3
PUSH BUTTONS ENSEMBLE amp HOLD- OFF POLY-2 amp MANUAL- ON Use the key pressing arrangement given in Section 15 VCA ATTACK but the last key pressed should always be C2. Note the attack time for 4 VCFs. Attack time is defined as the time from pressing the key to the time when the increasing frequency drops suddenly. Using the same key pressing method, adjust trimmer 22 so that the shortest attack time noted becomes 3 seconds. Check that the remaining attack times are within 3 seconds 40 . 19. VCF...
Jp4 Adjustment
The last page of this ADJUSTMENT has a foldout which shows location of test points. Numbers in circle on the figures in this adjustment refer to trimmer potentiometers used for adjusting, whose designations are independent of those on circuit diagrams and PCB layouts. In some PCBs, exact trimmer location may differ from representaion shown below. Some PCBs have fewer preset potentiometers. CAUTION - Pour Trimmers, CONTROL BOARD G - Always set these trimmers at midpoint before starting...
Basic Controls Settings
Trimmer 31 P- INV of Module Board 052-314E later version,S N xx4100- All midpoint. These settings allow each adjustment step to be made with minimum reset. CONTROL BOARD-G 052-236 all pots at midpoint CONTROL BOARD-G 052-236 all pots at midpoint 1. DC VOLTAGE 15 Volt power supply board
Pcb
181-006D Control Board A Etch mask 052-330D 181-007D Control Board 3 Etch mask 052-329D 181-008B Control Board C Etch mask 052-328B 181-009D Control Board D Etch mask 052-331D 181-011A Control Board E Etch mask 052-335A 181-012C Control Board F Etch mask 052-237C 181-013 Control Board G Etch mask 052-336 181-019B Mother Board Etch mask 052-364B 181-020C Module Board Etch mask 052-314C Serial No. up to 790799 Etch mask 052-314D Serial No. 800800 and higher 181-021C Module Controller Board Etch...
I Module C
is highest amplitude, lower the highest. This will increase other modules' level, the new highest, then to next until four modules are equal in Keep amplitudes close 200mVp-p with RES knob if one module mis-up the knob a little. Repeat trimmings until none is outsized. s begin resonating simultaneously when RES 11-B. Serial Number with 800800 or PCB 052-314 D or E 1. With trimmer 18, find a module least accessible to 200mVp-p. Set other modules for that value with trimmer 18. 2. Set RES for...
Module Board
same as for Section 11 but RES knob at 10 1. Use key pressing arrangement shown in KEY ASSIGN LOGIC or Section 7. 2. Panel setting and test point are common to all versions. Scaling of resonating VCF can be done by different methods. Below describes procedure using scope's graticule as a measure. Lissajous method shown in Section 10 can also be adoptted. Apply reference sinewave of 880Hz to scope V.IN and adjust time base H for 2 cycles across graticule. Disconnect reference note from, and...
Differences From The Predecessors
Using IC12 IR3109 for VCF in place of BA662 selected. Adding VCF INV ADJ. for easier preset VOICE sound tailoring. Although interchangeable with former PCBs, the following are involved when replacing Different steps for VCF FREQ and WIDTH adjustments Some alterations on this pcb - when existing one is 181-020 B or C -to meet circuit configuration indicated on p.19 in this case read 181-020D as 181-020E . BA662 also see p.16-2 2 The BA662 is a current controlled variable transconductance vari-gm...
Info Llm
Basic differences between the designs Old circuit right Current from Constant Current Sources is shared with four ICs. Changing one trimmer changes the upsets the balance of the other modules. Adjusting the to accurately divide the current sources is difficult. New circuit left In the new circuit, the trimmers of each other because they are supplied from constant IC27 and IC28. Q20 and Q21 serve as V-I converters.
4j52
the antilog current o keep the balance it sends regain balance. These are the process how to output frequency which is antilog-proportional to the it voltage. The pulse output here is of so nar-width as yet. jt is necessary therefore to 'ide further wave conversion. IC7 is a multiplexer divided frequency, IC6 is a frequency dividei to make selection from the IC5a generates sawtooth waveform synchronized to that of the selected frequency. The amplitude of the sawtooth waveform is kept constant...
Info Rcm
IMPORTANT Replacement of 052-032 A or B with necessiates change of VR3 2MA on Control Board D to 50KB to retain the time constant by compensating for difference between circuit configurations. See p. 12-2. '-Jf puBioa Connect amplifier speaker to JP-4 Out jack. 1. Hold down CO key until every note reaches the same pitch. KEY ASSIGNER BOARD D4 052-032 2. Hold down C4 key. The time required of 4 notes to become steady pitch is 4-5 sec. If there are variations in time lapse, juggle C13-C16...
X
Each time, the D A output approaches successively nearest to the A D input voltage. And finaly, when 8048 completes them all for DB7 to DB2 for bits, it has decided the data on the nearest approximation to be equal to that of input of the A D converter. Here provided on this Compu-Phonic Synthesizer are CMOS RAM, IC2, 5101 for memory of the tone color timbre data to be used on Compu-Memory and ROM which resides in 8048-012 for use on PRESET mode. 8048-012 outputs from Port 1 the address data to...
1r3109
The IR3109 contains four variable transconductance amplifiers designed for VCF applications in electronic musical instruments. The device is equipped with four high input impedance buffers, and anti-log circuitry V-in to I-out which controls conductances of four amps. . wide transconductance variable range ljil -lOmU . low input offset voltage less than 3mV . high input impedance. MOS P-channel buffer
Jp4 Description
In the Mother Board included are the microcomputer 8048-012 and its perpheral circuits, refer to the General Block Diagram when reading the following 2. The 8048-012 takes in at first the voltage data of lt of the Slider pots on the Control Panel and converts it into 6-bit digital data. At the same time, it reads out Switch Position on the Control Panel and converts it, too, into 2-bit digital data. The two data thus obtained are combined to make a total 8-bit data. These are held there for a...
Overall
SIZE 9 6 W X410 D x 179 H mm ACCESSORIES. 2 5m hookuo cords 2 Gray 016-008 Black 016-081 White 016-085 Red 016-086 Green 016-087 Yellow 016-088 Blue 016-089 Screws 2 , 2 Keyboard and Left control ur.it removal For only Left control unit removal Screws 2' , 3 4x60mm Oval BC Fe Dished washers 4mm 2pcs each 4x25mm Oval Fe BC Dished washers 4mm Nylon Rivet Bender Connector Control Board Holder KRP-335 4pcs Unit PB-4 Assy Bo.264 D 181-009 , 2 2041 Feet Collar 4pcs blk BU4850CA25 111-024 Screws 4pcs...