Sony CFD-449 Service Manual page 10

The following is a simple adjustment method.
—Simple Adjustment—
Note : Since exact adjustmeunt cannot be performed,
remember the positions of the controls before perfor-
ming the adjustment. If the positions after the simple
adjustment are only a little different, return the con-
trols to the original position.
oscilloscope
(DC range)
CD main board
oon O
Procedure :
{
TP (TE) Om- -7
TP (VREF)
1. Keep the set horizontal.
If the set not horizontal, this adjustment cannot be
performed due to the gravity against the 2 axis device.
Put the set into test mode.
Connect oscilloscope to CD main board TP (FE).
Insert disc (YEDS-18) and press > button.
Adjustment RV703 so that the waveform is as shown in
the figure below. (focus gain adjustment)
Sa Cont
VOLT/DIV: 100mV
TIME/DIV: 2mS
100mV
Ky AY" oe
OV
e Incorrent Examples (DC level changes more than on adjust-
ed waveform)
low focus gain
TIME/DIV: 2mS
250mV
high focus gain
TIME/DIV: 2mS
100mv
75mvV
OV
VOLT/DIV: 100mvV
VOLT/DIV: 100mv
6. Connect oscilloscope to TP (TE).
7. Adjust RV704 so that the waveform is as shown in the
figure below. (tracking gain adjustment)
8. Release test mode after adjustment is completed.
VOLT/DIV: 1V
TIME/DIV: 2mS
OV
® Incorrect Examples (fundamental wave appears)
low tracking gain
VOLT/DIV: 1V
TIME/DIV: 2mS
OV
high tracking gain .
(higher fundamental wave than for low gain)
VOLT/DIV: 1V
TIME/DIV: 2mS