Toshiba SD-2550A Service Manual page 41

3. TROUBLESHOOTING
3-1. Main Circuit
3-1-1. Servo System
(1) Initial Operation after Power ON
2
DVD single (single-layer)
DVD single
Initial setting.
Power ON
Send each LSI hard RST
command and initial command.
Pickup head is positioned at
transmission initial position.
Is tray closed?
Pin 5 of CN502,
TCLS=L
Y
Disc presence/absence and
NG
disc judgement
Is a disc present?
Y
DVD or CD initial setting.
DVD single
(single-layer)/DVD dual
(dual-layer)/CD?
DVD dual (dual-layer)
DVD dual
Initial setting.
To each disc playback process.
Fig. 1-3-1
1-37
1
N
Tray close operation
Pin 126 of IC605: LDMP = H/L
Pin 127 of IC605: LDMN = L
Is tray closed?
Pin 5 of CN502:
TCLS = L
Y
Tray stops.
Pin 126 of IC605: LDMP = H
Pin 127 of IC605: LDMN = L
N
Laser OFF
Display: INSERT DISC
Monitor screen: NO DISC
CD
CD
Initial setting.
N