Sony CDP-XA555ES Service Manual page 47

Main Ports
SPDL-MUTE (pin qj)
From the viewpoint of performance of the set, the disc must not
move nor sway when the disc table opens. These problems
however occur in the actual case due to the offset voltage
generated and the voltage generated because of the positional
relation between the BSL coil and Hall element.
The spindle motor driver (IC104, IC105) is therefore muted
while the tray is open. Pin qj provides the timing for this.
H
SP MUTE
L
(MUTE ON)
OPEN
Reverses after a certain
period of time.
Time while the disc
can be seen
(Estimate).
BLANK (pin wa)
This port is required because the display tube in this set static-
lights up and a dedicated screwdriver is required. It is basically
a RESET pin. But as problems will occur if used also as
RESET, timings are specially provided using the micro-
processor.
SENSER SW (pin wj)
As IC203 IS471F operate in pulse as shown in the figure, the
sound quality may be affected if operated constantly. As the
purpose of IC203 is to detect if the presence of the stabilizer, it
should be operated only when the tray is drawn in. IC203
operates as it is "H" only at this time. Normally it is "L".
Ee
0
GLout pin
output waveform
Eep is the luminance of the signal light tuned with the low
*
level timing of the GLout pin output.
Eed is the luminance of the D.C. light. The light source is the
infrated-emitting diode (λp=940 nm).
PLAY
CLOSE
SPINDLE
KICK
Reverses after a
certain period
of time.
The spindle
motor driver is
muted during
this time.
Eep
Eed
Time
SENSER (pin wk)
The results of the detection of IC261 IS471F is output to this
pin. It becomes "L" when there is no stabilizer (when light
reaches). The next process of imposing the next focus is not
performed. (Effective only when pin wj is "H".)
Therefore, it must be noted that if PLAY is performed when the
servo board at the top of the CDM is not assembled properly,
the detection circuit operates and this pin does not operate.
It is does not operate, refer to "1. SERVICING NOTES " on
page 3.
47