Casio CTK-220L Service Manual
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Casio CTK-220L Service Manual

Casio CTK-220L Service Manual

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CTK-220L
POWER/MODE
VOLUME SYNCHRO/
START/
TEMPO
0
1
2
¢
FILL-IN
STOP
¢
FINGERED
ON
CASIO CHORD
NORMAL
OFF
5
6
7
TRANSPOSE/TUNE
ELECTRONIC KEYBOARD
100 TONES
SONG
3
4
TONE
BANK
STEP 1 STEP 2 STEP 3
DEMO
8
9
RHYTHM
PART
SELECT
25 RHYTHMS
20 SONG BANK
MULTI FUNCTION DISPLAY
20 SONG BANK KEYBOARD
TONE
RHYTHM
SONG BANK
CTK-220L

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Summary of Contents for Casio CTK-220L

  • Page 1 CTK-220L 100 TONES 25 RHYTHMS 20 SONG BANK POWER/MODE VOLUME SYNCHRO/ START/ TEMPO SONG TONE ¢ FILL-IN STOP ¢ BANK STEP 1 STEP 2 STEP 3 DEMO MULTI FUNCTION DISPLAY 20 SONG BANK KEYBOARD FINGERED CASIO CHORD NORMAL RHYTHM PART...

  • Page 2: Table Of Contents

    CONTENTS Page Specifications ........................... 1 Block Diagram ..........................2 Circuit Description ..........................3 Major Waveforms ..........................6 Printed Circuit Boards ........................7 Schematic Diagrams ........................8 Exploded View ..........................14 Parts List ............................15...

  • Page 3: Specifications

    F# ~ C ~ F: half-note Auto-rhythms: 25, Tempo: Adjustable, 216 steps (40 ~ 255), initial value: 120 Accompaniment: CASIO Chord, Fingered, Fill-in pattern, Synchro start Song bank: 20-tune Digital volume control: 10 steps (0 ~ 9), initial value: 7 440 Hz ±...

  • Page 4: Block Diagram

    BLOCK DIAGRAM 7 seg. LED LED Latch IC2, IC3 MD0 ~ MD7 Phone/Output KO8 ~ KO11 Buttons Amp. IC301 LA4598 Filter Q305 KI0 ~ KI7 LSI1 MSM 6755B-13 KO0 ~ KO7 Illuminant Keyboard LX0 ~ Power Supply Circuit LED Driver DC+9 V IN Q301 ~ Q304 Q5 ~ Q8...

  • Page 5: Circuit Description

    Volume Synchro/ Down Down Fill-In Song Part Tone Rhythm One Key One Key Demo Bank Select Casio Step-1 Step-2 Step-3 Fingered Normal Chord LED MATRIX NOMENCLATURE OF KEYS C#2 D#2 F#2 G#2 A#2 C#3 D#3 F#3 G#3 A#3 C#4 D#4...
  • Page 6 CPU (LSI1: MSM6755B-13) The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides a sound waveform in accordance with the pressed key and the selected tone. The CPU also controls key input, button input and LED driving.
  • Page 7 FILTER BLOCK Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform. Amp. Filter Block IC301 Q305 LSI1 POWER AMPLIFIER (IC301: LA4598) The power amplifier is a two-channel amplifier with standby switch. The following table shows the pin function of IC301.

  • Page 8: Major Waveforms

    MAJOR WAVEFORMS 1 APO signal 3 Clock MSM6755B-13 pin 39 MSM6755B-13 pin 32 2 Reset signal RH5VL40AA pin 1 4 Sound signal 5 LED drive signal LX0 JH connector pin 2 MSM6755B-13 pin 88 6 LED drive signal LY1 MSM6755B-13 pin 81 Tone: Whistle (59) Key: D4 Key : A4...

  • Page 9: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS Sub PCB KDM445-MA2M J301 J302 C356 C355 Q312 R366 C373 R371 C368 R374 R372 Q310 D331 C339 R309 R348 C372 R343 R310 C359 C337 C364 D333 AVDD R327 DVDD R320 D332 R324 LVDD R318 R302 Top view Main PCB JCM446-MA1M Bottom view Top view...

  • Page 10: Schematic Diagrams

    SCHEMATIC DIAGRAMS Main PCB JCM446-MA1M Note: KI signals are renamed. (e.g. KI0 on the keyboard PCB ⇒ KI1 on the main PCB) — 8 —...
  • Page 11 Sub PCBs KDM445-MA2M/MA3M — 9 —...
  • Page 12 Keyboard PCBs KDM4910K-KY1M/KY2M — 10 —...
  • Page 13 LED PCB KDM446-LD1M — 11 —...
  • Page 14 LED PCB KDM445-LD2M PCB NAME — 12 —...
  • Page 15 LED PCB KDM446-LD3M PCB NAME LED PCB KDM445-LD4M PCB NAME — 13 —...

  • Page 16: Exploded View

    EXPLODED VIEW — 14 —...

  • Page 17: Parts List

    PARTS LIST CTK-220L Notes: This parts list does not include the cosmetic parts, which parts are marked with item No. "R-X" in the exploded view. Contact our spare parts department if you need these parts for refurbish. Prices and specifications are subject to change with- out prior notice.
  • Page 18 Item Code No. Parts Name Specification Main PCB 6925 6160 Main PCB ass'y (MA1M) M240438*3 LSI1 2012 4690 LSI, CPU MSM6755B-13 2105 5922 IC RH5VL40AA-T1 2105 4452 IC HD74HC174FPTR 2105 5796 IC HD74HC4511FPTR Q1 - Q4 2259 2555 Transistor, Chip, Digital UMW1NTL Q5 - Q8 2259 2562 Transistor, Chip, Digital...
  • Page 19 Nov, 1996 MA1100761A...

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