Alpine MRPF-240 Service manual

MRP-F240

SERVICE MANUAL

4/3/2 CHANNEL POWER AMPLIFIER

1/03-A
68E35050S01

TO ALPINE Home Page

<Cautions for Safe Repair Work>

r

s

The following cautions will prevent accidents in the workplace and will ensure safe products.
*The symbols indicate caution is needed to prevent injuries and damage to property.
The symbols and their meanings follow.

Warning

Caution

*The following symbols indicate two levels of cautions.

When you see this symbol, you have to be very careful.

When you see this symbol, you have to follow the instructions there.

If you ignore this symbol and handle the product incorrectly or unsafely,
serious injury or death may result.

If you ignore this symbol and handle the product incorrectly or unsafely,
injury or only material damage may result.

Warning

Do not look squarely into the laser light
coming from the pickup. Always use a designated fuse.

You may loose you sight. Use of an incorrect fuse may result in a fire.

Caution

Do not allow wiring to be caught in the Battery Caution
screw/chassis. Use the designated battery.

If wiring is caught in the screw/chassis, it may Confirm the correct polarity and seat of the
cause a short circuit, resulting in a fire. battery.

Fuse Caution

An incorrect battery or an improperly connected
or seated battery may result in a fire.

High Temperature Caution Designated Parts Caution

Touching the heat sink may cause severe burns. Look up the part list and ensure that only

designated parts are used to prevent problems or
accidents.

Reverse Power Supply Connections o
Misconnections Caution Ensure that the wiring is correct when rewiring to

Reverse power supply connections or prevent problems with ignition/breakdown.
misconnections may cause ignition problems and
smoke may result.

Soldering Caution Wear Glove

Hot solder from solder splash may cause severe Wear gloves to prevent electrical shocks or injury
burns. from the end face of the metal.

Wiring Caution

Contents

Packing Assembly Parts List
Packing Method View
Specifications
Block Diagram
Parts Layout on P.W.Boards and Wiring Diagram
Schematic Diagram
Terminal Voltage of IC/TR
Exploded View (Cabinet)

NOTE : Due to continuing product improvement, specifications and designs are subject to
change without notice.

R

104

103

106

101

102

105

X4

X2

X2

107

Symbol

No.

Part No.

Description

101
102
103
104
105

106
107

68P02294K68
03E34961S01
03E34955S01
15E34956S01
75E22439S01

75E22440S01
01E23875S01

OWNER'S MANUAL
SCR M4X20 TPG1,BLK
SCR M3X10(B)MCH(BLK)
COVER,RCA
HOUSING RUBBER-B

HOUSING,RUBBER(C)
ASS'Y INPUT WIRE

Packing Method View

Symbol

No.

Part No.

Description

Packing Assembly Parts List

TO CONTENTS

Specifications

T.H.D. (DC14.4V, 20Hz~20kHz) ....................................................................... 4ohm-Load/4ch, 35W Output : 0.2%

4ohm-Load/2ch (BTL), 95W Output : 1.0%

Power Output (Normal Input, DC14.4V, 20Hz~20kHz) ..................................... 0.2% T.H.D., 4ohm-Load/4ch : 35W

1.0% T.H.D., 4ohm-Load/2ch (BTL) : 90W

S/N Ratio (Ref. Output 35W/4ohm, Input Shorted) ............................................................................................ 94dB

Input Sensitivity (35W Output) .................................................................... GAIN-VR Center : RCA Input : 1.1V±5dB

SP Input : 2.2V±5dB

GAIN-VR CW : RCA Input : 0.2V±5dB

SP Input : 0.4V±5dB

GAIN-VR CCW : RCA Input : 4.5V±5dB

SP Input : 8.9V±5dB

Frequency Response Ratio (Ref. 1kHz, 0±1dB) ..................................................................................... 20Hz~40kHz

Current Drain ..................................................................................................................................... No Signal : 1.5A

4ohm-Load/4ch, T.H.D. 10% : 30A

Residual Noise (Input Shorted, 4ohm-Load/4ch, VR Center) ........................................................................... 3.0mV

Channel Separation (Input Shorted, 1kHz, 35W Output) .................................................................................... 55dB

Remote on Voltage (1W Output) .......................................................................................................... 6.5+1.0, -1.5V

Remote Current Drain ....................................................................................................................................... 3.0mA

Back-up Current Drain ...................................................................................................................................... 1.2mA

Input Impedance

............................................................................................................... RCA Input : 13.8±2.0kohm

SP Input : 13.8±2.0kohm

Power Source ........................................................................................................................... DC14.4V (9.0~16.0V)

Dimensions (W x H x D)

........................................................................................................... 265.6 x 60 x 241.4mm

Weight ............................................................................................................................................................... 2.54kg

NOTE : Due to Continuing product improvement, specifications and designs are subject to change without notice.

TO CONTENTS

Block Diagram

TO CONTENTS

HPF(12dB/OCT)

RCA-IN CH-1(+)

CH-1(L) CH-1(-)

ISOLATOR GAIN

SP-IN

CH-1 50K-A
CH-2

RCA-IN CH-2(-)

CH-2(R) CH-2(+)

PRE-OUT

CH-1+3(L) 50K-A

ISOLATOR GAIN

BUFFER

80Hz-FIX

LPF(12dB/OCT)

80Hz-FIX

HPF(12dB/OCT)

80Hz-FIX

LPF(12dB/OCT)

80Hz-FIX

PRE-OUT

CH-2+4(R)

RCA-IN CH-3(+)

CH-3(L) CH-3(-)

BUFFER

ISOLATOR GAIN

BASS EQ

LPF(12dB/OCT)

80Hz-FIX

HPF(12dB/OCT)

80Hz-FIX

SEL
S/W

MUTE ON/OFF

SEL
S/W

MUTE ON/OFF

SEL
S/W

DC off set

Over Current Protect

Pre

drive

DC off set

Over Current Protect

Pre

drive

DC off set

Over Current Protect

Pre

drive

SENSOR
SENSOR

POWER AMP

SENSOR
SENSOR

POWER AMP

SENSOR
SENSOR

POWER AMP

SEL
S/W

Thermal

Power trans

MUTE ON/OFF

MUTE ON/OFF

DC off set

Over Current Protect

Pre

drive

RECTIFIER

AND

REGULATER

SENSOR
SENSOR

POWER AMP

±Vcc

±15V

GND

SIG

±15V

REGULATOR

SP-IN

CH-3 50K-A 5K-E
CH-4

RCA-IN CH-4(-)

CH-4(R) CH-4(+)

BATT

REM

GND

ISOLATOR GAIN

MUTE ON/OFF

DRIVER

LINE CHOKE

BASS EQ

50K-A 5K-E

POWER
ON/OFF

LED

LPF(12dB/OCT)

80Hz-FIX

PWM IC

HPF(12dB/OCT)

80Hz-FIX

Over Temperature Protect (Trans)

POWER

FET