Onkyo HTP-780 User manual

HTP-780
SERVICE MANUAL
SERVICE MANUAL
7.1-CH HOME THEATER SPEAKER PACKAGE
Black model
MODEL HTP-780(B)
Ref. No. 4229
062010
120V AC, 60Hz
B MDC
Front Speakers (L / R)
"SKF-780"
Center Speaker
"SKC-780"
Surround Speakers (L / R)
"SKR-780"
Powered Subwoofer
"SKW-780"
Surround Back Speakers (L / R)
"SKB-780"
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.

ADJUSTMENT PROCEDURE
SKW-780 : POWERED SUBWOOFER / ADJUSTMENT OF IDLING CURRENT
HTP-780
Test point
DC voltmeter
100 ohm
(1/4W)
P531
<Fig-1>
Test point
P631
MAIN PC board ass'y "NAAF-8829"
Test point
P531
Trimming resistor
R544
Short
[When]
1. Exchange transistors (Q505 - Q519).
2. Exchange MAIN PC board ass'y (NAAF-8829).
[Procedure]
<Note> No speaker load and No input signal.
1. Short test point P631 for amplifier is under active mode.
2. Adjust the trimming resistor R544 so that the reading of multimeter becomes 52 ohm to 53 ohm.
3. Connect the DC voltmeter to test point P531. <Fig-1>
4. Connect the power cord into the AC outlet.
5. Confirm the voltage of above point after 6 minutes to 8 minutes. (Heat running)
6. When less than 3.20 mV : Readjust the trimming resistor above so that the voltage becomes 4.5 mV to 5.0 mV.
When 3.30 mV to 5.20 mV : Not necessary to adjust.
When 5.21 mV to 10.0 mV : Readjust the trimming resistor above so that the voltage becomes 5.0 mV to 5.5 mV.
When 10.1 mV to 20.0 mV : Readjust the trimming resistor above so that the voltage becomes 5.6 mV to 6.0 mV.
7. Disconnect the power cord from the AC outlet.
8. Disconnect the DC voltmeter.

HTP-780
EXPLODED VIEWS-1
SKW-780 : POWERED SUBWOOFER
HTP-780
A08
x 2 pcs.
SP11
x 10 pcs. (NSP)
A104
x 2 pcs.
A05
x 2 pcs.
A05
x 5 pcs.
A103
A102
P901
U03
A11
E801
A01
U01
A07
A07
A101
A02
A02
A06
U06 A05
Q515
Q516
Q541
F901
T901
A03
SP12
x 4 pcs.
(NSP)
SP13
x 2 pcs.
Refer to "EXPLODED VIEWS-2"

HTP-780
EXPLODED VIEWS-2
SKW-780 : POWERED SUBWOOFER
HTP-780
SP06
SP08
SP02
x 4 pcs.
SP01a (Subwoofer ass’y)
(All)
SP01b (Subwoofer ass’y)
(Without AMP unit, Speaker unit and Power transformer)

HTP-780
EXPLODED VIEWS-3
SKF-780 <L> / SKF-780 <R> / SKC-780
HTP-780
SP21 (Speaker ass’y)
SP41 (Speaker ass’y)
SP23 : WOOFER
SP24 : TWEETER
SP43 : WOOFER
SP44 : TWEETER
SP25 (Speaker ass’y)
SP26 : WOOFER
SP27 : TWEETER
"SKF-780 <L>"
"SKC-780"
<Note>
Cannot remove the speaker grill.
<Note>
Cannot remove the speaker grill.
Lch
TERMINAL :
White / Black
Rch
TERMINAL :
Red / Black
TERMINAL :
Green / Black
NOT MAGNETICALLY SHIELDED
NOT MAGNETICALLY SHIELDED
"SKF-780 <R>"

HTP-780
EXPLODED VIEWS-4
SKR-780 <L> / SKR-780 <R> / SKB-780 <L> / SKB-780 <R>
HTP-780
SP61 SP63
SP65 SP67
"SKR-780 <R>""SKR-780 <L>"
TERMINAL :
Blue / Black
TERMINAL :
Gray / Black
"SKB-780 <R>""SKB-780 <L>"
TERMINAL :
Brown / Black
TERMINAL :
Tan / Black
<Note>
Cannot remove the speaker grill.
NOT MAGNETICALLY SHIELDED NOT MAGNETICALLY SHIELDED
NOT MAGNETICALLY SHIELDEDNOT MAGNETICALLY SHIELDED

HTP-780
PRINTED CIRCUIT BOARD VIEWS-1
SKW-780 : POWERED SUBWOOFER
U01 MAIN PC BOARD (NAAF-8829)
Component side
7
25
12
17
15
12
15
7
7
17
12
17
7
7
7
7
7
7
7
7
7
7
22
20
20

HTP-780
PRINTED CIRCUIT BOARD VIEWS-2
SKW-780 : POWERED SUBWOOFER
15
15
15
15
NCPS-8831
25138831
RISK OF FIRE
-REPLACE FUSE
AS MARKED.
2
23 56
810121416
AC-H AC-G
P902A
F901A F901B
5A/125V
F901
1P905A
P907A
P906A
J901
J905
J903
J904
J902
T901
T901
P903A
P901A
AC-GAC-H
A
1
2
3
4
5
BCD
U03 POWER TRANSFORMER PC BOARD (NAPS-8831)
Component side

1/12 PAGE
HTP-780
EXPLODED VIEWS PARTS LIST
<Notes>
<L> : Lch
<R> : Rch
REF. NO. PART NAME DESCRIPTION Q'TY PART NO. (SN) REMARKS
EXPLODED SKW-780 (B) : POWERED SUBWOOFER
EXPLODED AMPLIFIER SECTION (SKW-780)
EXPLODED [SEMI CONDUCTOR]
EXPLODED Q515 TR 2SC5359-R 1 2203082 !
EXPLODED Q515 or TR 2SC5359-O ( 1) 2203083 !
EXPLODED Q516 TR 2SA1987-R(Q) 1 2203072 !
EXPLODED Q516 or TR 2SA1987-O ( 1) 2203073GR !
EXPLODED Q541 TR 2SC3423-Y 1 2202104
EXPLODED Q541 or TR 2SC3423-O ( 1) 2202103
EXPLODED <Note>
EXPLODED When replacement the following the transistor, made from the same HFE rank as the original type.
EXPLODED Q515, Q516, Q541
EXPLODED [CHASSIS SCREW]
EXPLODED A01 HEAT SINK 230 1 27160591
EXPLODED A02 CUSHION --- 2 28141682
EXPLODED A03 CUSHION --- 1 28141691
EXPLODED A05 SCREW 3TTB+8B(3BC) 8 838430088GR
EXPLODED A06 TAPE TAPE(CLOTH-16U) 1 29110083
EXPLODED A07 ISO SHEET AC262 2 223025
EXPLODED A08 SCREW 3SMS8W.SW+14B(CU) 2 801634
EXPLODED A11 RETAINER (PCB) 1 27142025
EXPLODED A101 REAR PANEL SKW-780AMP(X)MDD/MDC 1 27124183
EXPLODED A102 BUSHING S-RELIEF #2271 1 27300750 !
EXPLODED A103 KNOB (VOL) 1 28326463
EXPLODED A104 SCREW 3SMS8W.SW+14B(3BC) 2 801433GR
EXPLODED [TRANS COIL]
EXPLODED T901 P TRANS NPT-1578D 1 2301948 !
EXPLODED [SW TRM]
NOTE : THE COMPONENTS IDENTIFIED BY THE MARK
!ARE CRITICAL FOR RISK OF FIRE AND
ELECTRIC SHOCK. REPLACE ONLY WITH PART
NUMBER SPECIFIED.