Onkyo HTP-420B, HTP-420S Service Manual

HTP-420

SERVICE MANUAL

SERVICE MANUAL

5.1-CH HOME THEATER SPEAKER PACKAGE

Black and Silver models

MODEL HTP-420(B)/(S)

Ref. No. 3808

042004

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

--­230-240V AC, 50Hz

---

---

BMDD
BMDC

--­BMPA

---

---

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

SMDD
SMDC
SMDT
SMPA
SMGT
SMPT

Front Speakers (L / R)

"SKF-420F"

Center Speaker

"SKC-420C"

Surround Speakers (L / R)

"SKM-420S"

Powered Subwoofer

"SKW-420"

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

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 :

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

77 W

Auto Standby function

Front Speaker (SKF-420F)

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 :
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 :

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

Specifications and appearance are subject to change

without prior notice.

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

HTP-420

EXPLODED VIEWS-1

SKW-420 : POWERED SUBWOOFER

HTP-420

A02

SP06

x 10 pcs.

A05 x 4 pcs.

A04

F903

A03

U02

U03

F902

A01

U01

A06

<Note>

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

Refer to "EXPLODED VIEWS-2"

MDD type
MDC type
MDT type

MPA type

MGT type
MPT type

<Notes>

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

--- No

--- No

--- No

--- Yes

--- Yes

--- Yes

HTP-420

EXPLODED VIEWS-2

SKW-420 : POWERED SUBWOOFER

HTP-420

SP06

x 8 pcs.

SP08

SP04

SP01

SP03

SP05

x 8 pcs.

SP02

x 4 pcs.

HTP-420

EXPLODED VIEWS-3

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

HTP-420

SP11 SP13

SP10 SP12

SP17 SP19

SP16

SP18

SP14

SP15

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

"SKC-420C"

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

TERMINAL :
White / Black

TERMINAL :
Red / Black

TERMINAL :
Green / Black

TERMINAL :
Blue / Black

TERMINAL :
Gray / Black

HTP-420

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

--- No

--- No

--- Yes

--- Yes

--- Yes

<Note>

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

--- Yes

--- Yes

--- Yes

--- No

--- No

--- 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

--- No

--- No

--- Yes

--- Yes

--- Yes

*

**

***

***

<Note>

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

--- Yes

--- Yes

--- Yes

--- No

--- No

--- No

HTP-420

PC BOARD CONNECTION DIAGRAM

SKW-420 : POWERED SUBWOOFER

HTP-420

MAIN PC BOARD

VR / LED PC BOARD

INPUT PC BOARD

<Notes>

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

--- No

--- No

--- No

--- Yes

--- Yes

--- Yes

POWER SWITCH

HTP-420

PRINTED CIRCUIT BOARD VIEW

SKW-420 : POWERED SUBWOOFER

A

1

2

3

4

5

BCD

INPUT PC BOARD

U02

MAIN PC BOARD

U01

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-

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.

January 2003

®

IN- 2

R2

680Ω

C2

22µF

C1 470nF

IN+

R1 22K

3

R3 22K

-

+

MUTE

STBY

4

VMUTE

VSTBY

10

9

SGND

MUTE

STBY

R4 22K

THERMAL

SHUTDOWN

S/C

PROTECTION

R5 10K

C3 10µF C4 10µF

1
STBY-GND

C5

22µF

713

14

6

158

-Vs -PWVs

BOOTSTRAP

OUT

+PWVs+Vs

C9 100nF C8 1000µF

-Vs

D97AU805A

+Vs

C7 100nF C6 1000µF

BUFFER DRIVER

11

BOOT
LOADER

12

5

VCLIP

CLIP DET

(*)

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

(**)

Figure 1: Typical Application and Test Circuit

Multiwatt15V Multiwatt15H

ORDERING NUMBERS:

TDA7293V TDA7293HS

MULTIPOWER BCD TECHNOLOGY

1/15

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

S

Supply Voltage (No Signal)

±

60 V

V

1

V

STAND-BY

GND Voltage Referred to -VS (pin 8) 90 V

V

2

Input Voltage (inverting) Referred to -VS 90 V

V

2

- V

3

Maximum Differential Inputs

±

30 V

V

3

Input Voltage (non inverting) Referred to -VS 90 V

V

4

Signal GND Voltage Referred to -VS 90 V

V

5

Clip Detector Voltage Referred to -VS 120 V

V

6

Bootstrap Voltage Referred to -VS 120 V

V

9

Stand-by Voltage Referred to -VS 120 V

V

10

Mute Voltage Referred to -VS 120 V

V

11

Buffer Voltage Referred to -VS 120 V

V

12

Bootstrap Loader Voltage Referred to -VS 100 V

I

O

Output Peak Current 10 A

P

tot

Power Dissipation T

case

= 70°C50W

T

op

Operating Ambient Temperature Range 0 to 70

°

C

T

stg

, TjStorage and Junction Temperature 150

°

C

1

2

3

4

5

6

7

9

10

11

8

BUFFER DRIVER
MUTE
STAND-BY

-V

S

(SIGNAL)

+V

S

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

TAB CONNECTED TO PIN 8

13

14

15

12

-VS (POWER)
OUT
+V

S

(POWER)
BOOTSTRAP LOADER

D97AU806

PIN CONNECTION (Top view)

THERMAL DATA

Symbol Description

Typ

Max Unit

R

th j-case

Thermal Resistance Junction-case 1 1.5

°

C/W

TDA7293

2/15

ELECTRICAL CHARACTERISTICS (Refer to the Test Circuit V

S

= ±40V, RL = 8Ω, Rg = 50 Ω;

T

amb

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

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

Supply Range

±

12

±

50 V

I

q

Quiescent Current 50 100 mA

I

b

Input Bias Current 0.3 1

µ

A

V

OS

Input Offset Voltage -10 10 mV

I

OS

Input Offset Current 0.2

µ

A

P

O

RMS Continuous Output Power d = 1%:

R

L

= 4

Ω;

VS = ± 29V,

75 80

80

W

d = 10%
R

L

= 4Ω ; VS = ±29V

90 100

100

W

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

P

O

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

0.005

0.1

%
%

I

SC

Current Limiter Threshold VS ≤ ± 40V 6.5 A

SR Slew Rate 5 10 V/µs

G

V

Open Loop Voltage Gain 80 dB

G

V

Closed Loop Voltage Gain (1) 29 30 31 dB

e

N

Total Input Noise A = curve

f = 20Hz to 20kHz

1
310

µ

V

µ

V

R

i

Input Resistance 100 k

Ω

SVR Supply Voltage Rejection f = 100Hz; V

ripple

= 0.5Vrms 75 dB

T

S

Thermal Protection DEVICE MUTED 150

°

C

DEVICE SHUT DOWN 160

°

C

STAND-BY FUNCTION

(Ref: to pin 1)

V

ST on

Stand-by on Threshold 1.5 V

V

ST off

Stand-by off Threshold 3.5 V

ATT

st-by

Stand-by Attenuation 70 90 dB

I

q st-by

Quiescent Current @ Stand-by 0.5 1 mA

MUTE FUNCTION

(Ref: to pin 1)

V

Mon

Mute on Threshold 1.5 V

V

Moff

Mute off Threshold 3.5 V

ATT

mute

Mute AttenuatIon 60 80 dB

CLIP DETECTOR

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

THD = 10% ;
RL = 10KΩ to 5V

30 40 50 %

I

CLEAK

PO = 50W 3

µ

A

SLAVE FUNCTION pin 4

(Ref: to pin 8 -V

S

)

V

Slave

SlaveThreshold 1V

V

Master

Master Threshold 3 V

Note (1):

G

Vmin

≥

26dB

Note:

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

Note (**):

Tested with optimized Application Board (see fig. 2)

TDA7293

3/15

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

TDA7293

4/15