Casio LK-127 Service Manual & Parts Manual Download Page 20 | Manualshive

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LK-127

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Test Procedure

A. Mode Switch Check

A-1. Switch the mode switch and then check that the following screen appears.

Mode Switch

LCD

FINGERED

CASIO CHORD

NORMAL

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Summary of Contents for LK-127

Page 1: ...LK 127 MAR 2013...

Page 2: ...CONTENTS SPECIFICATIONS 1 BLOCK AND WIRING DIAGRAM 2 PCB INFORMATION 3 CIRCUIT DESCRIPTION 4 PRINTED CIRCUIT BOARDS 5 DISASSEMBLY 7 DIAGNOSTIC PROGRAM 16 EXPLODED VIEW 22 PARTS LIST 23 SCHEMATIC DIAGR...

Page 3: ...chord name fingering timing indicator key lighting voice fingering Other Functions Transpose F to C to F half note Tuning Adjustable A4 Approx 440 Hz 50 cents Initial value A4 Approx 440 Hz Speakers...

Page 4: ...N3 17 pin CN201 17 pin CN205 CN206 CN207 CN6 CN8 CN204 LSP LSP CN9 CN7 CN4 CN5 RSP RSP CN803 16 pin CN801 13 pin CN802 13 pin CN1 16 pin CN2 16 pin CN506 16 pin CN503 12 pin CN504 6 pin CN504 6 pin CN...

Page 5: ...Keyboard LED controller Reset IC Buttons Right speaker POWER AMP PCB PCB UNIT POWER AMP MX820 PSA1 Power supply circuit Power amplifier Power switch Volume Buttons DC 9 5 V jack Left speaker PHONES OU...

Page 6: ...B4 C5 C5 D5 D5 KI5 E5 F5 F5 G5 G5 A5 A5 B5 KI6 C6 C6 D6 D6 E6 F6 F6 G6 KI7 G6 A6 A6 B6 C7 Button Matrix KO8S KO9S KO10S KO11S KI0S 0 5 TONE STEP 1 KI1S 1 6 RHYTHM STEP 2 KI2S 2 7 SONG BANK STEP 3 KI3...

Page 7: ...LK 127 5 PRINTED CIRCUIT BOARDS MAIN PCB M821 MDA1 POWER AMP PCB M820 PSA1...

Page 8: ...LK 127 6 KEYBOARD PCB M800 KYA1 KEYBOARD PCB M800 KYA2 KEYBOARD LED PCB M821 LDA1 KEYBOARD LED PCB M821 LDA2...

Page 9: ...screw remove it Be sure to reattach the screw cap when assembling Check how cables are wired before removing cables Be sure to wire the cables in the same manner as they were before disassembly In cas...

Page 10: ...the main unit A 2 When replacing the keyboard LED PCB undo 16 screws and then remove the LOWER COVER LOWER COVER C LOWER COVER B LOWER COVER A Notes on Assembly To install the LOWER COVER tighten the...

Page 11: ...urn over the panel unit A 4 Unsolder two battery lead wires and two ribbon cables Lead wire Red Lead wire Black Ribbon cable KYA2 PCB Ribbon cable LDA2 PCB A 5 Remove the panel unit PCB UNIT MAIN PCB...

Page 12: ...A2 PCB B 2 Unsolder two lead wires and one ribbon cable Lead wire White Lead wire Blue Ribbon cable PSA1 PCB B 3 Unsolder two lead wires from the right speaker Lead wire White Lead wire Blue B 4 Undo...

Page 13: ...ht If not tighten correctly it may cause the LCD display errors 4 3 2 1 5 6 MDA1 PCB C Remove the PCB UNIT POWER AMP C 1 Unsolder two lead wires and one ribbon cable from the MDA1 PCB Lead wire White...

Page 14: ...AMP two RUBBER KEY and two CONTACT SLIDE SWITCH RUBBER KEY CONTACT SLIDE SWITCH D Remove the SPEAKER D 1 Unsolder two lead wires D 2 Undo four screws and then remove the SPEAKER Left speaker Right spe...

Page 15: ...LK 127 13 E KEY E 1 Undo eight screws and then remove two SIDE PANEL SIDE PANEL LEFT SIDE PANEL RIGHT E 2 Undo 21 screws and then remove the KEY...

Page 16: ...e RUBBER CONTACT NOTE The RUBBER CONTACT CS differs from the others in length RUBBER CONTACT CS RUBBER CONTACT CB How to Install RUBBER CONTACT Lightly insert the tip of a RUBBER CONTACT into the PCB...

Page 17: ...over the PCB UNIT LDA NOTE Do not touch the LEDs NOTE After repairing arrange the ribbon cables again G 3 Unsolder three ribbon cables from the LDA1 and LDA2 PCB G 4 Undo 12 screws on the LD3 LD4 and...

Page 18: ...with enough capacity 2 Adjust the main volume so that it is at about 1 3 of the full volume How to Start the Diagnostic Program 1 Hold down the 0 and START STOP buttons at the same time to turn the po...

Page 19: ...te A Mode Switch Check B Button Check 0 C ROM Version Check 1 D Keyboard LED Check TONE E LCD Check STEP 1 F Auto Power OFF Check PART SELECT This diagnostic program does not test the following items...

Page 20: ...LK 127 18 Test Procedure A Mode Switch Check A 1 Switch the mode switch and then check that the following screen appears Mode Switch LCD FINGERED CASIO CHORD NORMAL...

Page 21: ...nd the button number and OK appear If the result fails NG If there is a button failure or the buttons are pressed in a wrong sequence the error tone sounds and the number of the button which you press...

Page 22: ...mbers shown in the figure below There should be no key of which LED brightness is too bright or too faint 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 E LCD Check E 1 Press the STEP 1 button to per...

Page 23: ...The pitch of the sound corresponding to a key is correct Hitting a key does not produce two tones or make sounds twice The stroke and the load of keys are normal The difference in height and the gap...

Page 24: ...r notice 2 Refer to the latest Parts Price Code at PARTS FINDER on the Casio Service WEB site https www servicecasio com 3 As for spare parts order and supply refer to the GUIDEBOOK for Spare Parts Su...

Page 25: ...LK 127 22 EXPLODED VIEW 17 33 30 31 18 28 27 26 25 24 22 21 20 23 19 29 2 32 34 35 37 44 45 46 47 38 39 43 43 40 42 41 38 36 6 8 9 10 7 11 12 14 16 4 48 3 13 1 30 15 5 5...

Page 26: ...NCP18XH103J03RB 1 1 1 X X1 10070555 RESONATOR CSTCW20M0X51 R0 1 1 1 X POWER AMP PCB 2 10368211 PCB UNIT POWER AMP TK RJM510421 001 1 1 1 C PSA1 CN205 CN206 10178633 WIRE BLUE 1007TASC24100B4040 2 2 2...

Page 27: ...7 5 90 8 8 8 X N 10 10453357 PCB UNIT LD5 TK M240430 012 1 1 1 C LD5 for Black key LED467 LED475 10302396 LED 1154SURDKB5 7 5 90 9 9 9 X KEYBOARD UNIT 11 10304700 WHITE KEY CB TK RJM507243 003 4 4 4 C...

Page 28: ...35 10301471 FELT LOWER LIMIT KEYBOARD RJM508593 001V01 1 1 1 X 36 10317116 FELT DAMPER KEYBOARD RJM509138 001V01 1 1 1 X 37 10205015 FELT UPPER LIMIT KEYBOARD M440342 001V02 1 1 1 X 38 10284332 BRACK...

Page 29: ...LK 127 27 SCHEMATIC DIAGRAMS MAIN PCB M821 MDA1 to KYA2 CN803 to LDA2 CN506 to PSA1 CN206 to PSA1 CN207 RIGHT SPEAKER to RIGHT SPEAKER to PSA1CN201 Not used...

Page 30: ...28 POWER AMP PCB M820 PSA1 to BATTERY to LEFT SPEAKER to KYA2 CN803 to MDA1 CN3 POWER MODE SWITCH SW201 VOLUME SW202 LEFT SPEAKER BATTERY DC 9 V IN J201 PHONES OUTPUT J202 to MDA1 CN7 to MDA1 CN6 Not...

Page 31: ...LK 127 29 KEYBOARD PCB M800 KYA1 KYA2 to KYA2 CN802 to KYA1 CN801 to MDA1 CN1 Not used Not used...

Page 32: ...LK 127 30 KEYBOARD LED PCB M821 LDA1 to LDA2 CN503 to LD3M JG...

Page 33: ...LK 127 31 KEYBOARD LED PCB M821 LDA2 to MDA1 CN2 to LD5M JE to LD4M JF to LDA1 CN501...

Page 34: ...LK 127 32 KEYBOARD LED PCB CSM446 LD3M LD4M LD5M to LDA1 CN502 to LDA2 CN504 to LDA2 CN505...

Page 35: ...CASIO COMPUTER CO LTD CS Technical Department TOKYO JAPAN...

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