Onkyo HTP-780 Service Manual
SERVICE MANUAL
SERVICE MANUAL
7.1-CH HOME THEATER SPEAKER PACKAGE
MODEL HTP-780(B)
Powered Subwoofer
Surround Speakers (L / R)
"SKR-780"
HTP-780
Ref. No. 4229
062010
"SKW-780"
Front Speakers (L / R)
"SKF-780"
Center Speaker
"SKC-780"
Surround Back Speakers (L / R)
"SKB-780"
Black model
B MDC
120V AC, 60Hz
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
[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
Trimming resistor
R544
Test point
P531
Test point
P531
100 ohm
(1/4W)
<Fig-1>
DC voltmeter
MAIN PC board ass'y "NAAF-8829"
Test point
P631
Short
EXPLODED VIEWS-1
SKW-780 : POWERED SUBWOOFER
P901
A05
x 2 pcs.
A102
A103
HTP-780
SP11
x 10 pcs. (NSP)
A02
A104
x 2 pcs.
A02
A03
A06
U01
A05
x 5 pcs.
U06
A101
A07
Q516
A08
x 2 pcs.
A05
Q541
A01
A07
A11
Q515
E801
Refer to "EXPLODED VIEWS-2"
SP12
x 4 pcs.
(NSP)
SP13
x 2 pcs.
U03
HTP-780
T901
F901
HTP-780
EXPLODED VIEWS-2
SKW-780 : POWERED SUBWOOFER
SP01a (Subwoofer ass’y)
(All)
SP01b (Subwoofer ass’y)
(Without AMP unit, Speaker unit and Power transformer)
SP08
SP06
SP02
x 4 pcs.
HTP-780
EXPLODED VIEWS-3
SKF-780 <L> / SKF-780 <R> / SKC-780
<Note>
Cannot remove the speaker grill.
SP21 (Speaker ass’y)
SP25 (Speaker ass’y)
HTP-780
<Note>
Cannot remove the speaker grill.
SP23 : WOOFER
SP24 : TWEETER
Lch
TERMINAL :
White / Black
"SKF-780 <L>"
SP26 : WOOFER
SP27 : TWEETER
Rch
TERMINAL :
Red / Black
"SKF-780 <R>"
SP41 (Speaker ass’y)
TERMINAL :
Green / Black
SP43 : WOOFER
SP44 : TWEETER
"SKC-780"
NOT MAGNETICALLY SHIELDED
NOT MAGNETICALLY SHIELDED
HTP-780
EXPLODED VIEWS-4
SKR-780 <L> / SKR-780 <R> / SKB-780 <L> / SKB-780 <R>
SP61 SP63
HTP-780
<Note>
Cannot remove the speaker grill.
TERMINAL :
Blue / Black
TERMINAL :
Brown / Black
TERMINAL :
Gray / Black
"SKR-780 <R>""SKR-780 <L>"
NOT MAGNETICALLY SHIELDEDNOT MAGNETICALLY SHIELDED
SP65 SP67
TERMINAL :
Tan / Black
HTP-780
"SKB-780 <R>""SKB-780 <L>"
NOT MAGNETICALLY SHIELDED NOT MAGNETICALLY SHIELDED
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