Casio_AT-1_Service_Manual电路图.pdf

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1、ELECTRIONIC KEYBOARD AT-1 (without price) RadioFans.CN 收音机爱 好者资料库 INDEX CONTENTS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Replacing the DSP (HG51B155FD) . . . . . . . . . . . . . . . . . . . . . . . . 2 Block Diagram . . . . . . . . . . . . .

2、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Major Waveforms . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . . . . . . . . . 13 PCB View and Major Check Points . . . . . . . . . . . . . . . . . . . . . . . 14 Schematic Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4、 . . . . 18 IC Lead Identification and Internal Diagram . . . . . . . . . . . . . . . . 19 Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 RadioFans.CN 收音机爱 好者资料库 1 General Number of Keys:61 Polyphonic:32-note Preset Tones:100 Tone Expander: Layer

5、, Split Keyboard Controls:Touch Response: On/Off Touch Sensitivity: Light/Middle/Heavy Key Transpose:Range from F# to F by a semitone increment Oriental Scale Control:Tune: On/Off, Mode: Cent/Koma Tuning Rang: Quarter tone (99 cents) and koma (5 komas) Scale Memories:4 Auto-Rhythms:50 Tempo Control:

6、 40 to 255 Auto-Accompaniment:CASIO Chord/Fingered/Full-Range Chord Controller: Variation, Fill-In, Intro/Ending Magical Presets:50;BREAK BEAT20 FREE SESSION24 KEY SPLIT 6 Digital Effects:10;Reverb-1, Reverb-2, Reverb-3, Chorus, Tremolo, Phase Shifter, Organ SP, Enhancer, Flanger, EQ Loudness Sound/

7、Control Pads:4 Pad Variations:32;Phrases: 10, Drums: 10, Percussion: 10, Controllers: 2 Song Memory:1;System: Real-time recording Memory Capacity: Approx. 700 notes Pitch Bender:Bend Range; 2 semitones/3 semitones Registration Memories:6 Registration Items:Tone Number, Rhythm Number, Tempo, Accompan

8、iment Mode, Accompaniment Volume, Effects, Layer On/Off, Split On/Off, Chord On/Off, Accompaniment Scale On/Off, Pad Variation, Assignable Jack, Auto-Accompaniment Controller, MIDI (Channel On/Off, GM On/Off, Local Control On/Off, Bend Range) Tuning Control:440Hz 50 cents Terminals:Headphone Jack Ou

9、tput Impedance: 150 , Output Voltage: 5.2 V(rms) MAX, Assignable Jack, MIDI Jacks (IN, OUT), AC Adaptor Jack (9 V) Built-In Speakers:12 cm dia. 2.5 W Input Rating: 2 pcs. Power Source:2-way AC or DC source AC: AC adaptor AD-5 DC: 6 D size dry batteries Battery life: Approx. 5 hours by manganese batt

10、eries R20P(SUM-1) Auto Power Off:Approximately 6 minutes after the last operation Power Consumption:7.7 W Dimensions (HWD):129 x 942 x 367 mm 5-1/16 x 37-1/16 x 14-7/16 inches Weight:5.3 kg (11.7 lbs) excluding batteries Standard Accessory:Music stand, Dust cover SPECIFICATIONS RadioFans.CN 收音机爱 好者资

11、料库 2 Electrical Current Drain with 9 V DC: No Sound Output260 mA 20% Maximum Volume930 mA 20% with key C3 pressed in Synth-Bass tone and effect No. E-9 Split: On, Layer: On, Oriental scale: On/Cent Song memory: Play, Volume; maximum, Touch: maximum Line Output Level (Vrms with 47 K load each cannel)

12、: with key F2 pressed in FSynth-Bass tone2480 mV 20% Phone Output Level (Vrms with 8 load each channel): with key C3 pressed in FSynth-Bass tone97 mV 20% Speaker Input Level: with key C3 pressed in FSynth-Bass tone2240 mV 20% Minimum Operating Voltage: 6.3 V REPLACING THE DSP (HG51B155FD) Note: To i

13、ncrease productivity ,the DSP HG51B155FD is sticked on the main PCB with a double-side adhesive tape, then its leads are soldered. Remove the DSP according to the following procedures. 1. Prepare isopropyl alcohol and a flat IC desoldering machine (Spot Heater HS-600). 2. Apply plenty of the alcohol

14、 to the adhesive tape from the reverse side of the main PCB. (Fig.1) There is a hole on the PCB just under the LSI, and the adhesive tape can be seen through the hole. 3. Leave it more than one minute so that the alcohol weaken adhesive power fully. 4. Using a proper size of nozzle, apply heat to le

15、ads of the LSI with the desoldering machine. 5. Grasp the LSI with tweezers, and using gentle force vibrate the tweezers to feel melting solder. (Fig.2) 6. Remove the LSI after meltingsolder at every leads wholly. Alcohl Spot Heater HS-600 Fig.2Fig.1 HG51A115A LSI-S 3 BLOCK DIAGRAM KC0 KC7 SI0 SI7 F

16、I0 FI7 Key Touch LSI LSI106 HG52E35P Working Strage RAM (64K-bit) LSI104 SRM2264LC90,10 7-Seg. LED LO0 LO4 LED driver IC301/302 BA612 LD0 LD7 Buttons KI1 KI7 VDD Power Switch MIDI IN OUT EA0 EA12 ED0 ED7 DSP LSI105 HG51B155FD RA0 RA19 RD0 RD15 Sound Source ROM (16M-bit) LSI103 TC5316200CP-C106 WCK1

17、SLOP BCK D/A Converter LSI101 UPD6376CX Filter IC105 Main Volume Power Amplifier IC102 LA4598 CPU LSI102 HD6433298A36P Keyboard A0 A14 POWER Power Supply Circuit IC101, Q1 Q4 VCCAVDDVDD LVDD DVDD VC APO Effect RAM (64K-bit) LSI107 SRM2264LC90,10 D0D7 Speakers Output A0 A12 A0 A3 A0 A2 LEDs LED drive

18、r Q109 Q116 KO Signal Generator IC303/304 TC74HC174P La Lg, Lp Reset IC IC104 RE5VA35AA RESET KO CLK KO0 KO10 LC1 LC4 Filter IC105 4 Note: Each key has two contacts, the first conatct 1 and second contact 2 . CIRCUIT DESCRIPTION Key Matrix Key Second contact 2First contact 1 FI KC SI F#3 G#3 A#3C#4

19、D#4F#4 G#4 A#4 C#5 D#5F#5G#5 A#5 F3G3A3B3C4D4E4F4G4A4B4C5D5E5F5G5A5B5C6 D#3 C2D2E2F2G2A2B2C3D3E3B6A6G6F6E6D6C7 C#3A#2G#2F#2D#2C#2A#6G#6F#6D#6C#6 Nomenclature of Keys KC0KC1KC2KC3KC4KC5KC6KC7 FI0C21C#21D21D#21E21F21F#21G21 SI0C22C#22D22D#22E22F22F#22G22 FI1G#21A21A#21B21C31C#31D31D#31 SI1G#22A22A#22B

20、22C32C#32D32D#32 FI2E31F31F#31G31G#31A31A#31B31 SI2E32F32F#32G32G#32A32A#32B32 FI3C41C#41D41D#41E41F41F#41G41 SI3C42C#42D42D#42E42F42F#42G42 FI4C41C#41D41D#41E41F41F#41G41 SI4C42C#42D42D#42E42F42F#42G42 FI5E51F51F#51G51G#51A51A#51B51 SI5E52F52F#52G52G#52A52A#52B52 FI6C61C#61D61D#61E61F61F#61G61 SI6C

21、62C#62D62D#62E62F62F#62G62 FI7G#61A61A#61B61C71 SI7G#62A62A#62B62C72 5 Button Matrix Reset Circuit Initial reset When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes its internal circuit and clears the working strage RAM. Power

22、ON reset When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU provides APO signal to the power supply circuit, then provides RESET signal to the DSP, the key touch LSI and the KO signal generators. VDD Battery set RESET CPU LSI102 HD6433298A36P Reset IC IC104 RE5VA

23、35AA Working Strage RAM LSI104 SRM2264LC90,10 DSP LSI105 HG51B155FD Key Touch LSI LSI106 HG52E35 DVDD DVDD DVDD VDD VDD -RESET POWER From power switch KO Signal Generator IC303/304 TC74HC174P -NMI KI1KI2KI3KI4KI5KI6KI7 KO0Registration3210 KO1ControlDemoLayerSplit KO2ToneRhythm987+ KO3Accomp654- KO4G

24、# downA downA# downB downG down KO5ScaleModeScaleTuneB upA# upA upG# upG up KO6IntroStart/Stop KO7C upC# upD upD# upE upF upF# up KO8C downC# downD downD# downE downF downF# down KO9ModePad BPad DPad APad C KO10Rec Song Memory Touch Response Transpose/ Tune Magical Preset Digital Effect Tempo Down T

25、empo Up Synchro/ Ending Variation/ Fill-In Normal/ Fill-In Scale Memory 1 Scale Memory 2 Scale Memory 3 Scale Memory 4 6 CPU (HD6433298A36P) The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and serial interfaces. The CPU accesses to the working strage RAM,

26、 the DSP and the key touch LSI. The CPU also controls buttons, bender input, LEDs and MIDI input/output. The following table shows the pin functions of the CPU. Digital Signal Processor (HG51B155FD) Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sou

27、nd source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides 16-bit serial signals containing data of the melody, chord, bass, and percussion to the DAC. The DSP also adds the selected effect to the sound data usi

28、ng a 64k-bit RAM. The following table shows the pin functions of the DSP. Pin No.TerminalIn/OutFunction 1P40OutKO signal data output 2P41OutClock for KO signal data 3P42OutAPO (Auto Power Off) signal output. ON: High OFF: Low 4P43OutRead enable signal output 5P44OutWrite enable signal output 6P45Not

29、 used 7P46Out10 MHz clock output 8P47InWait signal input. Connected to +5 V. 9TXDOutMIDI signal output 10RXDInMIDI signal input 11P52OutReset signal output 12-RESETInReset signal input 13-NMIInPower ON signal input 14VCCIn+5 V source 15-STBYInStandby signal input. Connected to +5 V. 16VSSInGround (0

30、 V) source 17, 18XTAL,EXTALIn20 MHz clock input 19, 20MD1, MD0InMode selection input.(Internal ROM mode - MD1: High MD0: Low) 21AVSSInGround (0 V) source for the built-in DAC 22AN0InAnalog input. Connected to ground. 23 29P71 P77InTernimal for button input signal 30AVCCIn+5 V source for the built-in

31、 DAC 31 38P60 P67OutLED segment signal output 39VCCIn+5 V source 40P27Not used 41 56P26 P10OutAddress bus 48VSSInGround (0 V) source 57 64P30 P37In/OutData bus 7 Pin No.TerminalIn/OutFunction 1 8CD0 CD7In/OutData bus 9, 10Not used 11GND7InGround (0 V) source 12CK16Out16.384 MHz clock output 13VCC6In

32、+5 V source 14CK0InClock input. Connected to terminal CK16. 15TCKBNot used 16VCC1In+5 V source 17GND1InGround (0 V) source 18, 19XT0, XT1In/Out16.384 MHz clock input/output. Connected to a crystal oscillator. 20SGLInSystem control terminal. Single chip system: Open 21CCSBInChip select signal input 2

33、2 25CA0 CA3InAddress bus 26CE0InNot used. Connected to ground. 27CWRBInWrite enable signal 28CRDBInRead enable signal 29 32Not used 33RESBInReset signal input 34TESBInNot used. Connected to +5 V. 35 39Not used 40 49 52 57 50VCC2+5 V source 51GND2Ground (0 V) source 58RA23OutNot used 59RA22OutChip se

34、lect signal for the sound source ROM 60, 61RA20, RA21OutNot used 62 73 75 82 74GND5InGround (0 V) source 83WOK2OutWord clock output. Not used. 84VCC3In+5 V source 85GND3InGround (0 V) source 86WOK1OutWord clock for the DAC 87SOLMOutSerial data output. Not used. 88SOLPOutSerial sound data output for

35、the DAC 89BOKOutBit clock output for the DAC 90 92Not used 93VCC5In+5 V source 94EA14OutNot used 95, 97 99 105 107, 109 110, 112 RD0 RD15InAddress bus for the sound source ROM RA0 RA19OutAddress bus for the sound source ROM EA0 EA12OutAddress bus for the effect RAM 8 DAC (UPD6376CX) UPD6376CX is a t

36、wo-channel 16-bit Digital to Analog Convertor consisting of resistor string, output amplifier and zero offset circuit. Key Touch LSI (HG52E35P) By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key touch LSI detects key velocity of 256-step. Then th

37、e LSI sends the CPU the note number and its velocity data. CRDB CWRB CKI CCSB RESB CD0 CD7 CA0 CA2 First contact Second contact KC0 KC7 FI0 FI7 SI0 SI7 Key input signal Key scan signal Data bus Address bus Key touch LSI LSI106 HG52E35P Keyboard FI SI KC RD WR APO A12 A14 CLOCK RESET Pin No.TerminalI

38、n/OutFunction 1SELInMode selection terminal. Connected to ground. 2D.GNDInGround (0 V) source for internal digital circuit 3NCNot used 4DVDDIn+5 V source for internal digital circuit 5A.GNDInGround (0 V) source for internal analog circuit 6R.OUTOutRight channel sound waveform output 7A.VDDIn+5 V sou

39、rce for internal analog circuit 8A.VDDIn+5 V source for internal analog circuit 9R.REFInReference voltage terminal. Connected to a capacitor. 10L.REFInReference voltage terminal. Connected to a capacitor. 11L.OUTOutLeft channel sound waveform output 12A.GNDInGround (0 V) source for internal analog c

40、ircuit 13LRCKInWord clock (L/R separation signal) input. 14LRSELInNot used. Connected to ground. 15SIInSound data input 16CLKInBit clock input 9 Block diagram of DSP and DAC circuit DSP LSI105 HG51B155FD Effect RAM (64K-bit) LSI107 SRM2264LC90,10 Sound Source ROM LSI103 TC5316200CP-C106 CEA0 A19D0 D

41、15 RA0 RA19 RD0 RD15 RA22 D0 D7 A0 A3 A13 A14 RD WR RESET SOLP BOK WOK1 EA0 EA12 ED0 ED15 CS WEOE D0 D15A0 A12 ECEB EOEB EWEB PG X102 16.384MHz DAC LSI101 UPD6376CX LOUT ROUT SOLP: Sound data BOK: Bit clock WOK1: Word clock SI CLK LRCK APO CCSB CRDB CWRB Pin No.TerminalIn/OutFunction 96EWEBOutWrite

42、enable signal output for the effect RAM 98EA13OutNot used 106EOEBOutRead enable signal output for the effect RAM 108VCC7In+5 V source 111ECEBOutChip select signal output for the effect RAM 113 117Not used 118VCC4In+5 V source 119GND4InGround (0 V) source 120 122Not sued 123 130ED0 ED7In/OutData bus

43、for the effect RAM 131GND5InGround (0 V) source 132 134Not used. Connected to ground. 135, 136Not used 10 The following table shows the pin functions of the key touch LSI. Filter Block Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms. AVDD

44、 1K1K1K C222(H) C103(H) AGAG 1K AG To main volume - + IC105 M5218APR 10V22 C333(H) Q107/108 2SC1740 18K AVEE 50V1 From the DAC Pin No.TerminalIn/OutFunction 1REQBOutInterrupt request. Not used. FI8 FI10 SI8 SI10 4VCCIn+5 V source 5CRDBInRead enable signal 6CWRBInWrite enable signal 7CCBBInChip selec

45、t signal 8, 9, 11T, STBY, WInNot used. Connected to +5 V. 10RESBInReset signal 12CKIIn10 MHz clock input 13, 14TMD, TSTInNot used. Connected to ground. 15CKOOutNot used 16GNDInGround (0 V) source 17XINInNot used. Connected to ground. 18XOUTOutNot used 19TRESInNot used. Connected to ground. 20 23, 25

46、 28CD0 CD7In/OutData bus 24GNDInGround (0 V) source 29 31CR0 CR2InAddress bus 32VCCIn+5 V source 33 39, 41 43FI0 FI7, 53 55, 57 59SI0 SI7 40VCCIn +5 V source 44 47, 49 52KC0 KC7Out Key scan signal 48, 56GNDIn Ground (0 V) source 64VCCIn +5 V source InKey input signal. Connected to + 5 V.2, 3, 60 63

47、InKey input signal 11 Power Amplifier (LA4598) The power amplifier is a two-channel amplifier with standby switch. The following figure shows the inter- nal diagram of the amplifier. Internal Diagram of LA4598 6 5 8 7 10 11 13 12 9 4 1 3 2 Input Amp. Pre-drive Amp. Power Amp. TSD protector Stand by

48、Bias circuit Input Amp. Pre-drive Amp. Power Amp. Ch1 IN Ch1 N.F. Pre GND D.C. Ch2 IN Ch2 N.F. Ch2 B.S. Ch1 OUT Power GND VCC Standby Ch2 OUT Ch2 B.S. Power Supply Circuit The power supply circuit generates six voltages as shown in the following table. VDD voltage is always generated. The others are

49、 controlled by APO signal output from the CPU. NameVoltageFor operation of VDD+5 VCPU, Reset IC, Working strage RAM DVDD+5 VDSP, Key controller, Sound source ROM, Effect RAM, DAC, KO siginal generator AVDD+5 VDAC Filter LVDD+4.5 VLED Driver VCC+9 VPilot lamp VC+9 VPower amplifier 12 M617T-KY2M M617T-KY1M JB1 JB2 JB3 JB4 JB5 JB6 JB7 JB8 JB9 JB10 JB11 JB12 JB13 JB14 JB15 JB16 JG1 JG2 JG3 JG4 JG5 JG6 JG7 JG8 JG9 JG10 JG11 JG12 JG1 JG2 JG3 JG4 JG5 JG6 JG7 JG8 J