Onkyo SKSHT-320 Service Manual

SERVICE MANUAL

SERVICE MANUAL

5.1-CH HOME THEATER SPEAKER PACKAGE

MODEL SKS-HT320(S)

Powered Subwoofer

Front Speakers (L / R)

"SKF-320F"

Center Speaker

"SKC-320C"

Surround Speakers (L / R)

"SKM-320S"

SKS-HT320

Ref. No. 3846

092004

"SKW-320X"

Silver model

120 V AC, 60HzSMDD

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-320X) Center Speaker (SKC-320C)

SKS-HT320

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

Weight :
Speaker unit :
Power supply :
Power consumption :
Other :

Front Speaker (SKF-320F)

Powered Bass-reflex

220 mV / 15 k ohm

100 W (Dynamic Power)

35 Hz - 150 Hz

0.91 cubic feet (26 Litter)

9-1/16 x 17-13/16 x 15-7/8

inch

(230 x 436 x 404 mm)

24.7 lbs. (11.2 kg)

8 inch Cone

AC 120 V, 60 Hz

75 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 :
Speaker unit :
Woofer
Tweeter
Terminal :
Other :

2 Way Bass-reflex

8 ohm

100 W

78 dB/W/m

70 Hz - 50 kHz

4.5 kHz

0.057 cubic feet (1.6 Litter)

10-3/8 x 4 x 4-15/16 inch

(264 x 101 x 126 mm)

4.4 lbs. (2.0 kg)

3-1/8 inch Cone x 2

1 inch Balanced Dome

Spring type Color coded

Magnetic shielding

Surround Speaker (SKM-320S)

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

Weight :
Speaker unit :
Woofer :
Tweeter :
Terminal :
Other :

2 Way Bass-reflex

8 ohm

100 W

76 dB/W/m

70 Hz - 50 kHz

4.5 kHz

0.035 cubic feet (1.0 Litter)

4 x 6-5/8 x 4-15/16 inch

(101 x 169 x 126 mm)

2.6 lbs. (1.2 kg)

3-1/8 inch Cone

1 inch Balanced Dome

Spring type Color coded

Magnetic shielding

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

Weight :
Speaker unit :
Woofer :
Tweeter :
Terminal :

Specifications and appearance are subject to change

without prior notice.

2 Way Bass-reflex

8 ohm

100 W

79 dB/W/m

70 Hz - 30 kHz

10 kHz

0.035 cubic feet (1.0 Litter)

4 x 6-5/8 x 4-15/16 inch

(101 x 169 x 126 mm)

1.8 lbs. (0.8 kg)

3-1/8 inch Cone Woofer

3/4 inch Ceramic Tweeter

Spring type Color coded

EXPLODED VIEWS-1

SKS-HT320

SKW-320X : POWERED SUBWOOFER

A02

A03

U01

SP06

x 10 pcs.

A01

Refer to "EXPLODED VIEWS-2"

U03

U02

A05 x 4 pcs.

A04

F903

F902

<Note>

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

SKS-HT320

EXPLODED VIEWS-2

SKW-320X : POWERED SUBWOOFER

SKS-HT320

SP01

SP08

SP06

x 8 pcs.

SP02

x 4 pcs.

SP04

SP03

SKS-HT320

SP05

x 8 pcs.

EXPLODED VIEWS-3

SKF-320F / SKC-320C / SKM-320S

SKS-HT320

TERMINAL :
White / Black

SP11

SP10 SP12

TERMINAL :
Red / Black

"SKF-320F (L)" "SKF-320F (R)"

SP16 SP18

SP17 SP19

SP13

SP14

SP15

TERMINAL :
Green / Black

"SKC-320C"

TERMINAL :
Blue / Black

NOT MAGNETICALLY SHIELDED NOT MAGNETICALLY SHIELDED

TERMINAL :
Gray / Black

"SKM-320S (R)""SKM-320S (L)"

SKS-HT320

BLOCK DIAGRAM

SKW-320 : POWERED SUBWOOFER

HTP-320

HTP-320

SCHEMATIC DIAGRAM

SKW-320: POWERED SUBWOOFER

HT-320FGH

LINE
INPUT

INPUT PC BOARD

U02

OUTPUT
LEVEL

VR / LED PC BOARD

U03

HTP-320

SPEAKER

MAIN PC BOARD

HTP-320

A

SCHEMATIC DIAGRAM

SKW-320: POWERED SUBWOOFER

1

2

BCDEFGH

SPEAKER

3

LINE
INPUT

OUTPUT
LEVEL

4

INPUT PC BOARD

U02

VR / LED PC BOARD

U03

LED
RED : STANDBY
GREEN : ON

U01

AC 120V / 60Hz

MAIN PC BOARD

5

PC BOARD CONNECTION DIAGRAM

SKW-320 : POWERED SUBWOOFER

INPUT PC BOARD

HTP320

MAIN PC BOARD

VR / LED PC BOARD

HTP-320

HTP-320

A

PRINTED CIRCUIT BOARD VIEW

SKW-320POWERED 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
I

V

I

OS

P

Supply Range

S

Quiescent Current 50 100 mA

q

Input Bias Current 0.3 1

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

SC

Current Limiter Threshold VS ≤ ± 40V 6.5 A

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

Mon
Moff

Mute on Threshold 1.5 V
Mute off Threshold 3.5 V
Mute AttenuatIon 60 80 dB

mute

(Ref: to pin 1)

(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

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

TDA7293

APPLICATION SUGGES TION S (see Test and Application Circuits of the Fig. 1)

The recommended values of t he external components are t hose shown on t he application circuit o f Fig­ure 1. Different values can be used; the following table can help the designer.

COMPONENTS SUGGESTED VALUE PURPOSE

LARGER THAN

SUGGESTED

R1 (*) 22k INPUT RESISTANCE INCREASE INPUT

IMPEDANCE

R2 680

Ω

CLOSED LOOP GAIN

DECREASE OF GAIN INCREASE OF GAIN

SMALLER THAN

SUGGESTED

DECREASE INPUT

IMPEDANCE

SET TO 30dB (**)

R3 (*) 22k INCREASE OF GAIN DECREASE OF GAIN

R4 22k ST-BY TIME

CONSTANT

LARGER ST-BY

ON/OFF TIME

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

R5 10k MUTE TIME

CONSTANT

C1 0.47µF INPUT DC

DECOUPLING

LARGER MUTE

ON/OFF TIME

SMALLER MUTE

ON/OFF TIME
HIGHER LOW

FREQUENCY

CUTOFF

C2 22µF FEEDBACK DC

DECOUPLING

HIGHER LOW
FREQUENCY

CUTOFF

C3 10µF MUTE TIME

CONSTANT

C4 10µF ST-BY TIME

CONSTANT

LARGER MUTE

ON/OFF TIME

LARGER ST-BY

ON/OFF TIME

SMALLER MUTE

ON/OFF TIME

SMALLER ST-BY

ON/OFF TIME;

POP NOISE

C5 22µFXN (***) BOOTSTRAPPING SIGNAL

C6, C8 1000µF SUPPLY VOLTAGE

C7, C9 0.1µF SUPPLY VOLTAGE

(*) R1 = R3 for pop optimization
(**) Closed Loop Gain has to be ≥ 26dB
(***) Multiplay this value for the number of modular part connected

D98AU821

S

)

Slave function: pin 4 (Ref to pin 8 -V

+3V

-V

S

-V

+1V

S

-V

S

MASTER

UNDEFINED

SLAVE

DEGRADATION AT
LOW FREQUENCY

BYPASS

DANGER OF

BYPASS

OSCILLATION

Note:

If in the application, the speakers are connected
via long wires, it is a good rule to add between
the output and GND, a Boucherot Cell, in order to
avoid dangerous spurious oscillations when the
speakers terminal are shorted.

The suggested Boucherot Resistor is 3.9Ω/2W
and the capacitor is 1µF.

5/15