Korg_SP-250_Service_Manual电路图.pdf

《Korg_SP-250_Service_Manual电路图.pdf》由会员分享，可在线阅读，更多相关《Korg_SP-250_Service_Manual电路图.pdf（34页珍藏版）》请在收音机爱好者资料库上搜索。

1、 S S Se e er r rv vi i ic c ce e e MMMa an nu u ua a al l l van SP-250 CONTENTS 1) Circuit Diagrams : Page 2 - 6 2) Disassembly : Page 7 - 20 3) Test Mode : Page 21 - 29 4) Parts List : Page 30 - 34 1st Edition Issued date: March 30, 2006 Issued by: KORG INC. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机

2、爱 好者资料库 Pin 5 is the standby switch pin. The amplifier is turned on by applying approximately 2.5 V or more to this pin through an external resistor sp250m.sch-1 - Wed Nov 23 16:39:48 2005 RadioFans.CN 收音机爱 好者资料库 sp250m.sch-2 - Wed Nov 23 16:42:00 2005 sp250m.sch-3 - Wed Nov 23 16:43:07 2005 TEST MO

3、DE Connection: 12V direct-current power supply. POWER ON while pressing both REVERB and TRANSPOSE to enter TEST MODE. MASK ROM Check MIDI IN/OUT CHECK *Internal Check OK METRONOME LED Flashing then go to next test. *Internal Check NG Following LED flashing and stop test. MASK ROM : PIANO 1 LED Flash

4、ing MIDI Loop : PIANO 2 E.PIANO2 LED Flashing Press METRONOME PIANO2 LED ON Enter this test. Check Max Output level/Distortion Ratio in order of OUTPUT/PHONES1/PHONES2 by pressing METRONOME. Acceptable Range: OUTPUT L/R : xx.x - yy.y PHONES1 L/R : xx.x - yy.y PHONES2 L/R : xx.x - yy.y *On Checking O

5、utput L/Mono, Dummy Plug is inserted in Output R *On Checking Output R, Dummy Plug is inserted in Output L/Mono *On checking Phones1/2, 33ohm loading is inserted. *Master Volume should be MAX. After finishing this test/measurement, press METRONOME and go to next test. LED E.PIANO1 ON. Check Noise Le

6、vel in order of OUTPUT/PHONES1/PHONES2 by pressing METRONOME. Acceptable Range: OUTPUT L/R : xx.x - yy.y PHONES1 L/R : xx.x - yy.y PHONES2 L/R : xx.x - yy.y *On Checking Output L/Mono, Dummy Plug is inserted in Output R *On Checking Output R, Dummy Plug is inserted in Output L/Mono *On checking Phon

7、es1/2, 33ohm loading is inserted. *Master Volume should be MAX. After finishing this test/measurement, press METRONOME and go to next test. LED E.PIANO2 ON. Please press METRONOME twice. and got to HARPSI LED ON. Then Press METRONOME and check the speakers. Sine Wave Output comes from in order of Le

8、ft Bass Sound/Right Bass Sound/Left Treble/Right Treble. (BASS : 120Hz) (Treble: 3kHZ) *The order of output sound should be important. *Master Volume should be MAX. *There are no Vibration Noise, distortion from speakers. *Left and Right volume should be even. After finishing this test/measurement ,

9、 press METRONOME and go to next test. LED VIBES ON. Pressing key from highest end key sequentially with middle force and check if sound comes correctly. If the key is stroke correctly, the sound comes from speakers. Check it whether the sounds from L and R have the same Phase by hearing. If the pres

10、sing is not admitted, the sound does not come out. In the case of no sound, return to one octave higher key and press and check again. If sound does not come out at the same key several times, the key is NG. After pressing final key, all LED are ON. Confirm if the all LED are ON correctly. Press MET

11、RONOME. The left end LED REVERB only ON flashing. Press SWs from left to right sequentially. In this case, LED is also on flashing one by one. *Press SW lightly. If the sensitive is low, the SW is NG. *Adequate Click Feeling is necessary. After finishing this test, press METRONOME and go to next tes

12、t. SP-250 goes to next test automatically. LED ORGAN2 : ON TEMPO VR moving from Left edge to Right edge: Bank LED lights from above to under sequentially TEMPO VR moving from Right edge to Left edge: Bank LED lights from under to above sequentially *The Slider should move smoothly and should be chec

13、ked. After finishing this test, press METRONOME and go to next test. SP-250 goes to next test automatically. LED STRINGS : ON When stepping the pedal lightly, Bank LEDs light from above to under sequentially. After completion of Pedal Check, SP-250 goes to Normal Operation automatically. REVERB/PIAN

14、O/BANK1 LEDs ON Consumption Currency should be measured under normal operation . Acceptable Range: XX.X - YY.Y mA Master VR : Max Without Sound Make ear close to L and R Speaker in order and check if abnormal noise does not come from speakers (Click Noise, Hum Noise and etc) Connect from SP250 MIDI

15、OUT to MIDI IN of another MIDI unit.by using MIDI cable. Play the SP-250 and check if the MIDI unit moves correctly. Press DEMO and check if the demo song is performed correctly. During this check, check whether output volume is changed smoothly and the feeling of movement of potentiometer is normal

16、. And check the output sound while shaking the knob of master VR to the vertical direction lightly. During Demo Performance, the unit should be shaking in order to check internal soldering. Do not drop the unit from height more than 5cm. PHONE1 plugged: In this case, no sound comes from speakers. PH

17、ONE1 unplugged: In this case, sound comes from speakers PHONE2 plugged: In this case, no sound comes from speakers. PHONE2 unplugged: In this case, sound comes from speakers FQC COMPLETION 01 Sep. 2005 Error correction / Addition of inspection item and attention SP-250 QA Full Inspection Instruction

18、 Manual (Ver.2) Sep. 01, 2005 1 MIDI cable is connected with MIDI OUT and MIDI IN to enter LOOP condition. 1 There are no abnormalities or problems on paintings and silk printings. Especially color of painting parts should be within the range of acceptance that was decided between KORG and Medeli. 2

19、 There are no abnormalities or problems of float or ETC on SWs, Jacks, Potentiometers and etc 3 Gap between Aluminum Front Bar and Point of Keybed from the lowest key to highest key should be more than 2mm. 4 Aluminum Front Bar should not be go out of Top Panel on forward. 5 There are no sink marks

20、due to bosses on Control Panel. 6 There are no convex by screws on the surface of wooden parts located next to control panel. 7 There are no waving, irregularities, paint stuck on surface/in punching holes, attachment of foreign stuffs in the appearance of the speaker net. 8 All screws of bottom sho

21、uld be screwed correctly. 9 Rubber Legs (8 pcs.) of bottom should be attached correctly. 10 Nuts should be installed correctly inside of Lower Case. Check Method: Screwing butterfly Bolts bundled with Stand into holes (2 parts) to fix stand. 11 Metal Parts as Stopper for the nuts to fix the stand fo

22、r Stopper should be assembled. 12 The extrusion Length of Key Felt from Upper Case should be 2 - 3mm from the lowest key to highest key. 13 There are no abnormalities on appearance such as Scratches, dirt and so on. 1 In silent condition, press key one by one (Middle Force) and check if strange nois

23、e or Key Mechanical noises are not come from. This test should be done while Power of Unit is OFF. *Noise from contact of adjoining keys toward pressing direction is acceptable. 1. Power ON - Normal Operation Start - Play some keys and confirm if sound comes from Speakers. 2. Repeat this method 10 t

24、imes. Even if problem happens even once, the result is NG. *This test is to avoid that Defect IC is used for production and delivered (This problem was found in Final Sample). Medeli should ask Vender to analyze the IC Defect. Depending on their reply, we will consider this method again. TEST MODE C

25、onnection: 12V direct-current power supply. POWER ON while pressing both REVERB and TRANSPOSE to enter TEST MODE. MASK ROM Check MIDI IN/OUT CHECK *Internal Check OK METRONOME LED Flashing then go to next test. *Internal Check NG Following LED flashing and stop test. MASK ROM : PIANO 1 LED Flashing

26、MIDI Loop : PIANO 2 E.PIANO2 LED Flashing After Internal Check completion, press METRONOME Button till LED HARPSI is ON. Then Press METRONOME and check the speakers. Sine Wave Output comes from in order of Left Bass Sound/Right Bass Sound/Left Treble/Right Treble (BASS : 120Hz) (Treble: 3kHZ) *The o

27、rder of output sound should be important. *Master Volume should be MAX. *There are no Vibration Noise, distortion from speakers. *Left and Right volume should be even. After finishing this test/measurement, press METRONOME and go to next test. LED VIBES ON. Pressing key from highest end key sequenti

28、ally with middle force and check if sound comes correctly. If the key is stroke correctly, the sound comes from speakers. Check it whether the sounds from L and R have the same Phase by hearing. In addition, Phase Inversion Check should be also checked. If the pressing is not admitted, the sound doe

29、s not come out. In the case of no sound, return to one octave higher key and strike and check again. If sound does not come out at the same key several times, the key is NG. After pressing final key, all LED are ON. Confirm if the all LED are ON correctly. Press METRONOME. The left end LED REVERB on

30、ly ON flashing. Press SWs from left to right sequentially. In this case, LED is also on flashing one by one. *Press SW lightly. If the sensitive is low, the SW is NG. *Adequate Click Feeling is necessary. After finishing this test, press METRONOME and go to next test. SP-250 goes to next test automa

31、tically. LED ORGAN2 : ON TEMPO VR moving from Left edge to Right edge: Bank LED lights from above to under sequentially TEMPO VR moving from Right edge to Left edge: Bank LED lights from under to above sequentially *The Slider should move smoothly and should be checked. After finishing this test, pr

32、ess METRONOME and go to next test. SP-250 goes to next test automatically. LED STRINGS : ON When stepping the pedal lightly, Bank LEDs light from above to under sequentially. After completion of Pedal Check, SP-250 goes to Normal Operation automatically. REVERB/PIANO/BANK1 LEDs ON Master VR : Max Wi

33、thout Sound Make ear close to L and R Speaker in order and check if abnormal noise does not come from speakers (Click Noise, Hum Noise and etc) Press DEMO and check if the demo song is performed correctly. During this check, check whether output volume is changed smoothly and the feeling of movement

34、 of potentiometer is normal. And check the output sound while shaking the knob of master VR to the vertical direction lightly. Connect External Monitor to LINE L/R and confirm that sound comes from External Monitor normally. PHONE1 plugged: In this case, no sound comes from speakers. PHONE1 unplugge

35、d: In this case, sound comes from speakers PHONE2 plugged: In this case, no sound comes from speakers. PHONE2 unplugged: In this case, sound comes from speakers During Demo Performance, the unit should be shaking in order to check internal soldering. Do not drop the unit from height more than 5cm. S

36、elect PIANO and BANK1. Press all keys weakly: Check if the sound comes according to adequate velocity Press all keys strongly: Check if the sound comes according to adequate velocity QA Full Inspection COMPLETION 01 Sep. 2005 Error correction / Addition of inspection item and attention SP-250 FQC In

37、struction Manual (Ver.2) Sep. 01, 2005 1 MIDI cable is connected with MIDI OUT and MIDI IN to enter LOOP condition. 2 Audio Analayzer ATS-2 : POWER ON - ENTER Inspection Program - Connection of cables 1 There are no abnormalities or problems on paintings and silk printings. Especially color of paint

38、ing parts should be within the range of acceptance that was decided between KORG and Medeli. 2 There are no abnormalities or problems of float or ETC on SWs, Jacks, Potentiometers and etc 3 Gap between Aluminum Front Bar and Point of Keybed from the lowest key to highest key should be more than 2mm.

39、 4 Aluminum Front Bar should not be go out of Top Panel on forward. 5 There are no sink marks due to bosses on Control Panel. 6 There are no convex by screws on the surface of wooden parts located next to control panel. 7 There are no waving, irregularities, paint stuck on surface/in punching holes,

40、 attachment of foreign stuffs in the appearance of the speaker net. 8 All screws of bottom should be screwed correctly. 9 Rubber Legs (8 pcs.) of bottom should be attached correctly. 10 Nuts should be installed correctly inside of Lower Case. Check Method: Screwing butterfly Bolts bundled with Stand

41、 into holes (2 parts) to fix stand. 11 Metal Parts as Stopper for the nuts to fix the stand should be assembled. 12 The extrusion Length of Key Felt from Upper Case should be 2 - 3mm from the lowest key to highest key. 13 There are no abnormalities on appearance such as Scratches, dirt and so on. 1

42、In silent condition, pressing key one by one (Middle Force) and checking if strange noise or Key Mechanical noise are not come from. This test should be done while Power of Unit is OFF. *Noise from contact of adjoining keys toward pressing direction is acceptable. 1. Power ON - Normal Operation Star

43、t - Play some keys and confirm if sound comes from Speakers. 2. Repeat this method 10 times. Even if problem happens even once, the result is NG. *This test is to avoid that Defect IC is used for production and delivered (This problem was found in Final Sample). Medeli should ask Vender to analyze t

44、he IC Defect. Depending on their reply, we will consider this method again. KORG SP-250 Parts List Part CodeParts NameLocationReferenceQTY 530000000315SP250 PIANO STAND?PART 1 530000000316SP250 MUSIC STAND,HIPS 428C 1 530000000317SP250 PEDAL 1 530000000318SP250 TOP CABINET PART FULL 1 530000000319SP

45、250 TOP CABINET PART BASIC 1 530000000320MC-500 POWER SWITCH KNOB 1 530000000321PA-50 MUSIC STAND BRACKET 2 530000000322PA-50 VOLUME SWITCH CAP 2 530000000323SP250 FUNCTION BOARD ASSYFUNCTION BRD 1 530000000324SP250 CIRCLE SILICA GEL BUTTONFUNCTION BRD 17 530000000325SP250 FUNCTION PANELFUNCTION BRD

46、 1 530000000326ROW OF LINE,16PIN 28#FROM MAIN TO FUNCTION1 530000000327SP250 AMP.BOARD ASSYAMP BOARD 1 500404000200BL02RN2R1P1AAMP BOARDL11 530000000328DC JACK DS-210 3PIN DIPAMP BOARDDJ11 530000000329STEREO JACK ST-015 4PIN DIPAMP BOARDCN4,CN52 530000000330CORE COIL,TBC-451530-20UHAMP BOARDL13,L142

47、 530000000331TR BC558C PNP TO-92 DIPAMP BOARDTR31 530000000332DIGITAL TR C114 E.S.X NPN DIPAMP BOARDTR2,TR4,TR5,TR6,TR105 530000000333TR 2SD2144S NPN BIPOLAR DIPAMP BOARDTR7-TR9,TR11-TR147 500304050240DTA114ESATPAMP BOARDTR11 500320009057NJM7805FAAMP BOARDIC41 530000000334IC REGULATOR 7809 DIP TYPEA

48、MP BOARDIC31 530000000335IC LA4708 DIP TYPEAMP BOARDIC21 510320520502NJM4556AD (D)AMP BOARDIC81 530000000336IC NJM4580 DIP8AMP BOARDIC71 530000000337IC BA3823LS ZIP TYPEAMP BOARDIC11 530000000338CHOKE COIL,PLT09H-2003R-004AMP BOARDL161 530000000339PIN(MALE),DIP 3PINS/2.54MMAMP BOARDCN11 530000000340PIN(MALE),DIP 4PINS/2.54MMAMP BOARDCN91 530000000341PIN(MALE),DIP 6PINS/2.54MMAMP BOARDCN3,CN10?CON23 530000000342PIN(MALE),DIP