KORG IS40, IS50 Service Manual

iS40
iS50

Interactive
Music
Workstation

Service Manual

Specifications

Features iS40 iS50

Keyboard 61 notes with velocity and aftertouch 61 notes with velocity
Generation system AI
Tone generator 32 voices, 32 oscillators
Waveform memory 14MB PCM ROM 12MB PCM ROM
Effects 2 stereo digital multi-effect systems, 47 effects - Edit effects
Programs 320 programs (including GM programs) + 14 drum kits + 64 user programs + 2 user drum kits
Styles 128 styles + 16 user styles
Arrangements 128 arrangements + 64 user arrangements
Keyboard set 15 -­Song Midi file player format 0 and 1 (16 tracks), GM compatible
Backing sequence 10, stored in RAM (40,000 events)

2

Synthesis System

Control inputs Damper Pedal, Assignable Pedal/Switch, EC5 Assignable Pedal /Switch
Audio outputs Left/Mono, Right
Audio inputs Left/Mono, Right --

MIDI

Floppy Disk 3.5 inch 2DD/2HD (IBM PC 1.44 MB)
Display Backlit custom LCD
Main Amplifier 2 x 14watt 2 x 8 watt

Speakers 4 speakers (in Bass Reflex Box)

Controls Joystick, Dial Joystick
Aftertouch Yes -­Dimensions (W x D x H) 1110 x 386 x 142 mm (43.7 x 15.1 x 5.6inch) without music rest
Weight 12,9 kg (28.4 lbs) 11,5 kg (25.3 lbs)

In, Out, Thru + PC interface (PC T O HOST) IBM

PC and Macintosh compatible

In, Out

2 speakers (dual concentric speakers in Bass

Reflex Box)

* Specifications and design are subject to change without notice for the purpose of product enhancement.

Test Mode

* Operating Specifications for test mode *

Fig.1: Standard Setup

• Press one of the following combinations of switches, and then turn the power switch on. This makes the test mode start.
GLOBAL + ARR. PLAY: Ordinary test

GLOBAL + SONG PLAY: Test mode excluding the Internal test

• Switches to be used in test mode:
CURSOR > : Go to the next test step

PROGRAM 8 : Go to the next test step (iS50)
KEYBOARD SET 5 : Go to the next test step (iS40)
CURSOR < : Return to the previous test step
PAGE + : Go to the next test item
PAGE - : Return to the previous test item

* Floppy disk drive test *

The number shows the type of a happened error.
0: OK

1: Drive not Ready
2: Data Error
3: Verify Error
4: No File
5: Same File
7: Disk Full
10: Soft Protect
12: Hard Protect
17: Disk Type
18: Media Type

• Turn the power switch ON by pressing [GLOBAL] and [SONG PLAY] simultaneously.

• Press [PAGE -].

• Insert the test disk (a 2HD disk formatted with iS40) and press [PROGRAM 1] to start the test.

• When [PROGRAM 2] is pressed, a checking disk format type will be skipped, but the test can be continued even using
an unformatted disk.

* Internal test *

• Turn the power switch ON by pressing [GLOBAL] and [ARR.PLAY] simultaneously.

• Hook up all the terminals for INPUT L/MONO, INPUT R, OUTPUT L/MONO, OUTPUT R, MIDI IN, MIDI OUT,
ASSIGNABLE, (MIDI THRU, TO HOST, PEDAL SW, EC5 only on iS40) with the plug inserted.

1. System ROM Check

1.1. Checksum test

2. Flash ROM Check

2.1.Write/Read check (before preload from disk) -

2.2.Checksum test

3. Internal RAM Check

3.1. 00000h~3FFFFh

3.2. 40000h~7FFFFh

4. LCD RAM Check

4.1. Write/Read check

5. FPS I/F Check

5.1. Communication command Send & Receive

6. FKS I/F Check

6.1. Communication command Send & Receive

7. TGL I/F Check

7.1. All voices on/off check, TGL voice flag

7.2. VDA & VDF register Write/Read

8. MIDI loop back Check

8.1. Check MIDI OUT/IN data (Check MIDI THRU data only on iS40)

9. PC I/F Check (only on iS40) -

9.1. Check PCIF OUT/IN data

10. PCM Verification

10.1 Data bus check

10.2. Address bus check BANK 0&1 PCM

10.3. Address bus check BANK 2&3 PCM

10.4. Address bus check BANK 4&5 PCM

10.5. Address bus check BANK 6&7 PCM (only iS40)

11. Style Verification

11.1. Data bus check

11.2. Address bus check

12. HeadPhone Check
Check headphone connection

* External test *

1. Key Type check
Check keyboard type

iS40 = TP9
iS50 = TP7

2. PCI (TO HOST) Clock out check (only iS40)

2.1. Check that the output clock is 995k ~ 1,005kHz with a universal counter.

995.000 kHz ≤ clock ≤ 1005.000 kHz

[CURSOR >]

3. Panel Switch & LED

3.1. Check that all the LEDs are lit
Insert the preload disk (a 2DD disk) to the FDD, and check that the access lamp is lit.
Eject the disk.
Insert the preload disk again to preload the background.

[CURSOR >]

3.2. Check that all the LEDs are lit

ARR_PLAY B_SEQ SMF_PLAY SONG_EDIT
GLOBAL PROG CHORD_HOLD SOUND_HOLD
B_INVERSION SPLIT_POINT TEMPO_LOCK SINGLE_TCH
ARR_BANK_A ARR_BANK_B ARR_BANK_U ARR_1
ARR_2 ARR_3 ARR_4 ARR_5
ARR_6 ARR_7 ARR_8 FADE_INOUT
VARIATION1 VARIATION2 VARIATION3 VARIATION4
FILL1 FILL2 INTRO_ENDING1 INTRO_ENDING2
DRUM_UP PERC_UP BASS_UP ACC1_UP
ACC2_UP ACC3_UP KBD1_UP KBD2_UP
DRUM_DOWN PERC_DOWN BASS_DOWN ACC1_DOWN
ACC2_DOWN ACC3_DOWN KBD2_DOWN KBD1_DOWN
TR_SELECT RESET TAP TEMPO (iS40) START_STOP(G)
START_STOP(R) SYNC_START (iS40) SYNC_STOP REC_WRITE
PAGE - PAGE + CURSOR < CURSOR >
TEMPO/VALUE - TEMPO/VALUE + EXIT/NO ENTER/YES
TRANSPOSE b TRANSPOSE # OCTAVE_DOWN OCTAVE_UP
CHORD SCAN LOW CHORD SCAN UP KEY ASS LOW KEY ASS UP2
KEY ASS UP1 ENSEMBLE SUSTAIN KB MODE M.DRUM
KB MODE SPLIT KB MODE FULL PROG BANK A PROG BANK B
PROG BANK C PROG BANK D PROG BANK E PROG BANK F
PROG 1 PROG 2 PROG 3 PROG 4
PROG 5 PROG 6 PROG 7 PROG 8

(iS40 only)
KB SET BANK A KB SET BANK B KB SET BANK C KB SET 1
KB SET 2 KB SET 3 KB SET 4 KB SET 5

[CURSOR >]

4. LCD Check

4.1. Check that all the segments of the LCD are lit and the back light lamps are lit. (See Fig.2)

Fig.2: LCD Display

[CURSOR >]

4.2. Check that the LCD screen is completely blank.

[CURSOR >]

5. MDE Check

* Set the master volume at middle.
OSCILLOSCOPE 1V/DIV, 2mS/DIV, DC

5.1. Check that the waveform from the OUTPUT L/MONO is normal (see Fig.3). Observe for a 2sec.

Fig.3: Waveform

[CURSOR >]

5.2. Check that the output waveform level is 0 with an oscilloscope.

[CURSOR >]

5.3. Check that the waveform at the OUTPUT L/MONO is normal (see Fig.3). Observe for a 2sec.

[CURSOR >]

6. LINE IN Check (only iS40)

* Set the master volume at MAX.
OSCILLOSCOPE 1V/DIV, 0.2mS/DIV, DC

6.1. Put a signal (1kHz/-10dBu sin waveform) into the INPUT L/MONO, and measure the output level of OUTPUT

L/MONO. Check that the waveform according to the test range indicated in the table below and the output frequency is
normal. Check that the observed waveform is normal without distortion.

[CURSOR >]

6.2. Test INPUT R - OUTPUT R likewise.

OUTPUT L/MONO: 1kHz, 3.9dBu ≤ level ≤ 7.9dBu
OUTPUT R: 1kHz, 3.9dBu ≤ level ≤ 7.9dBu

[CURSOR >]

7. Level Check

* Set the master volume at MAX.
Measure the level at the PHONE L and PHONE R under a load of 33 ohms.
OSCILLOSCOPE 1V/DIV, 0.5mS/DIV, DC

7.1. Check that the level is within the test range indicated in the table below and the output frequency is normal.
Check that the observed wave form is normal without distortion.

7.2. Check likewise OUTPUT R,PHONE L and PHONE R.
OUTPUT L/MONO: 488Hz, 7.3dBu ≤ level ≤ 9.5dBu

[CURSOR >]

OUTPUT R: 412Hz, 7.3dBu ≤ level ≤ 9.5dBu

[CURSOR >]

Headphone L: 549Hz, 2.4dBu ≤ level ≤ 4.6dBu (1 V RMS ≤ level ≤ 1.3 V RMS)

[CURSOR >]

Headphone R: 610Hz, 2.4dBu ≤ level ≤ 4.6dBu (1 V RMS ≤ level ≤ 1.3 V RMS)

[CURSOR >]

8. Noise Check
* Set the master volume at MAX.

OSCILLOSCOPE 1V/DIV, 0.5mS/DIV, DC

8.1. Measure the noise level of OUTPUT L/MONO. Check that the level is within the test range indicated
in the table below. Check that the output wave form level is 0 with an oscilloscope.

8.2. Check likewise OUTPUT R, PHONE L and PHONE R.
OUTPUT L/MONO: level ≤ -84dBu

[CURSOR >]

OUTPUT R : level ≤ -84dBu

[CURSOR >]

Headphone L : level ≤ -88dBu

[CURSOR >]

Headphone R : level ≤ -88dBu

[CURSOR >]

9. Speaker Check

9.1. Check the sound from the middle range speaker L.
Check that the output sound has no distortion, also check that no sound comes out from the middle range
speaker R.

[CURSOR >]

9.2. Check the middle range speaker R, the tweeter L and the tweeter R likewise.

10. A/D converter
* Pay attention not to touch the joystick when starting this test.

10.1. Rotary Encoder (only iS40)

10.1.1.• Turn the rotary encoder and set the finger hook to the top position

• Slowly turn the rotary encoder clockwise four (4) times.

• When the fourth (4th) tern is completed (the finger hook is positioned at the top), check that
"|****0" appears.

10.1.2. • Slowly turn the rotary encoder clockwise four (4) times.

• When the fourth (4th) left tern is completed (the finger hook positioned at the top), check that "0****|" appears.

[CURSOR >]

10.2. Acc Slider VR
Move the ACC slider from MIN to MAX and check that the maximum and minimum value
00 to 7F appears. “0” will appear when the value reaches MAX and /or MIN.

10.3. Joystick X (Left/Right test: horizontal movement) ( ↔ )

This indication appears when reaching the maximum (minimum) value.

[CURSOR >]

10.4. Joystick Y (Up/Down test: vertical movement) ( ↕ )

This indication appears when reaching the maximum (minimum) value.

[CURSOR >]

10.5. Assignable Pedal

Operate respectively from MIN to MAX and check that the maximum and minimum values (00 to 7F) appear.
When the value reaches MAX and MIN, “0” will appear.

10.6. EC5 (A, B, C, D, E) & Damper pedal (only iS40)
Press the A to E (EC5) ON and OFF individually, turn up and down Damper pedal, and check that “0” appears.

10.7. After Touch (only iS40)
Hit D#4 key and check that the value changes smoothly. It reaches 7F when pressed strongly.

Hit C2 key and check that the value changes smoothly. It reaches 7F when pressed strongly.
Hit C7 key and check that the value changes smoothly. It reaches 7F when pressed strongly.

11. Keyboard

• Hit the keyboard from the highest key to the lowest, and check that the note hit is indicated on the LCD screen.

• The velocity value must be within the range from 43 to 73 in order to proceed to the next key.

• When the lowest key was hit, press it for the next step.

12. Preload and 2DD mode disk check

• If there is the background preload error, retry the preload.

• When the preload data were loaded, check that the screen displays “ARR: ”.

• Press the C3key, then press [Start/Stop] to check the playing.

• Move Master Volume from MAX to MIN and check that the output sound changes smoothly without noise.

• Withdraw the disk and the cables, and turn the power switch OFF for the test.

PART LIST (for iS40 and iS50 unless utherwise specified)

Qty Code Description NOTE

1 GRA0002001 PCB ASSEMBLY KIP-2001 PANEL BOARD iS40
1 GRA1002001 PCB ASSEMBLY KIP-2001 PANEL BOARD iS50
1 GRA0002002 PCB ASSEMBLY KIP-2002 POWER AMPL. iS40
1 GRA1002002 PCB ASSEMBLY KIP-2002 POWER AMPL. iS50
1 GRA0002003 PCB ASSEMBLY KIP-2003 MAIN FILTER
1 GRA0002004 PCB ASSEMBLY KIP-2004 POTENTIOMETER
1 GRA0002005 PCB ASSEMBLY KIP-2005 ROTARY ENCODER iS40
1 GRA0002006 PCB ASSEMBLY KIP-2006 AFTER TOUCH iS40
1 GRA0002044 PCB ASSEMBLY KIP-2044 MAIN BOARD iS40
1 GRA1002044 PCB ASSEMBLY KIP-2044 MAIN BOARD iS50

Part list PANEL PCB KIP-2001 for iS40 (GRA0002001) and iS50 (GRA1002001)

Qty

Qty

kit1

kit2

iS40

iS50

1 1 LED0005002 DL33 Bicolor LED 3mm (Red

1 1 QUA0005001 X1 10.0MHz ceramic res. W/C
34 30 LED0005001 DL1-32 DL34-35 (kit2:

Code Reference Description

Green)

LED 2mm H=4mm

DL1-25 DL30-32 DL34-

35)

1 1 CIN0001001 U1 Panel scan IC MB89635
5 5 TRS0001001 Q1-4 Q15 NPN DIG.TR RN1202
10 10 TRS0001002 Q5-14 PNP DIGI.TR RN2202
97 89 INT0001008 SW1-97 T .S. T=0.2H=5 F=160
1 1 PLA0001045 BICOLOR LED SUPPORT
1 1 CST0001009 KIP-2001 PCB

Part list POWER AMP PCB KIP-2002

Qty Code Reference Description

2 DIX0005001 D1-2 GBU8D BRIDGE RECT.
2 DIX0005002 D3-4 RECT. DIODE 1N4002.
4 FUS0005060 F1-2 FUSE CLIPS 5X20
1 CIN0001003 U4 3 BAND GRAF EQ.M5243
1 TRS0001004 U1 POS REG..5V 2A PQ05RF21
1 TRS0001005 U2 POS REG..9V 1A PQ09RF1
1 TRS0001003 U3 POWER AMPLF.2X15W TDA8560
2 TRS0001001 Q1-2 NPN DIG TRANSISTOR RN1202
1 FUS0005021

FUS0005039F1F1

1 FUS0005022

FUS0005040F2F2

1 CST0001010 KIP-2002 PCB

Part list MAIN FILTER PCB. KIP-2003 (GRA0002003)

Qty Code Reference Description

4 BOB0005001 L300-303 EMI SUPP. COIL
1 FUS0005011

FUS0005032
1 INT0001007 MSW300 MAIN SW. SDDFC3
1 FUS0005060 CLIPS 5X20 FUSES
1 CST0001011 PCB KIP-2003

F300
F300

FUSE T3.15A 250V
FUSE 3A 125V
FUSE T4A 250V
FUSE 4A 125V

315mA 250V fuse
750mA 125V fuse

Part list ROTARY ENCODER PCB KIP-2005 for iS40 (GRA0002005)

Qty Code Reference Description

1 INT0001006 RE500 ROT. ENC. EC16B
1 CST0001012 PCB KIP-2005

Part list SLIDE POTENTIOMETER PCB KIP-2004 (GRA0002004)

Qty Code Reference Description

1 POT0001003 VR400 SLID.POT. 10KX2 W D.C.
1 POT0001004 VR401 SLID.POT.10KX1 W D.C.
1 CST0001013 PCB KIP-2004

Part list MAIN BOARD PCB KLM-2044 for iS40 (GRA0002044) and iS50 (GRA1002044)
Qty
KIT2
iS50

2 2 219401400 EMI FILTER SDST310 92D223S50
39 53 40400500 CHIP INDUCTOR SBLM21B102SPT
1 1 304000070 TRANSISTOR2SA812-T1B (M5-7)
6 6 304020230 TRANSISTOR 2SC3661-TA/TB (3K)
1 1 304030140 COMPOUND TRANSISTOR FN1A4M-T1B
1 1 304050120 COMPOUND TRANSISTOR FP1A4M-T1B
1 1 314001400 DIODE RLS-73 TE-11
1 9 315000500 W DIODE MC-2840-T12-1
1 1 314029300 ZENER DIODE HZK5A
1 1 320001529 IC(MAIN CPU) uPD70433GD-16-5BB (V55PI)
1 1 320003217 IC(KEYSCAN) TMP87C847U-4458
1 1 320004538 IC(FDC) HD63266F
1 1 320012181 IC(TGL2A) MB87A104APF-G-BND
1 1 320012216 IC(SYSTEM) MBM29F400BA-90(9709**)
1 1 320004029 IC(STYLE) MX23C1610PC-10-STY is V11
0 0 320006038 IC(STYLE) MSM27C1602CZ-NRS(9708**)
1 1 320012216 IC(BACK UP) MBM29F400BA-90
1 1 320040017 IC(PCM1) MX23C3210MC-15 X790ROMA
1 1 320040018 IC(PCM2 MX23C3210MC-15 X790ROMB
1 1 320040019 IC(PCM3) MX23C3210MC-15 X790ROMC
0 1 320040019 IC(PCM4) MX23C1610MC-15 X790ROMD
1 1 320043002 IC(4x64K DRAM) uPD41464CF-10
0 0 320043001 IC(4x256KDRAM) IN41464P-10
1 1 324005003 IC(16x64KDRAM) LC321664BJ-10/80
0 0 324003006 IC(16x64KDRAM) TC511664A-80J (Substitution)
0 0 324006001 IC(16x64KDRAM) MSM51166AJ-80-TRM

1 1 324011035 IC(256Kx16DRAM) M5M44170CJ-7 L2
1 1 324003010 IC(LOGIC) TC7WU04F
2 2 324004003 IC(LOGIC) HD74HC139FPER
0 0 324004006 IC(LOGIC) HD74HC00FPER
2 2 324004007 IC(LOGIC) HD74HC573FPER
1 1 324004012 IC(LOGIC) HD74HC08FPER
1 1 324004050 IC(LOGIC) HD74HC138FPER
3 3 324004059 IC(LOGIC) HC74HC157FPER
1 1 324004176 IC(LOGIC) HD74HC05FPER
2 2 324001016 IC(OP-AMP)uPC4574G
1 1 324011004 IC(OP-AMP)M5216FP-600C
1 1 324009004 IC(REG) NJM78L05UA-TE2
2 2 324009019 IC(OP-AMP)NJM2115M-TE2
1 1 324011012 IC(RESET) M51953BFP-600C
0 1 324011021 IC(PC I/F) M5M34050FP-42A
1 1 324038002 IC(DAC) TDA1305T/N2-T

Qty
Kit1
iS40

Code Parts name

(Substitution)

1 1 334000600 PC PC-410K
1 1 335400128 X-TAL SMD49 32MHz
1 1 335400117 CERAMIC RESONATOR CSTCS8.00MT-TC
1 1 343020440 PCB KLM-2044

Other Erectric Parts

Qty
KIT2
iS50

1 1 FDD0002001 CUSTOM LCD ASSEMBLY
1 1 FDD0001003 JOYSTICK ASSEMBLY
1 1 FDD0001001 LOW NOISE F.D.D.
0 1 TAS0001004 61 KEY TP9 FATAR KEYBOARD WITH A. TOUCH
1 0 TAS0001005 61 KEY TP7 FATAR KEYBOARD
1 0 TRA0001004 POWER TRANSFORMER 38VA
0 1 TRA0001003 POWER TRANSFORMER 50VA
0 2 ALT0001004 WOOFER SPEAKER 104MM
0 2 ALT0001005 TWEETER SPEAKER 50MM
2 0 ALT0001006 DUAL CONE 104MM SPEAKER

1
1
1
1 1 FDD0001004 ACCESSORY DISK

Qty
Kit1
iS40

1
1
1

Parts Code Parts name

AC MAINS CORDS
RIL0001040
RIL0001071
RIL0001072

EU

US

UK

Address

KORG ITALY Spa
Via Cagiata, 85
I-60027 Osimo (An)
Italy

Web servers

www.korg.it
www.korg.net
www.korg.com

PART CODE: MAN0001030