Casio CPS-85 User Manual

CPS-85CPS-85ELECTRONIC KEYBOARDPOWER VOLUMETRANSPOSEOFF ON MIN MAXF#GA BC D EAB C#EFDIGITAL EFFECT TONE MEMORYPIANO 1PIANO 2E. PIANO 1E. PIANO 2HARPSI

— 9 —POWER AMPLIFIER (IC101 : LA4620)The power amplifier is a two-channel amplifier with standby switch.616 2 10 11 1312Pre-driveAmp.InputAmp.PowerAmp

— 11 —MAJOR WAVEFORMS1 ADP (POWER) signalJE connector pin 52 NMI signalJE connector pin 73 KC0 signalJD connector pin 154 KC1 signalJD connector pin

— 12 —PRINTED CIRCUIT BOARDSMain PCB JCM423-MA1M Sub PCBs JCM423-MA2M/MA3M/MA4MBottom ViewTop ViewTop View872134659 10

— 13 —SCHEMATIC DIAGRAMSMain PCB JCM423-MA1M12876534

— 14 —Sub PCBs JCM423-MA2M/MA3M/MA4M109

— 15 —Console PCBs JCM423-CN1M/CN2/CN3M

— 16 —Keyboard PCB JCM886T-KY1M

— 17 —Keyboard PCB JCM886T-KY2M

— 18 —Keyboard PCB JCM886T-KY3M

— 19 —EXPLODED VIEW272432223228R-129261791025222123415207681R-2R-3519181416111213R-4

— 1 —CONTENTSPageSpecifications ...

— 20 —35333531303432SP-2

Notes: This parts list does not include the cosmetic parts, whichparts are marked with item No. "R-X" in the explodedview.Contact our spare

Item Code No. Parts Name Specification Q RMain PCB1 6925 9150 PCB/ASSY (MA1M) M240661*1 1 ALSI1 2012 4494 LSI,DSP HG51B277FB-1 1 ALSI2 2012 1764 LSI/S

Item Code No. Part Name Specification Q R16 6921 6340 KEY/BLACK M311949*1 36 A17 6921 4771 SPRING/KEY (W) M411982A-1 52 B18 6906 6352 SPRING/KEY (B) M

8-11-10, Nishi-ShinjukuShinjuku-ku, Tokyo 160, JapanTelephone: 03-3347-4926MA0700571A

— 2 —ELECTRICALCurrent drain with 12 V DC: No sound output 240 mA ± 20 % Maximum volumewith 24 keys from C1 to B2 pressed in Jazz organ tone 2

— 3 —BLOCK DIAGRAMButtonsKeyboardFI0 ~ FI10SI0 ~ SI10KC0 ~ KC7KI0 ~ KI2MIDIINOUTWorking StorageRAM (64K-bit)LSI2HY6264ALLJ-70MA0~MA12MD0~MD7MD0 ~ MD15

— 4 —CIRCUIT DESCRIPTIONKEY MATRIXNote: Each key has two contacts, the first conatct (1) and second contact (2).KeySecond contact (2)First co

— 5 —NOMENCLATURE OF KEYSPOWER SUPPLY CIRCUITThe power supply circuit generates five voltages as shown in the following table. VDD voltage is alwaysge

— 6 —CPU (LSI4: GT913F)The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.The CPU detect

— 7 —DIGITAL SIGNAL PROCESSOR (LSI1: HG51B227FB)The DSP receives 16-bit serial sound data from the CPU and adds the selected effect to the sound data

— 8 —FILTER BLOCKSince the sound signals from the DAC are stepped waveforms, the filter block is added to smooth thewaveforms.DAC (IC1: UPD6379GR)The