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Casio CTK-485, Service Manual

The Casio CTK-485 is a versatile keyboard that offers a wide range of features for musicians of all skill levels. For troubleshooting and maintenance, make sure to download the free Service Manual from manualshive.com. This manual includes detailed instructions on how to use and care for your keyboard effectively.

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SCHEMATIC DIAGRAMS

Main PCB JCM450-MA1M

1

2

7

5

3

4

Summary of Contents for CTK-485

Page 1: ...ARNAVAL DES ANIMAUX 71 SWAN LAKE 72 MARCH THE NUTCRACKER 73 BRINDISI LA TRAVIATA 74 TRIUMPHAL MARCH AIDA 75 LA DONNA MOBILE 76 TOY SYMPHONY 69 AIR SUITE no 3 77 SERENADE EINE KLEINE NACHTMUSIK 78 CHAN...

Page 2: ...ely 440 Hz 50 cents Volume 0 to 9 10 steps Terminals Phones output terminal Stereo standard jack Output Impedance 70 Output Voltage 2 4 V RMS MAX Power supply terminal 9 V DC Power supply Dual power s...

Page 3: ...o G2 pressed in Synth Lead 1 Volume maximum Speaker output level Vrms with 40 load each channel with key A1 pressed in Synth Lead 1 L ch 1 260 mV 20 R ch 1 200 mV 20 Phone output level Vrms with 8 loa...

Page 4: ...Power Switch Oscillator X1 Q1 Power Supply Circuit Q101 Q104 D205 Power Amp LA4598 IC101 Filter L Q106 Filter R Q107 Phones Output Speaker L Speaker R VC VCC DVDD AVDD APO MD0 MD7 MA0 MA18 DC 9 V IN D...

Page 5: ...KI1 KI2 KI3 KI4 KI5 KI6 KI7 KO0 C1 G 1 E2 C3 G 3 E4 C5 G 5 KO1 C 1 A1 F2 C 3 A3 F4 C 5 A5 KO2 D1 A 1 F 2 D3 A 3 F 4 D5 A 5 KO3 D 1 B1 G2 D 3 B3 G4 D 5 B5 KO4 E1 C2 G 2 E3 C4 G 4 E5 C6 KO5 F1 C 2 A2 F...

Page 6: ...STB In Reset signal input 36 37 P24 RXD P25 TXD Not used 38 NMI In Power ON signal input Connected to 5 V 39 APO Out APO Auto Power Off signal output 40 NC4 Not used 41 REFH Out Terminal for the inter...

Page 7: ...D driver 91 95 P73 P77 Not used 96 LGND In Ground source 97 100 MA18 MA15 Out Address bus Pin No Terminal In Out Function 1 22 63 80 23 VSS GND 0 V source Terminals for the built in clock pulse genera...

Page 8: ...in No Terminal In Out Function 1 Power GND In Ground 0 V source 2 Ch1 B S Terminal for a bootstrap capacitor 3 Ch1 OUT Out Channel 1 output 4 VCC In 9 V source 5 Ch1 N F In Negative feedback input 6 C...

Page 9: ...lty Block Power supply circuit Power switch Power jack J101 Power Amp IC101 LA4596 CPU LSI1 MSM6755B 17 Oscillator Key and switch matrix CPU LSI1 MSM6755B 17 Key and switch matrix Cause Remedy Faulty...

Page 10: ...tage setting Watching the LCD at a 41 20 angle to the horizontal adjust Vop voltage so that unenergized segments are seen dimly Output Set Voltmeter TP2 41 20 LCD Eye Input Connection Input Point Inpu...

Page 11: ...755B 17 pin 73 3 4 1ms CH2 CH1 BWL CH1 1V 1V CH2 5 Sound signal output L ch MSM6755B 17 pin 47 6 Sound signal output L ch Q106 2SC1740SQ Emitter 5 6 1ms CH1 CH2 BWL CH1 1V CH2 1V 1ms CH1 CH2 BWL CH1 1...

Page 12: ...11 PRINTED CIRCUIT BOARDS Main PCB JCM450 MA1M Top View Bottom View 1 2 7 5 3 4...

Page 13: ...12 Keyboard PCB KDM6111K KY1M Keyboard PCB KDM6111K KY2M Main PCB JCM450 MA2M 6 8 9 10...

Page 14: ...13 SCHEMATIC DIAGRAMS Main PCB JCM450 MA1M 1 2 7 5 3 4...

Page 15: ...14 Main PCB JCM450 MA2M 8 6 9 10 2 9 V 5 3 V 0 7 V...

Page 16: ...15 Keyboard PCBs KDM6111K KY1M KY2M Notes 1 All capacitance values are indicated in F p 10 6 F 2 All resistance values are indicated in k 103 M 106...

Page 17: ...16 EXPLODED VIEW 13 14 9 8 6 15 18 5 12 4 17 6 1 19 10 11 3 2 7 16 R 1 R 2 R 4 R 5 R 6 R 3 R 6 R 5...

Page 18: ...r spare parts department if you need these parts for refurbish 1 Prices and specifications are subject to change with out prior notice 2 As for spare parts order and supply refer to the GUIDEBOOK for...

Page 19: ...TOR 2SB1237TV2R 1 B Q2 2250 1162 TRANSISTOR 2SA1576AT106R 1 B VR1 2775 0994 VOLUME SEMI FIXED EVND8AA03B53 1 C X1 2590 2741 OSCILLATOR CERAMIC CSACV20 00MXJ040 TC 1 C Console PCB ass y 3 6925 1310 PCB...

Page 20: ...CASIO TECHNO CO LTD Overseas Service Division 8 11 10 Nishi Shinjuku Shinjuku ku Tokyo 160 0023 Japan...

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