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Service
Manual ORDER NO.
CRT2496
RX300
AUDIO SYSTEM
POWER AMPLIFIER
VEHICLE DESTINATION PRODUCED AFTER TOYOTA PART No. ID No. PIONEER MODEL No.
LEXUS RX300 USA, CANADA August 2000 86280-48050 GM-8706ZT/UC
EUROPE GM-8706ZT-91/UC
86280-48040 GM-8306ZT/EW
GM-8306ZT-91/EW
Manufactured for TOYOTA
by PIONEER CORPORATION PUB. NO. CRT2496
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
GM-8706ZT/UC, GM-8306ZT/EW
NOTE:
- The GM-8706ZT-91/UC and GM-8306ZT-91/EW are supplementary genuine part for a TOYOTA vehicle, and a Pioneer
product for recycling stock.
- As for the electrical system, there is no difference between the GM-8706ZT-91/UC, GM-8306ZT-91/EW and GM-
8706ZT/UC, GM-8306ZT/EW.
- Supplementary model is identical to the original except for the addition of following items.
Part No.
Description GM-8706ZT-91/UC GM-8306ZT-91/EW
Cover CEG1045 CEG1045
Carton CHG2410 CHG2410
Contain Box CHL4114 CHL4113
CONTENTS
1. SAFETY INFORMATION............................................2 7. GENERAL INFORMATION.......................................34
2. EXPLODED VIEWS AND PARTS LIST ......................4 7.1 DIAGNOSIS .......................................................34
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ....8 7.1.1 DISASSEMBLY.........................................34
4. PCB CONNECTION DIAGRAM................................22 7.1.2 CONNECTOR FUNCTION DESCRIPTION ......35
5. ELECTRICAL PARTS LIST........................................26 7.2 IC ........................................................................36
6. ADJUSTMENT .........................................................33 7.3 EXPLANATION...................................................39
7.3.1 OPERATIONAL FLOW CHART .................39
7.3.2 SYSTEM BLOCK DIAGRAM.....................40
8. SPECIFICATIONS .....................................................41
2
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-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
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR (GM-8706ZT/UC)
4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-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.
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
1 Screw BMZ30P060FMC 11 Screw(M3x6) CBA1393
2 Screw See Contrast table(2) 12 Connector(CN101) CKM1074
3 Screw(M2.6x14) CBA1384 13 Connector(CN102) CKM1222
4 Screw(M3x14) CBA1427 14 Bracket CNC7145
5 Chassis CNA1938 15 Holder CNC7146
6 Case CNB2186 16 IC(IC401) TDA7384
7 86285-48030 See Contrast table(2) 17 IC(IC503) TA8221AH1
* 8 Seal CNM5381
* 9 Heat Sink CNR1446
10 Main Unit CWM7316
(2) CONTRAST TABLE
GM-8706ZT/UC and GM-8706ZT-91/UC are constructed same except for the following:
Part No.
Mark No. Description GM-8706ZT/UC GM-8706ZT-91/UC
2 Screw BMZ50P060FMC Not used
7 86285-48030 CNC9013 Not used
5
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
2.2 EXTERIOR (GM-8306ZT/EW)
6
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
1 Screw BMZ30P060FMC 11 Screw(M3x6) CBA1393
2 Screw See Contrast table(2) 12 Connector(CN101) CKM1074
3 Screw(M2.6x14) CBA1384 13 Connector(CN102) CKM1222
4 Screw(M3x14) CBA1427 14 Bracket CNC7145
5 Chassis CNA1938 15 Holder CNC7146
6 Case CNB2186 16 IC(IC401) TDA7384
7 86285-48030 See Contrast table(2)
* 8 Seal CNM5381
* 9 Heat Sink CNR1446
10 Amp Unit CWM7099
(2) CONTRAST TABLE
GM-8306ZT/EW and GM-8306ZT-91/EW are constructed same except for the following:
Part No.
Mark No. Description GM-8306ZT/EW GM-8306ZT-91/EW
2 Screw BMZ50P060FMC Not used
7 86285-48030 CNC9013 Not used
7
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
A
3.1 BLOCK DIAGRAM (GM-8706ZT/UC)
A MAIN UNIT
FIX EQ
CN101 CUT
L801
Q221,225 B.U
L- L+ BOOST
B Q223,227 RL+
BEEP
2
POWER AMP CN102
Q141 IC201
2 1 IC203 1
IC101 PMUTE 30 3 NJM2068MD FLIN 5 FL+ +B
CDL- CDL+ 3 IC104 3 NJM2068MD 12
NJM2068MD 1 42 PMJ002A 29 IC401 3 FL- ACC
MUTE
TDA7384
TMUT EMUT Q805 17
Q143 3
TX- TX+ IC202 1 IC204 1
VDT 2 NJM2068MD 3 NJM2068MD RLIN 19
15
VCK mute stby
RL- RL+
VST 22 4
Q811 FIX EQ
Q820 Q810
BOOST
B TMUTE
Q323,327
WF-
CUT WF+
Q809
Q321,325
MUTE
AUDIO
MSENSE +B
8V REGULATOR
Q806 Q812 Q808
IC801 Q803
1 NJM2930F08K 3
AUDIO
2 +B
WOOFER
WFSTBY
Q801 MUTE2
B.U
Q804
5V REGULATOR
Q621 Q802 Q807
STBY
B.U 5VD
WOOFER
POWER AMP
2 16
IC501 7 IC502 IC503
1 7 15
2 NJM2068MD 5 NJM2068MD TA8221AH1
WFSTBY
1 5 7 3
BEEP STBY
Q501
B WOOFER
4
MUTE
B.U
13
C RESET Q646
BEEP
VDT/VCK/VST BSENSE
2 IC603 1
5VD 15
S-80740AND4I BSEN
22
MUTE1 Q641
24 ASNSE
MSENS
16 14
SYSPW ASEN
23 AMPLIFIER
MUTE2
RESET CONTROL
25
reset
5 28
AVCPW XIN
8 IC601
TX+ 6 1 4 X601
IC602 AVCOUT PD5607B 6.290MHz
TX- 5 2 3
CA0008AM AVCIN 29
XOUT
D
8
1 2 3 4
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
3.2 BLOCK DIAGRAM (GM-8306ZT/EW)
A
A AMP UNIT
FIX EQ
CN101 CUT
L801
Q221,225 B.U
L- L+ BOOST
B Q223,227 RL+
BEEP
2
POWER AMP CN102
Q141 IC201
2 1 IC203 1
IC101 PMUTE 30 3 NJM2068MD FLIN 5 FL+ +B
CDL- CDL+ 3 IC104 3 NJM2068MD 12
NJM2068MD 1 42 PMJ002A 29 IC401 3 FL- ACC
MUTE
TMUT EMUT Q805
PAL006A
3 17
Q143 IC202 1 IC204
TX- TX+ 1 RLIN
VDT 2 NJM2068MD 3 NJM2068MD 15
19
VCK mute stby
RL- RL+
VST 22 4
Q811 FIX EQ
Q820 Q810
BOOST
TMUTE Q323,327 B
CUT
Q809
Q321,325
MUTE
AUDIO
MSENSE +B
8V REGULATOR
Q806 Q812 Q808
IC801
1 NJM2930F08K 3
2
Q801
B.U
5V REGULATOR
Q621 Q802 Q807
STBY
B.U 5VD
BEEP
B
B.U
13
RESET Q646 C
BEEP
VDT/VCK/VST BSENSE
2 IC603 1
5VD 15
S-80740AND4I BSEN
22
MUTE1 Q641
24 ASNSE
MSENS
16 14
SYSPW ASEN
23 AMPLIFIER
MUTE2
RESET CONTROL
25
reset
5 28
AVCPW XIN
8 IC601
TX+ 6 1 4 X601
IC602 AVCOUT PD5607B 6.290MHz
TX- 5 2 3
CA0008AM AVCIN 29
XOUT
D
9
1 2 3 4
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
3.3 SCHEMATIC DIAGRAM (GM-8706ZT/UC)
Note: When ordering service parts, be sure to refer to "EXPLODED VIEWS AND PARTS LIST" or "ELECTRICAL
PARTS LIST".
A
A-a
Large size
A-a A-b
SCH diagram
A-a A-b Guide page
-24.0dBs
-25.4dBs
A-a A-b Detailed page
B
-29.0dBs
1kHz
C
-25.5dBs
1kHz
woofer:
-22.0dBs 50Hz
-24.5dBs 50Hz
-25.5dBs -13.5dBs 50Hz
-14.5dBs 50Hz
D
10 A
1 2 3 4
5 6 7 8
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A-b A
A MAIN UNIT
BALANCE INPUT
-20dBs f-1kHz
f-50Hz
-25.5dBs
+1.0dBs
BALANCE OUTPUT
front:+1.0dBs f-1kHz
rear:+4.0dBs f-1kHz
woofer:+10.0dBs f-50Hz
B
front:
-24.8dBs
rear: C
-22.0dBs
0dBs =0.775 Vrms
-20dBs=77.5 mVrms
NOTE :
Symbol indicates a resistor. Decimal points for resistor
No differentiation is made between chip resistors and and capacitor fixed values
discrete resistors. are expressed as :
D
Symbol indicates a capacitor. 2.2 2R2
No differentiation is made between chip capacitors and 0.022 R022
discrete capacitors.
5 6 7
A 8
11
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
1
-24.8dBs
A-a A-b
front:
A
-29.0dBs
1kHz
B
-25.4dBs
-24.0dBs
C
D
12 A-a
1 2 3 4
5
5
rear:
-25.5dBs -22.0dBs
1kHz
woofer:
-22.0dBs 50Hz
6
6
2
-24.5dBs 50Hz 3
-25.5dBs -13.5dBs 50Hz
-14.5dBs 50Hz
7
7
4
8
8
A-a
A-a A-b
13
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
B
D
C
B
A
D
C
14
A-a A-b
1
1
A-b
A MAIN UNIT
BALANCE INPUT
-20dBs f-1kHz
f-50Hz
-25.5dBs
2
2
+1.0dBs
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
BALANCE OUTPUT
front:+1.0dBs f-1kHz
3
3
rear:+4.0dBs f-1kHz
woofer:+10.0dBs f-50Hz
1
4
4
front:
-24.8dBs
rear:
5
5
-22.0dBs
6
6
2
0dBs =0.775 Vrms
-20dBs=77.5 mVrms
3
NOTE :
Symbol indicates a resistor. Decimal points for resistor
No differentiation is made between chip resistors and and capacitor fixed values
7
7
discrete resistors. are expressed as :
Symbol indicates a capacitor. 2.2 2R2
No differentiation is made between chip capacitors and 0.022 R022
discrete capacitors.
4
8
8
A-b
A-a A-b
15
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
B
D
C
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
3.4 SCHEMATIC DIAGRAM (GM-8306ZT/EW)
A
A-a
-24.0dBs -25.1dBs
B
-21.2d
-25.2dBs 500
500Hz
C
-18.4dB
-22.7dBs 500H
500Hz
D
16 A
1 2 3 4
5 6 7 8
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A-b A
BALANCE INPUT
-20dBs f-500Hz
A AMP UNIT
-25.2dBs
BALANCE OUTPUT B
front:+5.2dBs f-500Hz
rear:+7.7dBs f-500Hz
2dBs
00Hz
C
dBs
00Hz
NOTE :
Symbol indicates a resistor.
No differentiation is made between chip resistors and
Decimal points for resistor D
and capacitor fixed values
0dBs =0.775 Vrms discrete resistors. are expressed as :
-20dBs=77.5 mVrms Symbol indicates a capacitor. 2.2 2R2
No differentiation is made between chip capacitors and 0.022 R022
discrete capacitors.
5 6 7
A 8
17
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
1
A-a A-b
A
B
-25.1dBs
-24.0dBs
C
D
18
A-a
1 2 3 4
-21.2dBs
-25.2dBs 500Hz
500Hz
5
5
2
-18.4dBs
-22.7dBs 500Hz
500Hz
3
4
6
6
7
7
8
8
A-a
A-a A-b
19
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
B
D
C
B
A
D
C
20
A-a A-b
1
1
A-b
BALANCE INPUT
-20dBs f-500Hz
2
2
A AMP UNIT
-25.2dBs
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
3
3
BALANCE OUTPUT
front:+5.2dBs f-500Hz
rear:+7.7dBs f-500Hz
4
4
1
-21.2dBs
500Hz
5
5
2
-18.4dBs
500Hz
3
4
6
6
NOTE :
Symbol indicates a resistor. Decimal points for resistor
No differentiation is made between chip resistors and and capacitor fixed values
7
7
0dBs =0.775 Vrms discrete resistors. are expressed as :
-20dBs=77.5 mVrms Symbol indicates a capacitor. 2.2 2R2
No differentiation is made between chip capacitors and 0.022 R022
discrete capacitors.
8
8
A-b
A-a A-b
21
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
B
D
C
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
4. PCB CONNECTION DIAGRAM
A
4.1 MAIN UNIT(GM-8706ZT/UC), AMP UNIT(GM-8306ZT/EW)
NOTE FOR PCB DIAGRAMS
1. The parts mounted on this PCB 2. Viewpoint of PCB diagrams
include all necessary parts for
several destination. Connector Capacitor
For further information for
SIDE A
respective destinations, be sure
to check with the schematic dia-
gram.
P.C.Board Chip Part SIDE B
MAIN UNIT(GM-8706ZT/UC)
A AMP UNIT(GM-8306ZT/EW)
B
C
D
22 A1 2 3 4
5 6 7 8
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
SIDE A
B
C
D
5 6 7
A 8
23
1 2 3 4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
MAIN UNIT(GM-8706ZT/UC)
A AMP UNIT(GM-8306ZT/EW)
B
C
D
24 A1 2 3 4
5 6 7 8
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
SIDE B
B
C
D
5 6 7
A 8
25
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
5. ELECTRICAL PARTS LIST
NOTE:
- Parts whose parts numbers are omitted are subject to being not supplied.
- The part numbers shown below indicate chip components.
Chip Resistor
RS1/_S___J,RS1/__S___J
Chip Capacitor (except for CQS.....)
CKS....., CCS....., CSZS.....
=====Circuit Symbol and No.===Part Name Part No. =====Circuit Symbol and No.===Part Name Part No.
--- ------ ------------------------------------------ ------------------------- --- ------ ------------------------------------------ -------------------------
A Unit Number : CWM7316(GM-8706ZT/UC) Q 820 Transistor DTA114EK
D 621 Diode ERA15-02VH
Unit Name : Main Unit D 622 Diode UDZ5R6(B)
D 624 Diode MA3180(M)
MISCELLANEOUS D 625 Diode MA3180(M)
IC 101 IC NJM2068MD
D 641 Diode RD8R2M(B1)
IC 104 IC PMJ002A
D 642 Diode 1SS355
IC 201 IC NJM2068MD
D 646 Diode RD7R5M(B3)
IC 202 IC NJM2068MD
D 801 Diode 5KP24A
IC 203 IC NJM2068MD
D 802 Diode HZU4R3(B3)
IC 204 IC NJM2068MD
D 803 Chip Diode MA151WK
IC 401 IC TDA7384
D 805 Chip Diode MA151WK
IC 501 IC NJM2068MD
D 806 Chip Diode MA151WK
IC 502 IC NJM2068MD
D 807 Chip Diode MA151WK
IC 503 IC TA8221AH1
D 808 Diode 1SS355
IC 601 IC PD5607B
D 809 Diode RD8R2M(B1)
IC 602 IC CA0008AM
D 830 Chip Diode MA151WK
IC 603 IC S-80740AND4I
L 631 Inductor LCTB100K2125
IC 801 IC NJM2930F08K
L 801 Choke Coil 0.6mH CTH1169
Q 141 Transistor DTC323TK
X 601 Ceramic Resonator 6.290MHz CSS1305
Q 142 Transistor DTC323TK
Q 143 Transistor DTA114EK
Q 221 Transistor 2SC3929
RESISTORS
Q 222 Transistor 2SC3929
R 101 RS1/10S472J
Q 223 Transistor 2SC3929
R 102 RS1/10S472J
R 103 RS1/10S472J
Q 224 Transistor 2SC3929
R 104 RS1/10S472J
Q 225 Transistor 2SC3929
R 105 RS1/10S912J
Q 226 Transistor 2SC3929
Q 227 Transistor 2SC3929
R 106 RS1/10S912J
Q 228 Transistor 2SC3929
R 107 RS1/10S912J
R 108 RS1/10S912J
Q 321 Transistor 2SC3929
R 109 RS1/10S473J
Q 322 Transistor 2SC3929