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GTO Series
75.4
75.4II
4 CHANNEL POWER AMPLIFIER
SERVICE MANUAL
JBL Consumer Products
250 Crossways Park Dr.
Woodbury, New York 11797 Rev3vvv10/2005
Power Amplifier GTO 75.4/75.4II
- CONTENTS -
SPECIFICATIONS ................................................1
FEATURES/TEST CONDITIONS.............................2
INSTALLATION......................................................3
CONNECTIONS.....................................................4
SET-UP/CONTROLS .............................................5
INSTALLING NEON TUBES....................................5
BASIC TROUBLESHOOTING..................................7
TYPICAL SYSTEM WIRING....................................8
EXPLODED VIEW/PARTS LIST...............................9
MECHANICAL PARTS LIST....................................10
AMPLIFIER BLOCK DIAGRAM...............................11
P.C.B. DRAWINGS................................................12
ELECTRICAL PARTS LIST ....................................16
VERSION II ELECTRICAL PARTS LIST ADDENDUM..............19
IC/TRANSISTOR PINOUTS......................................20
GTO 75.4 SCHEMATICS........................................23
GTO 75.4II SCHEMATICS......................................26
PACKING............................................................29
GTO 75.4/75.4II Specifications
Output Power: 104W RMS x 4 channels @ 4 ohms; 1% THD + N
(14.4V supply) 142W RMS x 4 channels @ 2 ohms; 1% THD + N
284W RMS x 2 channels @ 4 ohms; 1% THD + N
Signal-to-noise ratio: 80dBA (reference 1W into 4 ohms)
Dynamic power: 163W @ 2 ohms
Effective damping factor: 6.38 @ 4 ohms
Frequency response: 10Hz 83kHz (3dB)
Maximum input signal: 5.8V
Maximum sensitivity: GTO 75.4 - 230mV
GTO 75.4II - 75mV
DC Offset <50Mv (-50%)
Output regulation: .069dB @ 4 ohms
Idle Current 1.3A
Input Impedance 22k
Max Current Draw 52A @ 4 ohms
83A @ 2 ohms
Dimensions: 15 1/8 x 12 5/16 x 2 3/8" (L x W x D)
(384mm x 313mm x 60mm)
Fuses: 30A x 2
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.
1
GTO 75.4/75.4II
2
GTO 75.4/75.4II
INSTALLATION
WARNING: Playing loud music in an · Before drilling or cutting holes, use a POWER CONNECTIONS Speaker Connections
automobile can hinder your ability to hear utility knife to remove unwanted fabric The GTO amplifiers are capable of Refer to the application guides on the
traffic and permanently damage your or vinyl to keep material from snagging delivering extremely high power levels, pages that follow. Speaker connections
hearing. We recommend listening at low or in a drill bit. and require a heavy-duty and reliable should be made using a minimum of
moderate levels while driving your car. JBL · When routing cables, keep input-signal connection to the vehicle's electrical system 16-gauge wire.
accepts no liability for hearing loss, bodily cables away from power cables and in order to perform optimally. See Figure 1
injury or property damage resulting from speaker wires. for connection location. Please adhere to High-Level Input Connections
the use or misuse of this product. · When making connections, make the following instructions carefully: The GTO75.4 and GTO75.4II
certain they are secure and properly amplifiers are equipped with speaker-level
IMPORTANT: To get the best insulated. Ground Connection inputs that allow you to add an amplifier
performance from your JBL Grand Touring® Connect the amplifier's Ground (GND) to head units that do not have RCA line
· If the amplifier's fuse must be replaced,
Series amplifiers, we strongly recommend terminal to a solid point on the vehicle's outputs. The speaker outputs for the
use only the same type and rating as
that installation be entrusted to a qualified metal chassis, as close to the amplifier source unit should be connected to the
that of the original. Do not substitute
professional. Although these instructions as possible. Refer to the chart below to amplifier using the supplied connector
another kind.
explain how to install GTO amplifiers in a determine minimum wire-gauge size. Scrape (square four-wire plug). Remember to
general sense, they do not show specific away any paint from this location; use a star- check for proper polarity. The GTO301.1,
installation methods that may be required CHOOSING A LOCATION type lock washer to secure the connection. GTO601.1 and GTO1201.1 amplifiers are
for your particular vehicle. If you do not AND MOUNTING THE not equipped with high-level inputs.
have the necessary tools or experience, AMPLIFIER Power Connection
do not attempt the installation yourself. Choose a mounting location in the trunk Connect a wire (see chart at right for NOTE: When using the high-level inputs,
Instead, please ask your authorized JBL or cargo area where the amplifier will not appropriate gauge) directly to the vehicle's the AUX outputs can be used to pass a
car audio dealer about professional be damaged by shifting cargo. Amplifier positive battery terminal, and install an line-level signal to another amplifier.
installation. cooling is essential for proper amplifier appropriate fuse holder within 18" of the
operation. If the amplifier is to be installed battery terminal. Do not install the fuse at Wire Gauge Chart
INSTALLATION in an enclosed space, make sure there is this time. Route the wire to the amplifier's Amplifier Maximum Minimum
WARNINGS AND TIPS sufficient air circulation for the amplifier location, and connect it to the amplifier's Model Current Draw Wire Gauge
· Always wear protective eyewear when to cool itself. Positive (+12V) terminal. Be sure to use GTO75.4 85A #8 AWG
using tools. appropriate grommets whenever routing G
· Turn off the audio system and other When mounting the amplifier under a wires through the firewall or other sheet AWG
electrical devices before you start. seat, ensure that it is clear of all moving metal. Failure to adequately protect the AWG
Disconnect the () negative lead from seat parts and does not affect the seat positive wire from potential damage may These recommendations assume 7' 10'
your vehicle's battery. adjustments. Mount the amplifier so it result in a vehicle fire. When you are done wire runs. If your installation differs mark-
is not damaged by the feet of backseat routing and connecting this wire, you may edly, you will need to adjust the wire
· Check clearances on both sides of
passengers. Make sure that the amplifier install the fuse at the battery. gauge accordingly.
a planned mounting surface before
is mounted securely using nuts and bolts
drilling any holes or installing any
or the supplied mounting screws. Remote Connection
screws. Remember that the screws
can extend behind the surface. Connect the amplifier's Remote (REM)
Mount the amplifier so that it remains terminal to the source unit's Remote Turn- IMPORTANT NOTE: If you are planning
· At the installation sites, locate and dry never mount an amplifier outside On lead using a minimum of 18-gauge wire. to use optional neon tubes, install them
make a note of all fuel lines, hydraulic the vehicle or in the engine compartment. before making any electrical connections
brake lines, vacuum lines and electrical
NOTE: When using the speaker level to the amplifier (refer to"Installing Neon
wiring. Use extreme caution when cut-
inputs, connect the remote (REM) terminal Tubes" on page 5).
ting or drilling in and around these areas.
to the source unit. If your source unit does
not have a remote turn-on connection,
connect the amplifier's (REM) terminal to
Figure 1. Terminal connection end plate. the vehicle's accessory circuit.
3
GTO 75.4/75.4II
CONNECTIONS GTO 75.4/75.4II
The GTO 75.4/75.4II can be set up for stereo
4-channel, 3-channel or bridged +
2-channel operation, as shown in +
Figures 6 through 8.
NOTE: For simplicity, Figures 6 through
8 do not show power, remote and input
connections.
NOTE: Minimum speaker impedance
for stereo operation is 2 ohms.
Minimum speaker impedance for
bridged operation is 4 ohms. +
+
Figure 6.GTO 75.4/75.4II amplifier in 4-channel (stereo) operation to drive front and rear full-range speakers.
+
+
+
Figure 7.GTO 75.4/75.4II is set up for 3-channel operation to drive a set of full-range speakers and a subwoofer.
+
+
Figure 8.GTO 75.4/75.4II used in bridged 2-channel mode to drive a set of components or subwoofers.
4
GTO 75.4/75.4II
INSTALLATION AND SETUP
SETTING THE SETTING INPUT INSTALLING NEON TUBES
CROSSOVER(S) SENSITIVITY (OPTIONAL)
Determine your system plans and set the 1. Initially turn the INPUT LEVEL control(s) 1. Using a Phillips screwdriver, remove all
crossover mode switch accordingly. If you to minimum (counter clockwise). screws on the amplifier's output/power
plan to use the GTO 75.4/75.4II to drive 2. Reconnect the () negative lead to the end panel and set them aside.
full-range speakers, set the crossover vehicle's battery. Apply power to the 2. Using a 3 /32-inch Allen wrench, remove
mode to FLAT and skip to "Setting Input audio system and play a dynamic music only the screws on the amplifier's (top)
Sensitivity." track. clear cover and set them aside.
3. On the source unit, increase the volume 3. Remove the end panel and slide the
Initially set the crossover frequency control to 3/4 volume. Slowly increase cover off. Set both parts aside.
control midway. While listening to music, the INPUT LEVEL control(s) toward three 4. Locate the enclosed hardware bag and
adjust the crossover for the least o'clock until you hear slight distortion remove the four clips. Each clip has a
perceived distortion from the speakers, in the music. Then reduce the INPUT square end and a larger round end.
allowing them to reproduce as much LEVEL slightly until distortion is no Using a round end, press two clips onto
bass as possible. longer heard. each neon tube (e.g., Street Glow AN9
or equivalent), as shown in Figure 13.
Systems using a separate subwoofer set NOTE: After the source unit is on, red LEDs 5. For each tube, align both clips so the
the crossover mode to HP (high pass) for (on the top panel) will light, indicating the square ends slide onto an exposed
your full-range speakers. Adjust the amplifier is on. If not, check the wiring, extrusion edge, as shown in Figure 9.
crossover frequency to limit bass and especially the remote connection from the Do not cover any screw holes. When
provide increased system volume with source unit. Also refer to "Troubleshooting" AUX OUTPUT installed correctly, each neon tube will
less distortion. on the next page. GTO 75.4/75.4II amplifiers are sit under an extrusion and not be visible
equipped with full-range outputs that can when viewed from directly above.
For subwoofers, choose the highest be used to connect additional amplifiers. 6. Route each neon tube's power cable
frequency that removes vocal information through its respective NEON hole on the
from the sound of the subwoofer. NOTE: When using the high-level inputs, end panel (see Figure 13).
the AUX outputs can be used to pass a 7. Slide the cover back into place and re-
If using the GTO 75.4/75.4II to drive a line-level signal to another amplifier. install its screws. Then, replace the end
subwoofer(s), set the crossover mode to panel and reinstall its screws.
LP (low pass). 8. Finish the installation of the neon tubes
as instructed in their owner's manual.
Figure 12.
5
GTO 75.4/75.4II
6
GTO 75.4/75.4II
INSTALLATION AND SETUP
To Neon
Power
Supply
To Neon
Power
Supply
Figure 13. Installing neon tubes in a JBL GTO amplifier.
TROUBLESHOOTING
SYMPTOM LIKELY CAUSE SOLUTION SYMPTOM LIKELY CAUSE SOLUTION
No audio No voltage at BATT+ Check voltages at No audio Voltage more than 16V Check vehicle
(POWER LED or REM terminals, amplifier terminals (PROTECT or less than 8.5V on charging system for
is off) or bad or no ground with VOM LED is on) BATT+ connection defective voltage
connection regulator
No audio DC voltage on Amplifier may need Distorted audio Input sensitivity is Check INPUT
(PROTECT LED amplifier output service; see enclosed not set properly, or LEVEL setting; or
flashes every warranty card for amplifier or source check speaker wires
4 seconds) service information unit is defective for shorts or grounds
No audio Amplifier is Make sure amplifier Distorted audio Short circuit in Remove speaker leads
(PROTECT overheated cooling is not blocked and PROTECT speaker or wire one at a time to locate
LED is on) at mounting location; LED flashes shorted speaker or
verify speaker system wire, then repair
impedance is within Music lacks Speakers are not Check speaker
specified limits (see "punch" connected properly connections for
"Specifications" on proper polarity
the next page)
No audio Voltage less than 9V on Check vehicle
(PROTECT BATT+ connection charging system for
and POWER defective voltage
LEDs flash) regulator
7
GTO 75.4/75.4II
Grand Touring
8
GTO 75.4/75.4II
GTO 75.4/75.4II Exploded View
A
B
C
D
E
1 2 3 4 5 6 7 8
9
GTO 75.4/75.4II
Mechanical Parts List
10
GTO 75.4/75.4II
GTO 75.4/75.4II BLOCK DIAGRAM
11
GTO 75.4/75.4II
12
GTO 75.4/75.4II
DST0013-00
J43 7.5m/m
J42
J29
W2 C34
ST-11A-2-8P
60m/m
WIRE
J30 TER01
7.5m/m
7.5m/m
TER02 WF-9604
7.5m/m 105(M)TL
FRONT FRONT 7.5m/m REM GND
IN4004
L/CH 7.5m/m
R/CH
D02
REAR FH01 J31 105(M)"TL" J322
10m/m
10m/m
10m/m
10m/m
J32 BJ06
J335
J334
J333
J332BJ01
J323
R262 REAR 35m/m
C01
J41
J40 7.5m/m
10m/m
10m/m
10m/m
10m/m
10m/m
10m/m
55m/m
55m/m
7.5m/m
6m/m
BJ02
680/2W 7.5m/m
680/2W 1N5404 7.5m/m
J33
D01
6m/m
7.5m/m
4.7/0.5W 104(M) 7.5m/m
R04
56K
R362 C03 104P
J300
4.7/0.5W
R261 C261 7.5m/m
R361
J39
J38
J37
J36
J35
J34
680/2W 7.5m/m
J01
12.5m/m
R462 1K J02 47
FQP50N06
R92 C3198GR R56
J336 BJ04 35m/m
4.7/0.5W Q02 J03 17.5m/mJ05
430K R63 J04
104(M) 8.2K 17.5m/mJ06
2
104(M)
R461 Q90 C3198GR
C461
R05
BJ0535m/m
C361 4.7K 2200/25"WL"
CL-310
A1266GR 22K
100/16V
R91 Q11 R11
C05 Q56
680/2W R90 47K 3.9K
47 R55
FQP50N06
R12 C11
10
12.5m/m
J310
R162 17.5m/mJ07
104(M)
R15 47/16V
10m/m
10m/m
104P 17.5m/mJ08
C14 C60
J337J22
C161
J53 6m/m
L03
4.7KF
20m/m
10K
R161 A1266GR R13 R62
2
Q12 10.5KF
J21
4.7/0.5W J52 6m/m R60 Q55
24K 2200/25V"WL" 47
R21 6m/m 1SS133 C04
FQP50N06
D03 R54