Power Supply 1 Remove all cables connected to the Mirage including the power cable 2 Remove the five screws which fasten the Mirage control panel and raise the panel 3 Disconnect the wiring harness from the power supply Note that the cables have connector locks 4 The power supply is held in place with two screws and nylon shoulder washers through the back panel and with four snap in standoffs through2. the steps involved in the replacement of the particular module TROUBLESHOOTING THE MIRAGE Most problems with the Mirage will be fairly easy to diagnose with a few exceptions What may appear to be disk drive or display problems are often problems with the power supply or with a defective diskette For this reason we recommend that you always load a diskette that you know is good and check the power supply before troubleshooting the rest of the unit TO CHECK THE POWER SUPPLY First plug the Mirage in and turn it on Then remove the five screws securing the control panel and raise the panel Check to make sure that all the connections are secure and correct When the Mirage has warmed up for five minutes begin to test the voltages at the points shown in Figure 2 and Figure 3A 3B If the voltages vary outside the allowable limits replace the power supply and test the unit before proceeding with further diagnosis TRANSFORMER AND POWER SUPPLY VOLTAGE CHECK POINTS The following charts show the connector terminal number and correct voltage values for the power supply and transformer POWER SUPPLY VOLTAGE MEASUREMENTS MEASURE BETWEEN VOLTAGE VALUE TERMINAL N0 S REAR OF UNIT t t2 MM 3 4 5VDC 5 5 6 50mv AC ripple max 5 7 Q TO HARNESS 6 8 7 8 1 2 m 12VDC 10 1 3 G POWER SUPPLY BOARD 100mv AC ripple max 5 9 3 8 9 TO HARNESS TO TRANSFORMER I2VDC 10 5 10 100mv AC
3. 25 amp 26 ARE NOT USED PIN 1 NOTE PINS 25 amp 26 ARE NOT USED SECTION Replacing Individual Keys amp Cleaning The Velocity Switches Problems with velocity sensitivity are usually caused by dirt in the velocity sensitivity switching circuit The circuit and switchpads are located underneath the keys and you will have to remove the keys individually to perform the service The flexible switchpads are installed in five sections The first four sections contain 24 pads 12 keys while the section on the far right end of the keyboard contains 26 pads 13 keys In order to properly clean the switchpads an entire section must be removed White keys must be removed before black keys can be removed 1 Remove all cables connected to the Mirage induding the power cable 2 Remove the five screws which fasten the Mirage control panel and raise the panel 3 To remove an individual key pull forward on the key spring and lift the back of the key straight up Then pull the key forward and out You will now see two of the gray rubber switchpads under the key 4 Repeat this procedure until an entire switchpad segment is exposed Remove the segment by popping it off the circuit board 5 Clean the switchpad segment and circuit board thoroughly with an electrical contact cleaner isopropyl alcohol is safe 6 Pop the switchpad into the circuit board Install the keys by sliding each key into place making sure it fits onto the locating peg P
4. ITY LINE TO DISK DRIVE SECTION Replacing The Pitch and Modulation Wheels The pitch and modulation wheels are replaced together along with the pitch and mod wheel panel and wiring harness Special care should be given to properly aligning the sheet metal with the front of the Mirage cabinet 1 Unplug all cords from the unit and remove the five screws fastening the control panel Lift the panel from the front 2 Tilt the Mirage up on its back to expose the four wheel module screws on the bottom Remove the screws while supporting the wheel module with your free hand 3 The wiring harness is hard wired into the wheel module Unplug the harness from all four connections and cut the two wire ties to release the harness IMPORTANT 4 To reassemble first install the new wheel module with the four screws noting that the screw holes in the cabinet are oversized Carefully align the module so that it fits flush against the end cap and lines up with cabinet on the front If this module is not aligned properly it will interfere with the operation of the keyboard or pitch and modulation wheels 5 Reconnect the wiring harness and install new wire ties 6 Close the front panel and test the unit Replacing The Line Filter 1 Remove all cables from the Mirage induding the power cable Check the power cable for continuity 2 Remove the five screws which fasten the Mirage control panel and raise the panel 3 Remove the two AC conn
5. ase film from the adhesive pad 5 Before installing the new circuit board make sure that the board insulator is in place on the bottom of the case insert the non adhesive standoffs on either side of the expansion port connector and place the lockwashers on the jacks 6 With the circuit board tilted slightly to the rear insert the jacks into the holes in the rear panel and snap the board onto the three front standoffs Secure the jacks with nuts 7 Carefully reconnect the disk drive keypad and harness cables 8 Install the keyboard according to the instructions in SECTION G 5 9 with this exception Since the cable should already be attached to the keyboard make sure that it is not pinched by the mounting rails and connect it to location J 3 on the main circuit board Take care that the two unused terminals of the cable connector face the rear of the unit 9 Close the control panel and test the unit Replacing The Wiring Harness WHEEL MODULE BOTTOM VIEW FRONT 1 1 Remove all cables connected to the Mirage including the power cable 2 Remove the five screws which fasten the Mirage control panel and raise the panel 3 The wiring harness is hard wired into the wheel module Unplug the harness from all four connections and cut the two wire ties to release the harness 4 Tilt the Mirage up on its back to expose the suue four wheel module screws on the bottom GREEN Remove the screws while supporting the wheel VIOLET mo
6. dule with your free hand 5 Unsolder the connections at the wheel module and note the location 6 Solder the new harness to the wheel module Refer to Figure 6 for the proper configuration Reconnect the harness and install new wire ties 7 Follow the instructions for the installation of the wheel module SECTION E 4 8 Close the control panel and test the unit HARNESS FIGURE 6 WHEEL MODULE CONNECTIONS 263 Great Valley Parkway Malvern Pennsylvania 19355 Parts Ordering 1 800 441 1003
7. ectors from the filter noting the polarity 4 Remove the two screws and nuts which secure the filter to the case Note that there are lockwashers on both the inside and outside 5 Install the new line filter from inside the case and reconnect the two AC connectors noting the polarity Note on some Mirage units the line filter must be mounted from the outside of the case 6 Close the control panel and test the unit SECTION Replacing The Keyboard The Mirage keyboard is mounted in the case using nine mounting screws through the case into two special mounting rails on the underside of the keyboard Since there are no pre drilled mounting screw locations in these rails it is important for you to make sure that the keyboard is aligned properly before final installation Failure to do so may result in faulty keyboard performance 1 Remove all cables connected to the Mirage induding the power cable 2 Remove the five screws which fasten the Mirage control panel and raise the panel 3 Tilt the Mirage up on its back to expose the nine keyboard mounting screws on the bottom of the unit Supporting the keyboard with one hand carefully remove the mounting screws 4 Slowly lift the keyboard from the disk drive end until the keyboard connector on the underside of the keyboard can be seen Carefully remove the connector noting that the two blank terminals of the connector face the center of the keyboard IMPORTANT _ 5 To install the new
8. keyboard lay the right side of the keyboard into the case and carefully plug the connector into the keyboard Note that the keyboard cable is pre formed into several bends Goan OR Refer to Figure 5 to make sure the cable is properly routed Then ON MAIN lower the left side of the keyboard into the case making sure that the flat cable is not in danger of being pinched by the keyboard mounting rails IMPORTANT 6 Since the Mirage keyboard uses mounting rails it is important to align the keyboard properly before installing any of the mounting screws The keyboard should be positioned so that there is equal clearance between the end key and case on both ends of the keyboard It may be helpful to use thin cardboard shims to help maintain this clearance during installation 7 Once the keyboard is aligned tilt the Mirage up on its back while supporting the keyboard with one hand Insert the first mounting screw in the center front mounting hole and visually locate the screw into the mounting rail channel Fasten the screw but do not secure it IMPORTANT 8 Recheck the alignment and install the remaining mounting screws occasionally rechecking the keyboard alignment Remove any shims To avoid placing any warping stresses on the keyboard or case tighten the screws from the center of the keyboard outwards 9 Test the operation of the keys particularly the end keys Close FIGURE 5 KEYBOARD CABLE the panel and test the unit ie NOTE PINS
9. lace the rear of the key over the spring Pull the key slightly forward while pressing down at the rear The spring should be locked in place at the rear of the key 7 After all keys are replaced close the front panel and test the unit SECTION IMPORTANT SECTION Replacing The Main Circuit Board When replacing the main circuit board of the Mirage keep in mind that it is the most expensive module in the unit and is quite fragile and static sensitive The circuit board is held in place by the audio in and out footswitch and sync jacks in the rear panel and by three snap in standoffs in the front of the board 1 Follow the instructions for the removal of the keyboard SECTION G 1 4 with one exception Instead of removing the keyboard cable from the keyboard disconnect the J 3 connector from the main circuit board 2 With the keyboard removed disconnect the disk drive cable keypad cable and two harness connectors from the main circuit board 3 Unfasten the four nuts from the audio in and out footswitch and sync jacks 4 Pop the circuit board off the three standoffs on the front of the board Lift the front of the board and remove it from the unit Note that there are lockwashers between the jacks and the rear panel and that the two standoffs on either side of the expansion port connector are not secured to the case Remove these standoffs from the board and save them to install the new board but DO NOT remove the rele
10. lacing The Disk Drive The disk drive is held in place with four screws through the bottom of the cabinet To avoid damage to the drive components always remove the drive unit from front of the panel 1 Unplug all cords from the unit and remove the five screws which fasten the control panel and raise the panel 2 Disconnect the cables from the drive unit noting the polarity This is important because in some earlier units the disk drive cables were crimped wrong and the red line is not Pin 1 but Pin 34 3 Tilt the Mirage up onto its back to expose the four disk drive fastening screws Remove the screws while supporting the drive unit with your free hand IMPORTANT 4 Carefully guide the disk drive out through the front panel taking care not to damage the plastic face plate or exposed components Do not handle the drive unnecessarily We suggest that you place it immediately in an anti static bag or appropriate box 5 To reassemble carefully guide the new drive in through the front panel again giving special care to the face plate and exposed components 6 Tilt the Mirage up on its back while supporting the drive with one hand Fasten the drive with the four screws and lockwashers iai 7 Reconnect the cables Note that the ribbon cable has CONNECTOR pre formed bends Refer to Figure 4 to make sure that FIGURE 4 DISK DRIVE CABLE BOARD the cable is properly routed in the case 8 Close the control panel and test the unit RED POLAR
11. original source unknown cleaned pdf by www deepsonic ch 27 12 2011 TO J2 CONNECTOR QN MAIN BOARD D WHEEL MODULE TO J1 CONNECTOR ON MAIN BOARD Que s DISK DRIVE HARNESS E us FUSE HOLDER F LINE FILTER a KEYBOARD Y _ LI S gres rariica NVAHBTAXEWYZ S SS CA LL L I i D id m a DIGITAL SAMPLING KEYBOARD TO KEYPAD 3 i j N xa 1 m H ap i xt A 10 DISK DRIVE 3 gy VOLUME KNOB FUSE HOLDER LINE FILTER POWER SWITCH TO KEYBOARD VELOCITY SWITCHES FIGURE 1 MIRAGE EXPLODED VIEW e NOTE The location of some components may vary from early to later production models of tbe Mirage However the replacement procedure will remain the same Servicing the Mirage is quite simple and straightforward Rather than diagnose and replace individual components you will replace complete modules The Ensoniq Module Exchange Program is available to all Authorized Repair Stations and will be the most cost and time efficient method for both you and your customer At Ensoniq we are equipped with sophisticated machinery to diagnose module faults quickly and accurately The exchange program will help you to make reliable repairs to your customers instruments with a minimum of downtime and expense The troubleshooting chart will cover just about any occurrence and will tell you which module should be replaced Refer to the appropriate section for
12. plug the connector noting its orientation 5 To reassemble first make sure that all the buttons are in place and then cover them with the insulator Make sure that the display and lens are clean 6 Connect the cable to the keypad circuit board making sure that the cable is not twisted or pinched and install the board using the six screws and lockwashers 7 Close the control panel replace the volume knob and test the unit SECTION Replacing The Transformer At the factory the Mirage transformer is rivetted into place Replacing the transformer will require drilling out the four rivets and installing the replacement transformer with the screws and nuts provided 1 Unplug all cords from the unit including the power cord and remove the five screws which fasten the control panel and raise the panel 2 Disconnect the transformer cables from the power supply fuse and line filter noting the polarity 3 Tilt the unit up on its back to expose the four rivet heads on the bottom of the case IMPORTANT 4 Tape or otherwise support the transformer from the inside to prevent it from dropping when the last rivet is drilled Using a 3 16 drill carefully drill the four rivets until the heads fall off 5 Install the new transformer using the four screws and nuts supplied making sure to use the lock washers on the inside Fasten securely 6 Connect the transformer cables 7 Close the control panel and test the unit SECTION Rep
13. ripple max 8 10 7 5VAC 11 13 12 13 12VAC 14 15 14 16 AC LINE VOLTAGE MEASUREMENTS REAR OF UNIT f With the power switch OFF 120VAC should measure from lA 2A 2A 2B 3A 3B FIGURE 2 POWER SUPPLY VOLTAGE CHECK POINTS TRANSFORMER With the power switch ON 120VAC should measure from 1A 2B 1B 2B 2B 3A 2B 3B There should be no voltage across the power switch contacts 3A 3B WIRE WITH LARGE CONNECTOR FIGURE 3A AC LINE VOLTAGE CHECK POINTS WIRING FOR EARLY MODEL CASE WHERE TRANSFORMER IS ON THE LEFT REAR OF UNIT 1 SWITCH AC LINE VOLTAGE MEASUREMENTS With the power switch OFF 120VAC should measure from LINE TOP LUG FILTER 1A 2B 2A 2B 3A 3B TRANSFORMER With the power switch ON 120VAC should measure from lA 2B 2B 3A 1B 2B 2B 3B There should be no voltage across the FIGURE 38 AC LINE VOLTAGE CHECK POINTS power switch contacts GA j 3B WIRING FOR LATE MODEL CASE WHERE TRANSFORMER IS ON THE FAR RIGHT MIRAGE TROUBLESHOOTING CHART PROBLEM Dead keys FAULTY MODULE SECTION Keyboard G Power Suppl PPY Main Board I Incorrect voltage levels Diskettes won t load ud unformatted disk shows in display nd no disk does not show in display when unit is turned on Blows Fuses Buzz or hum in audio output dE disk error shown in display Drive light on or off continuously
14. the circuit board Remove the screws and shoulder washers from the back panel and unsnap the circuit board from the standoffs by pulling straight up IMPORTANT _ 5 To replace the power supply first make sure that the insulator pad is in place then snap the new unit onto the standoffs making sure that they are fully seated Fasten the unit with the two screws and shoulder washers through the rear panel making sure the screws pass through the holes in the heat sink insulator Carefully re connect the wiring harness paying particular attention to the proper alignment of the pins and connectors 6 Close the control panel and test the unit SECTION Control Button or Keypad Replacement Keypad and display related problems will require the replacement of the keypad circuit board Individual buttons may be replaced When disassembling the keypad note that the buttons are held in place and separated from the keypad circuit board by an insulation panel 1 Remove all cables connected to the Mirage including the power cable 2 Remove the volume knob and the five screws which fasten the control panel and raise the panel IMPORTANT 3 The individual buttons are held in place only by the keypad circuit board To prevent them from falling out when the board is removed open the control panel all the way and tilt the unit back by placing a 3 block under the front edge 4 Remove the six screws and lockwashers holding the keypad circuit board Un
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