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Service
Manual ORDER NO.
CRT2544


RX300
AUDIO SYSTEM
HEAD UNIT

VEHICLE DESTINATION PRODUCED AFTER TOYOTA PART No. ID No. PIONEER MODEL No.
LEXUS RX300 U.S.A., CANADA August 2000 86120-48090 P1725 KEX-M8006ZT/UC
LEXUS RX300 U.S.A., CANADA August 2000 86120-48090 P1725 KEX-M8006ZT-91/UC
LEXUS RX300 EUROPE August 2000 86120-48100 P3730 KEX-M8106ZT/EW
LEXUS RX300 EUROPE August 2000 86120-48100 P3730 KEX-M8106ZT-91/EW




Manufactured for TOYOTA
by PIONEER CORPORATION PUB. NO. CRT2544
KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91



KEX-M8006ZT/UC KEX-M8106ZT/EW




ID No.P1725 ID No.P3730
- This service manual should be used together with the following manual(s):
Model Order No. Mech. Module Remarks
CX-631 CRT1640 2L Cassette Mech. Module:Mech.Description


- Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
- This service manual does not describe the CD test mode.
For the operations in the CD test mode, refer to the CD player's Service Manual.
- KEX-M8006ZT/UC and KEX-M8106ZT/EW have adopted AVC-LAN.
- Supplementary model is identical to the original except for the addition of following items.


Description Part No.
KEX-M8006ZT-91/UC KEX-M8106ZT-91/EW
Polyethylene Bag CEG-162 CEG-162
Cover CEG1045 CEG1045
Carton CHA1721 CHA1721
Contain Box CHL4111 CHL4112




CONTENTS
1. SAFETY INFORMATION ............................................3 7. GENERAL INFORMATION .......................................56
2. EXPLODED VIEWS AND PARTS LIST .......................4 7.1 DIAGNOSIS .......................................................56
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM .....8 7.1.1 CONNECTOR FUNCTION DESCRIPTION ..56
4. PCB CONNECTION DIAGRAM ................................30 7.1.2 TROUBLESHOOTING................................57
5. ELECTRICAL PARTS LIST ........................................40 7.2 IC ........................................................................58
6. ADJUSTMENT..........................................................51 7.3 EXPLANATION..................................................61
7.3.1 SYSTEM BLOCK DIAGRAM ...................61
7.3.2 OPERATION FLOW CHART.....................62
8. SPECIFICATIONS......................................................63




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KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91



1. 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.




3
KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91



2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR




B




A




4
KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91



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.

- EXTERIOR SECTION PARTS LIST

Mark No. Description Part No.
1 Screw BMZ26P050FMC
2 Screw BMZ30P050FMC
3 Cover CHW1830
4 Case CNB2621
5 Cloth CNM5798

6 Insulator CNM6654
7 Cushion CNM6934
8 Main Unit(KEX-M8006ZT) CWM7097
Main Unit(KEX-M8106ZT) CWM7098
9 Screw BMZ30P080FMC

10 Screw BPZ30P060FSN
11 Terminal(CN202) CKF1059
12 Terminal(CN303) CKF1059
13 Connector(CN302) CKM1065
14 Connector(CN301) CKM1322

15 Connector(CN701) CKS3568
16 Antenna Jack(CN201) CKX1024
(KEX-M8006ZT)
Antenna Jack(CN201) CKX1041
(KEX-M8106ZT)

17 Holder CNC8711
18 Holder CNC8712
19 FM/AM Tuner Unit CWE1543
(KEX-M8006ZT)
FM/AM Tuner Unit CWE1591
(KEX-M8106ZT)

20 Holder(KEX-M8006ZT) CNC6774
Holder(KEX-M8106ZT) CNC6122
21 Chassis Unit CXB5302
22 Cassette Mechanism Module EXK3885
23 Screw IMS26P050FMC

24 Transistor(Q331) 2SB1185
25 Transistor(Q521) 2SB1185




5
KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91


2.3 CASSETTE MECHANISM MODULE




D




E




C




6
KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91



- CASSETTE MECHANISM MODULE SECTION PARTS LIST

Mark No. Description Part No. Mark No. Description Part No.
1 Screw BSZ20P040FMC 31 Gear ENV1347
2 Washer CBF1037 32 Collar ENV1508
3 Washer CBF1038 33 Gear ENV1350
4 Washer CBG1003 34 Flywheel ENV1500
5 Deck Unit EWM1027 35 Worm Gear ENV1439

6 Screw(M2x5) EBA1028 36 Worm Wheel ENV1440
7 Screw(M2x2.5) EBA1037 37 Gear ENR1037
8 Spring EBH1531 38 Lever ENV1533
9 Spring EBH1589 39 Arm ENV1525
10 Connector(CN251) CKS3540 40 Gathering PCB ENX1037

11 Spring EBH1515 41 Gathering PCB ENX1060
12 Spring EBH1587 42 Switch(S1)(S2) ESG1004
13 Spring EBH1517 43 Motor Unit(M2)(SUB) EXA1382
14 Spring EBH1518 44 Chassis Unit EXA1559
15 Spring EBH1519 45 Tube ENM1039

16 Spring EBH1537 46 Roller ENR1027
17 Cord EDD1027 47 Reel Unit EXA1560
18 Photo-interrupter(EGN2,3) EGN1006 48 Head Base Unit EXA1434
19 Photo-interrupter(EGN1) EGN1005 49 Lever Unit EXA1578
20 Roller ENR1031 50 Gear Unit EXA1545

21 Shaft ELA1362 51 Frame Unit EXA1476
22 Roller ELA1348 52 Lever Unit EXA1439
23 Arm ENC1490 53 Head Assy(HD1) EXA1594
24 Arm ENC1397 54 Motor Unit(M1)(MAIN) EXA1499
25 Guide ENC1519 55 Washer HBF-179

26 Holder ENC1516 56 Screw JGZ20P025FNI
27 Lever ENC1448 57 Spring EBH1545
28 Arm ENC1488 58 Washer YE20FUC
29 Roller ENR1023 59 Pinch Roller Unit EXA1533
30 Belt ENT1027 60 Pinch Roller Unit EXA1532

61 Capacitor(C1) CEAL4R7M35




7
1 2 3 4
KEX-M8006ZT,M8006ZT-91,M8106ZT,M8106ZT-91

3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM(KEX-M8006ZT)

A
A MAIN UNIT
FM/AM TUNER UNIT
CN201 DIVER
B L2 D5 Q3 L4 D7 T31 Q31 CF51 CF52 CF53 L52
FM-L
SUB
ANT 25
Q70
41 9 10 14 15 17 19 47 1 2
MUT
MAIN IC1 30 IC2 19
FM 34 7 AM-L
ANT PA4026A 28 PA4024A Lch
OSC Q70
Q201 6 38 36 32 23 25 31 40 7 43 MUT
AM RF
AM FMSL SL
26 9
AMSL
CF230 CF232 18

1 IC202 AM
FMB
LA1061M 5,6
OSC AMIF 10
AMB




AMIFC
D231 ST
13 ST 3




COMP
AMTV




FMSD
VCO
FMTV




TUNB
FIX

19 20 17 15 2114 13 6 2
Q203
COMP COMP
Q201
SD

25 29 9
5
B IC201 PM2007A
4
PLL
PDI
PCK RBDS DECODER
XOUT




PDO
XIN




PCE
20 18 2 1
IC204 PM4006B IC205 57K
38 37 3
NJM2903M
11 12




TAPE-L




C DECK UNIT
CN252 CN251 CN701
+B
1 4 4 AUD+B
TAPE EQUALIZER 22 25
FWD 51 88 57K
6 Q706 TAPEMUTE PDI
LcH 53
IC251 PCK
3 3
HA12216F TAPE-L PDO
4 PCE
2 17 14
REV
LcH VR301 NR MTL
5
BU
VREF
Q271 SYST
B.U 20 20 BU
MTL

RESET
C Q351
VDD IC703 1 12
RESET
STBY




Q352 2 S-80736AN-D0
19 18 7 17
5
SUB MECHANISM DRIVER
M 2
MOTOR IC351
PA2020A
LOAD




XOUT



XIN


8 9 1 10


E CN253
4 6 1 8 3 2
13 15



REEL PCB 4 6 1 8 3 2

FWD
SENSE

REV
SENSE
MODE 70