JBL GTO5355 Schematic

GTO5355

5 CHANNEL POWER AMPLIFIER

SERVICE MANUAL

Released 2007
Discontinued XXXX

JBL Consumer Products

250 Crossways Park Dr.

Woodbury, New York 11797 Rev

1 1/2008

1

GTO5355

- CONTENTS -

SPECIFICATIONS ………………………………………..1

PACKING……………………………………………..…....2

CONTROL/INSTALLATION DRAWINGS………………3

CONTROL/INSTALLATION INSTRUCTIONS………....4

BASIC TROUBLESHOOTING…………………..............5

EXPLODED VIEW…….………………….….…………....6

EXPLODED VIEW PARTS LIST………….…….….…....7

AMPLIFIER BLOCK DIAGRAM…………………….……8

ELECTRICAL PARTS LIST ..……….……….…….…….9

P.C.B. DRAWINGS….……………………….....….……15

IC/TRANSISTOR PINOUTS..………………..….….…..18

SCHEMATICS……………………………………….…...19

GTO 5355 Specifications

Output Power: 55W RMS x 4 channels + 225W RMS x 1 channel @ 4 ohms; ≤1% THD+N
(14.4V supply) 75W RMS x 4 channels + 360W RMS x 1 channel @ 2 ohms; ≤1% THD+N
140W RMS x 2 channel (bridged) @ 4 ohms; ≤1% THD + N
Signal-to-noise ratio: 85dBA (reference 1W into 4 ohms)

104dBA (reference rated power into 4 ohms)
Dynamic power: 660W @ 2 ohms
Frequency response: 10Hz – 83kHz and 20Hz – 250Hz (subwoofer)
THD+N 1KHz LPF=22KHz ≤0.03% (rated power @ 4 ohms)
Channel Separation ≥45db (full rated power)
Input Impedance >20K ohms
Maximum input signal: 6.0V
Maximum sensitivity: 100mV
Hi-Pass, Low Pass X-over Limits 32Hz – 320Hz + 20Hz – 200Hz ±20%
Bass Boost @ 50Hz 0-12dB
DC Offset <30mV
Output regulation: .03dB @ 4 ohms
Idle Current @ 4 ohms 1.9A
Max Current Draw <80A @ 2 ohms both channels driven
Remote Operating Voltages ON 5V OFF 4V
Turn-on delay time 2-3 sec
Circuit Protection Temperature (85±5C), Short circuit
Operating voltage range (8-16V)
Dimensions: 18 9/16 x 10 3/8 x 2 1/8” (470 x 263 x 53mm)
Fuses: (2) x 40A

JBL continually strives to update and improve existing products, as well as create new ones. The specifications

and details in this and related JBL publications are therefore subject to change without notice.

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GTO5355

Item Part Number Description Qty

1 CH5523221134 Outer Carton 1
2 BZL311105120 Packing Foam 2
3 GTO5355 Amplifier 1
4 Plastic bag 1
5 Plastic bag 1
6 Visit www.jbl.com Owner’s manual 1
7 Accessory kit consisting of:

LS1AA0404501 Mounting Screws 4
1601-303G-00 30A Fuse 1

REMOTE GTO AMP

Remote Level control 1

2100-0009-04 Phone cable 4PIN Black L=6M, 6P4C 1

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1.000

012

B

A45 6 7 9

ED FG3H I

AB

18-9/16"

470mm

10-3/8"
263mm

2-1/8"
53mm

E

1-5/8"
40mm

1"

25mm

L

C8

2x

2x

4x

1x

1x

1x

ABCDEF

J

K

A

B

C

D

3

GTO5355

Factory Bolt Ring Connector

Ground Wire

Note: Remove any paint
below ring connector.

Star Washer

4

GTO5355

GTO5355 CAR AUDIO POWER AMPLIFIER OWNER’S MANUAL

Installation Warnings and Tips

• Disconnect the negative (–) lead from your vehicle’s
battery.

• At the installation sites, locate and make a note of
all fuel lines, hydraulic brake lines, vacuum lines
and electrical wiring. Use extreme caution when
cutting or drilling in and around these areas.

• Choose a safe mounting location away from moisture.

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

• Mount the amplifier, using the supplied hardware.

Specifications

• 55W RMS x 4 channels, plus 225W RMS x 1 channel,
@ 4 ohms and ≤1% THD + N*

• 75W RMS x 4 channels, plus 360W RMS x 1 channel,
@ 2 ohms and ≤1% THD + N*

• THD + N: 0.03% (rated power @ 4 ohms)

• Signal-to-noise ratio: 85dBA
(reference 1W into 4 ohms)*

• Signal-to-noise ratio: 104dBA
(reference rated power into 4 ohms)

• Frequency response: 10Hz – 83kHz and
20Hz – 250Hz

• Max power: 660 watts

* CEA-2006A-compliant

0

Speaker Output Connectors

• Connect the speakers to these terminals,
observing proper polarity.

• Five-channel operation: Connect the front left
speaker to the Front L+ and L– terminals and
the front right speaker to the Front R+ and
R– terminals. Repeat for the rear speakers,
using the Rear L+ and L– terminals, and
the Rear R+ and R– terminals. Connect the
subwoofer to the Sub+ and Sub– terminals.

• Four-channel operation: Connect the stereo
speakers to the Front terminals, as above.
Connect the single speaker into which the
amplifier’s rear channels will be bridged to the
Rear R+ and Rear L– terminals. Connect the
subwoofer to the Sub+ and Sub– terminals

• Three-channel (bridged) operation: Connect
one speaker to the Front R+ and Front L–
terminals. Connect the other speaker to the
Rear R+ and Rear L– terminals. Connect the
subwoofer to the Sub+ and Sub– terminals.

• Minimum speaker impedance for stereo
operation is 2 ohms. Minimum speaker
impedance for bridged operation is 4 ohms.
Minimum subwoofer impedance is 2 ohms.

1

Fuses

• Replace only with same type and rating.

2

Power Input Connectors

• +12V: Connect to the positive terminal of the
vehicle’s battery. 4 AWG wire is recommended.
Install an appropriate fuse holder and fuse (80A
minimum) within 18 inches of the battery. Make
sure the wire is not damaged or pinched during
installation. Install protective grommets when
routing wires through the firewall or other sheet
metal.

• GND: Connect to the vehicle’s chassis. Refer to
the picture below.

• REM: Connect to the “Remote Out” lead from
the source unit or to a source of switched
12V+ (ACC).

3

Front Input Connectors (RCA)

• Connect to the front RCA outputs from the
source unit or signal processor.

4

Front Input-Level Control

• Used to match the front input level of the
amplifier to the output level of the source unit.

• See Jfor the adjustment procedure.

5

Front Crossover-Frequency Control

• 12dB/octave crossover, variable from
32Hz to 320Hz.

• See Kfor the adjustment procedure.

6

Front Crossover-Filter Selector

• LPF: Select for subwoofer(s).

• FLAT: Select for full-range speakers when
no subwoofer will be used in the system.

• HPF: Select for midrange speakers or
full-range speakers when a subwoofer is
used in the system.

7

Power On LED

• Illuminated when the amplifier is on.

8

Subwoofer Input Connector (RCA)

• Connect to the subwoofer RCA outputs from
the source unit, or signal processor.

9

Rear Crossover-Filter Selector

• LPF: Select for subwoofer(s).

• FLAT: Select for full-range speakers when
no subwoofer will be used in the system.

• HPF: Select for midrange speakers or
full-range speakers when a subwoofer is
used in the system.

A

Rear Crossover-Frequency Control

• 12dB/octave crossover, variable from
32Hz to 320Hz.

• See the adjustment procedure in K.

B

Rear Input-Level Control

• Used to match the rear input of the amplifier to
the output of the source unit.

• See Jfor adjustment procedures.

C

Rear Input Connectors (RCA)

• Connect to rear RCA outputs from the source
unit, or signal processor.

D

EXT/INT Switch

• If the source unit has a subwoofer output and
you have connected it to the SUB input, set this
switch to the EXT position. Otherwise, set it in
the INT position.

E

Subwoofer Remote Level Control Connector

• Connect the Remote Level Control (RLC) here,
using the supplied RJ-11 cable.

F

Subwoofer Level Control

• Used to match the SUB input of the amplifier to
the output of the source unit.

• See Jfor adjustment procedures.

G

Protect LED

• Illuminated under any of the following fault
conditions: battery over/under voltage, short
circuit in speaker wires, amplifier is too hot,
amplifier’s output circuit has failed (DC voltage
present in the amplifier’s output).

H

Subwoofer Low-Pass Filter Frequency Control

• 12dB/octave low-pass filter, variable from 20Hz
to 200Hz.

• See the adjustment procedure in K.

I

DBO (Dynamic Bass Optimization) Variable
Subsonic High-Pass Filter With Variable Boost (Q)

• For woofers in tuned (vented) enclosures, set
the Frequency control to a value 10Hz below the
enclosure’s resonance (tuned) frequency.

• For woofers in sealed boxes, set the control to
any value you prefer between 30Hz and 50Hz.

• Set the Boost control according to your
preference, being careful not to apply
enough boost to damage your woofer(s).

A DBO High-Pass Filter Frequency control,

variable between 10Hz and 100Hz. See
above for appropriate settings.

B DBO Boost control provides up to

12dB of boost, slightly above the high­pass filter’s frequency. See above for
appropriate settings.

J

Setting Input Level

A Turn all Input-Level controls counterclockwise

to 6V (minimum).

B With a dynamic music track playing, turn the

head unit’s volume control to the 3/4 position.

C Turn Front Input-Level control clockwise until

the music is so loud that it no longer sounds
clear (distortion is present in the output).

D Turn Front-Input-Level control counterclock-

wise gradually, just until the music sounds
clear, once again.

E Front-Level input is now adjusted correctly.
F Adjust the Rear and Sub Input-Level controls

so that the level of the rear speakers and the
level of the subwoofer are proportionate to the
level of the front speakers, according to your
preference.

K

Setting the Crossover

A Crossover setting for 5" or larger full-range

speakers when no subwoofer is included in
the system.

B Crossover setting for full-range speakers

when a subwoofer is included in the system.

C Crossover setting for subwoofers.
D Crossover setting for systems that include

separate mid-bass speakers driven by the rear

channels, with the BP switch set to “BP.”
Note: Acceptable frequency ranges are indicated
in gray.

L

Remote Level Control

The Remote Level Control, if installed, will allow
you to adjust the level of bass while seated in the
listening position.

This product is designed for mobile applications and is not
intended for connection to the mains.

A valid serial number is required for warranty coverage.
Features, specifications and appearance are subject to change

without notice.

5

GTO5355

Amplifier Troubleshooting Guide

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

A. Remote turn-on wire from source to amplifier has proper voltage
B. Power (B+) connections at amplifier, terminal blocks, and battery are secure
C. Ground (GND) connections at amplifier and vehicle chassis are secure
D. Battery B+ fuse (if used) is OK
E. Amplifier fuse is OK
F. B+ at battery and B+ at amplifier has proper voltage

2. Status LED’s Lit, No Output from Speakers in Normal Operating Condition
Verify:

A. RCA cables from amplifier to source are securely connected
B. Volume adjustment on amplifier is correctly adjusted
C. 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 leading
to ampli fier.
Verify:

A. RCA cables ar e o f good quality wit h no bre ak a ge to i nternal shiel ds
B. RCA cables from source to amplifier are not run alongside any power cables

4. Amplifier Output Distorted Music
Verify:

A. Source output music to amplifier is not distorted
B. Source output sensitivity is correctly adjusted

5. Amplifier Shuts Down, Green LED’s are Lit - Amplifier is in Thermal Protection Mode
Verify:

A. Amplifier is mounted with adequate air circulation around heatsinks or vents
B. Amplifier is not mounted under carpet or sealed enclosure
C. Speakers meet correct impedance for application (mono or stereo hookup)

6. Amplifier Does Not Turn ON, and Red LED is Lit Amplifier (and not Connected to a Shorted Speaker)
Verify:

A. Speaker crossover (if used) is no t defective

GTO5355

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RCA CAP (Red)
RCA CAP (Wht)

Trans. Clamp

Trans. Clamp

Trans. Clamp

Standoff

Front Plate

Standoff

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GTO5355