Solution
1. Press [Menu].
2. Use [Up/Down] to select [PAPER SOURCE SETUP?], then press [Set] ([OK]).
3. Use [Left/Right] to select the paper type, then press [Set] ([OK]).
[PLAIN]: Plain paper.
[PLAIN L]: Light paper.
[HEAVY]: Heavy paper.
[HEAVY H]: Heavier paper.
[TRANSPARENCY]: Transparencies.
4. Use [Left/Right] to select the paper size, then press [Set] ([OK]).
[LT]: Letter.
[LG]: Legal (not available for transparencies).
[A4]: A4.
5. Press [Stop/Reset] to return to standby mode.