Onkyo TX 8222 Service Manual

Page 1

TX-8222

Ref. No. 3945

ONKYO SERVICE MANUAL 52°

STEREO RECEIVER
MODEL TX-8222

FIG-6665

(a).
\El
Black and Silver models
BMDD,BMDC 120V AC, 60Hz
BMPP,SMPP,BMPA 230-240V AC, SOHz

SAFETY-RELATED COMPONENT
WARNING! !

COMPONENTS IDENTIFIED BY MARK A ()N THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ()NKYO
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.

ONKYO®

IMAGINATIVE SIGHT & SOUND

Page 21

ADJUSTMENT AND CONFIRMATION PROCEDURES 1
Idling current adjustment

Before Idling adjustment, turn the trimming resistors R587 and R588 to counter clockwise.
Connect the DC voltmeter to terminals P511 and P512.

After turn POWER to ON, adjust the trimming resistors R587 and R588 so that the reading of
voltmeter becomes 2.5 mV.

After adjustment, attach the top cover.

Confirm the voltage of points above after about five minutes.

When less than 4.5 mV, readjust the resistors above so that the voltage becomes 4.5 mV.
When 4.5 mV to 5.5 mV, you are not necessary to adjust.

When more than 5.5 mV. readjust the resistors above so that the voltage becomes 5.5 mV.

0
P511 D P9165 ° C
P914B R588
JL711B R587
:I
£9135 JL91BB
JL71GB 3
o S
I] P91 SB
JL261 B 3
o
D a
MAIN CIRCUIT
Pc BOARD
(NAAF-saas) m
E
o
N
:3!
JL613A
v
w
0
P701 B P7023
|:|l:l

LlLlLlLlLlLlLlLlLl UUUU

Confirmation of protection circuit

1. Confirmation of operation of speaker relay

Confirm that the speaker relays turn ON approximate. 5 seconds after the power switch is turned ON.

Confirm that the speaker relays turn OFF immediately after the power switch is turned OFF.

2. Confirmation of DC detection circuit
Press and hold down CD button, then press STANDBY/ON button.
After "Test- " on the FL tube light on, press DVD button to set the unit to "TEST-1 00".
Turn VOLUME to the maximum position. Apply DC 1.5 to 3V to CD terminal with no load.
Confirm that the speaker relay turns OFF.
Apply DC -1.5 to -3V to CD terminal with no load.
Confirm that the speaker relay turns OFF.
Caution: Don't apply DC voltage more than 1 sec..

T 8222