Harman JBL GTO-751EZ Manuale utente

Service Manual

GTO-751EZ

subwoofer ampliﬁer

- CONTENTS -

SPECIFICATIONS ………………………………………..2

CONNECTIONS……………………………………………3

BASIC TROUBLESHOOTING… ………………..……....6

PACKAGING EXPLODED VIEW ……………................7

EXPLODED VIEW …..………....…….….….…………....8

ELECTRICAL PARTS LIST……………………………....9

PCB DRAWINGS…………….……….……….…….……19

BLOCK DIAGRAM…………………………....….....……21

SCHEMATIC………..….…….……………….…...….…..22

GTO-751EZ

Number of Channels: 1

Power Output (CEA 2006A): 500W RMS x 1 channel at 4 ohms, 14.4V DC, <1.0% THD

750W RMS x 1 channel at 2 ohms, 14.4V DC, <1.0% THD

Max Power: 1200W x 1 channel at 2 ohms (50Hz), 15.5V DC, 10% THD

Frequency Response: 10Hz – 280Hz (±3dB)

Signal-to-Noise (@ 1W): > 80dB

Maximum Current Draw: 70A

Fuse Replacement: 40A x 2

Dimensions (D x H x W): 11-15/16" x 2-9/16" x 9-11/16" (302mm x 66mm x 246mm)

Weight: 9.0 lb (4.1kg)

GTO-751EZ

CONNECTING THE POWER AND GROUND

The GTO subwoofer amplifiers are capable of delivering extremely high power levels, and require a heavy-duty and

reliable connection to the vehicle’s electrical system to achieve optimal performance. Please adhere to the following

instructions carefully.

Using the Connectors

GTO subwoofer amplifiers use the same type of screw terminals for power and speaker connections. This type of

terminal is easy to use, provides superior current transfer and allows the easy connection of large-gauge wire.

To use the connectors, use a Phillips screwdriver to loosen the connector’s set screw, insert the bare wire and tighten

the set screw to secure the wire in the connector.

Loosen

Screw

Insert

Wire

Tighten

Screw

Ground Connection

Connect a wire (minimum 6AWG – 13.2mm2– for the GTO-1001EZ; minimum 8AWG – 8.4mm2– for the GTO-751EZ

and GTO 501EZ) from the amplifier’s GND terminal directly to a solid point on the vehicle’s chassis. For a good

connection, use sandpaper to clear the paint from the metal surface at this chassis location. Use a star-type lock

washer to secure the wire’s connection.

Power

Connectors

Audio System Head Unit

Remote Turn-On (optional)

>#18 AWG (0.82mm2) Wire

>#6AWG (13.2mm2) Wire – GTO-1001EZ

>#8AWG (8.4mm2) Wire – GTO-751EZ/

GTO-501EZ

+12V

18"

(46cm)

>#6AWG (13.2mm2) Wire – GTO-1001EZ

>#8AWG (8.4mm2) Wire – GTO-751EZ/

GTO-501EZ

120A Fuse (GTO-1001EZ)

80A Fuse (GTO-751EZ)

50A Fuse (GTO-501EZ)

Chassis Ground

(bare metal)

GTO-751EZ

Power Connection

1. Connect a wire (minimum 6AWG – 13.2mm2– for the GTO-1001EZ; minimum 8AWG – 8.4mm2–for the

GTO-751EZ and GTO-501EZ) directly to the battery’s positive (+) terminal.

2. Install a fuse holder for a 120A fuse (GTO-1001EZ), 80A fuse (GTO-751EZ) or 50A Fuse (GTO-501EZ) on this wire

within 18" (46cm) of the battery’s (+) terminal. Do not install the fuse in the holder at this time.

3. Route this wire to the amplifier’s location and connect it to the amplifier’s +12V terminal. Be sure to use

appropriate grommets whenever routing wires through the firewall or other sheet metal. IMPORTANT: Failure to

adequately protect the positive wire from potential damage may result in a vehicle fire.

4. When you are finished routing and connecting this wire, install the appropriate fuse in the holder you installed near

the battery. (GTO-1001EZ = 120A fuse; GTO-751EZ = 80A fuse; GTO-501EZ = 50A fuse.)

SUBWOOFER CONNECTION

Connect the subwoofer to the amplifier’s Sub (+) and (–) terminals.

Subwoofer

GTO

Subwoofer Ampliﬁer

Always connect the (+) terminal on the amplifier to the (+) terminal on the subwoofer and the (–) terminal on the

amplifier to the (–) terminal on the subwoofer.

IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other or the other terminal at both the amplifier

terminals and subwoofer terminals. Touching wires can cause a short circuit that can damage the amplifier.

NOTE: The minimum subwoofer impedance is 2 ohms.

CONNECTIONS

IMPORTANT: Disconnect the vehicle’s negative (–) battery terminal before beginning the installation.

If you have not already done so, remove the two end caps that cover the amplifier’s connectors as explained in

Mounting the Amplifier, above. This will provide easier access to all of the amplifier’s connectors.

AUTO TURN-ON SWITCH

No remote turn-on connection is necessary because GTO amplifiers include signal-sensing turn-on, which will turn

the amplifier on when it receives an audio signal at any of its input connectors. The amplifier will automatically turn off

approximately five minutes after the input signal ceases.

If your audio system’s source unit includes a remote turn-on wire and you would prefer to use it, the amplifier

will sense that you’ve used a remote turn-on wire and that connection will override the signal-sensing turn-on. If

necessary, you can defeat the signal-sensing turn-on circuit by moving the Auto Turn-On switch to the “Off” position.

GTO-751EZ

INPUT CONNECTIONS

Input Connectors

Use RCA audio cables to connect source units with preamp-level outputs to the amplifier; use the supplied bare wire-

to-RCA adapters to connect to source units that don’t have RCA output connectors.

Use a small Phillips screwdriver to loosen the adapter’s set screws and insert the speaker wires into the holes on the

back of the adapter. Tighten the set screws to secure the wires.

Loosen

Screw

Insert

Wire

Tighten

Screw

Always connect the (+) speaker wire to the (+) terminal on the adapter and the (–) speaker wire to the (–) terminal on

the speaker.

IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other. Touching wires can cause a short circuit

that can damage the source unit or the amplifier.

When you’re finished, plug the adapter into the appropriate input connector on the amplifier.

• You can use either input connector to connect a source component with a single mono subwoofer output.

BASS BOOST

The Bass Boost control provides up to 12dB of bass boost at 45Hz. Set this control according to your personal taste,

but be careful not to set the control at a high enough level to cause audible distortion or bottoming of your subwoofer.

POWER/PROTECTION LED

Power/

Protection

LED

The GTO amplifier Power/Protection LED’s color indicates the amplifier’s operational status:

• LED is orange: Normal operation (power is on)

• LED is off: Amplifier is in standby mode

• LED is red: Amplifier is in protect mode

If the amplifier is in the protect mode (the LED is red), see Troubleshooting, on page 9.

GTO-751EZ

TROUBLESHOOTING

If your amplifier isn’t performing the way you think it should, check to see if the problem is covered in this section

before calling your dealer or contacting JBL customer service.

PROBLEM CAUSES AND SOLUTIONS

No sound (the amplifier’s

Power/ Protection LED is off):

• Check that the amplifier’s +12V and GND connections have been properly

made.

• Check if the fuse on the +12V wire located near the battery is blown; if so,

replace it with an identical fuse.

• Check all amplifier fuses; if any are blown, replace them with identical fuses.

• If you are using the amplifier’s REM connection for turn-on, check that the

wire is properly connected to the audio system’s remote turn-on wire or to the

vehicle’s ACC power terminal.

• If you are using the amplifier’s Auto Turn-On circuit for turn-on, check that the

amplifier’s Auto Turn-On switch (on the amplifier’s bottom panel) is set in the

“On” position.

No sound (the amplifier’s

Power/ Protection LED is

orange):

• Check that all amplifier input and speaker connections have been properly

made.

• Check that the amplifier’s Gain control is not turned all the way down.

• Check that the vehicle audio system’s source unit’s volume control is not

turned all the way down.

• If you have connected an optional Remote Bass Control (sold separately)

to the amplifier, check that it is not turned all the way down (fully

counterclockwise).

No sound (the amplifier’s

Power/ Protection LED is red):

• Confirm that the vehicle’s electrical system is supplying between 9V and 16V

DC to the amplifier. If the supply voltage is outside of this range, correct the

condition before attempting to use the amplifier.

• If the amplifier has overheated, wait until it has cooled down before attempting

to use it again.

• Disconnect all speakers from the amplifier and attempt to turn it on again:

– If the amplifier turns on (the Power/Protect LED is orange), there is a short

circuit in one or more of the speaker wires. Correct all short circuits before

reconnecting the speakers to the amplifier.

– If the amplifier does not turn on (the Power/Protect LED is still red), contact

your authorized JBL dealer for assistance.

• If the optional Sub Channel Level control is connected to the amplifier, check

that it is not turned all the way down (fully counterclockwise).

Sound is too quiet, even with the

vehicle audio system’s head unit

volume turned all the way up:

• Check the amplifier’s Input Level switch. If it is set to “Hi1,” turn the amplifier’s

Gain controls all the way down and re-set the Input Level switch to “Low.”

Then perform the Set the Gain procedure, on page 7, again.

Sound in the subwoofer is

distorted:

• If the Input Level switch is set in the “Low” position, change the setting to “Hi1”

and perform the Set the Gain procedure, on page 7, again for those channels.

• While listening to bass-heavy music, turn the Bass Boost control all the way

down, and then gradually increase it until the distortion begins to return.

Reduce the Bass Boost control setting slightly to eliminate the distortion and

leave it set there.

• Check that the distortion is not originating from the vehicle audio system’s

source unit.

The amplifier’s Gain LEDs

constantly illuminate red while

the amplifier is operating:

• Set the amplifier’s Gain LEDs switch in the “Off” position.

GTO-751EZ

BZ0302000007

WX0302000264

CH0102000313

LP0202000004

LP0102000611

LP0302000015

BZ0502000001

221903000014

121103000099

BZ0202000186

BZ0202000184

BZ0102000142

AGTO751M0002

TZ0302000593

TZ0302000609

TZ0302000610

BZ0302000004

TZ0302000602

GTO-751EZ Packaging exploded view

Foam bag

Foam left

Foam right

Carton

Giftbox

ranar ty

Manual

PE Bag

mainframe

EV0022-00001

15 Serial labels RCA terminal and drier

barcode label

EV0022-00001

Carton barcode label

Barcode labels 42 * 70mm per dosage 1 PCS,

each box stick 4 PCS are the same.

Carton barcode labels 110 * 80mm per dosage 1 PCS,

each box stick 2 PCS are the same.

barcode label

8CD Bag

NO.

PART NO.

PART

NAME

Mainframe

Foam Left

RCA terminal

CD Bag

Warranty card

Manual

Drier

Foam Right

Giftbox

Carton

PE Bag

Foam bag

Barcode labels

Serial labels

Barcode labels

PE Bag

Carton barcode label

QTY.

1/1

2/1

1/1

2/1

1/1

2/1

1/1

REMARK

Casing mainframe

Each box stick 2 PCS

30*5MM

50*15MM

42*70MM

110*80MM

Each box stick 1 PCS

Casing RCA terminal

6PE Bag

Casing CD

Casing manual and warranty

Note:Asia and Europe without warranty card!

751

GTO-751EZ

p/n name spec qty position

AGTO751M0002 GTO-751EZ Harman-US,GTO-751EZ, 1

88AM03200264 PCBA semi-finished

products

GTO-751EZ,AMP board,DIP process

test 1

1.20203E+11 RCA jacks AV2,-8.4-13AN (WR) 2 holes on the

white the red 4-pin 1 RCA1

1.21103E+11 Phone jack 6PIN black 90 1 JK5

10803000011 Manganin

resistance

DIP 10 milliohms ± 1% of Manganese

Bronze to resistance Ɏ1.5 feet away

from the H is for 10.5MM 16.5MM

3 R180,R181,R182

30503000001 Common-mode

inductance

Three-phase inductance ĭ28 * 12mm

(ĭ1.0 * 6P) * 2 +1.0 * 1P vertical core

K5A 13uH 7.5uH

1 L1P

20733000023 Metal membrane

capacitance

DIP 104/250V ± 5% brown braid feet

away from 5mm 4 C101,C102,C103,C124

20733000024 Metal membrane

capacitance

DIP 105/63V ± 5 feet away from the

5MM knitting belt brown MAX: 10.5MM *

10.5MM * 6.0MM

1 C25

30603000036 Common-mode

inductance

DIP 35uH core 17.5 * 9.5 * 20mm ĭ0.5 *

8P * 6TS vertical 4-pin 1L6

10403000110 Metal oxide film

resistors DIP 2W 120ȍ± 5% braid 2 R161,R162

2.21103E+11 Relay Manufacturers Model: YL-224-C DC12V

30A transformational 1 RL1

10403000046 Metal oxide film

resistors DIP 2W 2.2K ± 5% braid 1 R151

20733000027 Metal membrane

capacitance

DIP 224/100V ± 5% brown braid pitch

5mm miniaturization 3C133㧘C135㧘C134

20513000204 Electrolytic

capacitor

DIP 330uF/35V ± 20% Ɏ8 * 16MM 105

Black 3 C95,C96,C68

20733000018 Metal membrane

capacitance

DIP 335/100V ± 10% 105 ° C brown feet

away from 20.5mm 4 C129,C130,C131,C132

20733000019 Metal membrane

capacitance

DIP 335/250V ± 10% 105 ° C brown feet

away from the 27mm 1 C122

10403000055 Metal oxide film

resistors DIP 2W 4.7ȍ± 5% braid 1 R150

1.20103E+11 Fuseholder The DIP 2PIN combination to use BXS2-

09 1F1

10403000114 Metal oxide film

resistors DIP, 43Kȍ, 2W, braid type, ± 1%, 1 R146

10403000096 Metal oxide film

resistors DIP 2W 470ȍ± 5% horizontal tall 10mm 1 R149

10503000018 Cement Resistor DIP 5W 47ȍ± 5% (vertical) two feet 1 R152

50703000011 Optical coupling 4N35 DIP6 1 U13

1.40203E+11 Fuse DIP 40A/32V high temperature UL

certification Littelfuse Blade 2

10403000120 Metal oxide film

resistors DIP, 6.8Kȍ, 2W, braid type, ± 5%, 2 R124,R127

40103000050 Rectifier diode DIP 6A10 1000V brand㧦ᐔᵗ 1 D19

1.21103E+11 socket DIP,11PIN⋥ឯ,2.54mm, DIP, 11PIN

DIP, 2.54mm, 1 JP10

GTO-751EZ

p/n name spec qty position

1.70503E+11 Shielded cable

1533 #28/㧔1C+S㧕㧖㧞ዳ⭁优႕ۥ+UL

2468

#26/7P任ػඈ,11PIN,2.54MM,L=100MM

,෺㢎䬈XH┵ሶ, 1533 # 28 / (1C + S) * 2

shielded cable Black + UL # 2468 26/7P

red and white row, 11PIN 2.54MM, L =

100MM, double-headed with XH

terminal

1.20903E+11 Terminal Blocks DIP, 2PIN, JSZ2-25, black plastic, nickel

plated folding feet 1 JK4

1.21103E+11 Socket DIP, 3PIN, 2.54MM, 1 J0

1.70103E+11 Cable

2468 # 26 red and white cables, 3PIN,

2.54, L = 150mm, both ends of the 2.54

terminal

30503000004 Common-mode

inductance

Four-phase inductance ĭ0.65 * 4P

vertical core K6A ĭ13 * 6 30uH 1L3

60203000097 IC DIP,CJ7812,TO-220,㊄ኽ 叿䶣,1U1

60203000100 IC DIP, CJ7815, TO-220, gold seal long

power 1U3

60203000099 IC DIP, CJ7915, TO-220, gold seal long

power 1U8

40403000032 Bridge rectifiers

DIP, MUR1640CT, AKA, common

cathode, 16A/400V, fast recovery half-

bridge, the TO-220AB, SJ

2 D47,D48

40403000031 Bridge rectifiers

DIP, MUR1640CA, KAK, a total of Yang,

16A/400V, fast recovery half-bridge, TO-

220AB, SJ

2 D49,D50

1.20903E+11 Terminal Blocks

DIP, 3PIN, JSZ3-64A, black nickel-

plated feet fold under the Phillips

screws.

1 JK2

40903000072 LED DIP-color LED red / green 3PIN Yin 1 LED1

1.10103E+11 Band switch DIP,SHC-22P-09,2P2T Handle

length=6MM, 1 SW4

1.10103E+11 Slide switch \DIP, the 4P3T handle long the G8, 23.6

* 9.4 * 12mm 1 SW1S

50403000031 FET DIP AOT460 85A 60V TO-220 N-

CHANNEL 6 M2,M3,M4,M6,M7,M8

20513000436 Electrolytic

capacitor

DIP, 3300uF/25V, 16 * 28 ± 20%, 105 °

C p = 7.5 high-frequency low resistance

<0.03 brand Acon

2 C63,C64

2.00403E+11 High-frequency

toroid transformer Core 47 * 15 4.5T: 22.5T: 7.5T: 7.5T 1 T1

10503000039 Cement Resistor

DIP, 4.7Kȍ, 5W, ± 5% (vertical) two feet

away from 5mm, length 13 * W * H

25mm

1 R148

1.70903E+11 Copper jumper DIPĳ2.6MM, L = 80MM, high 28MM feet

on the tin 2 J2,J3

50403000005 FET DIP IRFB 38N20D TO-220 4 M9,M10,M12,M13

20513000438 Electrolytic

capacitor

DIP, 2200uF100V, 30 * 27 feet away

from the 10mm, ± 20%, 105 ° C 4 C97,C98,C99,C100

1.30213E+11 Socket DIP Pitch 2.5MM 2PIN-line 1 JK3

GTO-751EZ

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