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C-701A
ADJUSTMENT PROCEDURE
R123
P104
P105
1. SERVO ADJUSTMENT
1-1. Preparation
Set the VR123 is center position.
Connect the cables to the test point. (Fig.-1)
1-2. Focus gain adjustment
Load the test disc (YEDS-18) on the tray and play the track 2.
Adjust R123 until 1kHz the waveform of channels 1 and 2 on
oscilloscope become specified level.
Check the jitter meter reading . It must be less than 12ns.
1-3. Remove the oscilloscope and audio oscillator.
FE1
FE2
VC
(RF)
CH 1 CH 2
++
GG
GG
+
GG
+
NADG-7323
R123
Audio
Oscillator
Oscilloscope
(Fig.-1)
(Fig-2)
CH1
CH2
A
B
A:B=1:1.25
Wave form
(Fig.-2)
Adjustment points
P105
P104
The driver for adjustment when adjusting is using the driver
for adjustment insulated so that it may not be effected of a hand.
The quality of the material insulated
Less than 1.4
Adjustment driver
LD Short
Land
Focus Gain
NADG-7323