47
GLout pin
output waveform
Main Ports
SPDL-MUTE (pin qj)
Fromthe viewpointofperformance 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.
OPEN
Reverses after a certain
period of time.
SP MUTE
(MUTE ON)
CLOSE
SPINDLE
KICK
Reverses after a
certain period
of time.
PLAY
Time while the disc
can be seen
(Estimate).
The spindle
motor driver is
muted during
this time.
BLANK (pin wa)
This port is required because the display tube in this set static-
lights up and a dedicatedscrewdriver 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”.
E
Eep is the luminance of the signal light tuned with the low
level timing of the GLout pin output.
Eed is the luminanceof the D.C.light. The light source is the
infrated-emitting diode (λp=940 nm).
*
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.
To Next Page
