LG HT903WA Service Manual page 13

4. System operation flow
1. Initializes SERVO, DSP & RISC registers.
2. Write RISC code to SDRAM.
3. Reset RISC.
YES
Tray close to closed position.
SLED moves to inner position.
1. Judge whether have disc and disc type.
2. Jump to related disc reading procedure.
1. Execute Pressed Key & IR Key.
2. System operation routine loop.
1. Stop Playback & Open Tray.
2. Display tray open message & LOGO.
NO
LGE Internal Use Only
Power on.
Show LOGO.
Tray closed?
NO
SLED at inner
side?
NO
Recieve
OPEN/ CLOSE
Key?
NO
YES
Receive
CLOSE Key?
YES
YES
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Only for training and service purposes