Pioneer DEH-30-MP Service manual

ORDER NO.

CRT3597

DEH-30MP/XU/EW

HIGH POWER CD/MP3/WMA PLAYER WITH RDS TUNER

DEH-30MP

This service manual should be used together with the following manual(s):

Model No. Order No. Mech.Module Remarks

CX-3164 CRT3583 S10.5COMP1 CD Mech. Module : Circuit Descriptions, Mech. Descriptions, Disassembly

/XU/EW

For details, refer to "Important Check Points for Good Servicing".

PIONEER CORPORATION 4-1, Meguro 1-chome, Meguro-ku, Tokyo 153-8654, Japan

PIONEER ELECTRONICS (USA) INC. P.O. Box 1760, Long Beach, CA 90801-1760, U.S.A. PIONEER EUROPE NV Haven 1087, Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE. LTD. 253 Alexandra Road, #04-01, Singapore 159936

PIONEER CORPORATION 2005

K-ZZW. DEC. 2005 Printed in Japan

.

y

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esults.

Caution:

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SAFETY INFORMATION

This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safel

A

repair complex products such as those covered by this manual Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warrant If you are not qualified to perform the repair of this product properly and safely, you should not risk trying to do s and refer the repair to a qualified service technician.

Safety Precautions for those who Service this Unit.

When checking or adjusting the emitting power of the laser diode exercise caution in order to get safe, reliabl r

B

During repair or tests, minimum distance of 13cm from the focus lens must be kept. During repair or tests, do not view laser beam for 10 seconds or longer

- CD Section Precaution

1. You should conform to the regulations governing the product (safety, radio and noise, and other regulations), and should keep the safety during servicing by following the safety instructions

C

described in this manual.

2. Before disassembling the unit, be sure to turn off the power. Unplugging and plugging the connectors during power-on mode may damage the ICs inside the unit.

3. To protect the pickup unit from electrostatic discharge during servicing, take an appropriate treatment (shorting-solder) by referring to "the DISASSEMBLY".

4. After replacing the pickup unit, be sure to check the grating.

D

E

F

2

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DEH-30MP/XU/EW

5678

[Important Check Points for Good Servicing]

In this manual, procedures that must be performed during repairs are marked with the below symbol. Please be sure to confirm and follow these procedures.

1. Product safety

Please conform to product regulations (such as safety and radiation regulations), and maintain a safe servicing environment by following the safety instructions described in this manual.

1 Use specified parts for repair.

Use genuine parts. Be sure to use important parts for safety.

2 Do not perform modifications without proper instructions.

Please follow the specified safety methods when modification(addition/change of parts) is required due to interferences such as radio/TV interference and foreign noise.

3 Make sure the soldering of repaired locations is properly performed.

When you solder while repairing, please be sure that there are no cold solder and other debris. Soldering should be finished with the proper quantity. (Refer to the example)

4 Make sure the screws are tightly fastened.

Please be sure that all screws are fastened, and that there are no loose screws.

5 Make sure each connectors are correctly inserted.

Please be sure that all connectors are inserted, and that there are no imperfect insertion.

6 Make sure the wiring cables are set to their original state.

Please replace the wiring and cables to the original state after repairs. In addition, be sure that there are no pinched wires, etc.

7 Make sure screws and soldering scraps do not remain inside the product.

Please check that neither solder debris nor screws remain inside the product.

8 There should be no semi-broken wires, scratches, melting, etc. on the coating of the power cord.

Damaged power cords may lead to fire accidents, so please be sure that there are no damages. If you find a damaged power cord, please exchange it with a suitable one.

9 There should be no spark traces or similar marks on the power plug.

When spark traces or similar marks are found on the power supply plug, please check the connection and advise on secure connections and suitable usage. Please exchange the power cord if necessary.

0 Safe environment should be secured during servicing.

When you perform repairs, please pay attention to static electricity, furniture, household articles, etc. in order to prevent injuries. Please pay attention to your surroundings and repair safely.

A

B

C

D

2. Adjustments

To keep the original performance of the products, optimum adjustments and confirmation of characteristics within specification. Adjustments should be performed in accordance with the procedures/instructions described in this manual.

3. Lubricants, Glues, and Replacement parts

Use grease and adhesives that are equal to the specified substance. Make sure the proper amount is applied.

4. Cleaning

For parts that require cleaning, such as optical pickups, tape deck heads, lenses and mirrors used in projection monitors, proper cleaning should be performed to restore their performances.

5. Shipping mode and Shipping screws

To protect products from damages or failures during transit, the shipping mode should be set or the shipping screws should be installed before shipment. Please be sure to follow this method especially if it is specified in this manual.

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DEH-30MP/XU/EW

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1. SPECIFICATIONS

A

B

C

D

E

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DEH-30MP/XU/EW

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7

8

5

N

6

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2. EXPLODED VIEWS AND PARTS LIST

OTES : • Parts marked by " * " are generally unavailable because they are not in our Master Spare Parts List.

• The > mark found on some component parts indicates the importance of the safety factor of the part.

A

Therefore, when replacing, be sure to use parts of identical designation.

• Screw adjacent to mark on the product are used for disassembly.

• For the applying amount of lubricants or glue, follow the instructions in this manual. (In the case of no amount instructions,apply as you think it appropriate.)

2.1 PACKING

"

B

C

D

1

E

F

6

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DEH-30MP/XU/EW

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PACKING SECTION PARTS LIST

Mark No. Description Part No.

1 Accessory Assy CEA4610 2 Screw Assy CEA6002 3 Fixing Screw(M2x4) CBA1994 4 Screw CBA1650 * 5 Polyethylene Bag CEG-127

6 Screw CRZ50P090FTC 7 Screw TRZ50P080FTC * 8 Polyethylene Bag CEG-158 9 Handle CNC5395 10 Bush CNV3930

11 Carton YHG5075 12 Contain Box YHL5075

Owner's Manual,Installation Manual

Part No. Language

YRD5060 English, Spanish

YRD5061 German, French

YRD5062 Italian, Dutch, Russian

YRD5059 English, Spanish, German, French, Italian, Dutch, Russian

Mark No. Description Part No.

13 Protector YHP5009 14 Protector YHP5008 15 Polyethylene Bag CEG-162

16-1 Owner's Manual YRD5060 16-2 Owner's Manual YRD5061 16-3 Owner's Manual YRD5062 16-4 Installation Manual YRD5059 * 16-5 Passport CRY1013

* 16-6 Warranty Card CRY1157 17 Case Assy CXB3520 18 Cord Assy CDE7059

A

B

C

D

E

F

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DEH-30MP/XU/EW

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8

7

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2.2 EXTERIOR

32

39

34

41

40

33

36

C

42

35

12

9

A

17

8

18

26

8

27

30

17

37

38

42

71

24

15

A

29

46

42

31

21

43

46

19

20

A

5

45

6

57

14

46

B

53

B

51

70

48

C

56

2

D

55

53

60

69

58

59

2

10

50

52

61

66

74

64

49

47

54

3

2

16

11

16

73

73 22

63

72

62

65

67

68

28

25

B

23

1

13

E

B

44

F

8

1234

A

4

C

DEH-30MP/XU/EW

7

5678

EXTERIOR SECTION PARTS LIST

Mark No. Description Part No.

1 Screw ASZ26P050FTC 2 Screw BSZ26P060FTC 3 Screw BSZ30P060FTC 4 Screw BSZ30P200FTC 5 Cord Assy CDE7059

6 Cap CKX-003 7 Holder CNC8659 8 Earth Plate CNC8915 9 Cushion CNM8890 10 CD Mechanism Mudule(S10.5) CXK5750

11 Cable YDE5013 12 Case YNB5008 13 Insulator YNM5012 14 Panel YNS5125 15 Tuner Amp Unit YWM5113

16 Screw ASZ26P060FTC 17 Screw BPZ26P080FTC 18 Screw BSZ26P160FTC > 19 Fuse(10A) CEK1208 20 Pin Jack(CN353) CKB1051

21 Plug(CN901) CKM1376 22 Connector(CN701) CKS3834 23 Connector(CN803) CKS4944 24 Antenna Jack(CN401) CKX1056 25 Holder CND1328

26 FM/AM Tuner Unit CWE1951 27 Holder CND1054 28 JACK(CN621) YKS5001 29 Holder YNC5017 30 Heat Sink YNR5004

Mark No. Description Part No.

50 Button(EQ,BAND/ESC) YAC5075

51 Button(ATT,DISP/SCRL) YAC5076 52 Button(EJECT,TA/AF) YAC5077 53 Button(UP,DOWN) YAC5079 54 Button(DETACH) YAC5080 55 Button(LEFT,RIGHT) YAC5102

56 Spring YBH5003 57 Cover YNS5121 58 Ring YNS5123 59 Ring YNS5124 60 Lens YNV5036

61 Lens YNV5037 62 Connector(CN1801) CKS4943 63 LCD(LCD1801) YAW5064 64 Holder YNC5016 65 Sheet YNM5026

66 Cushion YNM5027 67 Connector YNV5040 68 Lighting Conductor YNV5041 69 Grille Unit YXA5143 70 Button Unit(AUDIO,FUNC) YXA5144

71 IC(IC301) PAL007B 72 IC(IC921) NJM2388F84 73 Transistor(Q702,911) 2SD2396 74 IC(IC1802) TSOP4840SB1

A

B

C

D

31 Panel Unit YXA5154 32 Button(DETACH) CAC4836 33 Spring CBH1835 34 Spring CBH2208 35 Spring CBH2367

36 Bracket CNC6791 * 37 Holder CNC8042 38 Cover CNM6276 39 Arm CNV4692 40 Arm CNV4728

* 41 Arm CNV5576 42 Screw IMS20P030FTB * 43 Panel YNS5046 44 Chassis Unit YXA5168 45 Detachable Assy YXA5169

46 Screw BPZ20P080FTB 47 Spring CBH2210 48 Knob(SOURCE,VOLUME) YAA5008 49 Button(1-6) YAC5074

56

DEH-30MP/XU/EW

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9

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2.3 CD MECHANISM MODULE

A

B

C

D

E

F

10

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DEH-30MP/XU/EW

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CD MECHANISM MODULE SECTION PARTS LIST

Mark No. Description Part No.

1 CD Core Unit(S10.5COMP1) CWX3176 2 Connector(CN101) CKS4808 3 Connector(CN901) CKS5284 4 Screw BMZ20P025FTC 5 Screw BSZ20P040FTC

6 Screw(M2 x 3) CBA1511 7 Screw(M2 x 4) CBA1835 8 Washer CBF1038 9 ••••• 10 Spring CBH2609

11 Spring CBH2612 12 Spring CBH2614 13 Spring CBH2616 14 Spring CBH2617 15 Spring CBH2620

16 Spring CBH2855 17 Spring CBH2937 18 Spring CBH2735 19 Spring CBH2854 20 Spring CBH2642

21 Spring CBH2856 22 Spring CBH2857 23 Spring CBH2860 24 Spring CBH2861 25 Spring CBL1686

26 Arm CND1909 27 Frame CND2582 28 Bracket CND2583 29 Arm CND2584 30 Lever CND2585

Mark No. Description Part No.

50 Rack CNV8342

51 Roller CNV8343 52 Holder CNV8344 53 Arm CNV8345 54 Guide CNV8347 55 Arm CNV8348

56 Arm CNV8349 57 Arm CNV8350 58 Clamper CNV8365 59 Arm CNV8386 60 Guide CNV8396

61 Arm CNV8413 62 Collar CNV8447 63 Motor Unit(M2) CXC4026 64 Arm Unit CXC4027 65 Chassis Unit CXC4028

66 Gear Unit CXC4029 67 Frame Unit CXC4031 68 Motor Unit(M1) CXC4166 69 Screw Unit CXC6359 70 Screw JFZ20P020FTC

71 Screw JGZ17P022FTC 72 Washer YE20FTC 73 Pickup Unit(P10.5)(Service) CXX1942 74 Screw IMS26P030FTC

A

B

C

D

31 Arm CND2586 32 Bracket CND2587 33 Arm CND2588 34 Lever CND2589 35 Holder CNV7201

36 Gear CNV7207 37 Gear CNV7208 38 Gear CNV7209 39 Gear CNV7210 40 Gear CNV7211

41 Gear CNV7212 42 Rack CNV7214 43 Arm CNV7216 44 Roller CNV8189 45 Gear CNV7219

46 Guide CNV7361 47 Gear CNV7595 48 Guide CNV8448 49 Arm CNV7805

56

DEH-30MP/XU/EW

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F

7

8

11

N

L S

C

6

G

K

A

K

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3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM

A

VDD5

TUNPDI

FM/AM TUNER UNIT

TUNPCK

7 6 13 5 10 9 8 11 14 18 19 20 21

NC

CE2

ROM_VDD

DI

SL

CK

CE1

LDET

TUNPDO

DO

RDS_CK

RDS_HSLK

RDS_DATA

RDS_LOCK

VDD_3.3

3.3V

VDD_3.3V VCC8

IC 5

←

5V 3.3V

IC 4

3.3V 2.5V

AUX IN

Rch

IC 2

2.5V

DET, FM MPX,

RDS DECODER

←

2.5V

5

3 2

CN621

AUX-L

KEY1

KEY2

3

NJM4558MD

IC 751

1

24

Lch

23

RDS-CK

RDS-HSL

RDS-LOC

RDS-DAT

E

TUNL

2

I

3

I

1

I

34

KEYD

94

KEYAD

IC 3 EEPROM

5.0V

OSC

IC 1

3.3V

MIXER, IF AMP

T51

AUDIOGNDNCVCC

LPF

CF52

B

ANTENNA

C

CN401

1

2

A

AM ANT

1

FM ANT

3

TUNER AMP UNIT

ATT

ANT adj

FMRF

RF adj

RFGND

OSCGND

DGND

212 1522 16 4 17

WIRED REMOTE CONTROL

D

B.UP

21

SYSTEM

CDRST

IC

PE

PICKUP UNIT (P10.5)(SERVICE)

LASER DIODE

MONITOR

DIODE

HOLOGRAM

FOCUS ACT.

TRACKING ACT.

UNIT

VREF

FOM

TOM

LD-

MD

FOP TOP

LD+

E

SPINDLE

M

MOTOR

CARRIAGE

LOAD/

MOTOR

M

F

12

1234

CD CORE UNIT(S10.5COMP1)

C

D

F,E

S905

8EJ

4

NJM2886DL3-33

V3R3D

142

LD

143

PD

133

REFOUT

DIGITAL SERVO / DATA PROCESSOR

TD,FD

12

FOM

11

FOP

14

TOP

13

TOM

BA5835FP

16

SOP

15

SOM

18

LCOP

17

LCOM

DSCSNS

IC203

CN101

15

Q101

5

REFO

88

AC,BD

FOM

33

FOP

2

TOP

1

TOM

44

14

S904 12EJ

V3R3D

+3.3V REGULATOR

IC201

UPD63763CGJ

RF-AMP,CD DECODER, MP3 , WMA, DECODER,

SD,MD

CD

DRIVER

IC301

21

41

CLCONT

22

40

LOEJ

9

47

CONT

32 31 30

42

S901

HOME

S903

1

3

DEH-30MP/XU/EW

LOCK/RFOK

56

XRST,XASTB,ADO,XCK,

XSO,XSI,WAIT,XINT

63

LOCK

/CD3VON

RESET

CLCONT

CDMUTE

LOEJ

IC701

CONT

PE5505A

CD CONTROLLER

12EJ 8EJ DSCSNS

HOME

VDCONT

CD3VON

46

VD

X1

X2

LOUT

XTAL

/XTAL

SWVDD

14 39

13

43

12

49

31

34

X201

16.93MHz

35

VDD

Q701

BRST,BRXEN,BSRQ

BDATA,BSCK

VD

X701

4.00MHz

VDCONT

CN901

LOUT

/RESET

CDMUTE

VDD

CN701

LOUT

16

11

10

8

VD

1

2

9

VDD5

11

/RESET

10

8

BRST,BRXEN,BSRQ,BDATA,BSCK

VD

1

2

VDCONT

9

Q702

Q701

34

5

2

5678

A

RDS-CK

RDS-HSLK

RDS-LOCK

RDS-DATA

ELECTRONIC VOLUME/

TUNL

2

3

1

34

KEYD

94

KEYAD

SYSTEM CONTROLLER

IC 601(2/2)

PEG159A

TUNPDO

68

LDET

75

TUNPDI

86

SL

97

TUNPCK

67

CE1

66

CE2

65

Q401

74

83

Q402

81

82

SOURCE SELECTOR

IN2−_L

IN3_L

IN1_L

IC 151

PML015A

VCK, VDT, VST

SYSPW

FRONT_L

PRE/SW_L

REAR_L

MUTE

TELIN

RESET

12

IC 961

BD4843G

12

RESET

TPDI LDET

TPDO SL TPCK TUNPCE1 TUNPCE2

SYSTEM CONTROLLER

IC 601(1/2)

PEG159A

RCK

RDS57K

RDSLOCK

RDSDT

6

12

7

53

48

38

DALMON

BSENS

ASENS

VDD5

47

19

20

B.UP

MUTE

Q453

Q451

BSENS

ASENS

VCC8

VDD_3.3V

VDD5

TUN3V REG.

NJM2885DL1-33

VDD5V REG.

Q911

BACKUP SENSE

Q931

ACC SENSE

AMP

14

FLIN

12

RLIN

22

MUTE

IC 401

Q912

VCC VCC

IC 301

PAL007B

STBY

4

ACC

20

B.REM

SYS 8V REG.

NJM2388F84

B.UP

6

FL− FL+ RL− RL+

IC 921

4

SYSPW

Q951

B.UP

CN353

2

SWL

Q351

RCFL

Q353

SUBWOOFER OUT

6

FRONT OUT

B

CN901

16

14

15 15

BREM

FL−

7

FL+

5

RL−

8

RL+

6

11

TEL

9

23 21 3 5

25

1213

B.UP

SYSPW

VDD5

BACK

GND

BACK UP

ACC

GND

FL−

FL+ RL− RL+

B.REM

RR

+

−

FR

ACC

REM

FR

+

−

B.

FL

+

−

RL

+

−

UP

C

D

B.UP

13

XOUT

X601

15

XIN

CN803

Q851

Q841

SWVDD

DSENS

ILMB+

SSENS

ROT1 ROT0

DPDT

KYDT

VDD5

Q852

7

SWVDD

18

21

CDRST

DSENS

ILMPW

SSENS

ROT1

ROT0

DPDT

KYDT

B.UP

Q842

1

92

3

4

35

36

56

CN1801

8

3

10

5

4

6 7

8

9

SWVDD

DSENS

1

ILM

6

SRC

7

ROT1

5

ROT0

4

DPDT

3

KYDT

2

D1804-D1822

S1827

4

1

2

SOURCE VOLUME

SWVDD

DEH-30MP/XU/EW

S1801 FUNC

S1806

RIGTH

S1810 DOWN

S1813 AUDIO

REM.CON.

3

IC1802

TSOP4840SB1

18

20

10 56

7

DPDT

KYDT

VLCD VDD

KEY MATRIX

S1802

S18034S1804

BAND

S1807 LEFT

S1811

S1814

1

REM

KEY CONTROLLER

UP

TA

17

KEY DATA

LCD DRIVER/

IC 1801

PD6340A

S1808

S1815

DISP

1

3

KEYBOARD UNIT

B

S1805

2

S18185S1809

6

S1812

EQ

S1817

S1816

ATT

EJECT

22

XO

X1801 5MHz

23

XI

LCD1801

8

E

F

13

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3.2 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)

Note: When ordering service parts, be sure to refer to " EXPLODED VIEWS AND PARTS LIST" or "ELECTRICAL PARTS LIST".

A

Large size

A-b

SCH diagram

Guide page

FM : -20dBs AM : -20dBs

A-a A-b

A-a

C

CN901

A-b

Detailed page

471/16

CD : 0.35dBs

FM/AM TUNER UNIT

ANTENNA

A-a

B

C

15.000MHz

AUX IN

AUX : 2.21dBs

SYSTEM MICROCOMPUTER

D

WIRED REMOTE CONTROL

E

B

CN1801

F

14

A

DEH-30MP/XU/EW

1234

5678

A

A-b

TUNER AMP UNIT

A

PRE-SUB WOOFER

OUTPUT

B

OMPUTER

FM : -2.9dBs AM : -2.9dBs CD : 10.45dBs AUX : 10.31dBs

471/16

>

3A

332/16

FM : 23.1dBs AM : 23.1dBs CD : 36.45dBs AUX : 36.31dBs

600µH

PRE-FRO

TPU

U

O

CEK1208

T

N

T

C

>

BACKUP

10A

GND

ACC

B.REM

TEL

RL–

FL–

RL+

FL+

RR–

FR–

RR+

FR+

D

NOTE :

Symbol indicates a resistor. No differentiation is made between chip resistors and discrete resistors.

Symbol indicates a capacitor. No differentiation is made between chip capacitors and discrete capacitors.

The > mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation.

For resistors and capacitors in the circuit diagrams, their resistance values or capacitance values are expressed in codes:

Ex. *Resistors Code Practical value 123 12k ohms 103 10k ohms

*Capacitors Code Practical value 103 0.01uF 101/10 100uF/10V

DEH-30MP/XU/EW

56

E

RR

+

B.

REM

ACC

FR

+

FL

+

RL

-

F

+

BACK

UP

GND

A

7

8

15

E

FAC

A

1234

A

B

C

A-b

CN901

C

471/16

CD : 0.35dBs

1

2

15.000MHz

SYSTEM MICROCOMPUTER

A-b

A-a

D

E

FM : -20dBs

AM : -20dBs

ANTENNA

F

A-a

16

FM/AM TUNER UNIT

DEH-30MP/XU/EW

1234

AUX : 2.21dBs

AUX IN

MOTE CONTROL

O

5678

A

3 4 5 6 7 8

A-b

B

CN1801

A-b

A-a

C

D

E

F

WIRED REMOTE CONTR

A-a

56

DEH-30MP/XU/EW

7

8

17

1234

GND

>

BACKUP

10A

CEK1208

600µH

A

OUTPUT

PRE-SUB WOOFER

B

PRE-FRONT

3A

>

332/16

B.REM

ACC

TUNER AMP UNIT

A

C

A-b

A-a

D

E

F

A-b

18

FM : -2.9dBs

AM : -2.9dBs

CD : 10.45dBs

AUX : 10.31dBs

1

2

DEH-30MP/XU/EW

1234

BACKUP

CEK1208

5678

600µH

10A

GND

FL

B.

+

-

REM

RL

ACC

GND

+

-

A

B

+

FR

B.REM

ACC

TEL

FL–

RL+

RL–

471/16

FL+

FR–

FR+

RR+

RR–

FM : 23.1dBs

AM : 23.1dBs

CD : 36.45dBs

AUX : 36.31dBs

RR

-

FR

UP

BACK

C

For resistors and capacitors in the circuit diagrams, their resistance

values or capacitance values are expressed in codes:

Ex. *Resistors

Code Practical value

123 12k ohms

103 10k ohms

*Capacitors

Code Practical value

103 0.01uF

101/10 100uF/10V

A-b

A-a

D

Symbol indicates a resistor.

No differentiation is made between chip resistors and

discrete resistors.

Symbol indicates a capacitor.

No differentiation is made between chip capacitors and

discrete capacitors.

The > mark found on some component parts indicates

the importance of the safety factor of the part.

Therefore, when replacing, be sure to use parts of

NOTE :

identical designation.

E

3 4 5 6 7 8

56

DEH-30MP/XU/EW

7

8

F

A-b

19

1234

3.3 KEYBOARD UNIT

A

B

C

5.00MHz

LCD DRIVER

D

E

F

B

20

1234

DEH-30MP/XU/EW

5678

A

KEYBOARD UNIT

B

A

CN803

C

D

E

56

DEH-30MP/XU/EW

F

B

7

8

21

Pioneer DEH-30-MP Service manual

SAFETY INFORMATION

CONTENTS

1. SPECIFICATIONS

2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

2.2 EXTERIOR

2.3 CD MECHANISM MODULE

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM

3.2 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)

3.3 KEYBOARD UNIT