Zenith XBV 443, Service Manual

Page: 53 / 108

3-62
TE and TACT signals are output respectively from pin 54 and pin 34 of IC 202 during a normal play.
SLED signal is output pin 29 of IC 202 and flow into pin 15 and pin 18 of IC 201 to operate a sled motor
when to skip chapters or to scan.
IC202
pin34
(TACT)
IC202
pin54
(TE)
IC202
pin29
(SLED)
IC202
pin34
(TACT)
IC202
pin54
(TE)
IC202
pin29
(SLED)
The waveform during a normal play The waveform when to skip or scan
13. Checking the track jump
This is the waveform of FE and collector
outputs of Q205 and Q206 when to play DVD
Section A : CD_LD is ON and DVD_LD is OFF
Section B : DVD_LD is ON and CD_LD is OFF
This is the waveform of FE and collector outputs
of Q205 and Q206 when to play CD
Section C : CD_LD is ON and DVD_LD is OFF
Section D : CD_LD is OFF and DVD_LD is ON
Section E : CD_LD is ON and DVD_LD is OFF
The waveforms as below indicate “COLLECTOR” outputs of Q205 and Q206,
respectively when to play DVD and CD
IC202
pin55(FE)
Q205
COLLECTOR
Q206
COLLECTOR
IC201
pin15(SLED)
Q205
COLLECTOR
Q206
COLLECTOR
14. The status of CD_LD and DVD_LD in the PLAY MODE