Onkyo DX-7511

ADJUSTMENT
PROCEDURES
3.
Focus
gain
adjustment
Set the output of AF oscillator to 800Hz, 1~1.5Vp-p.
Play the track 2 of test disc.
Instruments required | 7 | Connect the oscilloscope and the AF oscillator as shown
Dual trace oscilloscope, Frequency counter, AF oscillator, Test disc (SONY YEDS-18) and AC voltmeter. below.
AF
oscillator
GND
1. Focus offset adjustment.
Turn R120 and R121 to the mechanical center.
Load the test disc YEDS-18 on the tray and play the track 2.
Connect the oscilloscope to terminal P105. ~
Adjust R119 until the waveform on the oscilloscope becomes
maximum.
After adjustment, disconnect the oscilloscope.
0.5V/div
0.5ms/div
P106_
Photo 3
Oscilloscope
Adjust R120 until 800Hz components of channels 1and 2 on
oscilloscope become same level. |
After adjustment, disconnect the AF oscillator and the
0.2V/div | | | oscilloscope. | | | |
0.2us/div
Photo 1
4, Tracking gain adjustment
Set the output of AF osillator to 1.2kHz, 1~1.5Vp-p.
Play the track 2 of test disc.
2.
Tracking
offset
adjustment
|
7
Connect
the
oscilloscope
and
the
AF
oscillator
as
shown
below.
Load the test disc YEDS-18 on the tray and play the track 2.
Turn R121 to minimum position. (Counter clockwise)
Connect the oscilloscope across pin 1 ( TE2 ) of P106 and
pin 1(Vref) of P105. |
Adjust R116 until the center of tracking error signal on the
oscilloscope becomes GND level.
Turn R121 to the mechanical center.
After adjustment, desconnect the oscilloscope.
AF
oscillator
0.5V/div
0.5ms/div
ae
TE2
A P106.
Photo 4
TE2 TE
Oscilloscope |
A
B GND level Adjust R121 until 1.2kHz components of channels 1and 2 on
A=B oscilloscope become same level.
After adjustment, disconnect the AF oscillator and the
Photo
2
oscilloscope.
|
| Vref After adjustment, confirm that the center of tracking error signal
0.5V/div | becomes GND level.
5ms/div | — P105
~19- , | | 3 | ~ 20 -
TE2 TE1
Oscilloscope
CH2
Oscilloscope