Onkyo TX-7920 - Adjustment Procedures - General; Preparation and Standard Knob Settings; Amplifier Idling Current Adjustment

TX-7900/TX-7920
ADJUSTMENT PROCEDURES
Preparation
1.Input
FM mono:1kHz,75kHz devi.,60dB/ » V
FM stereo: 1kHz,75kHz devi.,60dB/ nu V
Pilot signal 19kHz 7.5kHz devi.
AM:400Hz 30% mod.
2.Outputs
Connect the non-inductive type resistors of 8 ohms
to the speaker terminals A unless otherwise noted.
3.Standard Knob Position
VOLUME ii vtisdessscssescdsescsseessenveas Maximum
BASS/TREBLE/BALANCE............ Center
MUTING/LOUDNES.G.................. Off
INPUT SELECTOR...................06 CD
SPEAKERS... ccc cecceeseceeseceneees A
Confirming Operation
1.Protection circuit
a. Speaker relay
The speaker relay turns on after the power switch turned on for 5 minutes.
The speaker relay turns off immediately after the power switch turns off.
b. Over-voltage confirmation
The speaker relay is off immeditely after DC voltage + 6V is applied to the terminal CD.
Amplifier section
Idling Current Adjustment
Connect the DC voltmeter to the terminals LID(RID) and CT on the power amplifier pc board.
Adjust the semi-fixed resistor R511(R512) so that the indication of voltmeter is 5+0.5mV.
Note:(_ ):Right channel
R512 =) 9S R511
o LID
0 VCT
RID o
VCT o
—~18—
POWER AMPLIFIER PC BOARD
SOLDERING SID!