Pioneer KEX-M8186ZT/ES User manual

ORDER NO.
CRT2252
PUB. NO. CRT2252
AUDIO SYSTEM
HEAD UNIT
Manufactured for TOYOTA
by PIONEER ELECTRONIC CORPORATION
ES300
Service
Manual
VEHICLE DESTINATION PRODUCED AFTER ID No. TOYOTA PART No. PIONEER MODEL No.
LEXUS ES300 MIDDLE EAST December 1998 P7510 86120-33230 KEX-M8186ZT/ES
KEX-M8186ZT-91/ES

2
KEX-M8186ZT,M8186ZT-91
-Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
"Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation.
-See the separate manual CX-529 (CRT1507) for the cassette mechanism description.
-The cassette mechanism employed in this model is one of 2L mechanism description.
P7510
NOTE:
-The KEX-M8186ZT-91/ES is supplementary genuine part for a TOYOTA vehicle, and a Pioneer product
for recycling stock.
-As for the structure and electrical system, there is no difference between the KEX-M8186ZT/ES and
KEX-M8186ZT-91/ES.
-Supplementary model is identical to the original except for the addition of following items.
Description Part No.
Polyethylene Bag CEG1026
Carton CHA2025
Contain Box CHD2025
Protector CHP1888,1889
CONTENTS
1. SAFETY INFORMATION ............................................3
2. EXPLODED VIEWS AND PARTS LIST.......................4
3. SCHEMATIC DIAGRAM .............................................8
4. PCB CONNECTION DIAGRAM ................................24
5. ELECTRICAL PARTS LIST ........................................38
6. ADJUSTMENT..........................................................46
7. GENERAL INFORMATION .......................................51
7.1 PARTS................................................................51
7.1.1 IC ..............................................................51
7.1.2 DISPLAY...................................................53
7.2 DIAGNOSIS.......................................................54
7.2.1 DIAGNOSIS MODE .................................54
7.2.2 DISASSEMBLY ........................................58
7.2.3 CONNECTOR FUNCTION DESCRIPTION ..59
7.3 BLOCK DIAGRAM.............................................60
8. OPERATIONS AND SPECIFICATIONS.....................62

3
KEX-M8186ZT,M8186ZT-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.

4
KEX-M8186ZT,M8186ZT-91
2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR

5
KEX-M8186ZT,M8186ZT-91
Mark No. Description Part No. Mark No. Description Part No.
-EXTERIOR SECTION PARTS LIST
1 Screw BMZ26P050FMC
2 Screw BMZ30P050FMC
3 Case CNB1980
4 Insulator CNM4472
5 Spacer CNM4564
6 Main Unit CWM6017
7 Chassis Unit CXB1275
8Cassette Mechanism ModuleEXK3045
9 Screw IMS30P050FMC
10 Spacer CNM5593
11 Screw BMZ30P060FMC
12 Screw CBA1339
13 Connector(CN703) CDE4737
14 Connector(CN852) CKM1074
15 Plug(CN851) CKM1221
16 Connector(CN402) CKS2826
17 Connector(CN401) CKS2628
18 Connector(CN652,653) CKS3008
19 Plug(CN701,702) CKS3156
20 Antenna Jack(CN651) CKX1024
21 Holder CNC2218
22 Holder CNC4981
23 Holder CNC6057
24 Holder CNC6058
25 MW/SW Unit CWA1077
26 FM Unit CWE1345
27 Screw BPZ26P100FMC
28 Button(TUNE,SEEK) CAC4438
29 Button(EJECT) CAC4583
30 Button(1,2) CAC4736
31 Button(3,4) CAC4737
32 Button(5,6) CAC4738
33 Button(SCAN,P.SCAN) CAC4739
34 Button(AM/SW) CAC5746
35 Button(FM) CAC5747
36 Button(TAPE) CAC4742
37 Button(CD) CAC4743
38 Holder CNV3645
39 Holder CNV3646
40 Holder CNV3647
41 Holder CNV3648
42 LCD Unit CWM6019
43 Keyboard Unit CWM6018
44 Knob Unit CXB4042
45 Spring CBL-108
46 Knob Unit CXB4043
47 Spring CBL-108
48 Grille Unit CXB2863
49 Door CAT1980
50 Spring CBH1371
51 Plug(CN202) CKS1607
52 Plug(CN201) CKS1615
53 Holder CNC5060
54 Plug(CN2) CKS1607
55 Plug(CN1) CKS1616
56 Holder CNC4666
57 Holder CNC7007
58 FM Front End CWB1070
59 Screw BPZ20P060FMC
60 LCD CAW1494
61 Plug(CN903) CKS2706
62 Holder CNC5182
63 PCB CNP4104
64 Holder CNV4343
65 Nut CBN1008
66 Connector(CN901,902) CKS2646
67 Connector(CN905) CKS2827
68 Connector(CN904) CKS2835
69 Holder CNC6068
70 Rubber CNV3649
71 Rubber CNV3650
72 Rubber CNV4324
73 IC(IC951) TA8214K
74 Transistor(Q958,959) 2SB1335A
75 Volume(VR901-905) CCS1119
76 Volume(S901) CCS1106
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.

6
KEX-M8186ZT,M8186ZT-91
2.2 CASSETTE MECHANISM MODULE

7
KEX-M8186ZT,M8186ZT-91
1 Pinch Roller Assy EXX1037
2 Screw BSZ20P040FMC
3 Screw(M2x4) CBA1015
4 Washer CBF1037
5 Washer CBF1038
6 Washer CBG1003
7 Pinch Roller Assy EXX1038
8 Deck Unit CWM3710
9 Spring EBH1458
10 Spring EBH1434
11 Spring EBH1435
12 Spring EBH1437
13 Spring EBH1464
14 Spring EBH1439
15 Spring EBH1440
16 Spring EBH1441
17 Spring EBH1442
18 Spring EBH1443
19 Spring EBH1446
20 Spacer CNN-030
21 Spring EBL1016
22 Connector(CN252) CKS2127
23 Photo-Interrupter(EGN3) EGN1002
24 Roller ELA1281
25 Shaft ELA1282
26 Roller ELA1283
27 Cover ENC1307
28 Connector(CN251) CKS1711
29 Connector(CN253) CKS2129
30 Arm ENC1310
31 Arm ENC1311
32 Lever ENC1312
33 Holder ENC1365
34 Cover ENC1372
35 Lever ENC1315
36 Lever ENC1353
37 Bracket ENC1317
38 Arm ENC1335
39 P.C.Board ENP1109
40 P.C.Board ENP1120
41 P.C.Board ENP1119
42 Roller ENR1023
43 Belt ENT1027
44 Gear ENV1422
45 Gear ENV1347
46 Gear ENV1423
47 Collar ENV1508
48 Gear ENV1350
49 Gear ENV1351
50 Gear ENV1354
51 Gear ENV1355
52 Gear ENV1357
53 Gear ENV1358
54 Gear ENV1359
55 Clamper ENV1360
56 Clamper ENV1361
57 Arm ENV1362
58 Gear ENV1363
59 Flywheel ENV1410
60 Head Assy(HD1) EXA1364
61 Arm Unit EXA1276
62 Arm Unit EXA1277
63 Motor Unit(M1) EXA1335
64 Motor Unit(M2) EXA1279
65 Head Base Unit EXA1340
66 Gear Unit EXA1281
67 Guide Unit EXA1356
68 Chassis Unit EXA1405
69 Pinch Roller Unit EXA1284
70 Pinch Roller Unit EXA1285
71 Reel Unit EXA1486
72 Arm Unit EXA1338
73 Sub Chassis Unit EXA1312
74 Arm Unit EXA1289
75 Spare Unit EXA3021
76 Screw HBA-147
77 Washer HBF-179
78 Screw JGZ20P025FNI
79 Screw EBA1037
80 P.C.B Unit EXA1429
81 •••••
82 Washer YE15FUC
83 Washer YE20FUC
84 Washer YE25FUC
85 Frame Unit EXA1290
86 Lever ENC1308
87 Lever ENC1309
88 Screw EBA1033
89 Spring EBL1020
90 Screw JFZ17P025FNI
91 Cover ENC1351
Mark No. Description Part No. Mark No. Description Part No.
-CASSETTE MECHANISM MODULE SECTION PARTS LIST

8
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
3. SCHEMATIC DIAGRAM
3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)
Note: When ordering service parts,be sure to refer to "EXPLODED VIEWS AND PARTS LIST"or"ELECTRICAL PARTS
LIST".
4.5MHz
A-a A-b
A-a A-b
A-b
A-a
Large size
SCH diagram
Guide page
Detailed page
A-a
A
C
C
G
I

9
KEX-M8186ZT,M8186ZT-91
5678
A
B
C
D
5678
MAIN P.C.B
TUNER P.C.B
MAIN UNIT
A-b
A

10
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
4.5MHz
A-a A-b
A-a
I
C
C
A

11
KEX-M8186ZT,M8186ZT-91
5678
A
B
C
D
5678
A-a A-b
A-a
G

12
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
MAIN P.C.B TUNER P.C.B
MAIN UNIT
A-a A-b
A-b
I

13
KEX-M8186ZT,M8186ZT-91
5678
A
B
C
D
5678
A-a A-b
A-b

14
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
3.2 TUNER P.C.B
MAIN P.C.B
TUNER P.C.B
B
F
E

15
KEX-M8186ZT,M8186ZT-91
1234
A
B
C
D
1234
KEYBOARD P.C.B
VOLUME P.C.B
D
3.3 KEYBOARD UNIT
C
C
D

16
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
E
3.4 MW/SW UNIT
E

17
KEX-M8186ZT,M8186ZT-91
5678
A
B
C
D
5678
MW/SW TUNER
E

18
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
F
3.5 FM UNIT
F

19
KEX-M8186ZT,M8186ZT-91
5678
A
B
C
D
5678
F

20
KEX-M8186ZT,M8186ZT-91
A
1234
B
C
D
1234
3.6 CASSETTE MECHANISM MODULE
CN402
G
G
A