Change Information

(Each heading is followed by address to the circuit diagram.) 1. NOISE GENERATOR (D-H, 18-27) IC3 from TL082 to BA662 having AGC. NOISE LEVEL VR1 omitted Only white noise is routed to S H circuit regardless of VCO-2 RANGE position. New circuit Pink noise is selected for S H when RANGE is in LOW position. Ladder Resistors from discrete to resistor array 3. NOISE KILLER SWITCH (D-E, 28) Newly attached for cutting off noise signlas. Used in particular adjustments. Close this switch when step...

Prom Replacement

When replacing PROMs A, B and C with different version, replace them in a set. Version 3.2 can replace 3.1, 1.0 and 0.7 Version 3.1 can replace 1.0 and 0.7 The reverse does not hold true. ROM 3.4 can replace 3.3D and vice versa. NOTES PROM D is required only when OC-8 or DCB BOARD is present. PROM D must be used together with A, B, C of 3.2 version and up. PROM D contains diagnostic programs. Refer to P.46 for test procedure. Difference between 3.3D and 3.4D is that the latter has debugged...

Jupiter8

TL J_ rr I I 1 1 1 1 ' If er e > r& g i n i i , i 1 i 8-j p j- j - S1 f -ff 1. Connect scope to TP-4 of any MOD. Press A2 key, adjust timebase and vernier (VARI) to display one complete cycle. 2. Press A3 key. Sway and hold BENDER Lever at extreme left, adjust VCO BEND to display 1 cycle. 3. Press A1 key. Sway and hold BENDER at extreme right, set VR3 for complete 1 cycle.

Gbih Out A 3

21 RESONANCE 31 hpf il EWV2 KE -o 3< t env3 A. -O 35 vcolRANGE -o 3g env2 > . -O EH V 1 2. -o 38 ew2 r. -o < t nv1 t.f. 1+3 vcf l db ) o h env a. -o ug envi -0 -O 47 VCP CUTQFF -o ue Envi r. -c us envi fola So EKIV1 s. There ahs W> oliWerehl GND lines, is rat cmnedet) Wj on t s PCB. Hi3kesl Re-f. Des, are IC 40, OS , CSO, VR236 MODULE BOARD OPH124(149H124) (pcb 052H270) ns tecfct d OK- Sl< Su.- rate TLOSC S pes CID C3hbOK. 25 CZ3 wtefcal flli*i.RB25FX 23 p S.stat-E)ls-C33CiS61

Module Controller Oph123

POWER SUPPLY board B (100 117) PSH061 (etch mask 052H302) POWER SUPPLY board B (220 240) PSH062 (etch mask 052H302) POWER SUPPLY hoard C PSH060 (etch mask 062H303) power Tr GHS 1 4A (CPU board) MGP0003 (3.OA) prim. 100 117V CEE T1.6A prim. 220 240V CEE T5.0A sec. 220 240V SEMICONDUCTOR IC (* CMOS) 15159114HO

Key Split Point

To make JP-8 more convenient for the user to play on, key split point becomes under the control of the player. DIGITAL COMMUNICATION INTERFACE OC-8 amp DCB To have JP-8 externally controlled through Digital Data Bus connecting either to digitally operating musical instrument or to Analog Digital Interface Unit e.g. OP-8 that accepts analog CVs in parallel . Digital Communication Interface Board DCIB is built in. OC-8 First, DCIB is named OC-8 and sold as an optional kit. DCB Second, another...

Substituting This Board For 12bit Dac Board

The D A Converter IC14 is changed from 12-bit Am6012 to 14-bit ITS80141 with this PCB version. Along with the change the following parts are also changed. LS273 TTL, IC13 LS175 TTL, ICI 5 LS175 TTL, IC11 4051 IC25, IC26 74LS74 IC9 40H273 CMOS, IC15 40H174 CMOS, IC13 40H175 CMOS HD14051 Hitachi only TC4013 Prepare PROMs for CPU board A, B, C 3.2 version inevitable when OC-8 exists for IC34-IC36 Replace existing PROMs with these PROMs. Adjust DAC circuit, referring to 4. DAC on p.25 of this book....

Precautions

Do not expose your workbench directly to fans, heaters, air-conditioners, etc. especially after disassembling, most circuits are temperature-sensitive. The adjustments on the JP-8 should not be done more than necessary. Adjustments merely attempted on a particular module VOICE might cause sound balance away from entire VOICEs and can, in an extreme case, require the same procedures to be done fifteen times for the remainder. . . DESIGNATION - TEST POINT, TRIMMER, PCB - For PCBs that are...

Pcb Edition

Dot and circle above PCB code are indicative of edition stands for 1, and o for 5. Example o 6th edition. Illustrated on pp. 48-50 is information on MODULE and MODULE CONRTOLLER Boards mounted on the JP-8 models with serial numbers up to 090599. For circuit diagram, refer to p.11 or p.12 although some small discrepancies may exist. CAUTION ON REPLACEMENT OF PCBs IN THIS SECTION Although terminal for terminal compatible, when mix used, new and old PCBs process signals in slightly different way,...

Pin Functions

ADDRESS BUS Transfers 16 bits to memory address decoders CPU board- IC21, 22 and 23 for controlling the followings on CPU board - ROM, CMOS, RAM, N-ch RAM, TAPE and TUNE reading. on MOD CON board - RAM, UP, LO and VCO select. Lower 8 bits are transferred to I O Address decoders Interface board - IC1, 2, 3. 4 and 8 for controlling the followings IN - Function sws, Digital IN 1, 2 and 3 , Key IN, A D. OUT - Dot LED, Num DED, Matrix, Analog sei, Key out, D A Up Lo, KCV sei, Gate out, EXT synth,...

Computune With Tune Button

When the computune program is triggered manually with TUNE button after power-on-tune , it runs only once for each VCO since the program already had data on fine tune, and drastical change in VCO frequencies is likely to occur. If the program fails to compensate frequency drift, iterative tapping of TUNE will bring VCO closer to correct pitch. Relying on this method is prefarable only in an emergency the cause of out of tune must be eliminated as early as possible. Lines 11-17 Reads as follows....

8v 9v

In this mutual arrangement any KCV VKnx at a key Knx is obtained from the equations VKnx VKno W WIDTH x Knx or VKnx T TUNE -W 84-Knx where, W 1 12 V voltage steps per half tone T VKn84 In the following computuning, T is a reference voltage in calculating every KCVs to the equation 2 above. Upon power on for the JP-8, computune program starts frequency measurements at two points with MOD.A VCO-1 by applying KCV of Kn24 3V and VKn84 8V to it. If the VCO output is 20 cents higher than expected...

18 19 20

77 - gt 57 KA TFZ - BtOSKA TK3.4. 5.6 - K30A 77 - gt 57 KA TFZ - BtOSKA TK3.4. 5.6 - K30A PANEL BOARD B OPH126 149H126 pcb 052H272 LEVEL SELECT BOARD 0PH139 149H139 pcb 052H330 S 10 11 12 13 14 15 16 1 18 19 20 21 PANEL BOARD C OPH127 149H127 pcb 052H273 View from foil side All sliders UE9RC16B14 All rotary pots VM10RK20B14 All rotary switches SRM1034-K15 All sliders UE9RC16B14 All rotary pots VM10RK20B14 All rotary switches SRM1034-K15 All sliders LFE9RC16B14 All lever switches SLE622-18PS...

Jp8 Service Notes

2Wi X II 13149103 115V 2Wi II 13149104 220V This Notes makes First Edition obsolete and consists of two parts Part 1 Previous First Edition pp.- _3i Part 2 Mainly applicable to JP-8 units with Serial Numbers Slide switch SSB-023-12RN 13159117 CANON connector socket HA16R-3P 13439851