GTO-3EZ - JBL Car Audio Service Manual (repair manual)

gto-3ez service manual
Model
GTO-3EZ
Pages
40
Size
2.81 MB
Type
PDF
Document
Service Manual
Brand
Device
Car Audio
File
gto-3ez.pdf
Date

Read JBL GTO-3EZ Service Manual online

Service Manual
GTO-3EZ 
power amplifier 
-  CONTENTS  -   
SPECIFICATIONS ………………………………………..2 
CONNECTIONS……………………………………………3
BASIC TROUBLESHOOTING… ………………..……....8 
PACKAGING EXPLODED VIEW ……………..............10 
EXPLODED VIEW …..………....…….….….…………...11 
ELECTRICAL PARTS LIST……………………………..12 
PCB DRAWINGS…………….……….……….…….……26 
BLOCK DIAGRAM…………………………....….....……32 
SCHEMATIC………..….…….……………….…...….…..33
SPECIFICATIONS
GTO-3EZ
Number of Channels:
2 + 1
Power Output (CEA 2006A):
50W RMS x 2 channels at 4 ohms + 350W RMS x 1 channel at 4 ohms, 
14.4V DC, <1.0% THD
75W RMS x 2 channels at 2 ohms + 500W RMS x 1 channel at 2 ohms, 
14.4V DC, <1.0% THD
150W RMS x 1 channel bridged at 4 ohms + 500W RMS x 1 channel at  
2 ohms, 14.4V DC, <1.0% THD
Max Power:
1370W: 1050W x 1 channel at 2 ohms (50Hz) + 160W x 2 channels at  
2 ohms (1kHz), 15.5V DC, 10% THD
Frequency Response:
20Hz – 23kHz (±0.5dB) front and rear channels;  
10Hz – 280Hz (±3dB) sub channel
Crosstalk:
> 50dB @ 1kHz
Signal-to-Noise (@ 1W):
> 85dB
Maximum Current Draw:
65A
Fuse Replacement:
35A 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-3EZ
2
CONNECTING THE POWER AND GROUND
The GTO series 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 series 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 – 13.2mm
2
 – for the GTO-5EZ; minimum 8AWG – 8.4mm
2
 – for the GTO-3EZ) 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 (0.82mm
2
) Wire
> #6AWG (13.2mm
2
) Wire – GTO-5EZ
> #8AWG (8.4mm
2
) Wire – GTO-3EZ
+12V
18" 
(46cm)
> #6AWG (13.2mm
2
) Wire – GTO-5EZ
> #8AWG (8.4mm
2
) Wire – GTO-3EZ
90A Fuse (GTO-5EZ) 
70A Fuse (GTO-3EZ) 
Chassis Ground 
(bare metal)
GTO-3EZ
3
Power Connection
1.  Connect a wire (minimum 6AWG – 13.2mm
2
 – for the GTO-5EZ; minimum 8AWG – 8.4mm
2
 – for the GTO-3EZ) 
directly to the battery’s positive (+) terminal. 
2.  Install a fuse holder for a 90A fuse (GTO-5EZ) or 70A fuse (GTO-3EZ) 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-5EZ = 90A fuse; GTO-3EZ = 70A fuse.)
SPEAKER CONNECTIONS
Always connect the (+) terminal on the amplifier to the (+) terminal on the speaker and the (–) terminal on the amplifier 
to the (–) terminal on the speaker.
Speaker 
Connectors
GTO-5EZ
GTO-3EZ
Speaker 
Connectors
IMPORTANT: Make sure the (+) and (–) bare wires do not touch each other or the other terminal at both the amplifier 
terminals and speaker terminals. Touching wires can cause a short circuit that can damage the amplifier.
NOTE: The minimum speaker impedance for stereo operation is 2 ohms. The minimum speaker impedance for bridged 
operation is 4 ohms. The minimum subwoofer impedance is 2 ohms.
Stereo operation 
• Connect the front speakers to the Front L (FL) and Front R (FR) (+) and (–) terminals. 
• GTO-5EZ only: Connect the rear speakers, using the RL and RR (+) and (–) terminals. 
• Connect the subwoofer to the Sub (+) and (–) terminals.
Front Left Speaker
Rear Left Speaker*
Front Right Speaker
Rear Right Speaker*
*GTO 5EZ only
Subwoofer
GTO-3EZ
4
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Here you can read online and download JBL GTO-3EZ Service Manual in PDF. GTO-3EZ service manual will guide through the process and help you recover, restore, fix, disassemble and repair JBL GTO-3EZ Car Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.