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2015J33-1

© 

2015.10

CEA2006 Standard
Power Output: 45 Watts RMS × 4 at 
4 Ohms < 1% THD+N
SN Ratio: 83 dBA 
(reference: 1 Watt into 4 Ohms)

Circuit system

OTL (output transformerless) circuit, 
Pulse power supply 

Inputs

RCA pin jacks, 
High level input connector 

Input level

1 V (RCA pin jacks), 
8 V (High level input) 

Outputs

Speaker terminals 

Speaker impedance

4 Ȑ – 8 Ȑ

Maximum output

4 Speakers: 100 W × 4 (at 4 Ȑ) 

Rated output 

(supply voltage at 14.4 V, 1 kHz, 1% THD)
4 Speakers: 45 W × 4 (at 4 Ȑ) 

Frequency response

20 Hz – 20 kHz (

 dB) 

Harmonic distortion

0.08% or less (at 1 kHz, 4 Ȑ) 

Low-pass filter

120 Hz, 12 dB/oct 

High-pass filter

120 Hz, 12 dB/oct 

Power requirements

12 V DC car battery (negative ground (earth)) 

Power supply voltage

10.5 V – 16 V

Current drain

At rated output: 15 A (4 Ȑ, 45 W × 4) 
Remote input: 1 mA 

Dimensions

Approx. 162.8 mm × 37.3 mm × 62.6 mm 
(6 

1

/

2

 in × 1 

1

/

2

 in × 2 

1

/

2

 in) (w/h/d) not incl. 

projecting parts and controls 

 37.3 mm (1 

1

/

2

 in)

 62 .6 mm (2 

1

/

2

 in)

 31.3 m m (1 

1

/

4

 in)

 162.8 mm (6 

1

/

2

 in)

 176.8 mm (7 in)

Mass

Approx. 0.46 kg (1 

1

/

64

 lb) not incl. accessories 

Package contents:

Main unit (1)
Parts for installation and connections (1 set)

Design and specifications are subject to change 
without notice.

+0.5
−3.0

NOTES  ON  CHIP  COMPONENT  REPLACEMENT
• 

Never reuse a disconnected chip component.

• 

Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

UNLEADED  SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution:  Some printed circuit boards may not come printed with 

the lead free mark due to their particular size)

Unleaded solder has the following characteristics.
•  Unleaded solder melts at a temperature about 40 °C higher 

than ordinary solder.

 

Ordinary soldering irons can be used but the iron tip has to be 
applied to the solder joint for a slightly longer time.

 

Soldering irons using a temperature regulator should be set to 
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if 

the heated tip is applied for too long, so be careful!

• Strong 

viscosity

 

Unleaded solder is more viscous (sticky, less prone to fl ow) 
than ordinary solder so use caution not to let solder bridges 
occur such as on IC pins, etc.

• 

Usable with ordinary solder

 

It is best to use only unleaded solder but unleaded solder may 
also be added to ordinary solder.

CONFIRMING  THE  OPERATION
Please confi rm the car audio unit works even if REM output is not 
connected when you connect this unit with the car audio unit by 
the HIGH LEVEL input.

Thermal Protect
TH503 TEMP_POW2
1.  Short across TH503 with the power on in normal room envi-

ronment.

2.  Verify that the protector is operated and POWER/PROTECT 

indicator fl ashes quickly (once every 0.2 seconds). When input 
the signal and verify that there is no output on the SP-OUT.

 

However in normal operation this condition will occur if tem-
perature of TH503 is about 120 ± 5 °C.

3.  Verify that the protector is released and there is an output on 

the SP-OUT when the short was removed and reset the AMP 
REM.

TH502 TEMP and TH501 TEMP_AMP
1.  Input signal then short across TH501 with the power on in nor-

mal room environment.

2.  Verify that the protector is operated and the POWER/PRO-

TECT indicator fl ashes slowly (once every second) then verify 
that output signal on the SP-OUT reduce.

 

However in normal operation this condition will occur if tem-
perature of TH501 is about 101 ± 4 °C and temperature of 
TH501 and TH502 difference more than 45 ± 2 °C.

3.  Verify that the protector is released and output signal on the 

SP-OUT is increate when the short was removed.

Remark:
IC301 there are Over Current Protection, Offset Protection and 
Thermal Protection function.
So it also can protect these ones by itself.

DESTINATION  ABBREVIATIONS
The following abbreviations for model destinations are used in this 
service manual.

• Abbreviations
  U 

: US, Canadian, AEP, UK, E, Australian models

  IND 

: Indian model

NOTE  FOR  REPAIRING  BOARD
Only part of electrical parts that mounted on the board of this unit 
can be replaced for repair.
Refer to “6. ELECTRICAL PARTS LIST” about electrical parts 
for service.
Since electrical parts that are not described in the electrical parts 
list cannot be replaced for repair, replace the complete mounted 
board when these electrical parts are defective.

GREASE  APPLYING  OF REPLACING  THE  COMPLETE  
MAIN  BOARD  OR  IC301  ON  THE  MAIN  BOARD
When the complete MAIN board or IC301 on the MAIN board are 
replaced, be sure to apply the grease (OIL COMPOUND (KS609)) 
so as to cover the IC301 on the MAIN board.

This section is extracted 
from instruction manual.

ˋ The unit will not come into contact with a 

driver/passengers or materials in your car since 
the unit becomes hot during use.

ˎ Do not install the unit under the floor carpet, 

where the heat dissipation from the unit will be 
considerably impaired. 

Prepare a mounting board that is thicker than 20 
mm (

13

/

16

 in) since the supplied mounting screws 

ͬ are all 20 mm (

13

/

16

 in) long. The unit can also be 

mounted on the flat surface of your car without a 
mounting board.

1

Insert the supplied mounting brackets 

ͪ 

into the slits of the unit and secure them 
with the supplied bracket screws 

ͫ.

2

Place the unit on the mounting board 
and mark the two screw hole positions.

3

Drill a 3 mm (

1

/

8

 in) pilot hole at each 

mark on the mounting board.

ʘ

ʗ

ʘ

ʗ

Installation

ˎ Mount the unit on a flat surface.

ˎ Mount the unit where

ˋ The unit will not interfere with the normal 

movements of the driver.

ˋ The unit will not be exposed to direct sunlight 

or hot air from the heater.

ˎ Connect the +12 V power supply wire only after all 

the other wires have been connected and the 
settings on this unit have been made.

ˎ Be sure to connect the ground (earth) wire of the 

unit securely to a metal point of the car. A loose 
connection may cause a malfunction of the 
amplifier. 

ˎ Be sure to connect the remote control wire of the 

car audio unit to the remote input (REM) wire of 
the supplied power connection cable.

ˎ When using a car audio unit without a remote 

output for the amplifier, connect the remote input 
(REM) wire of the supplied power connection 
cable to the accessory power supply.

ˎ Use a power supply wire with a fuse (15 A) 

attached. 

ˎ All power wires connected to the positive battery 

post should be fused within 450 mm (17 

3

/

4

 in) of 

the battery post, and before they pass through 
any metal.

ˎ Make sure that the car’s battery wires connected 

to the car (ground (earth) to chassis) are of a wire 
gauge at least equal to that of the main power 
wire connected from the battery to the amplifier. 

ˎ During full-power operation, a current of more 

than 15 A will run through the system. Therefore, 
make sure that the wires to be connected to the 
+12 V and GND wires of this unit are at least 14-
Gauge (AWG-14) or have a sectional area of more 
than 2 mm² (

3

/

32

 in²).

Power Connections

4

Place the unit on the mounting board 
and secure it with the supplied mounting 
screws 

ͬ.

Connections

ˎ Before making any connections, disconnect the 

ground (earth) terminal of the car battery to avoid 
short circuits.

ˎ If your car is equipped with a computer system for 

navigation or some other purpose, disconnecting 
the ground (earth) wire from the car battery may 
damage the computer memory. Leaving the 
ground (earth) wire connected and disconnecting 
the +12 V power supply wire until all the other 
wires have been connected may prevent short 
circuits.

ˎ Be sure to use speakers with an adequate power 

rating. If you use small capacity speakers, they 
may be damaged.

ˎ Do not connect the ¾ terminal of the speaker 

system to the car chassis, and do not connect the 

¾ terminal of the right speaker with that of the 
left speaker.

ˎ Install the input and output cords away from the 

power supply wire. Running them close together 
may generate interference noise.

ʙ

ʙ

Set the INPUT SELECT switch to “2CH” or “4CH” 
according to the input connection.
Also, refer to the manual supplied with your car 
audio unit for further details.

Ƀ Line input connection

Set the INPUT SELECT switch to “4CH” with the 
speaker connection 

˫ (page 9).

Ʉ Line input connection

Set the INPUT SELECT switch to “2CH” with the 
speaker connection 

ˬ (page 9).

Input Connections

ʕ

Car audio

ʕ

Car audio

Connect the supplied power connection cable to 
the POWER/OUTPUT connector on the unit.

*1 Ground (earth) to chassis.
*2 If you have the factory original or some other car 

audio unit without a remote output for the amplifier, 
connect the remote input (REM) wire of the supplied 
power connection cable to the accessory power 
supply. With the high level input connection, the car 
audio unit can also be activated without need for a 
REMOTE connection. However, this function is not 
guaranteed for all car audio units.

ʔ

to a metal point of the car

less than 450 mm (17 

3

/

4

 in)

Fuse (15 A)

+12 V car battery

Car audio

Ʌ High level input connection

Set the INPUT SELECT switch to “4CH” with the 
speaker connection 

˫ (page 9).

ʖ

Gray

Gray/Striped

Front right speaker output

White

White/Striped

Front left speaker output

Car audio

Purple

Purple/Striped

Rear right speaker output

Rear left speaker output

Green

Green/Striped

Ɇ High level input connection

Set the INPUT SELECT switch to “2CH” with the 
speaker connection 

ǵ (page 9).

ʖ

Gray

Gray/Striped

White

White/Striped

Front right speaker output

Front left speaker output

Car audio

Set the REAR LPF switch and FRONT HPF switch to 
“ON” or “OFF” according to the speaker system.
Also, refer to the manual supplied with your 
speakers for further details.

Ǵ 4-speaker system

Set with the input connection 

Ƀ (page 7) or Ʌ 

(page 8).

ǵ 2-way system

Set with the input connection 

Ʉ (page 7) or Ɇ 

(page 8).

Note
In this system, the volume of the subwoofer will be 
controlled by the car audio unit fader control.

Speaker Connections

ʔ

White

White/Striped

Gray

Gray/Striped

Green

Green/Striped

Purple

Purple/Striped

Front speakers (min. 4 Ω)

Rear speakers (min. 4 Ω)

ʔ

White

White/Striped

Gray

Gray/Striped

Green

Green/Striped

Purple

Purple/Striped

Full range speakers (min. 4 Ω)

Subwoofers (min. 4 Ω)

or C.

or D.