Technics_SX-KN7000P_Service_Manual 电路图.pdf

ORDER NO. EMID0207013C0 A5 PCM KEYBOARD SX-KN7000P SX-KN7000PC SX-KN7000EX SX-KN7000EF SX-KN7000EH SX-KN7000EQ SX-KN7000EG SX-KN7000EB SX-KN7000EV SX-KN7000GN SX-KN7000GM SX-KN7000GH SX-KN7000GT SX-KN7000GU (P) U.S.A. (PC) Canada (EX) Norway, Sweden, Denmark, Finland, Spain, Portugal, Greece, Poland, Czech,South Africa (EF) France (EH) Netherlands (EQ) Germany (EG) Austria, Switzerland, Italy (EB) Great Britain (EV) Belgium (GN) Australia, New Zealand (GM) Malaysia, Singapore (GH) Hong Kong 1 RadioFans.CN 收音机爱 好者资料库 (GT) Taiwan (GU) Thailand, Indonesia, Dubai, Brazil, Philippines, Barkley(special) SPECIFICATIONS SPECIFICATIONS KEYBOARD61 KEYS (WITH INITIAL TOUCH) SOUND GENERATORPCM MAX. POLYPHONY128 NOTES 2 RadioFans.CN 收音机爱 好者资料库 SOUNDSNUMBER OF SOUNDS: 1236 SOUNDS (1187 SOUNDS + 2 ORGAN DRAWBARS + 2 ORGAN TABS + 3 ACCORDION REGISTERS + 41 DRUM KITS) SOUND GROUP: PIANO, GUITAR, STRINGS mark in the circuit diagram or in the parts list are essential for safety. When replacing these parts, be sure to use onlythe specified parts. 3. Use the specified types for internal wiring (double-insulated wiring, etc.). 4. When replacing parts on the AC primary side (power transformer, electric switch, electrical cord, noise-prevention condenser, etc.), wind the lead wire and secure it by soldering. 5. Do not let the wiring come into contact with heat-emitting devices (fuse resistor, radiator plate, etc.). 6. When replacing the wiring, make sure that it is not in contact with the unfinished or rough edge of a part. 7. When replacing the power cord (except for the plug-in type), tug it from various directions to confirm that it does not slip out of place. 8. Spacing If soldering was done on the AC primary circuit, confirm that the interval between the soldered terminals or between the terminal and surrounding metallic parts is at least the minimum required (between the primary circuit and the chassis: atleast6.5 mm; between primary circuit terminals: at least 4.0 mm; between primary circuit terminals and secondary circuit terminals: at least 6.5 mm.). 2. Safety Precaution 2.1. Safety Precaution 1. Before servicing, unplug the power cord to prevent an electric shock. 2. When replacing parts, use only the manufacturers recommended components for safety. 3. Check the condition of the power cord. Replace if wear or damage is evident. 4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. 5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the customer from being exposed to a shock hazard. 8 2.2. Insulation Resistance Test 1. Unplug the power cord and short the prongs of the plug with a jumper wire. 2. Turn on the power switch. 3. Measure the resistance value with an ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as screw heads, connectors, control shafts, handle brackets, etc. Measurements should range from 4 MOhm to infinity for allexposedparts. (refer to Fig.1 ) Fig.1 3. OWNERS MANUAL 9 4. MIDI Implementation Chart 5. Keyboard Ranges This keyboard features Touch Response, by which you control the volume by playing the keys harder or softer. 6. Parts Location 10 7. Disassembly Instructions 7.1. Removing the top cabinet 1. Turn the keyboard cabinet upside down, and remove the bottom screws ( 17 pcs.) as shown in Fig.2 . 2. Place the keyboard bottomside down, and open the top cabinet . Fig.2 11 - The control panel is set up, and remove the top cabinet as shown in Fig.3 . Fig.3 7.2. Removing the control panel, power SW panel, SD panel, 12 net panel and keyboard unit - Remove the top cabinet (see step “Removing the top cabinet ”). - Remove the bottom screws(5pcs.) as shown in Fig.4 Fig.4 Control panel 1. Place the keyboard bottomside down. 2. Remove the control panel holding screws ( 4pcs.) as shown in Fig.7 . Power SW panel - Remove the power SW panel holding screws ( 2pcs.) as shown in Fig.7 . SD panel - Remove the SD panel holding screws ( 2pcs.) as shown in Fig.7 . Net panel - Remove the net panel holding screws ( 4pcs.) as shown in Fig.7 . 13 Keyboard unit - Remove the keyboard unit holding screws ( 2pcs.) as shown in Fig.7 . Fig.5 7.3. Removing the JACK and MAIN printed circuit boards JACK P.C.B. 1. Remove the jack panel mounting screws ( 5pcs.) as shown in Fig.6 . 2. Remove the JACK P.C.B. mounting screws (3 pcs.,3pcs, 3pcs.)as shown in Fig.6 . Fig.6 14 MAIN P.C.B. 1. Remove the main shild top case mounting screws ( 6 pcs.) as shown in Fig.7 . 2. Remove the MAIN P.C.B. mounting screws ( 10pcs.) as shown in Fig.7 . Fig.7 15 7.4. Removing the FAJ printed circuit board FAJ P.C.B. 1. Remove the FAJ angle mounting screws ( 3pcs.) as shown in Fig.8 . 2. Remove the FAJ P.C.B. mounting screws (6pcs.,3pcs, 9pcs.)as shown in Fig.8 . Fig.8 16 ASUB P.C.B. disasemble - Push the board holder libs as shown in Fig.8 . ASUB P.C.B. asemble - Paste the tape as shown in Fig.8 17 7.5. Removing the ACP printed circuit board ACP P.C.B. 1. Remove the ACP cover mounting screws ( 3pcs.) as shown in Fig.9 . 2. Remove the ACP P.C.B.and insuration sheet mounting screw (pc.) as shown in Fig.9 . Fig.9 18 7.6. Removing the LCD, CPL, CPC, CPR, ROT and INV printed circuit boards - Remove the control panel (see step “Removing the control panel, power SW panel, SD panel, net panel and keyboard unit ”). - Remove the control panel lid holding screws ( 10pcs.)as shown in Fig.10 . 19 LCD 1. Remove the LCD hinge holding screws ( 2pcs.) as shown in Fig.10 . 2. Remove the LCD holding screws ( 2pcs.) as shown in Fig.10 . CPL P.C.B. 1. Pull off the SLIDE VOLUME knob as shown in Fig.10 . 2. Remove the CPL P.C.B. mounting screws ( 11 pcs.) as shown in Fig.10 . CPR P.C.B. - Remove the CPR P.C.B. mounting screws ( 11 pcs.) as shown in Fig.10 . ROT P.C.B. , CPC P.C.B. and INV P.C.B. 1. Pull off the TEMPO/PROGRAM dial as shown in Fig.10 . 2. Remove the ROT P.C.B. mounting screws ( 2 pcs.) as shown in Fig.10 . 3. Remove the CPC P.C.B. mounting screws ( 2pcs.) as shown in Fig.10 . 4. Remove the INV P.C.B. mounting screws ( 2 pcs.) as shown in Fig.10 . Fig.10 20 7.7. Removing the SD and SDSW printed circuit boards - Remove the SD panel (see step “Removing the control panel, power SW panel, SD panel, net panel and keyboard unit ”). SD P.C.B. - Remove the SD P.C.B. mounting screws (2pcs.) as shown in Fig.11 . SDSW P.C.B. 21 - Remove the SDSW P.C.B. mounting screws ( 3 pcs.) as shown in Fig.11 . Fig.11 7.8. Removing the BEND and the HP P.C.B. - Remove the top cabinet (see step “Removing the top cabinet ”). BEND P.C.B. - Remove the BEND P.C.B. mounting screws ( 2 pcs.) as shown in Fig.12 . HP P.C.B. - Remove the HP P.C.B. mounting screw( ) as shown in Fig.12 . Fig.12 22 7.9. Removing the Disk Drive Unit 23 1. Remove the Disk Drive unit mounting screws ( 4 pcs. ) as shown in Fig.13 . 2. Remove the Disk Drive unit holding screws ( 4 pcs. ) as shown in Fig.13 . Fig.13 7.10. Removing the Power SW 1. Remove the Power SW panel (see step “Removing the control panel, power SW panel, SD panel, net panel and keyboard unit ”). 24 2. Remove the power SW mounting screws ( 2pcs. ) as shown in Fig.14 . Fig.14 7.11. Removing the 14cm SP, 12cm SP and 6.5cm SP - Remove the top cabinet (see step “Removing the top cabinet ”). 14 cm SP - Remove the 14 cm SPholding screws ( 4pcs.) as shown in Fig.15 . 25 12 cm SP - Remove the 12 cm SP holding screws ( 4pcs.) as shown in Fig.15 . 6.5 cm SP - Remove the 6.5 cm SP holding screws ( 4pcs.) as shown in Fig.15 . Fig.15 7.12. Removing the keys 26 - Remove the keyboard unit (see step “Removing the control panel, power SW panel, SD panel, net panel and keyboard unit ”). 1. Press downward on the rear of the key as shown in Fig.16 . 2. While pressing downward on the rear of the key, push the key forward and release it from the chassis. 3. Lift the key and remove it from the chassis. Fig.16 NOTE: To remove a black key, the white key to either side of it should be removed first. 8. Service Diagnostic Function The service diagnostic function makes it possible to determine whether the various test modes pass or fail. The test modes are completely independent of one another. Select a test mode as necessary, and run the test. To set to the service diagnostic mode: 1. Press and hold the C#3, D#3, C#4 keys, and then turn on the power switch. (refer to Fig.20 ) Fig.20 27 2. After the service diagnostic screen is displayed on the LCD, release the three keys. (refer to Fig.21 ) 3. Use the corresponding buttons below the “page select” display to select the respective test. Fig.21 8.1. ROM device test Fig.22 28 - Press the EXECUTE button to begin the test. - The test result (OK or NG) is displayed within twenty seconds. If the test result is NG, not only the respective IC, but also a break or short circuit in the ADDRESS/ DATA BUS as well as in any of the strobe signal lines may be the causeof thefailure. (refer to Fig.22 ) 8.2. RAM device test Fig.23 - Press the EXECUTE button to begin the test. - The test result (OK or NG) is displayed within a few seconds. If the test result is NG, not only the respective IC, but a break or short circuit in the ADDRESS/DATA BUS as well as in any of the strobe signal lines may be the causeofthe failure. (refer to Fig.23 ) 8.3. Other device test Fig.24 29 - Press the EXECUTE button to begin the test. - The test result (OK or NG) is displayed with in a few seconds. If the test result is NG, not only the respective IC, but also a break or short circuit in the ADDRESS/ DATA BUS as well as in any of the strobe signal lines may be thecause of thefailure. (refer to Fig.24 ) 8.4. Floppy Disk SAVE/LOAD test Fig.25 - Insert a formatted floppy disk into the Disk Drive. Press the START button to begin the test. - The test is carried out repeatedly. Data is saved and loaded, and then the two data sets are compared. The number of times that the test results in OK or NG are counted and displayed on the LCD. To interrupt the test, press the STOP button.(referto Fig.25 ) - Even when the Floppy Disk Drive is functioning properly, the test can result in NG. If this happens frequently, clean the magnetic heads of the Floppy Disk Drive with a 30 cleaning disk. Then, change the disk used in testing with another disk andreperformthe test. If the trouble is not solved, it is likely that the Disk Drive unit or some other part of the hardware is broken. 8.5. Panel SW & LED test Fig.26 - Press all the buttons on the Control Panel and confirm that the corresponding LED lights. - If an LED fails to light, the cause may be a defective switch or a break in the surrounding circuit, etc. - After all the buttons have been pressed, all the PANEL MEMORY LEDs light. If all switches are OK, “ALL DEVICE OK” is shown on the LCD. (If a switch is defective, nothing is shown.) (refer to Fig.26 ) - To light all the LEDs, press and hold the DEMO button. If an LED fails to light, the LED may be defective or there may be a break in the surrounding circuit. 8.6. LCD module test (LCD adjustment and confirmation) Fig.27 31 - Press the RGBWB, CROSSTALK, SAMPLE, CONTRAST or VIDEO OUT button to begin the respective test. (refer to Fig.27 ) RGBWB: All the dots light in red, green, blue, white, and finally black. The display can be held by pressing the DISPLAY HOLD button. CROSSTALK: An H pattern is shown. LCD crosstalk can be evaluated. To exit this test, press the EXIT button. SAMPLE: Several display patterns shown during normal use are shown. The display can be held by pressing the DISPLAY HOLD button. CONTRAST: The test pattern is shown. Adjust the contrast by the CONTRAST control on the right of the LCD. To exit this test, press the EXIT button. VIDEO OUT: Check each display mode of PAL and NTSC. To exit this test, press the EXIT button. - If the correct display is not shown during these tests, the LCD or LCD drive circuit may be defective. 8.7. In & Out interface test Fig.28 32 - The operation status of each input action part can be confirmed. If the part is operating properly, “OK” is shown, excluding the Expression Pedal. (refer to Fig.28 ) - When a keyboard key is pressed, the corresponding pitch and velocity aftertouch is displayed (only as long as the key is depressed). - The respective statuses for other input action parts are displayed. (Analog parts are shown as numerical values from 0 to 255, and switches are shown as ON or OFF.) - If the display fails to change when the part is operated, or if the change is abnormal, it may indicate a defective part. 8.8. MIDI IN/OUT test Fig.29 - First, set the COMPUTER terminal switch to MIDI. - Use a MIDI cable to directly connect the MIDI IN and MIDI OUT terminals. - When a keyboard key is pressed, the transmitted and received data are compared 33 and the MIDI terminal operation is indicated as being OK or NG. (refer to Fig.29 ) - If NG is shown, check both the IN and OUT terminals, as well as the circuit. 8.9. WAVE ROM test Fig.30 - Press the EXECUTE button to start the test. - The test result (OK or NG) is displayed within thirty seconds. If the test result is NG, not only the respective IC, but also a break or short circuit in the ADDRESS/DATA BUS as well as in any of the strobe signal lines may be the causeofthe failure. (refer to Fig.30 ) 8.10. SOUND SYSTEM test Fig.31 - Use the button in the SOUND GROUP to select an item from 1 to 6 (refer to Fig.31 and Fig.32 ). Press a keyboard key. 34 Fig.32 1. Generate a full amplitude sine wave in the pitch of each key. (No touch, fixed stereo center). If no sound is generated or if the sound is distorted, the sound generator ROM corresponding to the key position is defective. 2. For confirming the output pathway from the sound generator. (Fixed scale, no touch) The Lch and Rch sound outputs are confirmed separately. 3. Generate a full amplitude sine wave in the pitch of each key +2 octaves. (No touch, fixed stereo center) By generating a sound frequency outside the normal keyboard zone, you can confirm whether or not there is an abnormality in the sound output frequency zone. 4. Generates a full amplitude sine wave in the pitch of each key -2 octaves. (No touch, fixed stereo center) By generating a sound frequency outside the normal keyboard zone, you can confirm whether or not there is an abnormality in the sound output frequency zone. 5. Generate a sine wave in the pitch of each key with touch. You can confirm if the volume changes depending on the touch. 6. Generate a full amplitude sine wave in the pitch of each key at a -16 dB volume. (No touch, fixed stereo center) You can confirm the same sound output as in 1, at a lower volume. 8.11. SD test Fig.33 35 Load/save test - Insert the SD card. Press the START button to begin the test. - The test is carried out repeatedly. Data is saved and loaded, and then the two data sets are compared. The number of times that the test results in OK or NG are counted a