Alpine 7980M - Page 15

7980M
Tuner Unit
Oscilloscope (AC MODE)
Changer Unit
(3) Control Settings (Changer Unit)
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Fader Control ................0.00000e Center Position
Balance Control ..................-... Center Position
Treble/Bass Control .................. Center Position
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(4) Adjustment Procedures
Test CD [connection [Text Point |Adjustment Point Adjustment
: Set the mode to playback
with the test disc loaded.
: Using the jitter meter, measure the
T.P.1 signal.
: First, rotate VR103 fully counter -
clockwise.
: Next, carefully rote VR103
clockwise untill the jitter meter
shows a minimum value and then
increases by +0.5nS from the
minimum value.
TCD - 782
Jitter
Track Figure 8
No.1
(A-BEX)
® © ® Oo
Adjustment
: Set the mode to playback
with the test disc loaded.
: Connect the wire of T.P.3 to T.P.4.
: Using the oscilloscope, measure the
T.P.2 signal in reference to VR.
(VR standard =0V)
@: Adjust VR101 so that the positive
and negative deflection widths of
the T.P.2 signal are at the same
level, relative to VR (OV).
(The entire waveform moves up
and down.)
TCD - 782
Track
No.8
(A-BEX)
Tracking
Balance Figure 9
Adjustment
©: After adjustment, disconnect the
wire of T.P.3 and T.P.4
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