Casio ct 870 service manual

Page 1

Ñ 2 Ñ CONTENTS Page Specifications ................................................................................................................................ 2 Block Diagram ............................................................................................................................... 3 Circuit Description ......................................................................................................................... 4 Major Waveforms ........................................................................................................................ 11 Printed Circuit Board ................................................................................................................... 12 Schematic Diagrams ................................................................................................................... 13 Exploded View ............................................................................................................................ 17 Parts List ..................................................................................................................................... 19 SPECIFICATIONS GENERAL Number of keys: 61 Polyphonic: 24-note (12 for some tones) Preset tones: 100, with split/layer functions Keyboard controls: Touch response: On/Off, Key transpose: 12 steps (F#-C-F) Auto-rhythms: 100, Tempo control: 40 to 255 Auto-accompaniment: Mode: CASIO Chord/Fingered Chord/Full Range Chord Controller: Intro/Fill-In, Synchro/Ending, Normal/Variation Reverb effects: Hall/Stage/Room Registrations: 6, Parameters registered: Tone No. (Normal, Layer, Split, Layer Split), Rhythm No., Tempo, Accompaniment volume, Chord type, Reverberation type, Split/Layer settings, Pitch bend range, Basic channel, Local on/off, Portamento on/off Song memory: 1, Real-time recording, Memory capacity: Approx. 1200 notes in total Demo tunes: 1, including Ñ Mei Wenti (Edward Alstrom) Tuning control: 440Hz ± 50 cents Built-in speakers: 12 cm dia. 2.5 W input rating: 2 pcs. MIDI: 16 multi-channel reception Terminals: Phone Jack [Output impedance: 110 W, Output voltage: 4.2 V(rms) MAX], Sustain Jack, MIDI Jacks (IN, OUT), AC Adapter Jack (9 V) , Foot volume Jack Auto power off: Approximately 6 minutes after the last operation Power source: 2-way AC or DC source AC: AC adapter DC: 6 D size dry batteries Power consumption: 7.7 W Dimensions (HWD): 140 x 997 x 376 mm (5-1/2 x 39-5/16 x 14-13/16 inches) Weight: 5.4 kg (11.9 lbs) without batteries