IBM System/370 Operator's Reference Manual page 197

IBM 1403 Printer (Cont'd)
2501 CARD READER
Stacker
< ______
.....J
Station
Hopper
Ready indicates that the 2501 can accept a command from the program.
The ready light comes on when the following conditions exist:
1.
Power is on.
2. A card is registered at the pre· read station.
3. Cards are in the hopper, or the end·of·file key has been pressed.
4. The stacker is not full.
5. No feed check condition exists.
6. No cover interlocks are opened.
7. The stop key has not been pressed since the last depression of the start key.
NOTE: Device end status is generated when the 2501 is made Ready. If the
2501 is made Not Ready, and then made Ready again before the channel
accepts the first Device End, the ready light does not come on until this
status is accepted.
Read Check (Equipment Check sense indicator) comes on when a card is not being
read properly. This condition can result from off·punched cards or incorrect registra·
tion of cards in the transport. The Read Check is reset by the next read command
from the program when the 2501 is not busy.
Validity Check (Data Check sense indicator) informs the operator that the card just
read in data mode 1 contains more than one punch in rows 1·7 of a column. The
validity check is reset by the next read command from the program when the 2501 is
not busy.
Feed Check (lntervention·Required sense indicator) indicates a card jam or improperly
positioned card in the hopper, transport, or stacker; or a failure of one of the read·
station photocells or lamps. Usually, a feed check can be reset by an NPRO operation;
otherwise, the operator must manually remove jammed cards from the transport or
stacker area.
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