Onkyo HTP 980 Service Manual
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Extracted text from Onkyo HTP 980 Service Manual (Ocr-read)
Page 1
HTP-980
Ref. No. 4236
ONKYO SERVICE MANUAL °°°
7.1-CH THX CERTIFIED
HOME THEATER SPEAKER PACKAGE
MODEL HTP-980(B)
- - Surround Back Speakers (L/R) » - - - Powered Subwuofer - -
HSKB'980" - - Front Speakers (L/R) - - - - Surround Speakers (L/R) - - "SKW980"
- - Center Speaker - -
"SKC-980"
Black model
- 120V AC, 60Hz
SAFETY-RELATED COMPONENT
WA R N I N G I I
COMPONENTS IDENTIFIED BY MARK A 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 0R RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE To THE CUSTOMER.
ONKYO®
IMAGINATIVE SIGHT & SOUND
Page 2
ADJUSTMENT PROCEDURE
SKW-980 : POWERED SUBWOOFER (EuP AMP.)/
ADJUSTMENT OF IDLING CURRENT
[When]
1. Exchange transistors (Q505 - Q519).
2. Exchange MAIN PC board ass'y (BAAF-0491).
[Procedure]
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.
4. Connect the power cord into the AC outlet.
5. Press POWER button to turn on the unit. (MPP only)
6. Confirm the voltage of above point after 6 minutes to 8 minutes. (Heat running)
HTP-980
7. When less than 3.20 mV : Readjust the trimming resistor above so that the voltage becomes 4.5 mV to 5.0 mV.
When 330 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 50 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.
8. Disconnect the power cord from the AC outlet.
9. Disconnect the DC voltmeter.
Trimming resistor
R544
Test point
P531
100 ohm
(1/4W)
DC voltmeter
o
Test point 00
P531
O
MAIN PC board assy "BAAF-O491" (EuP Amp.)
Test point
P63 1
Short