Reading Recommendations

The following books are recommended for additional information on micropeocessors like the 280. These are general references not related to MEMORYMOOG but contain important system concepts. TRS-80 MICROCOMPUTER TECHNICAL REFERENCE HANDBOOK, Catalog 26-2103, 1978. PROGRAMMING THE Z80 by Rodney Zaks, 1980 2nd Edition from SYBEX CZ80, Printing 10587654321 1SBNO-8958 8-04 7-4. FRONT PANEL CONTROL BOARDS 6 t 7 Left and right aide control board (L.S.C. & R.S.C.) switch cicuitry is almost identical...

Linear Ic

A linear IC with DC Input Offset measured between the + and - inputs should be no greater than lOmV apart or device is faulty. POWER SUPPLY SUBASSEMBLY TROUBLESHOOTING Troubleshoot the power supply subassembly using the circuit description. Note that voltage levels displayed on the schematic diagrams are not absolute values as reari jus may vary between units. Once the probl Uls localized, check the .suspected part by direct substitution if possible. Otherwise, use a voltmeter or oscilloscope...

008 009 001

INSULATOR, FISH PAPER 6.4 X 16.1 END CAP, LEFT HAND ALUMINUM END CAP, RIGHT HAND ALUMINUM LOGO, MEMORYMOOG ALUMINUM COVER PLATE ALUMINUM HOUSING, CABINET COMPLETE FRONT PANEL, ALUMINUM BASE, ALUMINUM STIFFENER, BASE ALUMINUM BRACKET 3 4 X 13 16 X 5 8 BRACKET 1 X 1 X 5 8 BRACKET 1 X 5 16 X 5 8 DOUBLER PLATE. BASE SIDE PANEL, LEFT SIDE WOOD SIDE PANEL. RIGHT SIDE WOOD TRIM, BLOCK HOUSING WOOD TRIM, CENTER BRACE WOOD TRIM, FRONT KEYBOARD WOOD TRIM, RIGHT SIDE WOOD TRIM, LEFT SIDE WOOD

S 4 H And Noise Circuitry

Included in the MODULATION OSCILLATOR output to U11B is the SAMPLE AND HOLD and NOISE outputs. In the lower right hand corner, the output from the MODULATION OSCILLATOR PULSE is used as a sampling pulse for the SAMPLE AND HOLD. Also, located there is U25, a 5837 pseudo-random digital noise generator followed by a pink noise filter and gain recovery amp U26A. The pink noise output is fed to a 3360 VCA volume control which is buffered by a 4558 U26B and routed out the NOISE buss to all VOICE...

Counterclockwise

RANGE SCALE HI Next adjust the TRIM to approximately EQUAL the RANGE and SCALE. HI trim note To INCREASE the HI readings, turn, OSC 2 i 3 HI trims CLOCKWISE and OSC 1 HI trim COUNTER-CLOCKWISE. Lastly adjust the RANGE to the nominal value of 7F and the other adjustments will follow automatically. This is the end of the software adjustment procedure for minor VOICE OSCILLATOR recalibration. If it is necessary to proceed to identify other out-of-tune voices and or oscillators, depress and hold...

System Controller Codes

CO Sequentially flashing LED's - a service routine CI - Cassette Save C2 - Cassette Load C3 - Cassette Verify C4 - Defeats voices sequentially - a service routine C5 - Frequency center for Osc 2 & 3 to Osc 1 (zero beats) C6 - Tuning Calibration - defeats auto tune servicing) C8 - Program enable and disable C9 - live front panel (programming) DO - through D9 are program sequence codes A - advance program chain B - back step program chain OUTPUTS Programmable volume for program level...

Switch Contact Replacement

If it is necessary to replace a spring contact switch or a contact button, extreme care must be taken when installing the new components. The contact button is replaced by first removing the switch contact, then the contact button. The contact button must be seated against the PC board. The contact button may also be inserted using an AMP hand tool, model number 274262-1. The spring contact may be replaced using AMP tool number 274268-1 or by hand. When inserting by hand, use extreme caution...

Fuse Cover

997-045885-002 FUSE PLATE ASSEMBLY (5) 806-023039-006 SCREW, PAN HEAD BLACK CLIP TYPE LAG LAG LAG (1) 962-0459 31-001 PLATE, ALUMINUM (1) 969-045948-001 SHIELD, FISH PAPER 220 VOLT EXPORT 4-40 X 3 8 5 X 20MM 5 X 20MM 800MA 5 X 20MM 315MA 5 X 20MM 3.15A FUSE COVER FORMED

Voice Modulation

OSCILLATOR 3 also has a few differences from OSCILLATOR 1 in that the KEYBOARD VOLTAGE can be disconnected through the 4016 switch U10 and instead used as a modulation source. The modulation is only about one hertz, however, driving the 3340 VCO's with a control voltage input of such a low level causes the TRIANGLE waveform to be unsymetrical. Therefore, Q2 is used as a low frequency switch. With the low frequency switch on, Q2 is turned on and places a .033uf capacitor, C23, in parallel with...

Introduction

Most of the adjustments below are interdependent procedures which MUST be performed in the order presented, however, normal oscillator recalibration HILL NOT require all steps to be performed. The Memorymoog PROMs have a considerable mount of diagnostic software built in, therefore, try the SOFTWARE TUNING procedure FIRST and the test equipment procedure only as necessary. The replacement of an IC that has an associated trim potentiometer will require recalibration, except that the replacement...

Polyphonic Glide

The DMUX board generates six independent pitches for each of the VOICE CARDS. To add polyphonic glide to each voice, in the upper left-hand corner of the schematic i6 an input line labeled POLYGLIDE. It is basically a linear glide circuit which uses a 3360 VCA. The signal for each one of the VOICE CARDS comes in on lines S32-2 through 9 and is divided down with .01 matched resistors to obtain a precise 50 reduction. These lines are applied to a 4558 which is connected as a comparitor, the...

Abbreviated Oscillator Tuning With Equipment

Using test equipment, a shortened oscillator tuning procedure may be accomplished as follows Perform POWER SUPPLY, DMUX and PRELIMINARY OSCILLATOR TUNING (Steps I, II and III) omit the next four steps - preliminary CONTOUR GLIDE, preliminary COMMON ANALOG, FILTER tuning and VCA balance (Steps IV, V, VI and VII) -unless an associated part has been replaced proceed with MAIN OSCILLATOR TUNING (Step VIII), MONOPHONIC SCALING adjustments (Step IX) and LHC -OCTAVE TRANSPOSE (Step X). Therefore,...

Main Oscillator Tuning

NOTE POWER SUPPLY and DMUX board adjustments must be verified with a 4-1 2 digit DVM before tuning is attempted. Set up FRONT PANEL controls as in Figure 3 and 15. Adjust OSCILLATOR 1 OCTAVE trim R104 for A880. 16. Repeat Steps 12 through 15 as necessary until a perfect 3 octave span is achieved. 17. Repeat Steps 12 through 16 for 0SC2 (U7 Pin 1) and 3 (U10 Pin 1). 18. Press AUTOTUNE button and the display will show 6 TUNED after about six seconds. 1. Attach Strobe tuner to the PULSE output of...

Caution Keyboard Protection

, REMOVING DMUX BOARD The DMUX BOARD is mounted below the DIGITAL and COMMON ANALOG BOARDS using four (4) standoffs. These two (2) boards must be removed to remove the DMUX BOARD. Before proceeding with further disassembly or servicing, care should be taken to protect keyboard from -Scratches from solder spikes of printed circuit boards. -Chemical reaction of special cleaners or sprays to the plastic key parts. It is suggested that the keyboard be covered with a piece of soft foam or similar...

Dac Zero Output Adjustment

Attach the plus side of the DVM probe to the far side of R67 on the DMUX board. 2. Depress the 16' octave switch of OSCILLATOR 1. 3. Adjust R10, (DAC ZERO trim) on the DMUX board for 0.000 volts. DAC FULL SCALE ADJUSTMENT (4-1 2 DIGIT DVM REQUIRED) 1. Depress the 2' OCTAVE switch on OSCILLATOR 1. 2. Adjust R8, the DAC FULLSCALE trim on the DMUX board to 10.000 volts. III. PRELIMINARY OSCILLATOR TUNING FRONT PANEL SET-UP 1. Attach the DVM positive lead to the wiper of the TUNE pot and set the...

Adsr Contour Circuitry

The contour lines enter from the DMUX board at the upper left hand portion of the schematic where the ATTACK, DECAY and RELEASE are buffered and applied to the 3310 Contour Generator. The usual ADSR contour includes an ATTACK, two holds and a RELEASE, but if a second note is played the contour would start back up from whatever DECAY or RELEASE setting it subsided to and reach its ATTACK setting more rapidly than is normal. This is not a desirable condition for the rearticulation of chords,...

Foot Pedal Circuitry

Starting at the upper left-hand corner of the schematic, analog control voltage from the rear panel FOOT PEDAL(s) is applied to UlA and U1B, the 3360 VCAs. FOOT PEDAL control AMOUNT is applied through the linear control inputs of the 3360 (pins 5 and 10 respectively) by a preprogrammed amount from the FRONT PANEL controls. The signal is buffered by a 4558 U2A& B and applied to a series of 4016 ENABLE switches driven from DEMUX board latches. Depending on what is selected from the FRONT PANEL...

Removing Front Panel

It is recommended, for ease of service, to remove the POWER SUPPLY (See POWER SUPPLY removal) before attempting the removal of the LSC. Once the CONTROL BOARD is removed, it may be placed on the DIGITAL BOARD COMMON ANALOG assembly using a cardboard separator or similar material. The POWER SUPPLY may temporarily be reinstalled for unit servicing using the two (2) inside screws. To remove the LSC board, remove the control knobs and the eleven 5 16 hex nuts, taking note of four (4) fiber washers...

Copyright 1982 Moog Music

Since you have proceeded this far in your reading, you have already demonstrated a ceen interest in at least four endeavors music, electronics, computers and, of course, SYNTHESIS. This manual can provide you with added depth in this multi-faceted knowledge and improve your long-term synthesizer musicianship. This is a preliminary service manual which will be available in final form during the first quarter of 1983, so if you or your service engineer have comments concerning the format or...

Cem 3340

re completely seH contained, precision oltage controlled OacilHtorj, featuring both exponent and line ' control aeales nd up tc four buffered outpj wavetorms triangle, aawtooth. square, and pulse with voltage controllable pulse width. Full temperature compensation makes these VCOs extremely table, anc laminates the need for a temperature compensation rtsisto' The highly accurate exponent, nd line - control inputs are virtu ' grojnd umming nodes, allowing mul tiple control voltages to be mixed...

Digital Board

The purpose of the demultiplexer is to convert the serial current pulses from the DIGITAL board to parallel voltage outputs to drive the analog circuitry. Analog data, specifically from the DAC, consists of serial current pulses with a variable magnitude of 0 to 3.32 mA. These current pulses are converted to a serial voltage pulse stream with a directly proportional magnitude between 0 and 10V, by U5. , Capacitor C5 damps U5 to minimize overshoot and ringing. Also note the DAC will constantly...

The

The VCF filter is a 24dB octave patented Moog filter and it uses an IT122 monolithic matched transistor pair at the top and bottom of the filter ladder to cut down on voltage offsets and improve the current control signal rejection. All the outputs of the OSCILLATORS and the NOISE source are coupled to the base of 011 2 via C26. Qll 1 and 2 convert the input signal to a differential signal current in the ladder. The collector, capacitor C31, and the next set of emitters 09 and 10 form a 1 pole...

Arpeggiator

Unlike conventional arpeggiators that are limited to playing notes up and or down the keyboard, the arpeggiator in the MEMORYMOOG is more like a micro sequencer in that it arpeggiates notes in the order depressed. The arpeggiator will then play them forward or forward and backward. This gives a variety of musical patterns limited only by imagination. The notes can be latched so the arpeggio will continue to play after key release. Notes in the pattern can be replaced in real timr-Hsy adding new...

Memorymoog Display Boards

ELECT. 10 UFD 25V ELECT. 10 UFD 25V C20-C22 947-04518 3-104 CAPACITOR, CERAMIC TUBULAR .1 UFO ELECT. 220 UFD 16V TUBULAR .1 UFD TUBULAR .1 UFD ELECT. 220 UFD 16V TUBULAR .1 UFD BOX 4.7 NFD PC MTG. LINEAR 10 GLIDE MTG. LINEAR 10K BEND AMT MTG. LINEAR 10K MOD AMT MTG. LINEAR 10K FT. PED. 1 AMT MTG. LINEAR 10K FT. PED. 2 AMT MTG. LINEAR 10K MOD RATE MTG. LINEAR 10K VOICE MOD OSC 3 MTG. LINEAR 10K VOICE MOD VCF MTG. LINEAR 10K TUNE MEMORYMOOG DISPLAY BOARD PARTS LIST REF DES PART 2 904-041406-009...

Keyboard And Case Maintenance

To clean the wood end caps, the aluminum chassis and front panel overlays, a damp cloth with a mild detergent is sufficient. The keyboard may also be cleaned by using a damp cloth and mild detergent. However, if there is light dirt or scratch marks on keys, hand rubbing with a fine polishing compound works best. For deeper scratch marks or ground-in dirt, a variable high speed drill with cloth buffing wheel is recommended. The buffing wheel should be used carefully with a small amount of fine...

Noting The Autotune Parameters

O Hit C, 7, ENTER and ENTER again the display will then query VOICE hit the number of the voice above, which was out-of-tune, BUT DO NOT HIT ENTER Wait a second and the display will then query OSC hit the number of the oscillator above which was out-of-tune but, again, DO NOT HIT ENTER the display will then flash an expanded scale version of the AUTOTUNE voltages in a hexidecimal HEX format indicating from left to right a two digit RANGE, SCALE and HIGH TRIM code. O WRITE THESE VALUES DOWN with...

Performance Orientation

Programming is made easier by first making almost everything programmable except for tune, final volume and headphone volume. Secondly, a full complement of knobs and switches have LED indicators. These first two features allow set-up of your personal programs just like a non-programmable monophonic synthesizer. Next, there are 64 locations where these programs can be stored. If 64 is not enough, included is a cassette interface so programs can be stored on an inexpensive audio cassette deck...

Voice Card Troubleshooting Guide

The MEMORYMOOG has a software routine to isolate defective VOICE CARD OSCILLATORS. Depress the AUTOTUNE button and observe the display. In 5 to 10 seconds, the display will show X tuned, where X is the number of usable voices. X will equal 6 if all VOICE CARDS are good. If X is less than 6, faulty VOICES can be isolated as follows 1. Depress C7 followed by ENTER twice. 2. The display will show VOICE 7. 3. Depress any VOICE number 1 through 6 desired To be tested, where VOICE A 1, VOICE B 2,...

Power Supply Adjustments

-15V SUPPLY ADJUSTMENT 4-1 2 DIGIT DVM 1. Attach the negative DVM probe to the negative side of C74 and the positive probe to the negative side of C75, both on the DMUX board. 2. Adjust R8 on the POWER SUPPLY board for 15.000 volts. 15 VOLT SUPPLY ADJUSTMENT 4-1 2 DIGIT DVM REQUIRED 1. Attach the positive lead of the DVM to the plus side of C74 on the DMUX board. 2. Adjust R19 on the POWER SUPPLY board for 15.000 volts. 1. Attach the plus lead of the DVM to the positive side of C73 on the DMUX...

Battery Backup

RAM battery backup is accomplished by a 78M05C 5-volt regulator that is used to generate a 5.6 volt supply for the RAMS. A 5.6 volt supply voltage is obtained by using a diode drop in the common leg of the regulator to ground which biases the common to 0.6V. The diode in series with the output drops it back down so at the junction of the three diodes, CR4, CR5 and CR6, the VRAM supply ends up at approximately 5 volts again under normal circumstances. A lithium battery voltage source provided...

Memorymoog Specifications And Functions

The Memorymoog is a versatile six-voice, programmable polyphonic synthesizer with the classic Moog sound, boused in an anodized aluminum cabinet trimmed with selected walnut. All Menorymoog functions are under the control of a Z-80 micro-computer which continually monitors the soundpath, responding to all performer input through the keyboard, panel controls, foot pedals and system controller. The front-panel settings are stored as a program. The Memorymoog will remember 100 programs. These are...