This document provides a comprehensive service manual for the Panasonic PCM Keyboard, model SX-KZ250. It covers various aspects of the device, including its functions, technical specifications, usage features, and maintenance instructions.
Function Description
The Panasonic SX-KZ250 is a PCM (Pulse Code Modulation) keyboard designed for musical performance and composition. It features a sound generator capable of producing 61 keys (with initial touch) and offers 28 notes of maximum polyphony. The keyboard includes a variety of sound and rhythm features, allowing users to create diverse musical arrangements.
Sound Features:
The keyboard offers 128 sounds and 1 drum set. Users can select sounds and apply various effects. The "SOUND SELECT" function allows choosing from the available sounds, while "EFFECT" provides options for STEREO CHORUS and SUSTAIN. "SOUND EFFECT" further enhances the audio output.
Rhythm Features:
The SX-KZ250 comes with 100 rhythm patterns. The "RHYTHM SELECT" function allows users to choose from these patterns. The "RHYTHM CONTROL" includes START/STOP, SYNCHRO, INTRO & ENDING, and FILL IN, TEMPO, providing comprehensive control over rhythm playback.
Auto Play Chord:
This feature includes "ONE FINGER, FINGERED" and "ONE TOUCH PLAY" modes, simplifying chord playing for users.
Duet:
The "DUET" function allows for playing two different sounds simultaneously, enhancing the richness of the musical output.
Panel Memory:
The keyboard allows users to store up to 2800 notes in its panel memory, enabling them to save and recall their musical creations.
Sequencer:
The sequencer has a storage capacity of approximately 2800 notes. It supports various functions such as RECORD, PLAY, OVER DUB, and ERASE, allowing users to compose and edit their music.
Display:
The display shows 3 digits, providing visual feedback for various settings and functions.
Controls:
The keyboard includes controls for MAIN VOLUME, BALANCE, TRANSPOSE, and CONDUCTOR, offering extensive control over the sound and performance.
Demo:
A demo function is available to showcase the keyboard's capabilities.
Mode Set:
The "MODE SET" includes functions like SYNCHRO START, TUNING, TOUCH CURVE, SPLIT POINT, FOOT SW SETTING, MIDI BASIC CH, LOCAL CONTROL, ACCOMP MIDI OUT, DRUM SEND MODE, and BULK DUMP, providing advanced customization options.
Terminals:
The SX-KZ250 features DC IN 12V, PHONES/LINE OUT, MIDI (IN,OUT), and FOOT SWITCH terminals for connectivity.
Output:
The output power is 2 W × 2 (with batteries) and 3.5 W × 2 (with SY-AD6/AD6B/AD7 AC adaptor).
Speakers:
The keyboard is equipped with two 12 cm × 2 speakers.
Important Technical Specifications
- Keyboard: 61 keys (with initial touch)
- Sound Generator: PCM
- Maximum Number of Notes Simultaneously: 28 notes
- Sounds: 128 sounds, 1 drum set
- Rhythm Patterns: 100 patterns
- Sequencer Storage Capacity: Approx. 2800 notes
- Output Power:
- With batteries: 2 W × 2
- With AC adaptor: 3.5 W × 2
- Speakers: 12 cm × 2
- Power Requirement:
- Batteries: DC 9 V (using R20/LR20 "D" size, UM-1 batteries × 6)
- AC with SY-AD6/AD7 AC Adaptor: AC 120V 60 Hz (U.S.A., Canada), AC 220V/230V/240V, 50/60 Hz (Europe, Australia, Asia, etc.), AC 230V, 50/60 Hz (New Zealand and Europe except for United Kingdom)
- Dimensions (W × H × D): 96.4 cm × 11.2 cm × 36.2 cm (37-15/16" × 4-13/32" × 14-1/4")
- Net Weight: 6.8 kg (15.0 lbs)
- Accessories: AC Adaptor SY-AD6/AD6B/AD7 (some districts only), Music Stand
Usage Features
Initial Setting:
To return to original factory settings and reset customer settings, press the PLAY button to turn off the instrument. Then, while pressing the leftmost C and E keys on the keyboard, turn the PLAY button on again. This will initialize all stored data in the sequencer, panel memory, and other settings.
Conductor Settings:
The CONDUCTOR function allows assigning SOUND 1 and SOUND 2 to the keyboard in different ways. Users can adjust the volume balance of the two sounds.
- All keys play SOUND 1: The entire keyboard plays SOUND 1.
- All keys play SOUND 2: The entire keyboard plays SOUND 2.
- All keys play both SOUND 1 and SOUND 2 (dual sound): The entire keyboard plays both sounds simultaneously.
- The right keys play SOUND 1 and the left keys play SOUND 2 (split keyboard): The keyboard is split, with different sounds assigned to each section.
Terminals (On the rear panel):
- MIDI (Musical Instrument Digital Interface): Standard specification that enables connection to equipment such as synthesizers and personal computers. Data transmission and reception are possible between the keyboard and other instruments provided with MIDI terminals.
- IN: The terminal that receives data from external equipment.
- OUT: The terminal that transmits data from this instrument to external equipment.
- Use a 5-pin DIN cord (less than 15 m long) for these connections.
- PHONES / LINE OUT: Use headphones with over 16 Ω impedance. Output level is 1.5 Vrms, 16 Ω. Headphones, a keyboard amplifier, or stereo equipment can be connected to this terminal. When another apparatus is connected to this terminal, the speaker system is automatically switched off, and sound is heard only through the connected device.
- DC IN 12V: Standard household current can be used by connecting the Technics SY-AD6(B) /AD7 AC adaptor between a wall outlet and the DC IN 12 V terminal on the instrument. Use of a different AC adaptor may damage this instrument.
- FOOT SW: The optional SZ-P1 Foot Switch (sold separately) can be connected to this terminal to control various functions.
Keyboard Ranges:
This keyboard features Touch Response, which allows controlling the volume by playing the keys harder or softer. The manual includes a visual representation of the keyboard range with corresponding musical notes.
MIDI Implementation Chart:
The manual provides a detailed MIDI implementation chart, outlining the transmitted and recognized functions, channels, note numbers, velocity, aftertouch, pitch bender, control changes, program changes, system exclusive messages, and system real-time commands. This chart is crucial for integrating the SX-KZ250 with other MIDI-compatible devices.
Maintenance Features
Disassembly Instruction:
The manual provides step-by-step instructions for disassembling the keyboard, which is essential for maintenance and repair.
- Removing the bottom case: Turn the keyboard cabinet upside down and remove 28 screws.
- Removing the MAIN and CP printed circuit boards: Remove the bottom case. Then, remove 8 screws and 3 screws for the MAIN P.C.B., and 3 screws, 9 screws, and 6 screws for the CP P.C.B.
- Removing the MKB 1, 2, 3, BATT(+) and BATT(-) printed circuit boards: Remove the bottom case. Then, remove 21 screws for MKB 1, 2, 3 P.C.B. and 4 screws for the battery cover. Pull out the BATT (+) P.C.B. and BATT (-) P.C.B. from the cabinet.
Symptoms Which Appear to Be Signs of Trouble:
The manual includes a troubleshooting guide that lists common phenomena and their remedies:
- The buttons, keys, etc. malfunction: Turn off the PLAY button, then turn it on again. If this is not successful, turn off the PLAY button, then, while pressing the leftmost C and E keys on the keyboard, turn the PLAY button on again. This resets all programmable settings, functions, and memories.
- No sound is produced when the keys are pressed: Turn off the PLAY button, disconnect the AC adaptor, or remove the batteries once. Adjust the volume with the MAIN VOLUME buttons. The local control is set to [OFF]. Set the local control to [ON].
- You hear sound effects when you attempt to select a different sound or rhythm on the number pad: The SOUND EFFECT button is on. Press it to turn it off.
- When using batteries, the volume level becomes low, the sound is distorted, or the buttons and keys do not function: The batteries are low. Replace the batteries as soon as possible.
- Only percussive instrument sounds are produced when the keyboard is played: A DRUM SET sound (number 129) has been selected. On the SOUND/RHYTHM SELECT number pad, select a different sound number.
- No sound is produced for the rhythm: On the SOUND/RHYTHM SELECT number pad, COMPOSER (099 or 100) was selected although a rhythm pattern has not been stored. Select a different rhythm or store a rhythm pattern in the COMPOSER.
- The rhythm does not start: The tempo has been set to a number lower than 048, and the mode has changed to the external CLOCK mode. Set the tempo to 048 or higher. The GM MODE SET setting has been set to GM. Set the mode to Standard.
- Storage is not possible: The remaining memory capacity is 0. When recording in the SEQUENCER by overdubbing, you can repeat the recording procedure a maximum of 8 times. If you wish to continue recording, a portion of the recorded contents must first be erased.
- Noise from this instrument can be heard in a nearby radio or TV set: This sometimes occurs when electrical equipment such as a radio or TV is used near the instrument. Try moving such electrical equipment further away from the instrument.
- Radio or TV noise can be heard in this instrument: The sound may be coming from a nearby broadcast station or amateur radio station. If the sound is bothersome, consult your dealer or service center.
- The cabinet becomes warm during use: This instrument has a built-in amplifier section that heats the cabinet to some degree. This is not an indication of trouble.
Precaution Before Servicing:
- Precautions for measuring of the output waveforms: The waveform was measured with a "National Digital Storage Oscilloscope VP-5730A". Therefore the waveforms of musical tone signals shown may differ somewhat due to the difference in the timing of triggering. Since the X10 type probe is used, the indicated voltage value on the bottom part of each waveform photo is 1/10 of the actual value (e.g. 0.2 V/cm should be 2.0 V/cm).
- Important safety notice: Components identified by a triangle mark have special characteristics important for safety. When replacing any of these components, use only manufacturer's specified parts.
- Symbolic Marks: The symbolic marks for resistors and capacitors used in this circuit are classified as follows:
- Resistors: Fixed Carbon Film Resistors, Fixed Metal Film Resistors, Fixed Wire Wound Resistors, Fuse Type Fixed Metal Oxide File Resistors.
- Capacitors: Polyester Capacitors, Non-Polarized Electrolytic Capacitors, Tantalum Solid Electrolytic Capacitors, Metallized Plastic Film Capacitors, Temperature Compensating Ceramic Capacitors, High-Dielectric Constant Ceramic Capacitors, Axial Lead Ceramic Capacitors, Metallized Polyester Film Capacitors for Across the Line, Aluminum Electrolytic Capacitors for Smoothing Circuit, Multilayer Ceramic Chip Capacitors.
Wiring Connection Diagram and Block Diagram:
The manual includes detailed wiring connection diagrams and block diagrams for the entire keyboard system, including the main board, control panel, and keyboard assemblies (MKB1, MKB2, MKB3). These diagrams are essential for understanding the internal circuitry and for troubleshooting.
Replacement Parts List:
Comprehensive lists of replacement parts are provided for the main P.C.B., control panel P.C.B., battery circuit, and keyboard circuits (MKB1, MKB2, MKB3), along with cabinet and chassis parts. Each list includes the reference number, part number, description, and quantity. This information is critical for ordering and replacing components during repair.
Packing:
The manual also includes diagrams and a list of packing materials, which can be useful for shipping or storing the device.
This service manual is intended for experienced repair technicians only and is not designed for use by the general public. It contains warnings and cautions to advise technical individuals of potential dangers in attempting to service a product.
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