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HTP-120
Ref. No. 3722
052002
SERVICE MANUAL
HTP-120
SKW-120/D-120C/D-120
SPEAKER SYSTEM
D-120 (Satellite)
D-120C (Center)
SKW-120 (Subwoofer)
Black model
BMDD 120V AC, 60Hz
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.
SKW-120/HTP-120
PANEL VIEW
Subwoofer SKW-120 Satellite speakers D-120
(Front left/right, Surround left/right)
Front
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.
Rear
A B C Center speaker D-120C
LINE OUTPUT LEVEL
INPUT
265mm (10-7/16") 180mm (7-1/16")
RED : STANDBY
GREEN : ON
MIN MAX
130.5mm
(5-1/8")
Key holes
The badge can be rotated depending on the angle you position the
speaker.
To AC outlet 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
A. LINE INPUT (input jack) connecting the speakers. The DR-S2.2 SPEAKER terminals are
Connect this jack to the SUBWOOFER PREOUT jack of also colored to match the corresponding speaker cable.
the DR-S2.2. Connect the cable with a colored line to the negative (-)
terminal.
B. Indicator
The indicator changes from red to green when the The label colors and the corresponding speakers are as
subwoofer receives a signal. follows:
C. OUTPUT LEVEL (Output level adjusting knob) Front left speaker and speaker cable: White
Use this knob to adjust the output level of the subwoofer. 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
SKW-120/HTP-120
A B C D
SPECIFICATIONS
1
Subwoofer SKW-120 Center speaker D-120C
Type Bass-reflex with built-in power amplifier Type 2 way bass reflex
Use For superbass-range reproduction Frequency response 100 Hz-25 kHz
Frequency response 30-120 Hz (when used with the DR-S2.2) Maximum input power 50 W
Maximum output power 60 W Output sound pressure level 85 dB/W/m
Dynamic output power 120 W Impedance 6 ohm
Input impedance 9.5 k ohm Speaker 8-cm woofer 2
Sensitivity Line 65 mV 1.5-cm tweeter
Speaker 20-cm woofer Cabinet capacity 1.5 L
Power supply AC 120 V, 60 Hz Dimensions (W H D) 265 130.5 79.5 mm
2 Power consumption 70 W (AC 120 V, 60 Hz) 10-7/16" 5-1/8" 3-1/8"
Dimensions (W H D) 235 493 488 mm Weight 1.3 kg 2.9 lbs.
9-1/4" 19-7/16" 19-3/16" Others Magnetic shielding
Weight 14.3 kg 31.5 lbs
Others Auto standby on/off
Satellite speaker D-120 Accessories
Type 2 way bass reflex Audio connection cable (1 pc.)
Frequency response 100 Hz-25 kHz 3.5 m speaker cables (3 pcs.: white, red, green)
Maximum input power 40 W 8 m speaker cables (2 pcs.: blue, grey)
Output sound pressure level 82 dB/W/m Spacers for Subwoofer (4 pcs.)
Impedance 6 ohm Spacers for Satellite and Center speakers (black, 20 pcs.)
Speaker 8-cm woofer Horizontal mounting base (1 pc.)
3 1.5-cm tweeter Double-faced adhesive tapes (2 pcs.)
Cabinet capacity 0.8 L Cushioning pads (2 pcs.)
Dimensions (W H D) 85 120 112 mm Instruction manual (this manual)
3-3/8" 4-3/4" 4-7/16"
Specifications and appearance may subject to change for
Weight 0.7 kg 1.5 lbs.
improvement without prior notice.
Others Magnetic shielding
4
5
HTP-120
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, re-
place with same type fuse. For fuse rating refer to the marking adja-
cent to the symbol.
Ce symbole indique que le fusible utlise est a rapide. Pour une pro-
tection permanente, n'untiliser que fusibles de meme type. Ce darni-
er 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 in-
sulating-resistance tester between the plug of power supply cord and
screw on the back panel.
Specifications: 3.3M ohm+/-10% at 500V.
AC Leakage Test
Reading should
Leakage not be above
Device current 0.5mA
under tester
test
Test all
exposed metal
surfaces
Earth
ground
HTP-120
A B C D E
BLOCK DIAGRAM
NAAF-7456-1 U2
SUB WOOFER AMP. SPEAKER
6 ohm
P301 -2dB +28dB
OUTPUT +24dB
LEVEL
1 INPUT
LPF
Q301 POWER AMP
-6DB/OCT
600HZ
R303
NAETC-7457-1
U3 C301
LED Red
LED Green
2
THERMAL
AUTO_STANDBY MUTE
PROTECTION
ON/OFF CIRCUIT
CIRCUIT CIRCUIT
U1 NAAF-7455-1
+5.6V D931
1 D933 C931
3 +14.4V
Q951
D932
O G I
1 T901
Q952 POWER TRANS
- 14.4V
O G I
1
D911
+B D_ARRAY
1 AC IN
F901
C911 MDDAC120V
FUSE
GND
1
C912
HTP-120
-B
4 1
U4 NAPS-7458-1
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
NCAF-7455
C911
Trimmer
R544
P604
D911
Q623
Q514 Q513
P623
P531
C912
Q516 Q515
Q951 Q541
Q952
DC Volt meter
Setting position of shipping
Output level ---------------------- MIN
HTP-120
EXPLODED VIEW PARTS LIST NOTE: THE COMPONENTS IDENTIFIED BY MARK
ARE CRITICAL FOR RISK OF FIRE AND
Amp section ELECTRIC SHOCK. REPLACE ONLY WITH
P
ART NUMBER SPECIFIED.
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),
Self tapping screw (6)
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, Q516A 223021 TBM-51W 9043, Isolation sheet
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
CAUTION: Replacement of the transistor of mark * , if necessary,
must be made from the same beta group (HFE) as the
original type.
HTP-120
EXPLODED VIEW PARTS LIST
Cabinet section
PART NO. DESCRIPTION QTY
B02 KK200001-01 W20170A, SP assy 1
B03 Cabinet assy (Box+paper duct+ 1
plastic duct+sound absorbent)
B05 58-000-302-01 Foot 4
B06 76-200-030-01 Bottom board 1
B07 838440204 4STB+20A(BC), Amp, SP Unit 16
B08 70-015-450-01 4 x 50, Bottom board 4
B10 61-000-652-01 Socket assy
AM200008-01 SP Syatem 1
HTP-120
EXPLODED VIEW A1
SKW-120
(Subwoofer Amp.) R602
Q515
Q515A
Q541
Q516 B03
Q516A
Q952
Q951
A9
A11
A8
A45
U2
B07 U3
LINE
INPU
T
A10 B10
A42 A1
B07
(13) RE
D
GR : STA
OUT
PU
T LE
VE
L A50
EE
N: NDBY
ON
MIN
MA
X
A4 A4
A41
B02
A48 B07
B07
A2 B07 B07
B07 B05
B06
A4 B05
A3
B07 A4 B05
U1
B07
B05
B07 A6 F901 B08
A43
(4) CU
L
R
LIS US
TED
PO
M WE
U4
AU 80NA
OD RD
DIO E S
R A L N UBW
EQ /VID
UIP EO
E2 MENT
O
ACTING . S OOF
R
A47
06
13
0
12 : KW ER
2-1, 0V -1 20
B07 JA NISSH
PA
N IN
-C
HO
,N
60
Hz
70
W
B08
WA EY
AG
RISK RN AW
OF EL IN G
EC
DO NO TRIC
A-
MADSHI,
E IN OSA
T OP SHOC JA KA,
EN K PA
N
RI SQUE A V
DE CH IS
NE PA OC EL
S OU ECTR
VRIR IQUE
A44 B08 D-120 (Satellite)
SER
NSP
IAL
P000
P901 0000
0000
0000
00
E901 T901 D-120C (Center)
B07
NSP
B07
A46
ON
KY
O
NOTE: THE COMPONENTS IDENTIFIED BY MARK
ARE CRITICAL FOR RISK OF FIRE AND ON
KY
ELECTRIC SHOCK. REPLACE ONLY WITH O
PART NUMBER SPECIFIED.
NSP: Not service parts
HTP-120
A B C D E F G H
SCHEMATIC DIAGRAM
AMP. SECTION
NAAF-7456 U2 R319
5.6K
NJM4558DX
1 INPUT
C304
3
1 R313 R314 R315 5
NJM4558DX
NJM4558DX
C302 NIM4558DX 100/16 Q302
2 3.3K 2.2K 5.6K 7 R316 R317 3 8
LEVEL
P301
100/16 R307 Q303
5 22K C308 6 5.6K 1
2.2K
C310 Q303
C303 7 R312 2
Q301 124
R301 100/16 6 R308 3.3K 124 4
22K 470 C307
R306 C309 R318
R302 R303 NJM4558DX 152 124 C311
15K 1K
C301 100K 20KA C315
R304 C314 8 R311 124
C305 C306 5 563
223 100K 100K
152 274 154 7
Q302
3 8 NJM4558DD R309 6
R305 1 270 4
Q301
1K 2 160Hz
4 R310
82K
P501A
C312 C313
2 220/16 220/16
NAETC-7457
P601B
SML-1216W
GND1
D641
-14.4V P501B
R506 R512
R505 R510 NOTE
GND2 Q509 82
1K 1K 82
+14.4V (1/4W) (1/4W) (1/4W) 2SA949Y
(1/4W)
1.6V
. THE COMPONENTS IDENTIFIED BY MARK ARE CRITICAL FOR SAFETY
37.9V
REPLACE ONLY WITH PART NUMBER SPECIFIED.
U3
P601A
JL951A Q517 Q513
Q505
2SA933S-S . VOLTAGE (MEASURED WITH VOLTMETER) IS DC VOLTAGE. (NO INPUT SIGNAL)
2SA949Y
C505
R516
Q518
2SD667A-C
Q515 2SC4468 . ALL PNP TRANSISTORS ARE EQUIVALENT TO 2SA1015-GR UNLESS OTHERWISE NOTED.
37.9V R541 3.3K
2SC4793 or
2SC5198
. ALL NPN TRANSISTORS ARE EQUIVALENT TO 2SC1815-GR UNLESS OTHERWISE NOTED.
NAAF-7455 JL951B 820
1
. ALL DIODES ARE EQUIVALENT TO 1SS133 UNLESS OTHERWISE NOTED.
-14.4V
R525
idling current
GND1
GND2
LEDG
LEDR
+14.4
Test point of
R523 R533
. ELECTROLYTIC CAPACITORS (
SG
Q501 Q502 -1 330
82 ) ARE IN u F/WV.