Pioneer GM-8406-ZT, GM-8406-ZT-91 Service manual
ORDER NO.
CRT2498
PUB. NO. CRT2498
AUDIO SYSTEM
POWER AMPLIFIER
Manufactured for TOYOTA
by PIONEER CORPORATION
VEHICLE DESTINATION PRODUCED AFTER TOYOTA PART No. ID No. PIONEER MODEL No.
LEXUS LX470 U.S.A August 2000 86280-60250 GM-8406ZT/UC
Canada GM-8406ZT-91/UC
LX470
Service
Manual
2
GM-8406ZT,8406ZT-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.
CONTENTS
1. SAFETY INFORMATION............................................2
2. EXPLODED VIEWS AND PARTS LIST ......................3
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ....5
4. PCB CONNECTION DIAGRAM................................12
5. ELECTRICAL PARTS LIST........................................20
6. ADJUSTMENT.........................................................24
7. GENERAL INFORMATION.......................................28
7.1 DIAGNOSIS .......................................................28
7.1.1 DISASSEMBLY .........................................28
7.1.2 CONNECTOR FUNCTION DESCRIPTION ......30
7.2 IC ........................................................................31
7.3EXPLANATION...................................................34
7.3.1 OPERATIONAL FLOW CHART .................34
7.3.2 SYSTEM BLOCK DIAGRAM.....................36
8. SPECIFICATIONS.....................................................37
NOTE:
- The GM-8406ZT-91/UC is supplementally 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 GM-8406ZT-91/UC and GM-8406ZT/UC.
- Supplementally model is identical to the original except for the addition of following items.
*:Non spare part
Part No.
Description GM-8406ZT-91/UC
Cover CEG1057
Protector CHP2329
Protector CHP2330
Carton CHG4144
Contain Box CHL4145
- When diagnosing a product, take care of its heated portion.
Power IC (IC801,802,803)
Power Supply IC (IC901,902)
DSP IC (IC201,251)
Heat Sink
IC Holder
3
GM-8406ZT,8406ZT-91
2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR
4
GM-8406ZT,8406ZT-91
1 Plug(CN906) CKS4240
2 Plug(CN905) CKS4242
3 Screw BMZ30P200FMC
4 Screw BMZ50P060FMC
5 Screw BSZ26P060FMC
6 Screw BSZ30P060FMC
7 Screw BSZ30P100FMC
8 Chassis CNA2142
9 Case CNB2563
10 Shield Case CNC8185
11 Shield Case CNC8186
12 Bracket CNC8920
13 Bracket CNC8919
14 Insulator CNM6145
15 Seal CNM6686
16 Cushion CNM7009
17 Heat Sink CNR1566
18 Amp Unit CWM7110
19 Screw BPZ30P060FSN
20 Screw BSZ26P060FMC
21 Connector(CN902) CKM1308
22 Connector(CN901) CKM1310
23 Holder CNC8187
24 Bracket CNC8681
25 Sheet CNM7015
26 DSP Unit CWM7111
27 Socket(CN102) CKS3632
28 Socket(CN101) CKS4241
29 Spacer CNV6284
30 IC(IC902) BA178M05T
31 Microphone(MIC401) CPM1011
32 IC(IC801,802,803) PAL006A
33 Seal CNM7170
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.
Mark No. Description Part No.
5
GM-8406ZT,8406ZT-91
1
2
3
4
A
B
C
D
1
2
3
4
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM
13
11
9
6
13
11
9
6
3
6
9
8
13
7
16
13
10
11
12
6
7
12
IC251
PD2061A
IC181
AK5351VF
IC261
AK4321VF
IC351
PM0017AM
IC101
PD5585A
IC131
S-80730ANDT
IC902
BA178M05T
IC901
NJM2930F08K
Q904
Q906
Q912
Q909
Q903
5V REGULATOR
8V REGULATOR
SYSTEM
POWER SWITCH
5V REGULATOR
AUDIO INPUT
BUFFER
INPUT
CONNECTOR
OUTPUT
CONNECTOR
IC501
NJM2068MD
IC903
M51957BFP
IC703
NJM2068MD
IC803
PAL006A
SUB WOOFER
POWER AMP
SUB WOOFER
OPE AMP
REAR
POWER AMP
FRONT
POWER AMP
FRONT-L
OPE AMP
REAR-L
OPE AMP
IC701
NJM2068MD
IC702
NJM2068MD
P
PEE
3
1
11
9
7
7
9
4
11
1
3
2
1
11
7
9
2
7
6
1
7
2
6
1
3
1
3
SYS4
BU1
STBY1
BU1
BU1
BU1
L901
B.U
WFL-
WFL+
IC802
PAL006A
IC801
PAL006A
RL-
RL+
FL+
FL-
CN901
L-
L+
TMUT
MUTE
(H/U MUT)
ACC
Q915
6
7
18
A/D
ACC1
ACC1
BU1
ASENS
BSENS
Q155
Q151
17
16
N-MU
NMUT
Q171
NAVIMUTE
79
RESET
1
RESET
9
2
SYSTEM CONTROLLER
SYSPW1
SYSPW1
SYS5SYSD5
1
18
17
2
SYSA5
AVDD
DVDD
16
3
SYS8
SYS8
Q161
SYSPW1
66
Q910
Q911
2
4
STBY1
4
25
25
25
Q801
Q802
Q803
PMUT
MUTEO
MUTO
1
MUTE
MUTIN
MUTI
Q175
31
SMUTEIN
Q913
PWSENS
65
MUTE
/STBY
MUTE
VDD5VDD5
VDD
P
PEE
11
8
PEE
21
NMUT1
NAVI/MUTE
ACC SENSE
BACK UP SENSE
SYSTEM MUTE
PEE
SYSP1
CN906
CN101
CN905
CN102
FS
FS
5
14
A
A
B
B
CN902
ELECTRONIC
VOLUME
IC401
NJM2068MD
Q401
MIC
MIC401
VR401
3
ASLIN2
76
1
ASLIN1
74
IC402
NJM2068MD
5
7
ASL
8
8
IC141
HA12187FP
BUS DRIVER
AVCIN
AVCOUT
AVCPW
22
23
20
2
1
8
7
14 5
15 4
DSP
DSP
10
12
XOUT
XIN
21
IC281
AK4321VF
IC291
AK4321VF
IC311
NJM2068MD
IC331
NJM2068MD
IC341
NJM2068MD
FRONT DAC
IC231
TC7WU04F
IC241
TC7W74FU
1
7
CRYSTAL
OSCILLATOR
REAR DAC
WOOFER DAC
FRONT LPF
REAR LPF
WOOFER LPF
16
8
2
18
1
5
17 16
19 18
16
15
8
8
2
18
5
18
3
1
7
7
20
RLO
RLIN
22
FLO
FLIN
18
WFO
WFIN
FL-
FL+
17
19
(TWLP)
(TWLP)
(TWLM)
(TWLM)
(RLM)
(RLP)
(FLM)
(FLP)
AINL+
AINL-
SDATA
SDI1
SDO1
SDO0
SDO2
SDI0
SDI1
SDO1
SDO2
(FDATA)
(WDATA)
(RDATA)
VCC
8
VCC
8
3
1
2
2
3
5
5
5
(256FS)
CK
D
q
XTI
SDATA
AOUTL
XTI
SDATA
AOUTL
XTI
SDATA
AOUTL
IN1
IN3
IN5
OUT3
OUT1
OUT5
(FSW)
(FSW)
Q833
Q832
Q831
10
10
10
Q950
B
A
DSP UNIT
AMP UNIT
5
5
19
SDI0
Q291
68
DSPERR
17
AOUTR
6
SYS4
6
SYS4
6
SYS4
22
MPUT
STBY1
STBY1
22
MPUT
22
MPUT
Q101
(ASL1)
(ASL2)
SPD
SPDO
C
(SPD)
C
Q907
10
9
SPD1SPD1
SPEED SENSOR PULSE
15
SPEED
VDD
IC201
PD2061A
6
GM-8406ZT,8406ZT-91
A
1
234
B
C
D
12
34
3.2 SCHEMATIC DIAGRAM
Note: When ordering service parts, be sure to refer to “EXPLODED VIEWS AND PARTS LIST” or “ELECTRICAL
PARTS LIST”.
TAPE:-7.0dBs
TAPE:-2.6dBs
4R7K
270
4R7K
270
4R7K
270
180
6R8K
SYSTEM POWER
A-a A-b
A-a
A-b
A-b
A-a
Large size
SCH diagram
Guide page
Detailed page
A
A-a
B
7
GM-8406ZT,8406ZT-91
5
6
7
8
A
B
C
D
5
6
7
8
A-b
A
B
OUTPUT OFFSET
INDICATOR
OUTPUT OFFSET
INDICATOR
OUTPUT OFFSET
INDICATOR
OUTPUT OFFSET
INDICATOR
SPEED SENSOR PULSE
Decimal points for resistor
and capacitor fixed values
are expressed as :
2.2 2R2
0.022 R022
←
←
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.
A
DSP UNIT
B
AMP UNIT
TAPE:+1.2dBs
CD:+8.2dBs
TUNER: -13dBs
TAPE:+23.4dBs
CD:+30.4dBs
TUNER:+9.4dBs
TAPE:-15.5dBs
TAPE:-8.4dBs
TAPE:-3.4dBs
1R8K
18K
2R7K
PREVENTION CIRCUIT
CRANKING
33K
2R7K
4R7/50
33K
UDZS7R5(B)
8
GM-8406ZT,8406ZT-91
A
1
234
B
C
D
12
34
180
6R8K
SYSTEM POWER
A-a
A-b
A-a
1
2
9
GM-8406ZT,8406ZT-91
5
6
7
8
A
B
C
D
5
6
7
8
A-a
A-b
A-a
B
3
4
5
6
OUTP
IND
OUTPUT OFFSET
INDICATOR
OUT
IN
TAPE:-7.0dBs
TAPE:-2.6dBs
4R7K
270
4R7K
270
4R7K
270
10
GM-8406ZT,8406ZT-91
A
1
234
B
C
D
12
34
A-a
A-b
A-b
A
DSP UNIT
TAPE:-15.5dBs
TAPE:-8.4dBs
TAPE:-3.4dBs
1
2
11
GM-8406ZT,8406ZT-91
5
6
7
8
A
B
C
D
5
6
7
8
A-a
A-b
A-b
B
OUTPUT OFFSET
INDICATOR
OUTPUT OFFSET
INDICATOR
OUTPUT OFFSET
INDICATOR
SPEED SENSOR PULSE
Decimal points for resistor
and capacitor fixed values
are expressed as :
2.2 2R2
0.022 R022
←
←
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.
B
AMP UNIT
TAPE:+1.2dBs
CD:+8.2dBs
TUNER: -13dBs
TAPE:+23.4dBs
CD:+30.4dBs
TUNER:+9.4dBs
1R8K
18K
2R7K
PREVENTION CIRCUIT
CRANKING
33K
2R7K
4R7/50
33K
UDZS7R5(B)
3
4
5
6
12
GM-8406ZT,8406ZT-91
A
1
234
B
C
D
12
34
4. PCB CONNECTION DIAGRAM
4.1 DSP UNIT
NOTE FOR PCB DIAGRAMS
1. The parts mounted on this PCB
include all necessary parts for
several destination.
For further information for
respective destinations, be sure
to check with the schematic diagram.
Capacitor
Connector
P.C.Board
Chip Part
SIDE A
SIDE B
2. Viewpoint of PCB diagrams
DSP UNIT
CN906
A
A
B
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