181009 D

REDUCING NOISES ON GROUND PATH CONTROL BOARD-A, B, C Noises are induced on GND of these PCBs while the ground path is passing through Mother board to DC source, causing ripples to be superimposed on Control board output voltages. To by-pass M board, the jumper leading to A4 pin no.l is removed. A wire is placed between the GND and ground lug on top panel as shown below. This modification would be effective if frequency fluctuates during VCF osccil-lation with RES knob raised.

27

DIRECT WIRINGS -15V & GROUND, TUNE & PORTAMENTO POWER SUPPLY to MOTHER AND KEY ASSIGNER BOARDS KEY ASSIGNER to CONTROL BOARD D resulting fron 6 connect or s' loose contac Tr. has been done at the factory with 871600 and subsequent, and will prove < on the products left undone.

6 Other Circuits

This is the circuit through which the control signals are drown out from Data Bus (DB7- signals to DMPX, IC11 4052 and Total Gate DBO) as instructed by the pulses from ALE On the Key Assigner, there is also the 6-bit D A Converter of the type called The current summing type. The D A Converter, IC8, IC9 4049 is enabled by either OV or -15V. But, the signals are either OV or +5V when they come out from the Latch output. It therefore become necessary to have a means here of a voltage shift to make...

Co

Figures in TP colum in the table to immediate right and fig-ares at top of the other tables refer to test points shown in the PCS layout below. The following applies. 1. For sliders voltage will vary within the range of 0V to +5V as the designated slider is being moved. 2. For switches the output will be a logical 0 (low) or 1 (high) (OV,+15VM-15V,+5VMOV,+5V) , depending on the lever position In replacing the Mother board, check both the existing board and the new replacement board for...

Effects Of Digital Voltage On Adjustments

Moving of slider on the panel delivers control voltage in series of steps to the subsequent stage which in turn varies its parameter in digital steps. When the slider is set between steps, result is jolting or jittering output since control voltage jumps up and down between these two steps. Significant effects may be seen on adjustnr-x sections are VCF- RESONANCE FREQ., WIDTH, MODULATION DEPTH, etc. in which slider is to be set midway travel range. In such a case, set knob at a point where...

Important

Checking the DC voltages is the must before attempting any adjustment. Allow five minutes warm up for circuits stabilization KEY ASSIGNER BOARD ( 0 5 2 - 0 3 2 ) KEY ASSIGNER BOARD ( 0 5 2 - 0 3 2 ) Connect Digital Voltmeter to TP-1. 1. Adjust Trimmer 1 for -15-000 +10mV.

Improvements On 181022b

Capacitors and Diode for ICll protection S N 861500- C26, C27 and D4 are connected to IC 4052 as shown in dashed cicles on circuit diagram, facing page, to protect it against breakdown due to charged voltages. Connector By-Pass Wirings - for stable CV and VCO voltages - Plugs and receptacles on D7 (Key Assigner) and J-4 (Control Board D) are solder jointed, or leads are directly soldered on conductive foils at terminal areas. This treatment also eliminates impedient Portamento effects in...

Info

VCA LEVEL is to be determined by amplitude margin at the subsequent stages, which can be examined by playing cord with ENSEMBLE on. Set trimmer 3 on each MODULE BOARD(A,B,C,D) for 400-450mV. Press keys as follows. A Press A2 key. B Press and hold G2 and A2, then release G2 key. C Press and hold F2,G2,A2, release F2 and G2. D E2,F2,G2 and A2, release all but A2 key.

J11

Modification -Module Controller- Follow the dotted lines solder resistors in parallel. When VR4 47K, R135-22K, 47K and 22K in the dotted parentheses are not required. Practically difficult, no component holes in the PCB to accommodate Q20 and Q21. Some steps are different between versions 052-314 A B C 11-A 052-314 D E ll-B

Jp4

It might be necessary to know what voltages exist at D A converter output when a particular preset button is on, which would aid to judge tonality of the factroy programed voices. Shown in the table below are D A-converted preprogramed data from ROM that are fed through Demultiplexer and S H to Module and Module Control boards to characterize Preset voices in reproduction process. These voltages are to be logically available at point A in Fig. below, but practically cannot be measured. For...

M

TEST POINT TP-3 (MOTHER BOARD) PUSH BUTTONS P0LY-2, MANUAL 1. Press A2 key, set trimmer 17 of Module board A for 500Hz. 2. Adjust remaining modules B, C and D to 500Hz using module A's output as a reference signal. This can be done by displaying two waveforms at a time in the following key plays. MODULE B Press and hold G2 key, then A2 key. MODULE C Press and hold keys in this order F2, G2, A2, release G2 only. MODULE D Press and hold E2,F2, G2, A2, release F2, G2. These frequencies may not...

Module Board

MODULE CONTROLLER BOARD Sections 7-26 except CHORUS CHORUS ENSEMBLE BOARD Sections 27-28 DIFFERENT ADJUSTMENT BETWEEN SERIAL NUMBERS & VERSIONS Before replacing PCB, refer to pp.12-2, 16-2 for compatibility, modifications involved or PCB combination. Some adjusting sections and steps are selectively applicable to particular PCB as shown below. Steps are different from for other versions. ( ) Sole adjustment to this version.

Module Controller

Module Controller Board is to control those c Module Board as follows VCO modulation VCF modulation VCA modulation Generation of the clock signals to control ENV GEN. Cutoff frequency of HPF Pulse width modulation of VCO The Module Controller performs these functions by converting the control signals fed from the Mother Board or those fed from the Bender Board into such signals to suit for controlling the modules. Here also included are the Noise Generator and LFO Delay Circuit.

R87 R85

Information about REPLACEMENT, MODIFICATION and ADJUSTMENT 1. Replacement Replacement will be a new one, it requires some modifications on itself when it replaces old one. Or it requires other PCBs to be modified when new VCF is needed. Note that Modules A, B, C and D in the same JP-4 must be identical.

Read Through Additional Pages

Even if they seem to have no relation to the work contents on additional pages will supplement or correct those on the original pages may include improvement on early products, since originals are kept unchanged as possible. Often on several pages, will appear the same ex planation that makes it well understood. pages have interrelations in terms of alteration, pcb combination and so forth. The quadruplicate stages in the 4-voice JP-4 circuits require the same IC to be mounted for the same...

Specifications

OSCILLATOR) VCO RANGE (16'. 8'. 4) I VCF (VOLTAGE CONTROLLED FILTER) KYBD FOLLOW li0f'. 40 . 70 -. 100 l LFO (LOW FREQUENCY OSCILLATOR) LFO RATE (OVER 0 1 H 80H I I (ENVELOPE GENERATOR) (or the VCF.VCA 2 ATTACK TIME (0.6 ms-3 Sec) DECAY TIME (14 ms 10 Sec) SUSTAIN LEVEL (0 100 ) RELEASE TIME (14 ms 10 Sec) FIRST READ PP. 12-2 & 16-2 INFORMATION ON

Circuit Description

In the conventional synthesizer, the circuits (VCO, VCF, VCA, etc.) are directly controlled from the control panel. In the coaipu-phonic synthesizer, it is the computer that comes in between and provides control voltages suitable to those VCO, VCF, VCA, ENV GEN, etc. Compu-Phonic Synthesizer is composed of the Synthesizer Control Circuits with iPD3048 as its central point and the synthesizer circuits which are fully controlled by - Switches and Sliders -Sliders and switches on the control panel...

Xtal 1 Xtal 2 Reset

Inputs for internal Clock Oscillator Reset pulse input Comparator output signal input during A D Memory read timing signal output Memory Write timing signal output DB Data latch pulse output The iPD8048 is an 8-bit parallel computer fabricated on a single silicon chip. The 8048 contains a IK x 8 ROM program memory, 27 I O lines, an 8-bit timer counter and clock circuits. Used in the Compu-Phonic Synthesizers are ))PD9048-012 and yjPD-8048-011 (JP-4 only) versions in which programs and data...

Holder

064-186A N0.I86A (Module, Module Controller-Mother) 064-049B No.49B (Panel No.218G-Control A,B,C) 064-050B No.50B (Panel No.218G-Control Board A, B, C) 064-184A N0.I84A (Module, Module Controller(left)-Holder N0.I86A 064-185A No.l85A (Module, Module Controller(right)-Holder N0.I86A 064-187E No.l87E (Power switch) 064-188B N0.I88B (Keyboard-Bender Panel) 064-189C No.l89C (Sideboard-Panel No.218G) 064-190A No.l90A (Keyboard-End Block)(necessary for earlier products) 064-203B No.203B (Bender Board...

Vcf

APPLICABLE TO S N xx 4100 and higher or PCB 052-314 E w trimmer 31 (VR11 on circuit diagram) Just change above panel setting by pushing VOICE This adjustment should be made only after finish of all other VCF adjustments and should follow imediately Section 24 with VOICE button pushed in. Observe every module board1s waveform on the screen, adjust trimmer 31 for uniformity in shape and in level. 26. NOISE LEVEL module control board Connect scope ground to GROUND 3 on Mother board.

Changed Parts

Although the manufacture has already employed new Parts Coding system (8-10 digit), this list keeps thoroughly the old one to avoid confusion. Parts order in old number will be translated into new at the factory. Each pcb can replace earlier versions with or without involving alteration, see page 12-2 and individual sections. 181-022C Key Assinger (pcb 052-032C) 181-019D Mother board (pcb 052-364D) 181-020E Module board (pcb 052-314E) 181-021E Module Controller (pcb 052-235E) 181-023E Chorus...

Ttttt

O> > > > > > > PHS& SBSiziS KlpqpqpqixipqpiqpriKi fo PH P4 < i o o o o o > > > t> > MOTHER BOARD TIMING DIAGRAM in MANUAL MODE (SLIDER SWITCH READ HOLD, A D & D A CONVERSIONS, MPX and DMPX) Figure below is part of CP9, 11, 12, 17 and 13 at the left showing functions and timings of A D, D A conversions and the Switch reading. Studing D A conversion theory on the Mother Board by observing the converter output waveform is very helpful in understanding the operation...

L

When Arpeggio Selector Switch is depressed, Key Assign Mode is turned to POLY 2, too, because qf the Selector's contacts wiring (refer to Control Board F circuit diagram) Under Arpeggio Mode, U040-011 aends out KCV and GATE signals following the Arpeggio pattern with one note each at the rise time of the clock pulse on T1 pin. When the mode is UP mode, KCV is output with addition of 1 volt each. Or on DOWN mode, it subtracts 1 volt each. Or with UP DOWN mode, it is witli the combination of...

13 Vcf Envelope Balance Module Board

NOTE POLARITY - NORM Use key pressing arrangement shown in Section 7. To let your left hand free from key play, 1. while pressing A2 key for module A, CMa10 push HOLD into ON. 1 F 2. While moving ENVELOPE MOD slider 0 to from 10, adjust trimmer 16 of A module for no frequency change. 4. Duplicate steps 1-3 for other three modules.

Ii

According to the turns of the key depressions, the situation of the key depressed at such particular time, and the position of the key Assignment Mode Selector, 8048-011 makes assignment of KCV and GATE signals to the 4 Module Boards. 8048-011 makes use of the 6 bits of DBO to DBS for KCV out and 1 bit of DB7 for GATE out. It puts them together into 1 byte format and sends it out, group by group,to the Modules, A,B,C and D in time sequence. These digital data in 6-bit that conie out of 8048-011...

Description Jp4

- Reading of CONTROL PANEL -The PROGRAMMABLE SECTION The 8048-012 reads the patching on the Control Panel and converts them into digital data of 16 bytes. ( lbyte 8 bits) Of the Control Panel,the section namedPROGRAMMABLE consists of 16 pots and 14 switches, these 16 pots produce 16 different kinds of analog voltage varying between OV to 5V. The 14 SWs, on the other hand, produce binary digital data of H or L, given by +5V or OV, respectively. The 16 analog voltages that come in parallel to...

Cis

Primary Circuit Change Circuits in dash circles concern VCF control system. The modifications show constant voltage application for use together with Module board 181-020 -D, -E or -F, while orig- MODIFICATIONS ON MOTHER BOARD other than those described on the left 4. Disconnecting ground path from Control Boards A,B and C The jumper wire leading to pin 1 of terminal A4 is removed to prevent noises from being induced on control boards. With Serial Number 820950 Refer to illustration on back...

Ghd 1 I

Before soldering, local and ground points, and for the voltages since the jumper wires on the foil side and terminals are different from pcb to pcb, the drawings on this page as a reference, not a practical without this jumper, solder wires at point A without this jumper, solder wires at point A Components, jumpers and pattern cut on foil side

Adjustment

DESTINATIONS of CONNECTORS El Mother Board IC30 Output Mixer Control Board D via Module Controller B5 1,2,3 Module Board 03 2,6,8,9 VCF,VCA, ENV GEN T7 1 Mother Board,Module Eoard Cl l-4 D6, Control Board except D Module Controller B3 7,8,9 B4 l,2,3 E3 Chorus Ensemble Board Fl

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...

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...

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...

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...

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

8048 Block Diagram

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

Roland Jupiter

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...