Onkyo TX-8522 Service Manual page 40

ADJUSTMENT AND CONFIRMATION PROCEDURES 2
3. Confirmation of Current detection circuit
Set the unit to "TEST-1-00".
Connect the differentiating circuit and apply the 50Hz square signal to CD terminal
of each channel.
Adjust the attenuator or Volume so that the output level becomes 30V p-p.
Confirm that the speaker relay does not turn OFF when a 2.0 ohm load is connected.
Confirm that the speaker relay turns on when a 0.5 ohm load is connected.
CR
OSCILLATOR
DIFFEREN-
TIATING
CIRCUIT
50Hz
SQUARE
INPUT
0.1 F
3.3k
GND
FL TEST MODE
1. Press and hold down CD button, then press STANDBY/ON button.
2. After "TEST-" on the FL tube is displayed, press CD button to set the unit to the test mode of FL tube.
Test mode of FL tube
All segments
light on.
TUNING UP
TUNING DOWN
Letter from 1 to F
light on.
The segments of odd
number light on .
The segments of even
number light on .
"Model Name "
light on.
CD
INPUT
ATTENU-
ATOR
3.3k
1SS133*6
10k
Differentiating Circuit
Confirmation of microprocessor version
Press and hold down DISPLAY button,
then press STANDBY/ON button.
Confirmation of thermal detector
Press and hold down DISPLAY button,
then press STANDBY/ON button.
During Microprocessor version is displayed,
press SPEAKER B button.
SPEAKER
TERMINAL A
UNIT
OSCILLO-
SCOPE
OUT-
PUT
0.01 F
TX-8522
30Vp-p