SERVICE MANUAL - Warning Will Robinson
Contents
1. D eee 5 9 134 ASS Y 15 38309021 Condenser MIC WM 034CY 16 69070321 Sponge 129 M42612A 1 10 MINI KEYBOARD UNIT 49 17 69082020 Key set M2S M42944 1 18 69082030 Key set M2 M42943 1 19 69123651 Contact rubber M2 31904 1 20 69123661 Contact rubber M2S M31905A 1 21 69123673 MKB stopper M2 31902 1 22 69123683 MKB stopper 25 31903 1 23 69123692 MKB stopper 49 M42468B 1 24 69123723 KB chassis 498 1819 3 x xmgon0ono 11 KEYBOARD UNIT 25 69121871 Contact rubber M1 5 M31929A 1 26 69122552 White key set M2 5S M17608 4 27 69122590 Black key set M2 5S 1761 4 Notes New parta Rank A Essential Q ty Quantity used per unit B Stock recommended 4 The minimum order and supply quantity C Others X No stock recommended 24 me DM 100 Parts List 28 69131492 Contact rubber 908 29 69143910 Key blind 30 69143920 Chassis 12 LOWER CASE ASS Y Battery cover 32 sub 8ss y 32 69143751 Lower case aub ass y 33 69028140 Battery spring 90 34 69000631 Battery spring 90 Notes New parts Q ty Quantity used per unit 310398 2 M210167 1 M210183 1 M3663H 18 M210234A 1 M41226 1 M4222A 1 The minimum order and supply quantity 35 Rank A Essential B Stock recommended Others X No stock recommended DM 100 Parts List DM 1002. TT TTT ag WCLK J WCLK 2 CH OUT X CH Output ACHI 4 Ourour c2 aur C Timing Chart 20 UNEAR CIRCUITS Upper and Lower voices from Pitch Envelope Mixer and DAC are filtered mixed and amplified in the linear circuits POWER 5V Upper and Lower CPUs start the power ON Se ences when they receive pulses from terminal MIs When the power switch is turned ON a low level differential pulse is provided to terminal MI of Lower CPU Since Upper CPU functions in the negative logic the differential pulse is inverted by transistor T15 Each CPUs determine the power switch s set position by receiving 8 certain key scan signal from a ON OFF CIRCUIT Power ON detection rex Power ON UAE CPU 1 M D start Power Tis Switch Power ON Upper CPU MSM6283 Power OFF detection zz CPU start Lower CPU 9 093860 OTC143X5 25B808F G AC T certain terminal While power switch is turned on Lower CPU provides High level from terminal POFF Being High of signal POFF turns the transistors on and VDD 5 9 V is provided to a power source terminal VDD2 Receiving scan signal KO18 from terminal KI6 the Lower CPU detects the OFF position of h Lower CPU then drops the voltage level of terminal POFF Low causing the transistors power switc to be turned off Since
3. jo oec APO Prohibition Upper Volume it 59V 5V 5V OV ee s La N TV M 100 107 4 74 nost abl vibrator Upper Tune E Sampling Circuit Line Line Lower Tune for Rhythm Tempo Our Our IL Phone p HN62404PD27 mr APO Prohibitvon C ARO AR17 ROM Upper Lower Mixer Ta Lower Volume Amp 144127 Uppers Lower Mixer RE lil Lower Ep 1001015 LC7880 DATA UPD938GD Reset IC 58053 ALR LRCK WELK BCLK KC4 X021 R7 UPPER CPU MSM6283 05GS Generates Pitch and Envelope Signals for Upper Keyboard Controls Keys Switches and Peripheral Devices The following table is the pin functions of the CPU Terminal Name Function 5V source for internal ADC Analog to Digital Converter Ground 0 source for internal Not used In Out Data bus 00 06 Chip enable signal for mamory devices LOW active A2 A10 A3 Address bus A2 A3 A10 20 29 4 9 11 14 30 A15 Output enable signal for memory devices LOW active Write enable signal for RAM LOW active Not used 5V source Not used No function Ground OV source for internal digital circuit Ground OV source for internal analog circuit Not used 7 277 MHz clock pulse input and output Power ON detection signal inp
4. w 8 NE ge 4 i 15 3 e Is t 7 qug eee i vu Ar 4 M gt e i p e Q eta mme e 16 Qu E ee mee i ceni S z 221 oe 5 4 f to H e Os en ba F 220 5 e Hiag Ed Mua OS 2 oe 4 e 5 gt gt etu 5 Oa s gt 2 sis ge m Gee WO ottw w zg P wenoe 7 H u 8 2 4 wA me c 512 Gs rr Qi 2 1 eet eS on TE 32 4 e it im fe fe i 1 2 11 i ae rr 11 ee ae ae 3e 3 1 ts je o 8 5 13 1 Fg s g em u 12 Oy Lu 3 o 9 fe 2 i q 9 ow zT in ue M4134 MAIM irec vom l4 12 MAJOR WAVEFORMS AC adaptor AC adaptor In Our DIL dene a Upper CPU Reset 74HC32 pin 11 2 Lower CPU Reset signal 8053ALR pin 1 EE cm 49 cua 39 kot PC Joiner 2 pin 1 PC Joiner JA2 pin 7 en nu nu Ow iY Od v Upper Filter input T9 Emitter Upper Filter output T8 Emitter Upper Tone Flute Key
5. 5 9 V is not provided from terminal VDD2 Lower CPU Stops functioning 23 KEY MATRIX The upper and the lower kays and switches are controlled by Upper and Lower CPUs separately Upper Keyboard KI7 UKI6 UKI K01 K02 UKOZ PIANO VIOLIN TRUMPET CLARINET GUITAR SAMPLE SAMPLE 1 3 SAMPUNG 24 Lower Keyboard SYNCHRO FILL IN INTRO ENDING BOSSA NOVA 1 WALTZ 16 BEAT SAMBA BRASS ENS FLUTE CHORUS PURCUS SION CHORD FING D 1 CHORD FING D 2 K020 ACCOMP ACCOMP ACCOMP ACCOMP ACCOMP VOLUME 0 VOLUME 1 VOLUME 2 VOLUME 3 VOLUME 4 ACCOMP ACCOMP ACCOMP ACCOMP ACCOMP VOLUME 0 VOLUME 1 VOLUME 2 VOLUME 3 VOLUME 4 25 POWER CIRCUIT 0 VOD 5 9 00 5 9v T pak 9 AVOD ISV an n 3S81257E F 90 00 isv 100K T2 4 Inverter 25013810 R wis A an nd AN ru 8 C50 16100 75C1740LNSA TP T 6 3V330y PCB M5161 SUBM 22 o1 The Power IC CA6722 provides DVDD 5 V for digital cir cuits AVDD 5 V for linear circuits and VOD 9 V for Power Ampl Since Lower CPU functions by 5 9V the VDD 5 9 V is provided from ext
6. A2 B3 Power ON 24 E D Upper CPU MI signal When Power ON csl cx Signal EH MSM6283 pin 89 Signal SH 5 6283 pin 93 Upper Tone Piano Lower MI 938 pin 6 Power ON DATA LC7880 pin 8 3BCK LC7880 pin 9 Oti10aY 2 0 DAC output LC7880 pin 1 B DAC output LC7880 pin 20 Tone FLUTE Key D Lower Key scan signal uPD938G pin 44 3 Lower Key scan signal KO19 yu PD938G pin 34 r 6 5 4 BLRCK LC7880 pin 6 8wck1 LC7880 pin 7 3 DAC output LC7880 pin 1 DAC output LC7880 pin 20 Tone PIANO Key ZU IPM output LC7880 pin 1 2 DAC output LC7880 pin 20 Tone STREET J See aG i AN i Lower filter output M5218PR 1 pin 1 Lower filter output M5218PR 2 pin 1 Tone PIANO Key CMi20av CM220ev 3 DAC output LC7880 pin 1 43 DAC output LC7880 pin 20 Tone SPACE WARS Lower filter output 5218 1 pin 1 8 Lower filter output M5218PR 2 pin 1 Tone FLUTE Key BLOCK _ tomos FC DIGRAM yPO23C2SG6E AC fA0 A15 V KI SH ct Puch 7S5 t6 Envelope 22 60 Mixer Ses ae 91 02 Upper pub PEO CA6722 CPU Va MSM6283 uPD43256C 121
7. be 5 V Lower CPU UPD938GD 001 Lower ROM HN62404PD27 DAC 1 7880 Pins 1 and 20 output waveforms Lower Filter Block No accompaniment Pin 11 waveform Lower ROM HN62404PD27 Lower CPU UPD938GD 001 in ki i Key Switch matrix Check for open circuit on or KO line do not function A certain key does not Key contact Dust on the contact function PARTS LIST DM 100 Notes 1 Prices and specifications are subject to change without prior notice As for spare parts order and supply refer to the GUIDE BOOK for Spare Parts Supply published separziely The numbers in item column correspond to the same numbers in drawing Notes DM 100 Parts List 20102247 20102394 20105040 20105474 20105635 21003549 21050035 21050798 21050812 21140007 21140070 21140252 21141176 21201146 22004409 22201425 22500126 22510273 22510287 22590147 22530154 23010241 23107848 23400022 23600903 23700133 23900112 23900378 25900483 26075035 26170028 26170036 26170052 26170061 26170087 21004740 1 4134 2M CN3M 557 LSI LSI si 181 LSI MOS IC C MOS IC C MOS IC C MOS IC C MOS IC Monolithic IC Monolithic IC Monolithic IC Monolithic IC Monolithic IC Transistor Transistor Digital transistor Traneistor Digital transistor Digital transistor Transistor Diode Zener diode Variable capacito
8. 0206 26170246 26170249 26170271 26170273 26170289 26170297 26170301 26170335 26170360 26170378 26170386 26170459 26170467 27850280 27706860 27709737 28017189 28017910 28018134 28018141 28045972 28053142 28053215 28070934 28070942 28071155 New paris Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon fiim resistor Cerbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resi Carbon film Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film ri Carbon film Carbon film resistor Carbon film resistor Slide VR VR Slide VR Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Electrolytic capacitor Q ty Quantity used per unit The minimum order and supply quantity Specification R 20 10K J T24 T R 20 47K J T24 T R 20 68K J T24 T R 20 82K J T24 T R 20 100K J T24 T R 20 150K J T24 T R 20 220K J T24 T A 20 1M J T24 T R 20 1 8K J T24 T R 20 470K J T24 T R 20 39K J T24 T R 20 12K J T24 T R 20 470 J T24 T R 20 5 6K J T24 T R 20 22 J T24 T R 20 15K J T24 T R 20 22K J T24 T R 20 56K J T24 T R 20 56 J T24 T R 20 1 5K J T24 T R 20 3
9. 134 2 23700133 37251358 5 4134 4 37251253 Diode LED PC joiner M134D PC joiner M134F ASS Y LED PC joiner M134 ASS Y PC joiner M134G 6 M322M KY1M ASS Y 23010241 37251267 Diode PC joiner M134A2 Notes New parte Q ty Quantity used per unit 2SC1740LNSR TP T 2SK163M T 2581357SSY2E F LTZ MR15T 77 T R 20 220K J T24 T R 20 1K J T24 T R 20 10 J T24 T V8K4 118100K 16RE2 10 T2 T 16RE2 100 T2 T 152473 77 275 2 JSF00 29 130M JSF00 8 130M LN27SRPX TT2 JSF00 17 40 15 00 8 120 1552547 77 T 15 00 12 110 minimum order supply quantity 33 8 Stock recommended O00000um p X No stock recommended DM 100 Parts List Parta Name Specification 7 M492M KY1M ASS Y 22010275 Diode 1SS176 TPA7 T 43075222 Blank PCB M492 KY1M M19718 1 8 UPPER CASE ASS Y 38310259 Speaker EAS 10P289F 37251232 PC joiner M134A1 JSF50 15 180M 69095880 SL contact 12S CSB 12S 69095890 SL contact 12D CSB 120 69142030 K rubber 253C M310205 1 69143820 Key top 134 set M310361 1 69143830 K rubber 134A M310311 1 69143840 K rubber 134B M410270 1 69143850 K rubber 134C M41027 1 1 69143860 Rubber button 134 M310312 1 69143880 Slide knob 90 M31032 23 69143890 Slide knob 90 M31032 24 69143900 Upper case sub ass y M210222 1
10. 9K J T24 T R 20 330 J T24 T R 20 27K J T24 T R 20 88 J T24 T EWA NAXCH1814 K121KO21B 100KB EWANFTCH1814 50RE2 R33 T 14 T 16RE3 470 T2 T 168 2 22 714 16RE 2200 S1 16RE2 100 T14 T 16RE2 10 T2 T 16RE2 47 T14 T 16RE2 220 T14 T 6 3RE2 220 T2 T SORE2 1 T14 T 31 2 Bom O gt m Unit Price O0000000000g mopgooooooonoaooonoooooonoooonononn A Essential B Stock recommended C Others X No stock recommended DM 100 Parts List Specification aw Price Rank Code Ceramic capacitor RT HE60TKCH430J T 1 00408SR 104K 16 T Item Code No 28130161 28130560 Semi conductive capacitor 28130609 Ceramic capacitor Li 28131148 Semi conductive capacitor 28131218 Semi conductive capacitor Semi conductive capacitor RT HESOTKCH131J T DD406SR473K16 F DD404SR222K16 T 28131225 DD404SR562K 16 T 28131260 Semi conductive DD404SR103K 16 F capacitor 28131267 Semi conductive capacitor DD404SR682K 16 F 28131274 Semi conductive DD405SR223K 18 F capacitor 28131281 Ceramic capacitor HE50TJCH330J 1 28131288 Ceramic capacitor HETOTJCH820J 1 28131295 Ceramic capacitor 121 1 28180365 Ceramic capaci
11. Service MaNuAL amp PARTS LIST ELECTRONIC KEYBOARD DIVI 1OQ CONTENTS Fiche Cell Page CIRCUIT DIAGRAM 1 4134 1 1 2 Upper Keyboard Block 2 PCBs M4134 MA1M 2 2 Lower Keyboard Block MA 3M M5161 SUBM 21 45 PCBs 4134 1 2 4 2 04 31 47 PCBs M4134 MA2M CN3M 4 M322 KY1M Upper 5 PCB M492M KY1M PCB VIEW amp MAJOR CHECKPOINTS MAJOR WAVEFORMS BLOCK DIAGRAM 11 A3 1 1 All PITCH ENVELOPE MIXER SAMPLING CIRCUIT LOWER CPU UPD938G PIN FUNCTIONS LINEAR CIRCUITS APO PROHIBITION CIRCUIT POWER ON OFF CIRCUIT KEY MATRIX POWER CIRCUIT LED DRIVING TROUBLESHOOTING PARTS anco ee P Oversized Schematic Diagram M4134 MAIM T 1 1213 344 nzvn reien 2 e 3 181201221 24 aad gt E Ld T 152 247 nil er gs ec cne ae LI LB 56 t va 2 n Sw MAR NR Oman 4134 irre sane Z SH pox Y 19 21 23 45 716 10 D t ne an 4 dpo E 1 if atong um 5 1127 z 5 ni
12. contains right and left channels sounds the voltage level of this signal determines the output channel of DAC High Left channel Low Right channel High level reference voltage for the built in ADCs Analog to Digital Converters Connected to DVDD 5 V 5 V power source for the built in AUCs Analog inputs for the built in ADCs Not used Ground for the built in ADCs Low level reference voltage for the built in ADCs 16 DAC Digital to Analog Converter LC7880 CPU UPD938G Data output from CPU is 16 bit serial signals containing digital sound data of melody chord bass and percussion for the right and the left channels LC7880 converts the 16 bit serial sound data into analog waveforms and outputs the right and the left channels waveforms separately CHI OUT VeelH Welt 2 OUT umng control Ts en test j TST OUT CH latch ask 16 LC7880 Block Diagram 17 1 Data reading Digital audio data is 16 bit serial signals of 2 s complement In accordance with the voltage level of terminal IF LC7880 is able to read either MSB first data or LSB first data Since the CPU s DATA output is MSB first data the terminal IF is connected to HIGH level Synchronized with the rising edge of BCLK digital audio signal from DATA terminal is stored in SIPO register At the falling edge of word clock WCLK1 the data is latched in either CH1 latc
13. ernal voltage regulator circuit When a part in the Power Circuit is replaced adjust the variable resistor VR2 so that VDD is 5 9 V When the keyboard is not played for more than six minutes both Upper and Lower CPUs provida APO signal to shut DVDD and AVDD off 26 LED DRIVING LED Latch Lower CPU 7 174 UPOS38G TONE MIX RHYTHM SELECT UPI Power VCC AD4 3 TROUBLESHOOTING No power Pilot lamp does Power IC CA8722 Pin 2 should be 9 V not tight Transistor T1 Collector should be 9 V Power jack Check for open circuit of power jack of poor soldering No sound at sil VDD Regulator TS collector should be 5 9 V Power 6722 Pin 6 voltage should be 5 V Upper or Lower CPU Either CPU may be providing APO signal to Ess or UPD938GD Power IC Power Amp LA4127 Upper keyboard no sound 1 Pins 63 and 64 of Upper CPU 5 6283 Upper Reset Circuit Transistor T15 Collector should provide a pulse SL at Power ON Upper CPU MSM6283 Upper ROM UPD23C256EAC Upper RAM 43256 121 Pitch Envelope Mixer Pins 1 8 11 18 should provide sound CA91A02 waveforms Upper Filter T8 emitter waveform Lower keyboard no sound PG2 Pin 105 waveform of Lower CPU UPO938GD Lower Reset IC S 8053 Pin 5 of Lower CPU UPD938 should receive Low level signal at battery or adaptor set Power OFF Circuit Collector of T21 should
14. h or CH2 Latch The channel selection is done by signal LRCK HIGH CH1 LOW CH2 2 D A conversion 9 VrelH CHIOUT CH2 OUT switching c ecun H VAL Upper Middle 4 bu 2 0015 08 07 04 Lower 4 bu 1015 081 LC7880 D A Conversion Block for One Channel LC7880 contains two each of R string DAC PWM Pulse Width Modulation DAC and Level Shift DAC for the right and the left channels After being latched 16 bit digital audio signal is separated in three blocks and each block data is Sent to 8 certain DAC Upper 8 bits 015 08 To R string DAC Middle 4 bits 07 04 To PWM DAC Lower 4 bits 03 00 To Level Shift DAC 18 R string DAC By means of connecting 258 29 pieces of unit resistors in serial voltages VH and VL applied to both ends of the resistors are divided in 256 steps Potontial difference at both ends of one unit resistor R is VH VL 256 The upper 8 bits of signal DATA turn the switches in switching circuit and extracts a voltage level 2 PWM Pulse Width Modulation DAC The potential difference V2 V1 of R string DAC is further divided in 16 steps in PWM DAC The division is controlled by the middle 4 bits 07 04 3 Level Shift DAC The resistances of variable resistors VRH and VRL are varied by the lower 4 bits of signal DATA 03 00 By means of varing the potential difference between VrefH and VrefL R string DAC s outp
15. may stop the oscillation use this terminal for checking 4 MHz clock pulse pins 13 and 14 Ground 0 V source 4 MHz clock pulse for rhythm tempo Not used 1 1 8 MIN 9 100 1015 Clock pulse for LED latch At the rising edge of this pulse LED date ARO AR17 is kept in the LED latch LED drive signal Keys and switches input terminals APO Auto Power Off signal output When the keyboard is left unoperated for six minutes the signal drops to LOW level shutting the voltages AVOD and DVDD off in the Power IC CA6722 By the time sharing these signals function as key and switch scanning and LED driving Data inputs from the ROM ROM s address bus Out ROM s out enable signal When LOW the ROM able to output data Check terminal for main clock Outputting 2 7156 MHz 1 8 of 21 7248 MHz pulse this terminal is used for checking the main clock pulse generator DAC s bit clock Timing pulse for writing serial digital audio date in DAC Provides one pulse per one bit of digital audio data SWD1 DATA Out Serial digital audio data By the time sharing this terminal provides 16 bit serial data for the right and the left channels tone percussion chord and bass sounds Word clock pulse for the DAC At the falling edge of this signal 16 bit serial sound da in the DAC Left Right channels separation signal the serial sound data
16. ovides sampling signals to the Vin terminal of the Upper CPU Resistors 100K ohm and 100 4 7 kohm bias the sampling signal on 2 863V When the sampling sound level exceeds 0 315V the CPU starts to transmit the sampling sound data to the RAMs during the following period While sampling the CPU transmits the sampling sound data to the sampling RAMs directly While sampling CPU does not output key common signals KO0 KO9 so that the keyboard becomes inoperative Sampled sounds are digitized in CPU and transmitted to the RAM 14 LOWER CPU UPD938G PIN FUNCTIONS RESET1 Function 5 9V power source for the LSI While power switch is turned the terminal receives 5 9V Power OFF signal output When power switch is OFF the terminal drops to low level turning externally connected transistors off to shut VODf2 pin 1 off CPU reset signal input are set or an AC adaptor is inserted the terminal CPU then initislizes its internal circuits Power ON triggers pulse input When the power switch is turned on the terminal receives differential pulse YT Receiving this signal the CPU starts functioning 13 14 MOSI MOSO 17 MOUT 21 7248 MHz clock pulse inpuVoutput Varing this frequency changes the tune pitch 5 9V power source No matter the power switch position the terminal always receives 5 9V 4 MHz clock pulse check terminal As direct touch of an oscilloscope probe
17. r Zener diode LED Vari capacitor Diode Ceramic oscillator Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Carbon film resistor Q ty Quantity used per unit The minimum order and supply quantity Specification MSM6283 05 UPD23C256EAC 029 MSM51257L 12 1585 HN62404PD027 UPD938GD 001 TC4066BP TC74HC32P 7 174 C7880 TC74HC123P 4558 44127 CA91A02 CA6722 M5218PR 25 933 5 2SC1740LNSA TP T 2SA1565 AC T 2SB1357E F 25 4049 DTC143XS TP T 25013814 R 155254 77 RD4 3ESB2 T1 T Svca21 RD4 7JSB3 T1 T LN275RPX SVC201SPA 1SRf139 100T 32 T EFO FC4006A3 ELRSOX 68 J T34V T R 20 100 J T24 T R 20 220 J T24 T R 20 1K J T24 T A 20 2 2K J T24 T R 20 4 7K J T24 7 30 o GA AN 5 SS 9 wA c Unit Price Rank Code BR AF AE AE AX AE AD AT AI AL AE AD AD AD AD AD AD AD AA AA AE AA AC AD AB AH N A N A N A N A N A Essential Stock recommended C Others X No stock recommended Notes DM 100 Parts List Code No 26170095 26170117 26170125 26170133 26170141 26170150 26170168 26170178 26170192 26170203 2617
18. tor RT HESOTKYB102K T 8 G 28180390 Ceramic capacitor RT HE40TKYB220K T 9 28180411 Ceramic capacitor RT HE40TKYB331K T 2 28181256 Ceramic capacitor RT HE40TKSL100D T 2 28182082 Ceramic capacitor 0 1032 20 bi 28183305 RT HESOTKCH270J T 1 c 28190557 Ceramic capacitor RT HESOTKSL 101K T 2 c 28306229 Mylar capacitor AMZV 104K50 T 2 28450021 Three polarity capacitor 05306 568222 6 30202147 Ferrite beads BLO2RN2 R62 10 AB 30250063 filter OST306 56FZ103Z 1 AC 34200050 Slide SW SSE 22FP AD B 35010070 DC jack 2305 01 030 AC B B 8 B B 8 A 35124365 Pin jsck 11 0098 2 36120665 Phone jack 21 5006 1 36120711 Miniature jack YKB21 5101 1 38410007 Coil L10P 7L 1 38410478 Coil L2P 7L 1 38501216 MOS IC 58053 1 Notes parts Rank A Essential Q ty Quantity used per unit B Stock recommended The minimum order and supply quantity C Others X No stock recommended an DM 100 2 M5161 SUB 22201425 22401068 22510301 23700119 26170036 26170052 26170265 27602231 28053142 28071082 Parts List Specification ee Transistor FET Transistor LED Carbon film resistor Carbon film resistor Carbon film resistor Semi fixed resistor Electrolytic capacitor Electrolytic capacitor 3 4134 ASS Y 23010101 23700133 37251239 37251248 4 4
19. ut HIGH active Receiving a pulse at Power ON CPU starts functioning Reset signal input HIGH active The terminal receives a pulse which resets CPU internal circuit when new batteries or AC adapter is set Not used Function ROM and RAM chip select signal Out APO Auto Power Off aignal out Terminal rises HIGH level to shut the voltages off when the unit is not operated for approximately six minutas KO11 KO0 Out Key common and LED drive signals outputs 11 18 Key input signals Not used PO1 PO3 Not used Envelope signals for upper voices Pitch signals for upper voices Not used source for DAC Digital to Analog Converter Ground 0 source for DAC Sampling sound input signal from MIC terminal PITCH ENVELOPE MIXER MSM6283 CA91A02 The upper keyboard is 4 note polyphonic Each voice s envelope and pitch signals are separately provided from the CPU Containing four mixing amp CA91402 merges the envelope and the pitch signals 14 SAMPLING CIRCUIT vc Internal MIC r External MIC 100 CPU Vin MSM6283 02GS MIC amp Line in circuit er 100 4 7 K vu Sample Sound Input Circuit SOOT Sampling Sound Input Signal 2872V Vin 2 557 1 gt 2 242V Time Sampling Start Vin Input Trigger Level The circuit pr
20. ut voltage for the minimum step is further controlled LC7880 Pin function Pin No Terminal Function 1 LOUT Channel 1 output Provides teft channel sounds 2 High level reference voltage Connected to AVDD 5 V 4 vec 5 V source 5 WCLK2 Not used Connected to AG 0 V 8 LRCK Lefvright channels separation signal As signal DATA contains both channels sounds the voltage level of this terminal separates the channels High Left channel Low Right channel 7 WCLK1 Word clock terminal 10 14 IF 15 GND 18 VrefL 17 GND 20 R OUT At the falling edge of this signal signal DATA is latched in either CH1 Latch or CH2 Latch 16 bit serial digital audio signal input Bit clock pulse terminal Timing pulse for reading DATA signal Also clock pulse for PWM DAC 5 V source LSB MSB first signal selection terminal Voltage level of this terminal determines tha format of signal DATA MSB first data LSB first data TA is MSB first on this model this terminal is connected to AVDD 5 V Ground 0V source Low level reference voltage Connected to AG 0V Ground 0V source Channel 2 output Provides right channel sounds 19 12 5 10 5 20 25 20 25 40 46 4812 5 10 ecu LACK J l CH D O CHD DATA TTT TTT
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