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GTO752

2 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

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- CONTENTS -

SPECIFICATIONS ..1

PACKING......2CONTROL/INSTALLATION DRAWINGS3

CONTROL/INSTALLATION INSTRUCTIONS....4

BASIC TROUBLESHOOTING5

EXPLODED VIEW/PARTS LIST.......6

AMPLIFIER BLOCK DIAGRAM.7

ELECTRICAL PARTS LIST ......8P.C.B. DRAWINGS....11

IC/TRANSISTOR PINOUTS........13

SCHEMATICS........14

GTO 752 Specifications

Output Power: 75W RMS x 2 channels @ 4 ohms; 1% THD + N

(14.4V supply) 110W RMS x 2 channels @ 2 ohms; 1% THD + N

200W RMS x 1 channel (bridged) @ 4 ohms; 1% THD + N

Signal-to-noise ratio: 90dBA (reference 1W into 4 ohms)

108dBA (reference rated power into 4 ohms)

Dynamic power: 130W @ 2 ohms

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1x

4x 1x

12-1/4"

310mm

10-3/8"263mm

2-1/8"53mm

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Installation Warnings and Tips Disconnect the negative () lead from your vehicles

battery.

At the installation sites, locate and make a note ofall fuel lines, hydraulic brake lines, vacuum lines

and electrical wiring. Use extreme caution whencutting or drilling in and around these areas.

Choose a safe mounting location away from moisture.

Make sure there is sufficient air circulation at themounting location for the amplifier to cool itself.

Mount the amplifier, using the supplied hardware.

Specifications 75W RMS x 2 channels @ 4 ohms and 1% THD + N*

110W RMS x 2 channels @ 2 ohms and1% THD + N*

THD + N: 0.07% (rated power @ 4 ohms)

Signal-to-noise ratio: 90dBA(reference 1W into 4 ohms)*

Signal-to-noise ratio: 108dBA(reference rated power into 4 ohms)

Frequency response: 10Hz 100kHz (3dB)

Max power: 220 watts

* CEA-2006A-compliant

Speaker Output Connectors Connect the speakers to these terminals,

observing proper polarity.

Two-channel operation: Connect the leftspeaker to the L+ and L terminals and the

right speaker to the R+ and R terminals. One-channel (bridged) operation: Connect the

single speaker to the R+ and L terminals.

Minimum speaker impedance for 2-channeloperation is 2 ohms. Minimum speaker impedancefor 1-channel (bridged) operation is 4 ohms.

Fuses Replace only with the same type and rating.

Power Input Connectors +12V: Connect to the positive terminal of the

vehicles battery. 10 AWG wire is recommended.Install an appropriate fuse holder and fuse (30A

minimum) within 18 inches of the battery. Makesure the wire is not damaged or pinched duringinstallation. Install protective grommets whenrouting wires through the firewall or other sheetmetal.

GND: Connect to the vehicles chassis. Refer tothe picture below.

REM: Connect to the Remote Out lead fromthe source unit or to a source of switched12V+ (ACC).

Aux Output Connectors (RCA)

Crossover-Filter Selector LPF: Select for subwoofer(s).

FLAT: Select for full-range speakers whenno subwoofer will be used in the system.

HPF: Select for midrange speakers or

full-range speakers when a subwoofer isused in the system.

Bass-Boost Control Set the Bass-Boost control according to your

preference, being careful not to applyenough boost to damage your speaker(s).

Power On LED Illuminated when the amplifier is on.

Protect LED Illuminated under any of the following fault

conditions: battery over/under voltage, shortcircuit in speaker wires, amplifier is too hot,

amplifiers output circuit has failed (DC voltageis present in the amplifiers output).

Setting Input LevelA Turn Input-Level control counterclockwise to

6V (minimum).

BWith a dynamic music track playing, turn thehead units volume control to the 3/4 position.

C Turn Input-Level control clockwise until themusic is so loud that it no longer sounds clear(distortion is present in the output).

D Turn Input-Level control counterclockwisegradually, just until the music sounds clear,once again.

E Input level is now adjusted correctly. Setting the CrossoverA Crossover setting for 5" or larger full-range

speakers when no subwoofer is included inthe system.

B Crossover setting for midrange and/orfull-range speakers when a subwooferis included in the system.

C Crossover setting for subwoofers.N t A t bl f i di t d

GTO752 CAR AUDIO POWER AMPLIFIER OWNERS MANUAL

Factory Bolt Ring Connector

Ground Wire

Note: Remove any paintbelow ring connector.

Star Washer

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Amplifier Troubleshooting Guide

1. Status LED on Amplifier not Lit - Head Unit (Source) Turned ONVerify:

A. Remote turn-on wire from source to amplifier has proper voltageB. Power (B+) connections at amplifier, terminal blocks, and battery are secureC. Ground (GND) connections at amplifier and vehicle chassis are secureD. Battery B+ fuse (if used) is OKE. Amplifier fuse is OKF. B+ at battery and B+ at amplifier has proper voltage

2. Status LEDs Lit, No Output from Speakers in Normal Operating ConditionVerify:

A. RCA cables from amplifier to source are securely connectedB. Volume adjustment on amplifier is correctly adjustedC. Source is ON and playing

3. Engine Noise From Speaker(s)Turn source OFF, Disconnect RCA cables at amplifier. If noise stops, check equipment & cables leadingto amplifier.Verify:

A. RCA cables are of good quality with no breakage to internal shieldsB. RCA cables from source to amplifier are not run alongside any power cables

4 Amplifier Output Distorted Music

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EXPLODED VIEW

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P

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1 2 3 4 5 6

654321

D

C

B

A

INPUT L

AUX OUT L

AUX OUT R

INPUT R

OP

OP

OP

OP

1

3

2

A

1

3

2

A

OP

OP

10 100K 32 32 0

MODE HP/FLAT/LP

VARIABLE LPF/HPF

32Hz-320Hz/12dB

10 100K 32 32 0

MODE HP/FLAT/LP

VARIABLE LPF/HPF

32Hz-320Hz/12dB

10 100K 50

10 100K 50

BASS BOOST

VARIABLE

0dB-6dB/50Hz

BASS BOOST

VARIABLE

0dB-6dB/50Hz

AMP

AMP

MAIN AMP

FRONT L

MAIN AMP

FRONT R

4 ohm/2 ohm

4 ohm/2 ohm

speaker

speaker

speaker

BTL-4ohm

power supply Battery

+VCC

-VCC

+15V

-15V

BLOCK DIAGRAM

7

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GTO752 Electrical Parts List

Part Number Qty Reference Designator

MAIN PCB

Resistors

0702-34R7-02 Resistor 1/2W 4.75% 2 R25B R25C

0702-3220-02 Resistor 1/2W 225% 3 R46 R20 R19

0702-2221-02 Resistor 1/4W 2205% 2 R20B R20C

0702-1220-02 Resistor 1/8W 225% 8 R16C R16B R15C R15B R14C R14B R13B R13C

0702-1470-02 Resistor 1/8W 475% 4 R4B R3C R4C R3B

0702-1101-02 Resistor 1/8W 1005% 6 R38 R39 R40 R41 R12B R12C

0702-1821-02 Resistor 1/8W 8205% 4 R24C R23C R24B R23B

0702-1102-02 Resistor 1/8W 1K5% 16 R227 R226 R119A R17C R17B R2C R2B R1C R1BR120A R111 R106 R28C R27B R27C R28B

0703-1332-03 Resistor 1/8W 3.3K1% 2 R18C R18B

0702-1562-02 Resistor 1/8W 5.6K5% 10R9C R9B R8B R8C R118A R117A R116A R115A R19C

R19B

0702-1472-02 Resistor 1/8W 4.7K5% 3 R2 R32 R37

0702-1103-02 Resistor 1/8W 10K5% 22

R113A R108A R107A R104A R101A R100A R50 R36

R11C R11B R10C R10B R7C R7B R6C R6B R5C R5B

R110A R103A R1 R4D

0702-1473-02 Resistor 1/8W 47K5% 3 R34 R106A R114A

0702-1563-02 Resistor 1/8W 56K5% 6 R56B R56C R222 R221 R323 R3200702-1104-02 Resistor 1/8W 100K5% 5 R52 R55 R43 R217 R216

0702-1221-02 Resistor 1/8W 2205% 2 R112A R105A

0702-1682-02 Resistor 1/8W 6.8K5% 2 R102A R109A

0702-1273-02 Resistor 1/8W 27K5% 2 R127 R128

0703-1301-03 Resistor 1/8W 3001% 2 R231 R241

0702-1223-02 Resistor 1/8W 22K5% 2 R101 R100

0703-1223-03 Resistor 1/8W 22K1% 2 R204 R201

R316 R315 R314 R313 R312 R211 R209 R208 R207

Description

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Part Number Qty Reference Designator Description

MAIN PCB

06D328237200 Capacitor 823/100V 5% 4 C104A C105A C102A C103A

06D232207000 porcelin Cap 22pF/100V 20% 4 C101A C100A C109A C108A

06D231007001 porcelin Cap 10PF/100V 20% 105 4 C227 C226 C215 C214

06D231017000 porcelin Cap 100pF/100V 20% 14C225 C222 C221 C220 C219 C218 C3C C3B C2C C2B

C223 C224 C103A C103B

06D233917000 Capacitor 391/100V 20% 4 C5C C4C C5B C4B

06D234717001 porcelin Cap 470PF/100V 20% 2 C6C C6B

06D231047000 porcelin Cap 0.1uF/100V 20% 17C9 C208 C205 C203 C202 C48 C47 C39 C14 C8 C56

C57 3C 4C C30 C28 C209

06D211076001 Cap electro 100UF/50V 20% 8*12 1055mm 1 C10A

Semiconductors

04WY-51AV104 diode schottky 5.1V DO-35 0.5W 1 ZD2

04WY-15BV204 diode schottky 15V DO-35 1W 2 ZD6 ZD4

04PT-4148-04 diode 1N4148 GSS 200MA 75V DO-35 10 D21 D15 D14 D11 D2C D2B D2 D1C D1B D1

04ZL-5401-06 diode 1N5401 DO-201AD 1 D7

03N2-8050-01 Transistor 2SC8050 NPN TO-92 2 Q8C Q8B

03P1-1015-01 Transistor 2SA1015 150MA 60V 400MW PNP TO-

924 Q9C Q10C Q9B Q10B

03N1-1815-01 Transistor 2SC1815GR 150MA 60V 400MW NPN

TO-92

10 Q23 Q22 Q7C Q7B Q5 Q4 Q2C Q2B Q1C Q1B

03P1-5401-01 Transistor 2N5401 PNP TO-92 2 Q4C Q4B

03P1-B647-01 Transistor 2SB647 1A 120V 0.9W PNP TO-92 2 Q12C Q12B

03N1-5551-01 Transistor 2N5551 NPN TO-92 2 Q11C Q11B

03N1-SA13-01 Transistor MPSA13 0.5A 30V NPN TO-92 2 Q3C Q3B

03N1-667A-01 Transistor 2SD667AC 1A 120V 0.9W NPN TO-92 2 Q5C Q5B

03P1-1023-01 Transistor 2SA1023 TO-92 PNP 1 Q19

03N1-35CW-26 Transistor TIP35CW NPN T0-247 2 Q6C Q6B

03P1-36CW-26 Transistor TIP36CW PNP T0-247 2 Q13C Q13B

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Part Number Qty Reference Designator Description

MAIN PCB

PL-A0050-000 Alum. Bar with Insulated paper 2 14.0x7.0x40.0

PL-A0049-000 Alum. Bar with Insulated paper 1 14.0x7.0x60.0

PWM PCB

Resistors

0701-2221-03 SMD resistor SMD 2201/8W 1% 0805 1 R17

0701-2101-03 SMD resistor SMD 1001/8W 1% 0805 1 R10

0701-2102-03 SMD resistor SMD 1K1/8W 1% 0805 6 R31 R30 R29 R28 R26 R15

0701-2302-03 SMD resistor SMD 3K1/8W 1% 0805 1 R13

0701-2472-03 SMD resistor SMD 4.7K1/8W 1% 0805 1 R11

0701-2682-03 SMD resistor SMD 6.8K1/8W 1% 0805 2 R5 R51

0701-2562-03 SMD resistor SMD 5.6K1/8W 1% 0805 1 R14

0701-2103-03 SMD resistor SMD 10K 1/8W 1% 0805 2 R1 R23





0701-2223-03 SMD resistor SMD 22K1/8W 1% 0805 2 R18 R9



0701-2104-03 SMD resistor SMD 100K1/8W 1% 0805 3 R25 R12 R40701-3102-02 resistor SMD 1K1/4W 5% 1206 8 R1 R2 R3 R4 R5 R6 R7 R8

Capacitors

06D211054104 Cap electro 1uF/25V 20% 4*7 105C 1 C3

06D211074101 Cap electro 100UF/25V 6.3*7mm 5mm 20% 105C 1 C27

06D212273001 Cap electro 220UF/16V 20% 8*7 105C 5MM 1 C22

06D214764103 Cap electro 47UF/25V 20% 6*7 105C black 5mm 2 C1 C20

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87654321

D

C

B

A

C29102/M

R46

22/0.5W

C31

330U/35V

C32

330U/35V

D7

IN5401

123

CN1

R40100

R38100

R41

100

R39

100

C10

NC

C19

NC

PGND

REM

+12V

C14

104P

R50

10K

C39

104P

MUTE

C40100U/25V

CH2OUT

Q4

C1815

Q5C1815

R1922R/0.5W

C6103/M

V+

V-

+VCC

-VCC

D10

U1620

D12U1620R

Q13CET50N60

Q15CET50N60

Q14CET50N60

Q16CET50N60

R20

22R/0.5W

C7103/M

C17

W3300U/25V

CH1OUT

C42

220U/25V

C41

220U/25V

C47104P

C48104P

MUTE

DWGNO:

PARTNO:

C8

104P

C15

22uF/50V

R3447K

R3610K

D3

FR104

R37

4.7K

C18

22uF/25

VNP

R43100K

104P

C9

Q19A1023

R45

3.9K1/4W

AC

C58

2200U/35V

C59

2200U/35V

D5FR104

D6

FR104

D8

FR104

D9

FR104

C38

47U/50V

C55

47U/50V C56

104P

C57

104P

66 5 5

F1C30A

R62

270/2W

R63

270/2W

SPEAKER OUT

D11IN4148

D14

4148 D15

4148

C28

104/P

C30

104/P

1 2L4A

1MH

1 2L6A

1MH

+12V

2C

CL104

1C

CL104

3C

104P

4C

104P

DC

12 L1A

5UH

PRO

1

23

4

CN3

CN3

ZD6

15V1W

ZD4

15V1W

D1

IN4148

V-

AC

2

4

8

6

5

1

3 7

T1

TRANC-1

R52

100K

R55

100K

C37

100UR32

4.7K

D21

4148

Q23

C1815

Q22

C1815

D2

4148

PRO

CH2OUT

CH1OUT

123

4

CN6

CON4

12

34

CN7

CON4

REM

DC12V12V

GND

E2E1

PRO LEDPRO

PRO

+12+12V

LED1

PROR2

4.7K

ZD2

5.1VR4D

10K

DESCRIPTON

+12

1

2

CN5

CON2.54*2

1

2

CN4

CON2.54*2

PRO

R1

10K1

2

CN4

CON2.54*2

RT1

80

1

2

CN5

CON2.54*2

R8

1K

R7

1K

R6

1K

R5

1K

R4

1K

R3

1K

R2

1K

R1

1K

LED8

LED

LED7LED

LED6

LED

LED5

LED

LED4

LED

LED3

LED

LED2

LED

LED1

LED

C10A

100U50V

ECN NO DESCRIPTON DATAAPPROVED

CA2

NC

CA1

NC

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1 2 3 4

4321

D

C

B

A

+

1

-

2

FED

3

DT

4

C

5

R

6

GND

7

OP1

8

+

16

-

15

REF

14

CON

13

VCC

12

OP2

11

E2

10

E1

9

TL494CN U1 TL494

R27

11K

R9

22K

C26

102/M

C27

100/25V

Q10

A1015

R53

15K

C3

1U/50V

PROR30

1K

R31

1K

R28

1K

R29

1K

Q3C1815

R17220R

C25

104

Q2

C1815

R10

100

R114.7K

R13

3K

C2NC

Q6

B649

C147/25V

R110K

R8NC

R26

1K

R4

100K

R24

12K

R23

10K

R12

100K

C22

220/16V

R18

22K

R5

6K8

R3

330K

R51

6K8

R151K

+12

Q1C1815

R718K

DWGNO:

PART NO:

PART NAME:

PRODUCT MODE:

SCALE: 1:1

UNIT: MM

SIZE: A4

REV: PV

DRAWN BY:

CHECKED BY:

APPROVED BY:

DATA:

DATA:

DATA:

POWER1

JBL GTO752

R65

33K

C2047/16V

D14148

D13

4148

D2

4148

D3

4148

D44148

ZD1

15V

ZD2

3V9

+12V

+12

D20

4148

R25

100k

R14

5K6

1234

CN1CON4

123

4

CN2CON4

PRO

REM

DC12V12VGND

E2

E1PRO LED

PRO

Q9A1015

Q8

A1015

C4

104


Q7

C1815

15

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1 2 3 4

4321

D

C

B

A

Q1C

C1815

Q2CC1815

R13C

22R

R16C

22R

R8C

5K6

R1C

1K

V+Q9CA1015

Q10CA1015

R14C

22R

R15C22R

R9C5K6

R2C

1K

V-

Q4C

2N5401

Q11C

2N5551

R3C

47R

R4C

47R

Q3C

A13

R18C3K3

R19C5K6

C2C

100/100V

C3C100/100V

C8C

CL104

C7C

100U/25V

R17C

1K

Q5C

D667

Q12C

B647

Q6C

TIP35C

Q13C

TIP36C

R24C820R

R23C

820R

Q7C

C1815

R10C

10K

C9C1U/50V

PRO

R25C

4.7/0.5W

C10C

CL10

R12C

100R

R7C

10K

C6C

471

MUTE

CH2SG

R26C

5K6

C1C

W10U/50V

R6C10K

CH2OU

R5C

10K

PRO

+VCC

-VCC

CH2OUT

MUTE

CH2SG

R20C

220R 1/4W

R11C

10K

Q8CS8050

+VCC

-VCC

2

3

1

R22C0.10/5W

C4C391/100V

C5C391/100V

DWGNO:

PART NO:

PART NAME:

PRODUCT MODE:

SCALE: 1:1

UNIT: MM

SIZE: A4

REV: PV

DRAWN BY:

CHECKED BY:

APPROVED BY:

DATA:

DATA:

DATA:

AMP-2CH

JBL GTO752

D2C4148

D1C4148

R56C

56KDC

R27C

1K

R28C

1K

C12C

22U

C11C22U


17

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1 2 3 4 5 6

654321

D

C

B

A

R105A

220R

R104A10K

23

1

4

SW100AA

R119A

1KR100A

10K

C100A

22P

R103A

10K

R101A 10K

R115A

5.6K

C102ACL823

R116A

5.6K

C103A

CL823

R102A

6.8K

1 3

2

VR100AA

A50K

4 6

5

VR100AB

A50K

LPF

FLAT

HPF

C108A

22P

CH1

R106A47K

R112A220R67

5

8

SW100AB

R120A

1KR107A

10K

C101A

22P

R110A

10K

R108A10K

R117A

5.6K

C104A

CL823

R118A

5.6K

C105A

CL823

R109A6.8K

7 9

8

VR100ACA50K

10 12

11

VR100AD

A50K

LPF

FLAT

HPFC109A

22P

CH2

R114A47K

R113A

10K

CH1

CH2

DW GNO:

PART NO:

PART NAME:

PRODUCT MODE:

SCALE: 1:1

UNIT: MM

SIZE: A4

REV: 1.0

DRAWN BY:

CHECKED BY:

APPROVED BY:

DATA:

DATA:

DATA:

PRE

JBL GTO752

C106

124

C107563

R12727K

+V

-V

C131

124

C130563

R128

27K

LED2

LED

R111

1K

R106

1K

+V

-V

4

6

5

VR101B

B5K

1

3

2

VR101A

B5K

R100

22K

R101

22K

3

21

U100A

4558

3

2

1

U101A

4558

3

21

U102A

4558

5

6

7

8

4

U100B

4558

5

67

8

4

U101B

4558

5

67

8

4U102B

4558

-V

+V

-V

+V

3

2

1

U103A

4558

5

67

8

4

U103B

4558 -V

+V

CH2SG

CH1SG

C205104P

C208104P

C209

104P

C20310P

C202104P

V+

R207 10K

R20122K

C216

220U/25VNP

C218100P

R20810K

R20010K

INPUT

C200W22U/50V

C214CC10P

C219100P

C201W22U/50V

R20210K

R20910K

R20422K

C217

220U/25NP

C220 100P

R21110K

R20310K

INPUTC206

W22U/50V

C215CC10P

C221100 P

C207W22U/50V

R20510K

-V

+V

3

21U201A

NJM4558

5

6

7

8

4

U201B

NJM4558

1

2

CH1-in

5

6

CH2-inFL

FR

R2244K7

R229

4K7

13

2

VR200A B20K

46

5

VR200B B20K

R2104K7

R241300R

R2304K7

R231300R

C227 10P

C222100P

C225100P

5

67

8

4

U202BNJM4558

3

21

U202A

NJM4558

-V

+V

CH2

CH1

3

4

R-OUT

7

8

L-OUTR323

56K

R320

56K

R221 56K

R222 56K

C224 100/ P

C223 1 00/ P

R2261K

R2271K

C211W22U/50V

C212W22U/50V

R217100K

R216100K

3

21

U200A

NJM4558

5

67

8

4

U200B

NJM4558+V

-V

FR

FL

FR

FL

3

21

U302A

NJM4558

R31410K

R31210K

R313

10K

V-

V+

5

67

8

4

U302B

NJM4558

R315

10K

R31610K


zeng xin hua 2007/0

C130A

100/P

C130B

100/P

Output

Output

18

GTO752

ff6175e4529f0c41_gto752 sm

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