Onkyo HTP 528 Service Manual
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Extracted text from Onkyo HTP 528 Service Manual (Ocr-read)
Page 1
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ONKYO SERVICE MANUAL
5.1-CH HOME THEATER SPEAKER PACKAGE
Front Speakers (L / R)
"SKF»528"
Cannot remove the speaker grill.
MODEL HTP-528(B)/(S)
Surround Speakers (L / R)
SKR-528"
Center Speaker
"SKC-SZS
Black and Silver models
B MPP 230V AC, 50Hz
S MPP 230V AC, SOHZ
SAFETY-RELATED COMPONENT
WARNING! !
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 SI SOUND
Powered Subwoofer
"SKW-SOl "
HTP-528
No. 4137
042009
Page 2
ADJUSTMENT PROCEDURE
SKW-501 : POWERED SUBWOOFER / ADJUSTMENT OF IDLING CURRENT
[When]
1. Exchange transistors (Q505 - Q519).
2. Exchange MAIN PC board ass'y (NAAF-8829).
[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 AC power cord into a wall outlet.
5. Press POWER button to turn on the unit.
6. Confirm the voltage of above point after 6 minutes to 8 minutes. (Heat running)
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 3.30 mV to 5.20 mV : Not necessary to adjust.
HTP-528
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.
8. Disconnect the AC power cord from a wall 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 ass'y "NAAF-8829"
Test point
P631
Short
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