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ORDER NO.
CRT2222
Service
Manual
PUB. NO.
CRT2222
AUDIO SYSTEM
HEAD UNIT
Manufactured for TOYOTA
by PIONEER ELECTRONIC CORPORATION
SC400
VEHICLE
DESTINATION
PRODUCED AFTER
ID No.
TOYOTA PART No.
PIONEER MODEL No.
LEXUS SC400
KEX-M8886ZT/UC
LEXUS SC300
KEX-M8886ZT-91/UC
August 1998
P6807
86120-24350
U.S.A.,CANADA
SC300


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2
KEX-M8886ZT,M8886ZT-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.
ASL
1
23
45
BASS
MID
6
PROG
SKIP
RPT
AM
RPT
RANDOM
TRACK
FM1/2
TAPE
CD
TREB
BAL
FADE
B·C
FAST
SCAN
SEEK
TUNE
DISC
FF
REW
SCAN
SCAN
PREMIUM SOUND SYSTEM
P6807
- Supplementary model is identical to the original except for the addition of following items.
Description
Part No.
KEX-M8886ZT-91/UC
Polyethylene Bag
CEG1026
Cover
CEG2095
Carton
CHA2025
Contain Box
CHD2025
CONTENTS
1. SAFETY INFORMATION ............................................3
2. EXPLODED VIEWS AND PARTS LIST .......................4
3. SCHEMATIC DIAGRAM .............................................8
4. PCB CONNECTION DIAGRAM ................................18
5. ELECTRICAL PARTS LIST ........................................29
6. ADJUSTMENT..........................................................37
7. GENERAL INFORMATION .......................................44
7.1 PARTS ................................................................44
7.1.1 IC ..............................................................44
7.1.2 DISPLAY...................................................48
7.2 DIAGNOSIS .......................................................49
7.2.1 DIAGNOSIS MODE .................................49
7.2.2 DISASSEMBLY ........................................53
7.2.3 CONNECTOR FUNCTION DESCRIPTION ..54
7.3 EXPLANATION..................................................55
7.3.1 BLOCK DIAGRAM ...................................55
7.3.2 SYSTEM BLOCK DIAGRAM ...................56
8. OPERATIONS AND SPECIFICATIONS.....................57


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3
KEX-M8886ZT,M8886ZT-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.


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4
KEX-M8886ZT,M8886ZT-91
2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR


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5
KEX-M8886ZT,M8886ZT-91
Mark No. Description
Part No.
Mark No. Description
Part No.
- EXTERIOR SECTION PARTS LIST
1 Screw
BMZ26P050FMC
2 Screw
BMZ30P050FMC
3 Chassis
CNA2011
4 Case
CNB2262
5 Cushion
CNM3138
6 Main Unit
CWM5679
7 Screw
BMZ30P060FMC
8 Screw
CBA1339
9 Connector(CN803)
CKM1087
10 Connector(CN801)
CKM1222
11 Connector(CN802)
CKM1238
12 Plug(CN604)
CKS-291
13 Connector(CN601)
CKS2826
14 Plug(CN602)
CKS3534
15 Plug(CN603)
CKS3542
16 86146-48030(CN551)
CKX1057
17 86146-48040(CN552)
CKX1058
18 Holder(CN804)
CNC2218
19 Holder
CNC7490
20 Holder
CNC7491
*
21 Sheet
CNM6076
22 FM/AM Tuner Unit
CWE1523
23 Holder
CNC6774
24 Chassis Unit
CXB2117
25 Screw
BPZ26P100FMC
26 Button(AM)
CAC2303
27 Button(FM 1/2)
CAC2304
28 Button(TAPE)
CAC2305
29 Button(1,2)
CAC2307
30 Button(3,4)
CAC2308
31 Button(5,6)
CAC2309
32 Button(EJECT)
CAC2310
33 Button(SCAN)
CAC2311
34 Button(ASL)
CAC5453
35 Button(CD)
CAC5460
36 Button(SEEK)
CAC5462
37 Sheet
CNM2362
38 Spacer
CNM6047
39 Holder
CNV2320
40 Holder
CNV2321
41 Holder
CNV2324
42 Holder
CNV2325
43 Holder
CNV2326
44 Lens
CNV2329
45 Lens
CNV2330
46 Lens
CNV2333
47 Lens
CNV3390
48 Lens
CNV5220
49 Holder
CNV5221
50 Lens
CNV5502
51 Lens
CNV5503
52 Keyboard Assy
CWM5680
53 LCD
CAW1463
54 Socket(CN902)
CKS3547
55 Socket(CN903)
CKS3548
56 Socket(CN901)
CKS3555
57 Holder
CNC6709
58 Conductor
CNC7488
59 Plate
CNM2530
60 Volume
CCS1119
61 Holder
CNV2327
62 Lens
CNV2833
63 Rubber
CNV5210
64 Rubber
CNV5216
65 Knob
CAA1237
66 Plug(CN951)
CKS3535
67 Holder
CNC6710
68 Lens Assy
CXA4208
69 Lens
CNV2332
70 Grille Unit
CXB2120
71 Door
CAT1934
72 Spring
CBH1371
73 Cassette Mechanism ModuleEXK3240
74 Screw
IMS30P040FMC
75 Transistor
2SB942
76 Screw
CBA1200
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.