Introduction Casio Key Portable Keyboard CT-X870IN

The Casio Key Portable Keyboard CT-X870IN is designed for musicians seeking a versatile and expressive instrument. Featuring 61 touch-sensitive keys, it incorporates the advanced AiX Sound Source technology, offering 600 tones and 195 rhythms, including a rich selection of Indian sounds. The keyboard also supports features like auto-accompaniment and an easy-to-read LCD screen, making it user-friendly for both practice and performance. The CT-X870IN is priced at approximately $299.

Specifications

Model	CT-X870IN
Keyboard Touch Response	61 standard size keys 3 types, Off
Maximum Polyphony	48 notes (24 for certain tones)
Tones Built-in Tones Functions	600 Layer, Split, Piano/Organ button
Reverb	1 to 20, Off
Chorus	1 to 10, Tone
Metronome Beats per Measure Tempo Range	0 to 9 20 to 255
Song Bank
Demo Song	1
Built-in Songs	160
User Songs	10*1
User-recorded songs	6 (See “Recorder” below.)*1
Step Up Lesson
Lessons	3 (Listen, Watch, Remember), Easy Mode
Lesson Part	L, R, LR
Functions	Repeat, Voice Fingering Guide, Note Guide, Performance Evaluation
Auto Accompaniment
Built-in Rhythms	195
User Rhythms	10*2
Chord Book Function	Chord guide
Registration	32 (4 setups × 8 banks)
Recorder	Real-time recording, playback
Keyboard Play	5 songs, 6 tracks
Playing Along with a Built-in Songs	1 song (L, R, LR)
Memory Capacity	Approximately 40,000 notes (1 song)
Other Functions
Transpose	±1 octaves (–12 to +12 semitones)
Octave Shift	Upper 1/Upper 2/Lower, ±3 octaves
Tuning	A4 = 415.5 to 465.9 Hz (Initial Default: 440.0 Hz)
Preset Scales	17
Music Preset	310
One Touch Preset	195
Auto Harmonize	12 types
Arpeggiator	100 types
MIDI	16 multi-timbre received, GM Level 1 standard
Musical Information Function	Tone, Rhythm, Song Bank numbers and names, staff notation, fingering, pedal operation, tempo, measure and beat number, chord name, etc.
Pitch Bend Wheel	Pitch Bend Range 0 to 24 semitones
USB Flash Drive	SMF direct playback, data storage, data loading, data deleting, USB flash drive format

Inputs/Outputs USB port PEDAL jack Phones/Output jack Audio In jack	TYPE B Standard jack (6.3mm): sustain, sostenuto, soft, rhythm Stereo standard jack (6.3mm) Output Impedance: 167Ù, Output Voltage: 4.5V (RMS) MAX Stereo mini jack (3.5mm) Input Impedance: 10kÙ, Input Sensitivity: 200mV
Power Jack	DC9.5V
Power Supply	2-way
Batteries	6 AA-size alkaline batteries
Battery Life	Approximately 3 hours continuous operation on alkaline batteries
AC Adaptor	AD-E95100L
Auto Power Off	Approximately 30 minutes after last operation; Can be disabled.
Speakers	12cm × 2 (Output: 2.5W + 2.5W)
Power Consumption	9.5V = 7.5W
Dimensions	94.8 × 35.0 × 10.9 cm (37 5/16 × 13 3/4 × 4 5/16 inch)
Weight	Approximately 4.4kg (9.7 lbs) (without batteries)

Inputs/Outputs USB port PEDAL jack Phones/Output jack Audio In jack	TYPE B Standard jack (6.3mm): sustain, sostenuto, soft, rhythm Stereo standard jack (6.3mm) Output Impedance: 167Ù, Output Voltage: 4.5V (RMS) MAX Stereo mini jack (3.5mm) Input Impedance: 10kÙ, Input Sensitivity: 200mV
Power Jack	DC9.5V
Power Supply	2-way
Batteries	6 AA-size alkaline batteries
Battery Life	Approximately 3 hours continuous operation on alkaline batteries
AC Adaptor	AD-E95100L
Auto Power Off	Approximately 30 minutes after last operation; Can be disabled.
Speakers	12cm × 2 (Output: 2.5W + 2.5W)
Power Consumption	9.5V = 7.5W
Dimensions	94.8 × 35.0 × 10.9 cm (37 5/16 × 13 3/4 × 4 5/16 inch)
Weight	Approximately 4.4kg (9.7 lbs) (without batteries)

Maximum capacity per song: Approximately 320 kilobytes
Maximum capacity per rhythm: Approximately 64 kilobytes (1 kilobyte = 1,024 bytes)

Design and specifications are subject to change without notice

General Guide

(Power) button
VOLUME knob
INTRO, REPEAT button
4NORMAL FILL-IN, A-B button
VAR. FILL-IN, REW button
ENDING/SYNCHRO START, FF button
SYNCHRO STOP, pause button
START/STOP, PLAY/STOP button
[ACCOMP], PART SELECT, MUSIC PRESET button
PIANO/ORGAN, TOUCH button
TONE button
RHYTHM button
SONG BANK button
CATEGORY button
RECORD/STOP button
CHORD MODE, CHORD BOOK button
A.HAR./ARPEG., TYPE button
EASY MODE, BANK, $FREEZE button
Area1, LISTEN button
Area2, WATCH button
Area3, REMEMBER button
Area4, PHRASE button
STORE button
SPLIT, POINT button
LAYER, OCTAVE button
METRONOME, BEAT button
TEMPO/TAP button
FUNCTION button
Number keys
[–] and [+] keys
Speakers
Song Bank list
Rhythm list
Tone list
Display
Tray
- The tray is angled slightly. Take care so items placed on it do not slide off.
- Do not place cups or any other liquid containers on the tray.
PITCH BEND wheel
CHORD root names
Percussion instrument list
Back
USB flash drive
USB port
PEDAL jack
AUDIO IN jack
DC 9.5V terminal
PHONES/OUTPUT jack

Casio Key Portable Keyboard CT-X870IN Display

Tone, rhythm, song bank, Music Preset indicators
Indicators
Number, setting name/status display
I N F V E (Auto Accompaniment Types) indicators*, ACCOMP (Auto Accompaniment) indicator
Chord name
Tempo, measure
Beat display
Part, fingering display
Keyboard display
Registration bank indicator/Track Indicator
I:Intro, N:Normal, F:Fill-in, V:Variation, E:Ending

Using the (29) Number Keys and the (30) [–] and [+] Keys

Number Keys

Use the number keys to enter numbers and values.

Use the number keys to enter the same number of digits as the displayed value.
Example: To enter tone number 001, input 03 03 1.

While entering a value, you can apply your input by pressing 28 FUNCTION.
Example: To enter and apply tone number 010, input 1⇒0⇒ 28 FUNCTION.
To cancel input, long-press the [5] (EXIT) key.

If the NUM indicator is not shown on the display, press the [0] number key to display it and then input the value you want.

[–] and [+] Keys

Pressing [–] reduces the currently displayed number or value by one, while [+] increases it by one. Holding down either button will sequentially increase or decrease the displayed number or value until you release the button. Pressing both buttons at the same time will return the number or value to its initial default or recommended setting.

If input of a negative value is allowed, pressing [–] while the value is flashing on the display will add a minus sign (–) to the left of the value. Pressing [+] while the value is flashing on the display changes back to a positive value.

[2] (o), [3] (p), [5] (EXIT), and [6] (ENTER) Keys

Depending on the operation being performed, [2] (o), [3] (p), [5] (EXIT), and [6] (ENTER) key operations are enabled while the NUM indicator is not shown on the display.

[5] (EXIT) Key Long-press

After configuring function settings with the Function (28) button, you can exit the setting screen by long-pressing [5] (EXIT). For details, see “FUNCTION Button (28) Functions” (page EN-43).

Connecting to Audio Equipment

This Digital Keyboard can be connected to commercially available stereo, amplifier, or recording equipment, to a portable audio player or other equipment.

Outputting Keyboard Notes to Audio Equipment

Connection requires commercially available connecting cords, supplied by you.

The connecting cords should have a stereo standard plug on one end and a plug that matches the configuration of the external device on the other end.

IMPORTANT

Turn off the external device when making connections. After connecting, turn down the Digital Keyboard and external device volume levels whenever turning power on or off.
After connecting, turn on the Digital Keyboard and then the external device.
If keyboard notes sound distorted when they are sounded from external audio equipment, lower the Digital Keyboard’s volume setting.

Playing an External Device from the Digital Keyboard

Connection requires commercially available connecting cords, supplied by you.

The connecting cords should have a stereo mini plug on one end and a plug that matches the configuration of the external device on the other end.
Turn off the Digital Keyboard when making connections. After connecting, turn down the Digital Keyboard and external device volume levels whenever turning power on or off.
After connecting, turn on the external device and then the Digital Keyboard.
If notes are distorted when they are sounded on the external device, lower the volume setting of the external device.

Digital Keyboard en AUDIO IN jack

Center Cancel (Vocal Cut)

Enabling Vocal Cut cuts (mutes or minimizes) the vocal in the sound being input from the en AUDIO IN jack. Note that this function cancels the sound in the center position of the audio, which may (depending on how the original audio was mixed) end up canceling something else other than the vocal part. How vocal cut is performed depends on the sound being input.
For information about configuring settings, “FUNCTION Button (cs) Functions” (page EN-43).

Getting Ready to Play

Preparing the Music Stand

Power Supply

Either an AC adaptor or batteries can be used to power this Digital Keyboard. Normally, use of AC adaptor power is recommended.

The AC adaptor does not come with this Digital Keyboard. Purchase it separately from your retailer. See page EN-1 for information about options.

Using the AC Adaptor

Make sure that you use only the AC adaptor specified for this Digital Keyboard. Use of a different type of AC adaptor can cause malfunction.

Be sure to turn off Digital Keyboard power before connecting or disconnecting the AC adaptor.
The AC adaptor will become warm to the touch after very long use. This is normal and does not indicate malfunction.
To prevent breaking of the wire, take care to avoid putting any type of load on the power cord.
Never insert metal, pencils, or any other objects into the product’s 9.5V DC terminal. Doing so creates the risk of accident.

Using Batteries

IMPORTANT

Be sure to turn off power before loading batteries.
It is up to you to prepare six commercially available AA-size batteries. Do not use oxyride batteries or any other nickel based batteries

Open the battery cover on the bottom of the Digital Keyboard.
Load six AA-size batteries into the battery compartment.
Make sure the positive + and negative - ends of the batteries are facing as shown in the illustration.
Insert the tabs of the battery cover into the holes on the side of the battery compartment, and close the cover.

Low Battery Indication
The indicator shown below starts to flash to let you know when battery power is low. Replace the batteries with new ones.

low_battery_indication_casio_key_portable_keyboard_ct-x870in.png

Description

Convenience and longevity were considered in the construction of the CT-X870IN. The full-size keys offer a pleasant playing experience, and its small size makes it portable. A backlit LCD display on the keyboard facilitates navigating through the many settings and operations. Users may experiment with a variety of musical styles, from classical to modern genres, thanks to its vast collection of sounds and rhythms.

A fun and imaginative touch to the keyboard is the Dance Music Mode, a special function that lets users compose and play along with dance music tracks. It is an excellent tool for recording and producing music because of its USB-MIDI and audio interface, which also allow for smooth communication with computers and other musical instruments.

Setup Guide

It is simple to set up the Casio Key Portable Keyboard CT-X870IN. Here is a detailed guide:

Unbox the keyboard and ensure all components are included (keyboard, power adapter, music stand, etc.).
Insert batteries or connect the AC adapter to power the keyboard.
Adjust the music stand to your preferred height.
Connect the keyboard to a computer or other devices via USB-MIDI or audio interface if necessary.
Familiarize yourself with the interface by navigating through the menus and settings using the buttons and controls.

Important!
Please note the following important information before using this product.

Before using the optional AC Adaptor to power the unit, be sure to check the AC Adaptor for any damage first. Carefully check the power cord for breakage, cuts, exposed wire and other serious damage. Never let children use an AC adaptor that is seriously damaged.
Never attempt to recharge batteries.
Do not use rechargeable batteries.
Never mix old batteries with new ones.
Use recommended batteries or equivalent types.
Always make sure that positive (+) and negative (–) poles are facing correctly as indicated near the battery compartment.
Replace batteries as soon as possible after any sign they are getting weak.
Do not short-circuit the battery terminals.
The product is not intended for children under 3 years.
Use only a CASIO AD-E95100L adaptor.
The AC adaptor is not a toy.
Be sure to disconnect the AC adaptor before cleaning the product.

Troubleshooting

	Symptom	Action
Included Accessories
	I can’t find something that should be here.	Carefully check inside all of the packing materials.
Power Requirements
	Power will not turned on.	Check the AC adaptor or make sure that the batteries are facing correctly (page EN-8). Replace the batteries with new ones or switch over to AC adaptor power (page EN-8).
	The display lightsup momentarily but power does not turn on whenI press the 1P (power) button.	Press 1P (power) firmly and completely to turn on power.
	The Digital Keyboard outputs a loud sound and then suddenly powers down.	Replace the batteries with new ones or switch over to AC adaptor power (page EN-8).
	The Digital Keyboard suddenly powers down after about 30 minutes.	This happens when Auto Power Off (page EN-9) is triggered.
Display
	The display keeps going out or are flashing.	Replace the batteries with new ones or switch over to AC adaptor power (page EN-8).
	On-screen keyboard keys or notes remain on the display.	A Step Up Lesson is in progress and the Digital Keyboard is waiting for you to play the next note in the song. To stop this from happening, cancel the lesson (page EN-23).
	Screen contents are visible only from straight ahead.	This is dues to production limitations. It does not indicate malfunction.
Sound
	Nothing happens when I press any keyboard key.	Adjust the volume setting (page EN-9). Check if something is plugged into en on the back of the Digital Keyboard. Turn power off and then back on to initialize all keyboard settings (page EN-9).
	Nothing happens or notes do not play normally when I play notes on the left side of the keyboard.	Press 9 to disable chordinput in the accompaniment keyboard area (page EN-27).
	Nothing happens when I start an Auto Accompaniment.	With rhythms 186 to 195, nothing will sound until you play a chord on the keyboard. Try playing a chord (page EN-27). Check and adjust the accompaniment volume setting (page EN-32). If there is no userrhythm stored in memory, AutoAccompaniment will not startwhen you press8 while a rhythmin the rangeof 196 to 205 is selected (page EN-27). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9).
	Nothing happens when I start playback of a built-in song.	It takes a little timeafter you pressthe button untilthe song startsto play. Wait for a moment for the song to start. Check and adjust the song volume (page EN-21). If there is no usersong stored in memory, songplayback will not start when you press8 while a songin the rangeof 161 to 176 is selected (page EN-21). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9).
	The metronome does not sound.	Check and adjust the metronome volume setting (page EN-32). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9).

	Symptom	Action
	Notes keep sounding, without stopping.	Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9). Replace the batteries with new ones or switch over to AC adaptor power (page EN-8).
	Some notes are cut off while they are playing.	Notes are cut off whenever the number of notes being sounded exceeds the maximum polyphony value of 48 (24 for some tones). This does not indicate malfunction.
	The volume or tone setting I made has changed.	Adjust the volume setting (page EN-9) and the equalizer setting (page EN-16). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9). Replace the batteries with new ones or switch over to AC adaptor power (page EN-8).
	Output volume does not change even though is change my keyboard touch.	Change the Touch Response setting (page EN-10). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9).
	In certain keyboard ranges, the volume and tone quality sound are slightly different from those in other keyboard ranges.	This is due to system limitations. It does not indicate malfunction.
	With some tones, octaves do not change at the far ends of the keyboard.	This is due to system limitations. It does not indicate malfunction.
	The pitch of the notes does not match other accompanying instruments or sounds strange when played long with other instruments.	Check and adjust the transpose (page EN-17) and tuning settings (page EN-17). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9).
	The reverb of notes seems to change suddenly.	Check and adjust the reverb setting (page EN-15). Turn power off and then back on to initialize all Digital Keyboard settings (page EN-9).
Operation
	When I perform a skip forward or skip back operation, the skip operation moves multiple song measures instead of only a single measure.	While song playback is stopped or a Step Up Lesson is in progress, skip forward and skip back operations are performed in phrase units (page EN-19).
	Tone, rhythm, and other settings revert to their initial defaults whenever you turn on the Digital Keyboard.	Though Digital Keyboard settings reset when you turn off the Digital Keyboard (page EN-9), you can save setups to registration memory for instant recall whenever you need them (page EN-37).
Computer Connection
	I can’t exchange data between the Digital Keyboard and a computer.	Check to make sure that the USB cable is connected to the Digital Keyboard and computer, and that the device is selected correctly with your computer’s music software settings (page EN-53). Turn off the Digital Keyboard and then exit the music software on your computer. Next, turn the Digital Keyboard back on and then restart the music software on your computer.

Error Indicators

Display	Cause	Action
Err Limit	You are attempting to record more than 999 measures.	Make your recordings up to 999 measures long.
Err Mem Full	You are attempting a recording that exceeds the allowable per song limit.	Keep song recordings with the allowable per song limit.
Err DataFull	You are attempting to record more than five songs.	Delete some of the songs in memory.
Err No Media	The USB flash drive is not connected to the Digital Keyboard’s USB flash drive port. The USB flash drive was removed while some operation was in progress. The USB flash drive is write-protected. The USB flash drive has anti-virus software.	Correctly plug the USB flash drive into the USB flash drive port. Do not remove the USB flash drive while any operation is in progress. Unprotect the USB flash drive. Use a USB flashdrive that doesnot have anti-virus software.
Err No File	There is no loadable file or no playable file in the “MUSICDAT” folder.	Move the file you want to load or play into the appropriate location (page EN-50) in the “MUSICDAT” folder.
Err No Data	You are attempting to save user data when there is no data to save.	Select a user data item for which there is data to save.
Err ReadOnly	A read-only file with the same name you are trying to use is already stored on USB flash drive.	Change the name and then save the new data. Remove the read-only attribute from the existing USB flash drive file and overwrite it with the new data. Use a different USB flash drive.
Err MediaFul	There is not enough space available on the USB flash drive.	Delete some of the files on the USB flash drive to make room for new data (page EN-51) or use a different USB flash drive.
Err ManyFile	There are too many files on the USB flash drive.	Delete some of the files on the USB flash drive to make room for new data.
Err NotSMF01	You are attempting to play back SMF Format 2 song data.	This Digital Keyboard supports playback of SMF Format 0 or Format 1 only.
Err Large Sz	The SMF file on the USB flash drive cannot be played because it is too big. The data you are trying to import cannot be imported because it is too big.	The Digital Keyboard supports playback of SMF files up to 320 KB. The Digital Keyboard supports import of data (per item) up to the maximum sizes shown below. Rhythms: Approximately 64 KB
Err WrongDat	The USB flash drive data is corrupted. USB flashdrive contains datathat is notsupported by this Digital Keyboard.	—
Err Format	The USB flash drive format is not compatible with this DigitalKeyboard. The USB flash drive is corrupted.	Format the USB flash drive on the Digital Keyboard. Use a different USB flash drive.

Pros & Cons

Pros

Extensive library of tones and rhythms
Portable and lightweight design
Touch-sensitive keys for expressive playing
Dance Music Mode for creative music-making
USB-MIDI and audio interface for connectivity

Cons

No weighted keys; may not be ideal for pianists looking for an authentic piano feel
Some users find the menu navigation complex
Battery life may vary depending on usage

Customer Reviews

The Casio Key Portable Keyboard CT-X870IN has received high marks from customers for both its sound quality and adaptability. Numerous customers value the extensive feature set and user-friendliness, particularly for novices. Some have pointed out that the menu system might initially be a little daunting, too.

The absence of weighted keys and a few minor battery life concerns are frequent grievances. Because of its performance and value, the CT-X870IN is generally well rated.

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