Onkyo HTP-420 Service Manual

SERVICE MANUAL

5.1-CH HOME THEATER SPEAKER PACKAGE

MODEL HTP-420(B)/(S)

Front Speakers (L / R)

"SKF-420F"

Center Speaker

"SKC-420C"

Surround Speakers (L / R)

"SKM-420S"

HTP-420

Ref. No. 3808

042004

Powered Subwoofer

"SKW-420"

BMDD BMDC

--BMPA

---

Black and Silver models

120V AC, 60Hz 120V AC, 60Hz

--230-240V AC, 50Hz

---

SMDD SMDC SMDT SMPA SMGT SMPT

120V AC, 60Hz 120V AC, 60Hz 120V AC, 60Hz 230-240V AC, 50Hz 220-230V AC, 50/60Hz 230-240V AC, 50Hz

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ON THE

SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE

CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.

REPLACE THESE COMPONENTS WITH ONKYO

PARTS WHOSE PART NUMBERS APPEAR AS SHOWN

IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE

MEASUREMENTS TO DETERMINE THAT EXPOSED

PARTS ARE ACCEPTABLY INSULATED FROM THE

SUPPLY CIRCUIT BEFORE RETURNING THE

APPLIANCE TO THE CUSTOMER.

SPECIFICATIONS

Powered Subwoofer (SKW-420) Center Speaker (SKC-420C)

HTP-420

Type :

Input sensitivity/impedance : Maximum output power : Frequency response : Cabinet capacity : Dimensions (W x H x D) :

Weight : Driver unit : Power supply : America : Others :

Power consumption : America : Australia : Others : Other :

Front Speaker (SKF-420F)

Bass-reflex with built-in

power amplifier

220 mV / 15 k ohm

150 W (Dynamic Power)

30 Hz - 150 Hz

1.15 cubic feet (32.5 L)

9-1/4" x 20-3/8" x 16-3/16"

(235 x 518 x 411 mm)

28.2 lbs. (12.8 kg)

8 inch Cone Woofer

AC 120 V, 60 Hz

AC 230-240 V, 50 Hz

AC 220-230 V, 50/60 Hz

75 W

77 W

Auto Standby function

Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) :

Weight : Drivers unit :

Terminal : Other :

2 Way Bass-reflex

8 ohm

100 W

84 dB/W/m

60 Hz - 50 kHz

5 kHz

0.2 cubic feet (5.6 L)

17-1/8" x 5-1/8" x 7-1/16"

(435 x 130 x 179 mm)

7.5 lbs. (3.4 kg)

4 inch Cone Woofer x 2

1 inch Balanced Dome tweeter

Color-coded push type

Magnetic shielding

Surround Speaker (SKM-420S)

Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) :

Weight : Drivers unit :

Terminal : Other :

2-way Bass-reflex

8 ohm

100 W

84 dB/W/m

60 Hz - 50 kHz

5 kHz

0.2 cubic feet (5.6L)

4-7/8" x 18-5/16" x 7-1/16"

(124 x 465 x 179 mm)

7.5 lbs. (3.4 kg)

4 inch Cone Woofer x 2

1 inch Balanced Dome tweeter

Color-coded push type

Magnetic shielding

Type : Impedance : Maximum input power : Output sound pressure level : Frequency response : Crossover frequency : Cabinet capacity : Dimensions (W x H x D) :

Weight : Drivers unit :

Terminal :

Specifications and appearance are subject to change

without prior notice.

2-way Bass-reflex

8 ohm

100 W

82 dB/W/m

60 Hz - 50 kHz

5 kHz

0.08 cubic feet (2.3 L)

5-13/16" x 11" x 4-7/8"

(147 x 280 x 124 mm)

3.7 lbs. (1.7 kg)

4 inch Cone Woofer

1 inch Balanced Dome tweeter

Color-coded push type

EXPLODED VIEWS-1

SKW-420 : POWERED SUBWOOFER

A02

MDD type MDC type MDT type

MPA type

A06

SP06

x 10 pcs.

A01

<Notes>

A06 (POWER SWITCH) : MDD type MDC type MDT type MPA type MGT type MPT type

--- No

--- Yes

HTP-420

Refer to "EXPLODED VIEWS-2"

MGT type MPT type

A03

U03

U02

U01

A05 x 4 pcs.

A04

F903

F902

<Note>

IC501---> Refer to "PRINTED CIRCUIT BOARD PARTS LIST"

HTP-420

EXPLODED VIEWS-2

SKW-420 : POWERED SUBWOOFER

HTP-420

SP01

SP08

SP06

x 8 pcs.

SP04

SP02

x 4 pcs.

SP03

HTP-420

SP05

x 8 pcs.

EXPLODED VIEWS-3

SKF-420F / SKC-420C / SKM-420S

SP10 SP12

SP11 SP13

HTP-420

SP14

SP15

TERMINAL : Green / Black

TERMINAL : White / Black

TERMINAL : Red / Black

"SKF-420F (L)" "SKF-420F (R)"

SP16

SP17 SP19

TERMINAL : Blue / Black

TERMINAL : Gray / Black

"SKC-420C"

SP18

HTP-420

"SKM-420S (R)""SKM-420S (L)"

BLOCK DIAGRAM

SKW-420 : POWERED SUBWOOFER

HTP-420

SCHEMATIC DIAGRAM

SKW-420 : POWERED SUBWOOFER

HTP-420

A

1

2

3

4

5

BCDEFGH

LINE INPUT

OUTPUT LEVEL

AC 120V / 60Hz AC 220-230V / 50Hz AC 230-240V / 50Hz

INPUT PC BOARD

U02

MAIN PC BOARD

U01

VR / LED PC BOARD

U03

LED RED : STANDBY GREEN : ON

<Note>

POWER SWITCH* / C1** MDD type MDC type MDT type MPA type MGT type MPT type

--- No

--- Yes

<Note>

C913*** / C914*** MDD type MDC type MDT type MPA type MGT type MPT type

--- Yes

--- No

HTP-420

SPEAKER

MAIN PC BOARD

*

**

***

HTP-420

SCHEMATIC DIAGRAM

SKW-420 : POWERED SUBWOOFER

A

1

2

3

4

5

BCDEFGH

LINE INPUT

OUTPUT LEVEL

AC 120V / 60Hz AC 220-230V / 50Hz AC 230-240V / 50Hz

SPEAKER

INPUT PC BOARD

U02

MAIN PC BOARD

U01

VR / LED PC BOARD

U03

LED RED : STANDBY GREEN : ON

<Note>

POWER SWITCH* / C1** MDD type MDC type MDT type MPA type MGT type MPT type

--- No

--- Yes

*

**

***

<Note>

C913*** / C914*** MDD type MDC type MDT type MPA type MGT type MPT type

--- Yes

--- No

PC BOARD CONNECTION DIAGRAM

SKW-420 : POWERED SUBWOOFER

INPUT PC BOARD

HTP-420

MAIN PC BOARD

VR / LED PC BOARD

POWER SWITCH

<Notes>

POWER SWITCH : MDD type MDC type MDT type MPA type MGT type MPT type

--- No

--- Yes

HTP-420

A

PRINTED CIRCUIT BOARD VIEW

SKW-420 : POWERED SUBWOOFER

MAIN PC BOARD

U01

1

2

BCD

3

4

INPUT PC BOARD

U02

5

VR / LED PC BOARD

U03

No PC board view Look over the actual PC board on hand

®

TDA7293

120V - 100W DMOS AUDIO AMPLIFIER WITH MUTE/ST-BY

VERY HIG H OPERATI NG VOLTAGE R ANGE (±50V)

DMOS POWER STAGE HIGH OUTPUT POWER (100W @ THD =

10%, R

L

= 8Ω, VS = ±40V) MUTING/STAND- BY FUNC TION S NO SWITCH ON/OFF NOISE VERY LOW DISTORTION VERY LOW NOISE SHORT CIRCUIT PROTECTED (WITH NO IN-

PUT SIGNAL APPLIED) THERMAL SHUTDOWN CLIP DETECTOR MODULARITY (MORE DEVICES CAN BE

EASILY CONNECTED IN PARALLEL TO DRIVE VERY LOW IMPEDANCES)

DESCRIPTION

The TDA7293 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications (Home Stereo, self powered loudspeakers, Top-

Figure 1: Typical Application and Test Circuit

MULTIPOWER BCD TECHNOLOGY

Multiwatt15V Multiwatt15H

ORDERING NUMBERS:

TDA7293V TDA7293HS

class TV). Thanks to the wide voltage range and to the high out current c apability it is able to supply the highest power into both 4Ω and 8Ω loads.

The built in muting function with turn on delay simplifies the remote operation avoiding switching on-off noises. Parallel mode is made possible by connecting more device through of pin11. High out put power can be delivered to very low impedance loads, so optimizing the thermal dissipation of the system.

VMUTE

VSTBY

January 2003

R3 22K

C2

R2

22µF

680Ω

C1 470nF

R1 22K

R5 10K

R4 22K

C3 10µF C4 10µF

IN- 2

IN+

3

4

SGND (**)

10

MUTE

9

STBY

(*) see Application note (**) for SLAVE function

C7 100nF C6 1000µF

BUFFER DRIVER

11

713

-

+

MUTE

STBY

1 STBY-GND

THERMAL

SHUTDOWN

-Vs -PWVs

C9 100nF C8 1000µF

-Vs

+Vs

+PWVs+Vs

S/C

PROTECTION

158

14

12

6 5

D97AU805A

OUT

BOOT LOADER

C5

22µF

BOOTSTRAP

CLIP DET

(*)

VCLIP

1/15

TDA7293

PIN CONNECTION (Top view)

-VS (POWER) OUT +V

(POWER)

S

BOOTSTRAP LOADER BUFFER DRIVER MUTE STAND-BY

-V

(SIGNAL)

S

+V

(SIGNAL)

S

BOOTSTRAP CLIP AND SHORT CIRCUIT DETECTOR SIGNAL GROUND NON INVERTING INPUT INVERTING INPUT STAND-BY GND

TAB CONNECTED TO PIN 8

15 14 13 12 11 10

9 8 7 6 5 4 3 2 1

D97AU806

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

V

1

V

2

- V

V

2

V

3

V

4

V

5

V

6

V

9

V

10

V

11

V

12

I

O

P

tot

T

op

, T

T

stg

Supply Voltage (No Signal) V

STAND-BY

GND Voltage Referred to -VS (pin 8) 90 V Input Voltage (inverting) Referred to -VS 90 V Maximum Differential Inputs

3

Input Voltage (non inverting) Referred to -VS 90 V Signal GND Voltage Referred to -VS 90 V Clip Detector Voltage Referred to -VS 120 V Bootstrap Voltage Referred to -VS 120 V Stand-by Voltage Referred to -VS 120 V Mute Voltage Referred to -VS 120 V Buffer Voltage Referred to -VS 120 V Bootstrap Loader Voltage Referred to -VS 100 V Output Peak Current 10 A Power Dissipation T

= 70°C50W

case

Operating Ambient Temperature Range 0 to 70 Storage and Junction Temperature 150

j

60 V

±

30 V

±

C

°

C

°

THERMAL DATA

Symbol Description

Thermal Resistance Junction-case 1 1.5

2/15

R

th j-case

Typ

Max Unit

C/W

°

TDA7293

ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V

T

= 25°C, f = 1 kHz; unless otherwise specified).

amb

= ±40V, RL = 8Ω, Rg = 50 Ω;

S

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

I

OS

P

Supply Range

S

I

Quiescent Current 50 100 mA

q

Input Bias Current 0.3 1

I

b

Input Offset Voltage -10 10 mV

OS

Input Offset Current 0.2 RMS Continuous Output Power d = 1%:

O

R

= 4

VS = ± 29V,

Ω;

L

d = 10%

= 4Ω ; VS = ±29V

R

L

d Total Harmonic Distortion (**) PO = 5W; f = 1kHz

P

= 0.1 to 50W; f = 20Hz to 15kHz

O

I

Current Limiter Threshold VS ≤ ± 40V 6.5 A

SC

12

±

75 80

90 100

100

0.005

80

50 V

±

0.1

SR Slew Rate 5 10 V/µs

G G e

R

SVR Supply Voltage Rejection f = 100Hz; V

T

Open Loop Voltage Gain 80 dB

V

Closed Loop Voltage Gain (1) 29 30 31 dB

V

Total Input Noise A = curve

N

f = 20Hz to 20kHz

Input Resistance 100 k

i

= 0.5Vrms 75 dB

ripple

Thermal Protection DEVICE MUTED 150

S

1 310

DEVICE SHUT DOWN 160

STAND-BY FUNCTION

V V

ATT

I

q st-by

ST on ST off

Stand-by on Threshold 1.5 V Stand-by off Threshold 3.5 V Stand-by Attenuation 70 90 dB

st-by

Quiescent Current @ Stand-by 0.5 1 mA

MUTE FUNCTION

V V

ATT

Mute on Threshold 1.5 V

Mon

Mute off Threshold 3.5 V

Moff

Mute AttenuatIon 60 80 dB

mute

(Ref: to pin 1)

CLIP DETECTOR

Duty Duty Cycle ( pin 5) THD = 1% ; RL = 10KΩ to 5V 10 %

THD = 10% ;

30 40 50 %

RL = 10KΩ to 5V

I

CLEAK

SLAVE FUNCTION pin 4

V

Slave

V

Master

Note (1): Note:

Note (**):

SlaveThreshold 1V Master Threshold 3 V

Vmin

G

26dB

≥

Pin 11 only for modular connection. Max external load 1MΩ/10 pF, only for test purpose

Tested with optimized Application Board (see fig. 2)

(Ref: to pin 8 -V

PO = 50W 3

)

S

A

µ

A

µ

W

% %

V

µ

V

µ

Ω

C

°

C

°

A

µ

3/15

TDA7293

Figure 2: Typical Application P.C. Board and Component Layout (scale 1:1)

4/15