Pioneer KEHM-8027-ZT, KEHM-8127-ZT Service manual

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

C PIONEER CORPORATION 2002

K-ZZB. JUNE 2002 Printed in Japan

AUDIO SYSTEM HEAD UNIT

KEH-M8027ZT XN/ES

VEHICLE DESTINATION PRODUCED AFTER PART No. ID No. PIONEER MODEL No.
CAMRY MIDDLE EAST August 2002 86120-YC270 P7406 KEH-M8027ZT/XN/ES
CAMRY MIDDLE EAST August 2002 86120-YC280 P7407 KEH-M8127ZT/XN/ES

- This service manual should be used together with the manual(s) listed below.
For the parts numbers, adjustments, etc. which are not shown in this manual, refer to the following
manual(s).

Model No. Order No. Mech. Module Remarks
CX-1011 CRT2406 3L Cassette Mech. Module:Mech.Description, Disassembly, Adjustment

- Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.

For details, refer to "Important symbols for good services".

ORDER NO.

CRT2842

TOYOTA

KEH-M8127

ZT XN/ES

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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 safely 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 warranty.
If you are not qualified to perform the repair of this product properly and safely; you should not risk trying to do so
and refer the repair to a qualified service technician.

[ Important symbols for good services ]

In this manual, the symbols shown-below indicate that adjustments, settings or cleaning should be made securely.
When you find the procedures bearing any of the symbols, be sure to fulfill them:

2. Adjustments

To keep the original performances of the product, optimum adjustments or specification confirmation is indispensable.
In accordance with the procedures or instructions described in this manual, adjustments should be performed.

3. Cleaning

For optical pickups, tape-deck heads, lenses and mirrors used in projection monitors, and other parts requiring cleaning,
proper cleaning should be performed to restore their performances.

5. Lubricants, glues, and replacement parts

Appropriately applying grease or glue can maintain the product performances. But improper lubrication or applying
glue may lead to failures or troubles in the product. By following the instructions in this manual, be sure to apply the
prescribed grease or glue to proper portions by the appropriate amount.For replacement parts or tools, the prescribed
ones should be used.

4. Shipping mode and shipping screws

To protect the product from damages or failures that may be caused during transit, the shipping mode should be set or
the shipping screws should be installed before shipping out in accordance with this manual, if necessary.

1. Product safety

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 described in this manual.

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CONTENTS

SAFETY INFORMATION ............................................2

1. SPECIFICATIONS........................................................4

2. EXPLODED VIEWS AND PARTS LIST.......................5

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM...10

4. PCB CONNECTION DIAGRAM ................................22

5. ELECTRICAL PARTS LIST ........................................29

6. ADJUSTMENT..........................................................34

7. GENERAL INFORMATION .......................................39

7.1 DIAGNOSIS ........................................................39

7.1.1 DISASSEMBLY .........................................39

7.1.2 CONNECTOR FUNCTION DESCRIPTION.......41

7.2 PARTS .................................................................42

7.2.1 IC................................................................42

7.2.2 DISPLAY....................................................45

7.3 OPERATIONAL FLOW CHART...........................46

7.4 CLEANING ..........................................................47

8. OPERATIONS............................................................34

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1 SPECIFICATIONS

Power source.................13.2V(10.5V-16.0V allowable) DC

Backup current.................................................1mA or less

Grounding system........................................Negative type

Dimensions................................200(W)x70(H)x165(D)mm

Weight......................................................................1.285kg

Cassette player

Tape................................Compact cassette tape(C30-C90)

Tape speed ......4.76 cm/sec.(+0.14 cm/sec.,-0.05 cm/sec.)

Wow and flutter.................................0.2% or less(WRMS)

Crosstalk........................................................40dB or more

Separation.....................................................30dB or more

S/N .................................................................40dB or more

Distortion.............................................................3% or less

CD (AVC-LAN)

S/N .................................................................70dB or more

Distortion..........................................................0.3% or less

Separation.....................................................60dB or more

FM tuner

Frequency...................................................87.5–108.0 MHz

S/N 30dB usable sens.................................14dBuV or less

Distortion(30% MOD.) .....................................1.5% or less

IF interference ...............................................64dB or more

Image interference........................................35dB or more

AM tuner

Frequency...................................................531–1602 kMHz

AGC sens. ......................................................20dBuV ±7dB

S/N 20dB usable sens.................................35dBuV or less

IF interference ...............................................40dB or more

Image interference........................................45dB or more

Distortion(30% MOD.) .....................................1.5% or less

SW1 tuner (KEH-M8127ZT/XN/ES)

Frequency...............................................2,940–4,215 kMHz

...............................................4,540–5,175 kMHz

...............................................5,820–6,455 kMHz

...............................................7,100–7,735 kMHz

AGC sens. A...................................................20dBuV ±7dB

S/N 20dB usable sens.................................40dBuV or less

IF interference ...............................................40dB or more

Image interference........................................45dB or more

Distortion(30% MOD.) .....................................1.5% or less

SW2 tuner (KEH-M8127ZT/XN/ES)

Frequency.............................................9,500–10,135 kMHz

...........................................11,580–12,215 kMHz

...........................................15,100–15,735 kMHz

...........................................17,500–18,135 kMHz

...........................................21,340–21,975 kMHz

AGC sens. A.................................................20dBuV ±10dB

S/N 20dB usable sens.................................40dBuV or less

IF interference (A) .........................................25dB or more

Image interference (C)..................................25dB or more

Distortion(30% MOD.) .....................................2.5% or less

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2. EXPLODED VIEWS AND PARTS LIST

2.1 PACKING

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1 Polyethylene Bag CEG1042
2 Contain Box(M8027ZT) CHL4669

Contain Box(M8127ZT) CHL4670
3 Protector CHP2545
4 Protector CHP2544

5 Protector CHP2543
6 Protector CHP2542
7 Cover CEG1057

- PACKING SECTION PARTS LIST

Mark No. Description Part No.

Mark No. Description Part No.

NOTE:

- Parts marked by “*” are generally unavailable because they are not in our Master Spare Parts List.

- Screws 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.)

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2.2 EXTERIOR

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1 Keyboard Unit CWM8359
2 LCD(LCD901) CAW1694
3 Connector(CN901) CKS4256
4 Holder CNC9543
5 Spacer CNM7828

6 Sheet CNM7880
7 Rubber CNV6820
8 Lighting Conductor CNV6821
9 Connector CNV7240

10 Grille Unit(M8027ZT) CXB7676

Grille Unit(M8127ZT) CXB7677

11 Knob Unit(VOL) CXB7678
12 Knob Unit(TUNE) CXB7679
13

Cassette Mechanism ModuleEXK4285

14 Screw ISS26P055FUC
15 Screw ASZ26P140FMC

16 Screw BMZ30P100FMC
17 Screw BSZ26P050FMC
18 Transistor(Q471,761) 2SB1185
19 Case CNB2754
20 Frame CNC9544

21 Earth CNC9555

* 22 Cushion CNM5281

23 Insulator CNM7401
24 Insulator CNM7436
25 Insulator CNM7437

26 Spacer CNM7755
27 Heat Sink CNR1613
28 Main Unit(M8027ZT) CWM8358

Main Unit(M8127ZT) CWM8360

29 Screw BMZ30P060FMC

30 Screw(M3x8) CBA1339
31 Plug(CN402) CKM1221
32 Connector(CN401) CKM1222
33 Connector(CN701) CKS3568
34 Connector(CN601) CKS4557

35 86146-48030(CN501) CKX1057
36 Holder CNC9545
37 Holder CNC9546
38

FM/AM Tuner Unit(M8027ZT)CWE1557
FM/AM Tuner Unit(M8127ZT)CWE1556

39 Holder CNC8855
40 Terminal(CN403) VNF1084
41 Terminal(CN404) VNF1084
42 Chassis Unit CXB7680
43 Screw BPZ20P060FMC

44 Button(SCAN) CAC7130
45 Button(AM)(M8027ZT) CAC7131

Button

(AM•FM)(M8127ZT)

CAC7134

46 Button(FM1•2)(M8027ZT) CAC7132

Button(SW1•2)(M8127ZT) CAC7135

47 Button(TAPE) CAC7133
48 Button(EJECT) CAC7136
49 Button(CD) CAC7137
50 Button( , ) CAC7138
51 Button(1-6) CAC7139

52 Door CAT2259
53 Spring CBH2538
54 Lighting Conductor CNV6817
55 Lighting Conductor CNV6818
56 Holder CNV6819

57 Lighting Conductor CNV6829
58 Holder CNV6976
59 Holder CNV7285
60 IC(IC201) TDA7384

- EXTERIOR SECTION PARTS LIST

Mark No. Description Part No.

Mark No. Description Part No.

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2.2 CASSETTE MECHANISM MODULE

C

D

For grease application, refer to the service manual for CX-1011 (CRT2406).

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Mark No. Description Part No. Mark No. Description Part No.

1 Screw BSZ20P040FMC
2 Washer CBF1037
3 Washer CBG1003
4 Screw EBA1028
5 Screw CBA1037

6 Spring EBH1653
7 Spring EBH1642
8 Spring EBH1641
9 Spring EBH1626

10 Spring EBH1627

11 Spring EBH1648
12 Cord EDD1024
13 Photo-reflector(Q101) EGN1004
14 Arm ENC1526

* 15 Lever ENC1544

16 Lever ENC1531
17 Arm ENC1532
18 Frame ENC1533
19 Holder ENC1534
20 Gear ENC1535

21 Arm ENC1550
22 Roller ENR1040
23 Belt ENT1027
24 Collar ENV1508
25 Arm ENV1539

26 Arm ENV1540
27 Gear ENV1569
28 Gear ENV1547
29 Gear ENV1560
30 Worm Wheel ENV1566

31 Lever ENV1551
32 Flywheel ENV1554
33 Gathering PCB ENX1073
34 Switch(S101,102,103) ESG1007
35 Deck Unit EWM1033

36 Plug(CN251) CKS3540
37 Gathering PCB ENX1067
38 Motor Unit(M1) EXA1491
39 Motor EXM1028
40 Head Assy(HD1) EXA1639

41 •••••
42 Screw BMZ20P022FMC
43 Bracket ENC1558
44 Chassis Unit EXA1615
45 Pinch Holder Unit EXA1608

46 Pinch Roller ENV1518
47 Pinch Holder Unit EXA1607
48 Pinch Roller ENV1518
49 Reel Unit EXA1625
50 Head Base Unit EXA1611

51 Lever Unit EXA1587
52 Gear Unit EXA1596
53 Motor Unit(M2) EXA1627
54 Washer HBF-179
55 Spring EBH1537

56 Arm ENC1537
57 Sensor Unit EWM1041
58 Worm Gear ENV1564
59 Spring EBH1545

- CASSETTE MECHANISM MODULE SECTION PARTS LIST

IC 721

HA12187FP

BUS IC

LDO

LDI

CSLOAD

MS

46

STBY

53

LCDPW

38

POWER

34

31

ENC1M

32

33

SYSTEM

CONTROLLER

IC 601(2/2)

PD5709B

LANLP

8

IPPW

15

CSEJ

ILMPW

B.U

CN701

CN402

Q761

B.U

Q752

Q753

FM/AM TUNER UNIT

19

3

PDIO

VCC

stby

B.U

LOAD

5

1

4

2
1

3

11

20

19

DECK UNIT

IC251

HA12228F

IC351

PA2020A

DOLBY-B

MECHANISM

DRIVER

CN251

CN252

CN254

CN255

CN253

6

16

MS

Lch

FWD
L-ch

REV
L-ch

39

32

33

18

19

17

3

15 6

8

7

10

CN256

3

15 6

S101

LOAD

S102

MODE

Q101
REEL

SENSE

M

M

M2

SUB

MOTOR

M1

MAIN

MOTOR

5

2

1

SENSOR UNIT

11

6

55

6

17

f/R

FR

42

41

DIR

MS

STBY

15

13

15

13

49

47

POS
ES

13

11

POS
ES

POS

ES

18

17

18

17

52

50

16

15

SC1

CM

20

B.U

16

16

51

14

SC2

SC1
CM

SC2

SC1
CM

SC2

VDD

CN501

ANT

S

63

SYSPW

PCE2

PCK

PCE1SLFMSD

S103
70µs

4

4

mtl

MTL

8

8

1

DIN1

2

DOUT

6

5

TX­TX+

BUS+

BUS-

MUTE

Q482

AMB

AMPW

Q541

AUDIO 8

ST

B.U

BU

FU901

CSL

MTL

44

CSLOAD

Q762

74

SWVDPW

MUTE

LCD 8V

ILL 10V

Q751

B.U

AUDIO+B

24 25

ENC1P

ENC2M

ENC2P

MODE

37

36

35

IC 3

EEPROM

28

27

FM/AM 1ST IF 10.7MHz

T51 Q51 CF51

CF52 CF53

IC1

MIXER, IF AMP, DET.

6

21
18

LDET

COMP

222510 14 12 15 16 8 13 2 3 4

CF202

VDD

VCC

DI/DO

CE2CKCE1

SDBWSLFMSD

NL1

NL2

IC 2 FM MPX

AMANT

FMANT

ATT

ATT

AMRF

FMRF

IMG ADJ

RF ADJ

X901

10.25MHz

ANT ADJ

LOCL

23

LOCH

AMDET

MPXREF 41kHz

AM 2ND IF

450kHz

19

CREQ

11

DGND

1

STIND

L ch

5

R ch

924

AMDET

FMLOCL

20

177

AMPNS

WC

26

RFGND

AMIN

C

D

19

IC 541

HA12181FP

AM PNS

16

3

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3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM

3.1 BLOCK DIAGRAM

9

1

BSENS

ASENS

VDD

B.U

BACK UP

72

17

16

FMSD

SL

PCE1

PCK

PCE2

PDO

10

FLOUT

11

RLOUT

XOUT

XIN

B.U

SWVDD

IL+B

BL+B

ILL+B

CSEJ

ENC1M
ENC1P

LCDBL

5

3

19

17

RL—

RL+

FL+

FL-

GND

ISENS

5

76

FM L

3

POWER

7

LDO

34

LDI

31

ENC1M

32

14

LANL+

5

CSL

4

71

1
4

80

19

FL

12

RL

15

22

4

SYSTEM

CONTROLLER

RESET

POWER AMP

IC 101

PML010A

IC 681

S-80736AN-D0

IC 201

TDA7384

RESET

Q421

SYSPW

Q201

Q461

Q431

8

IPPW

IPPW

ELECTRONIC VOLUME/

SOURCE SELECTOR

STBY

MUTE

IC 901

LC75853NE

LCD DRIVER

KEY MATRIX

LCD

10

16

5

15

17

19

12

11

16

6

4

2

9

5

LDI
LDO

KEY DATA

LCD DATA

64
61

CN601

CN901

KEYBOARD UNIT

MAIN UNIT

10

X601

12

ACC

RL—

RL+

ILL

FL—

FL+

2

CN401

IC 601(1/2)

PD5709B

Q411

Q462

ST

20

Q211

B.U

SYSPW

63

Q731

23

1

DIN1

TX

22

2

DOUT

RX1

LANMUTE

65

AMPW

66

AMPW

AUDIO 8V

ILL

Q202

VDD 5V

IC 421

S-81256SGUP-DIM

Q463

3

Q464

74

LANMUTE

MUTE

SWVDD

MUTE

SYSMUTE

62

BU MUTE

2

B.U

Q471

B.U

Q472

SYSPW

BSENS

ASENS

ISENS

19

FROUT

FR

11

BEEP

21

BACK UP

D901-D931

S914

EJECT

MAIN VOLUME

VR901

MODE SELECTOR

VR902

POWER

ENC1M
ENC1P

POWER

ENC1P

ENC2M
ENC2P

13

8

3

6

18

15

MODE

ENC2M
ENC2P

MODE

A

B

PDI

79

Q453

ANT+B

ANT

ANT

ACC

FMPW

67

AMPW

66

Q452

Q451

D454

2

AML

B.U

11

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A-a A-b

A-a

A-b

A-b

A-a

Large size

SCH diagram

Guide page

Detailed page

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

A-a

A

B

CN901

FM/AM TUNER UNIT

Decimal points for resistor
and capacitor fixed values
are expressed as :

2.2 2R2

0.022 R022

←

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.

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

NOTE :

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

AM PNS

FM(30%): -30dBs
AM(30%):-12.7dBs

FM(30%): -30dBs

AM(30%):-21.7dBs

TAPE:-11.8dBs

CD: +1.0dBs

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3.2 OVERALL CONNECTION DIAGRAM(GUIDE PAGE

A-b

A

A

C

CN251

MAIN UNIT

>

ACC SENSE

B.UP SENSE

ILM SENSE

LAN MUTE

BUS IC

E-VOL

FM(30%):-12.9dBs

AM(30%):-12.7dBs

TAPE: +0.3dBs

CD: +7.1dBs

FM(30%):+12.6dBs

AM(30%):+13.3dBs

TAPE:+26.3dBs

CD:+33.1dBs

TAPE:-8.4dBs
(400Hz 200nWb/m)

CD:+8.2dBs

(1KHz 0dB)

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A-a

A-b
A-a

A-a

A-b

1

2

FM/AM TUNER UNIT

AM PNS

FM(30%): -30dBs

AM(30%):-12.7dBs

FM(30%): -30dBs

AM(30%):-21.7dBs

TAPE:-11.8dBs

CD: +1.0dBs

A-a

A-b
A-a

A-a

A-b

3 4

B

CN901

Decimal points for resistor

and capacitor fixed values

are expressed as :

2.2 2R2

0.022 R022

←

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.

Symbol indicates a resistor.

No differentiation is made between chip resistors and

discrete resistors.

NOTE :

Symbol indicates a capacitor.

No differentiation is made between chip capacitors and

discrete capacitors.

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