Pioneer Lexus RX300 User manual

ORDER NO.
CRT2496
PUB. NO. CRT2496
AUDIO SYSTEM
POWER AMPLIFIER
Manufactured for TOYOTA
by PIONEER CORPORATION
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
RX300
Service
Manual

2
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
2. EXPLODED VIEWS AND PARTS LIST ......................4
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM ....8
4. PCB CONNECTION DIAGRAM................................22
5. ELECTRICAL PARTS LIST........................................26
6. ADJUSTMENT.........................................................33
7. GENERAL INFORMATION.......................................34
7.1 DIAGNOSIS .......................................................34
7.1.1 DISASSEMBLY.........................................34
7.1.2 CONNECTOR FUNCTION DESCRIPTION ......35
7.2 IC ........................................................................36
7.3 EXPLANATION...................................................39
7.3.1 OPERATIONAL FLOW CHART .................39
7.3.2 SYSTEM BLOCK DIAGRAM.....................40
8. SPECIFICATIONS .....................................................41

3
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.

4
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
2. EXPLODED VIEWS AND PARTS LIST
2.1 EXTERIOR (GM-8706ZT/UC)

5
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
1 Screw BMZ30P060FMC
2 Screw See Contrast table(2)
3 Screw(M2.6x14) CBA1384
4 Screw(M3x14) CBA1427
5 Chassis CNA1938
6 Case CNB2186
7 86285-48030 See Contrast table(2)
* 8 Seal CNM5381
* 9 Heat Sink CNR1446
10 Main Unit CWM7316
11 Screw(M3x6) CBA1393
12 Connector(CN101) CKM1074
13 Connector(CN102) CKM1222
14 Bracket CNC7145
15 Holder CNC7146
16 IC(IC401) TDA7384
17 IC(IC503) TA8221AH1
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.
(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

6
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
2.2 EXTERIOR (GM-8306ZT/EW)

7
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
1 Screw BMZ30P060FMC
2 Screw See Contrast table(2)
3 Screw(M2.6x14) CBA1384
4 Screw(M3x14) CBA1427
5 Chassis CNA1938
6 Case CNB2186
7 86285-48030 See Contrast table(2)
* 8 Seal CNM5381
* 9 Heat Sink CNR1446
10 Amp Unit CWM7099
11 Screw(M3x6) CBA1393
12 Connector(CN101) CKM1074
13 Connector(CN102) CKM1222
14 Bracket CNC7145
15 Holder CNC7146
16 IC(IC401) TDA7384
(1) EXTERIOR SECTION PARTS LIST
Mark No. Description Part No. Mark No. Description Part No.
(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

8
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM (GM-8706ZT/UC)
IC201
NJM2068MD
2
31IC203
NJM2068MD
31
IC202
NJM2068MD
3
21IC204
NJM2068MD
31
IC104
PMJ002A IC401
TDA7384
IC503
TA8221AH1
IC502
NJM2068MD
IC501
NJM2068MD
IC801
NJM2930F08K
AMPLIFIER
CONTROL
IC601
PD5607B
IC603
S-80740AND4I
IC602
CA0008AM
Q811
B.U
5VD
5VD
B.U
B.U
AUDIO
+B
AUDIO
+B
B.U
IC101
NJM2068MD
CUT
Q221,225
BOOST
Q223,227
BOOST
Q323,327
CUT
Q321,325
CN101
L+
L-
CDL- CDL+
MUTE
EMUT
TX+
TMUT
TX-
2
1
3
Q805 Q143
Q141
PMUTE
42
VDT
VCK
VST
B
BEEP
30
29
FIX EQ
FIX EQ
POWER AMP
12
15
22 4
19
17
3
5
FLIN
RLIN
mute stby
Q820 Q810
Q809
CN102
RL+
FL+
FL-
RL-
WF-
WF+
+B
ACC
RL+
L801
Q803
Q804
MUTE2
WOOFER
WOOFER
POWER AMP
Q501
WOOFER
MUTE
2
7
16
15
4
STBY
STBY
WFSTBY
Q646
BSENSE
1
3
7
5
7
5
1
2
Q807
Q801
Q802
BEEP
B
13
22
24
16
23
25
5
4
3
MUTE1
MSENS
SYSPW
MUTE2
reset
AVCPW
AVCOUT
AVCIN
VDT/VCK/VST
BEEP
15
14
28
29
BSEN
ASEN
XIN
XOUT
Q641
ASNSE
X601
6.290MHz
TMUTE
MSENSE
Q806
1
2
3
Q812 Q808
8V REGULATOR
MUTE
WFSTBY
5V REGULATOR
RESET
Q621
21
RESET
TX+
TX-
6
5
81
2
<MUTE2>
<MUTE1>
<RL>
<FL>
<BEEP>
<MSEN>
<STBYWF>
<MUTE2>
<MUTE2>
<FL>
<RL>
AMAIN UNIT

9
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
1234
A
B
C
D
1234
IC201
NJM2068MD
2
31IC203
NJM2068MD
31
IC202
NJM2068MD
3
21IC204
NJM2068MD
31
IC104
PMJ002A IC401
PAL006A
IC801
NJM2930F08K
AMPLIFIER
CONTROL
IC601
PD5607B
IC603
S-80740AND4I
IC602
CA0008AM
Q811
B.U
5VD
5VD
B.U
B.U
AUDIO
+B
B.U
IC101
NJM2068MD
CUT
Q221,225
BOOST
Q223,227
BOOST
Q323,327
CUT
Q321,325
CN101
L+
L-
CDL- CDL+
MUTE
EMUT
TX+
TMUT
TX-
2
1
3
Q805 Q143
Q141
PMUTE
42
VDT
VCK
VST
B
BEEP
30
29
FIX EQ
FIX EQ
POWER AMP
12
15
22 4
19
17
3
5
FLIN
RLIN
mute stby
Q820 Q810
Q809
CN102
RL+
FL+
FL-
RL-
+B
ACC
RL+
L801
STBY
Q646
BSENSE
Q807
Q801
Q802
BEEP
B
13
22
24
16
23
25
5
4
3
MUTE1
MSENS
SYSPW
MUTE2
reset
AVCPW
AVCOUT
AVCIN
VDT/VCK/VST
BEEP
15
14
28
29
BSEN
ASEN
XIN
XOUT
Q641
ASNSE
X601
6.290MHz
TMUTE
MSENSE
Q806
1
2
3
Q812 Q808
8V REGULATOR
MUTE
5V REGULATOR
RESET
Q621
21
RESET
TX+
TX-
6
5
81
2
<MUTE2>
<MUTE1>
<BEEP>
<MSEN>
<MUTE2>
<MUTE2>
AAMP UNIT
3.2 BLOCK DIAGRAM (GM-8306ZT/EW)

10
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
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”.
-25.4dBs
-29.0dBs
1kHz
-25.5dBs
1kHz
woofer:
-22.0dBs 50Hz
-14.5dBs 50Hz
-13.5dBs 50Hz
-24.5dBs 50Hz
-25.5dBs
-24.0dBs
A-a A-b
A-a A-b
A-b
A-a
Large size
SCH diagram
Guide page
Detailed page
A
A-a

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.
AMAIN UNIT
0dBs =0.775 Vrms
-20dBs=77.5 mVrms
BALANCE INPUT
-20dBs f-1kHz
f-50Hz
BALANCE OUTPUT
front:+1.0dBs f-1kHz
rear:+4.0dBs f-1kHz
woofer:+10.0dBs f-50Hz
+1.0dBs
-25.5dBs
front:
-24.8dBs
rear:
-22.0dBs
11
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
5678
A
B
C
D
5678
A-b
A

12
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
front: -24.8dBs
-25.4dBs
-29.0dBs
1kHz
-24.0dBs
A-a A-b
A-a
1

13
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
5678
A
B
C
D
5678
A-a A-b
rear: -22.0dBs
-25.5dBs
1kHz
woofer:
-22.0dBs 50Hz
-14.5dBs 50Hz
-13.5dBs 50Hz
-24.5dBs 50Hz
-25.5dBs
A-a
2
3
4

14
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
A-a A-b
AMAIN UNIT
BALANCE INPUT
-20dBs f-1kHz
f-50Hz
BALANCE OUTPUT
front:+1.0dBs f-1kHz
rear:+4.0dBs f-1kHz
woofer:+10.0dBs f-50Hz
+1.0dBs
-25.5dBs
front: -24.8dBs
A-b
1

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.
0dBs =0.775 Vrms
-20dBs=77.5 mVrms
rear: -22.0dBs
15
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
5678
A
B
C
D
5678
A-a A-b
A-b
2
3
4

16
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
-21.2d
500
-25.1dBs
-25.2dBs
500Hz
-22.7dBs
500Hz
-24.0dBs
-21.2d
500
-18.4dB
500H
A
A-a
3.4 SCHEMATIC DIAGRAM (GM-8306ZT/EW)

17
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
5678
A
B
C
D
5678
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.
AAMP UNIT
BALANCE INPUT
-20dBs f-500Hz
BALANCE OUTPUT
front:+5.2dBs f-500Hz
rear:+7.7dBs f-500Hz
-25.2dBs
2dBs
00Hz
2dBs
00Hz
dBs
00Hz
0dBs =0.775 Vrms
-20dBs=77.5 mVrms
A-b
A

18
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
-25.1dBs
-24.0dBs
A-a A-b
A-a
1

19
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
5678
A
B
C
D
5678
A-a A-b
-21.2dBs
500Hz
-25.2dBs
500Hz
-22.7dBs
500Hz
-21.2dBs
500Hz
-18.4dBs
500Hz
A-a
2
3
4

20
GM-8706ZT,8706ZT-91,8306ZT,8306ZT-91
A
1234
B
C
D
1234
A-a A-b
AAMP UNIT
BALANCE INPUT
-20dBs f-500Hz
BALANCE OUTPUT
front:+5.2dBs f-500Hz
rear:+7.7dBs f-500Hz
-25.2dBs
A-b
1