Onkyo HTP-120 Service Manual

SERVICE MANUAL

SERVICE MANUAL

HTP-120

SKW-120/D-120C/D-120

SPEAKER SYSTEM

HTP-120

Ref. No. 3722

052002

D-120 (Satellite)

SKW-120 (Subwoofer)

D-120C (Center)

Black model

120V AC, 60HzBMDD

SAFETY-RELATED COMPONENT
WARNING!!

THE MARK FOUND ON SOME COMPONENT
PARTS INDICATES THE CRITICAL FOR RISK OF
FIRE AND ELECTRIC SHOCK.
WHEN REPLACING, BE SURE TO USE PARTS OF
IDENTICAL DESIGNATION.
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.

P ANEL VIEW

SKW-120/HTP-120

Subwoofer SKW-120

Front

Rear

To AC outlet

A. LINE INPUT (input jack)

Connect this jack to the SUBWOOFER PREOUT jack of
the DR-S2.2.

B. Indicator

The indicator changes from red to green when the
subwoofer receives a signal.

C. OUTPUT LEVEL (Output level adjusting knob)

Use this knob to adjust the output level of the subwoofer.

ABC

LINE

INPUT

RED : STANDBY
GREEN : ON

OUTPUT LEVEL

Satellite speakers D-120

(Front left/right, Surround left/right)

85mm (3-3/8")

Key hole

120mm
(4-3/4")

Screw hole
for a
speaker
stand

The badge can be rotated depending on the angle you position the
speaker.

Center speaker D-120C

MAXMIN

130.5mm
(5-1/8")

The badge can be rotated depending on the angle you position the
speaker.

265mm (10-7/16")

The satellite speakers (D-120) and the center speaker (D-120C)
have colored labels on the backs for easy identification. Match
the color of the label with the corresponding speaker cable when
connecting the speakers. The DR-S2.2 SPEAKER terminals are
also colored to match the corresponding speaker cable.
Connect the cable with a colored line to the negative (
terminal.

The label colors and the corresponding speakers are as
follows:

Front left speaker and speaker cable: White
Front right speaker and speaker cable: Red
Center speaker and speaker cable: Green
Surround left speaker and speaker cable: Blue
Surround right speaker and speaker cable: Grey

180mm (7-1/16")

Key holes

-

)

SKW-120/HTP-120

A

SPECIFICATIONS

1

Subwoofer SKW-120

Type Bass-reflex with built-in power amplifier
Use For superbass-range reproduction
Frequency response 30-120 Hz (when used with the DR-S2.2)
Maximum output power 60 W
Dynamic output power 120 W
Input impedance 9.5 k ohm
Sensitivity Line 65 mV
Speaker 20-cm woofer
Power supply AC 120 V, 60 Hz

2

Power consumption 70 W (AC 120 V, 60 Hz)
Dimensions (W H D)

Weight 14.3 kg 31.5 lbs
Others

BCD

235 493 488 mm
9-1/4" 19-7/16" 19-3/16"

Auto standby on/off

Center speaker D-120C

Type 2 way bass reflex
Frequency response 100 Hz-25 kHz
Maximum input power 50 W
Output sound pressure level 85 dB/W/m
Impedance 6 ohm
Speaker 8-cm woofer 2

1.5-cm tweeter
Cabinet capacity 1.5 L
Dimensions (W H D) 265 130.5 79.5 mm

10-7/16" 5-1/8" 3-1/8"
Weight 1.3 kg 2.9 lbs.
Others Magnetic shielding

Satellite speaker D-120

Type 2 way bass reflex
Frequency response 100 Hz-25 kHz
Maximum input power 40 W
Output sound pressure level 82 dB/W/m
Impedance 6 ohm
Speaker 8-cm woofer

3

Cabinet capacity 0.8 L
Dimensions (W H D) 85 120 112 mm

Weight 0.7 kg 1.5 lbs.
Others

1.5-cm tweeter

3-3/8" 4-3/4" 4-7/16"
Magnetic shielding

Accessories

Audio connection cable (1 pc.)

3.5 m speaker cables (3 pcs.: white, red, green)
8 m speaker cables (2 pcs.: blue, grey)
Spacers for Subwoofer (4 pcs.)
Spacers for Satellite and Center speakers (black, 20 pcs.)
Horizontal mounting base (1 pc.)
Double-faced adhesive tapes (2 pcs.)
Cushioning pads (2 pcs.)
Instruction manual (this manual)

Specifications and appearance may subject to change for
improvement without prior notice.

4

5

SERVICE NOTE

1. Replacing the fuses

This symbol located near the fuses indicates that the fuse used is
fast operating type. For continued protection against fire hazard, re­place with same type fuse. For fuse rating refer to the marking adja­cent to the symbol.

Ce symbole indique que le fusible utlise est a rapide. Pour une pro­tection permanente, n'untiliser que fusibles de meme type. Ce darni­er est la qu le present symbol est appse.

CIRCUIT NO. PART NO. DESCRIPTION

F901 252159 or 2A-UL/T-237 or
252253 2A-T/UL-ST2

2. Safety-check out

After correcting the original service problem, perform the following
safety check before releasing the set to the customer. Connect the in­sulating-resistance tester between the plug of power supply cord and
screw on the back panel.
Specifications: 3.3M ohm+/-10% at 500V.

HTP-120

AC Leakage Test

Device

under

test

Test all
exposed metal
surfaces

Leakage
current
tester

Reading should
not be above

0.5mA

Earth
ground

HTP-120

A

BLOCK DIAGRAM

SUB WOOFER AMP.

1

NAETC-7457-1

U3

2

LED Red

LED Green

NAAF-7456-1

INPUT

BCD E

U2

P301

C301

AUTO_STANDBY

ON/OFF

CIRCUIT

OUTPUT

R303

LEVEL

+24dB

Q301

-2dB

LPF

-6DB/OCT
600HZ

MUTE

CIRCUIT

+28dB

POWER AMP

THERMAL

PROTECTION

CIRCUIT

SPEAKER

6 ohm

U1

NAAF-7455-1

+5.6V

3

4

1

+14.4V

1

-

14.4V

1

+B

1

GND

1

-

B

1

Q951

O

G

I

Q952

I

O

G

D933

C911

C912

C931

D911

D_ARRAY

D931

D932

T901

POWER TRANS

U4

F901

FUSE

NAPS-7458-1

AC IN

AC120VMDD

HTP-120

IDLING ADJUSTMENT

Adjustment of Idling current

1). Cancel the Auto standby ON mode.
P604 is short.

2). Connect the DC volt meter to P531.

3). At the no load and no input signal condition.

4). Turn on the power switch.
And adjust 0.25mV by trimmer (R544) on Main PC board.

5). After heat run for about 5 minutes, and set 4mV by R544 again.

Printed circuit board view from component side

C911

HTP-120

NCAF-7455

P604

D911

Q623

P623

Q951

Q952

Q516

Setting position of shipping

Output level ---------------------- MIN

C912

Q541

Trimmer

R544

Q514 Q513

P531

Q515

DC Volt meter

HTP-120

EXPLODED VIEW PARTS LIST

Amp section

REF. NO. PART NO. DESCRIPTION

U1 1W232555-1A NAAF-7455-1A, Main circuit PC board assy
U2 1W232556-1A NAAF-7456-1A, Output level control PC board assy
U3 1W232557-1A NAETC-7457-1A, LED PC board assy
U4 1W232558-1A NAPS-7458-1A, Power transformer PC board assy
A1 27160467 Heat sink, SKW-205AMP
A2 801433 3SMS8W.SW+14B(BC),

A3 27130745 Bracket (2)
A4 838130088 3TTB+8B, Self tapping screw (7)
A6 27141661 Retainer
A8 28184777 Cover
A9 28141322A Cushion
A10 28141475 Cushion t2X5X160 (2)
A11 28141476 Cushion t2X5X80 (2)
A41 27122963 Rear panel (Amp. Section)
A42 838430088 3TTB+8B(BC), Self tapping screw (13)
A43 830440109 4TTC+10C(BC), Self tapping screw (4)
A44 28141473 Cushion, t2X5X415 (2)
A45 28141474 Cushion, t2X5X195 (2)
A46 28141334 Cushion
A47 27301941 Cord bushing, KF-41
A48 28325405 Knob, OUTPUT LEVEL
E901 260208 Wire tie
Q515 * 2202524 2SC4468-Y or

* 2202523 2SC4468-O or
* 2202526 2SC4468-P or
* 2203062 2SC5198-R or
* 2203063 2SC5198-O, Transistor

Q516 * 2202514 2SA1695-Y or

* 2202513 2SA1695-O or
* 2202516 2SA1695-P or
* 2203052 2SA1941-R or
* 2203053 2SA1941-O, Transistor

Q515A, 223021 TBM-51W 9043, Isolation sheetQ516A

Q541 2202104 2SC3423-Y or

2202103 2SC3423-O
Q951 2202754 2SD1266-P
Q952 2202764 2SB941-P, Transistor
R602 4000144 PTH9M04-2.2K, Thermistor
T901 2301487 NPT-1396D, Power transformer
F901 252159 2A-UL/T-237 or

252253 2A-T/UL-ST2, Fuse
P901 253272HIT Power cord, AS-UC-6#18
A50 28141503 Cushion

NOTE: THE COMPONENTS IDENTIFIED BY MARK
ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH
PART NUMBER SPECIFIED.

Self tapping screw (6)

CAUTION: Replacement of the transistor of mark , if necessary,
must be made from the same beta group (HFE) as the
original type.

*