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193
ERROR CODES, LIGHTS, SWITCHES, AND
TEST POINTS (CONTINUED)
Lights
Normal Mode
Thirteen lights are located on the control panel of the
printer for use by the operator and the customer
engineer. They are as follows:
Power On-Indicates that power is present at the
printer and
+5, -5, +8.5, +10.8
Vdc and
24
Vac are
OK.
Ready-Indicates that the printer can be used for
customer jobs. The light is turned on by pressing the
Start switch and is turned off by unrecoverable
errors, by an attention message from the host
system, or by pressing the Stop switch.
Line Sync (I)-Indicates that the printer has
recognized any character, command, or data sent by
the controller over the system cable. The command
or data characters can be for any printer or display
station on the cable (if the Cable Thru feature is
installed). The light goes off if there are more than
.115
ms between recognizable characters.
System Available (2)-lndicates that the printer has
detected its address in a command. The light turns
off if the printer does not receive a command for
480
ms.
Line Check (3)-lndicates that the printer has detected
a parity error in a command or data sent from the
controller. When the Cable Thru feature is installed,
all stations turn this light on even if the command or
data is not addressed to them. The addressed station
returns an error response to the controller. The
controller resends the information that contained the
error until the information is received with no error.
After the information is received without error, the
light is turned off.
Storage Check (4)-lndicates that a parity error has
been detected in the basic storage located on the
logic planar.
Internal Check (5)-Used only during power on
sequen'ce and when checking status in test mode.
..
Graphic Check (6)-lndicates that an unprintable
character has been detected by the printer and the
printer is set up to stop on this condition by the host
program. The Attention light will be on and the
Ready light will be off.
1-90
Data Cleared (7)-lndicates that a clear command {to
reset the input buffers) has been received from the
host. (This is part of the error recovery procedure for
hard errors.)
Transparent Mode (B)-Indicates that printer is in a
mode of operation in which the hexadecimal code for
each byte of input data is displayed directly above
the output 'of the character from the character
generator. SNA formatting control characters,
parameters, and characters not recognized by the
character generator will be printed as
a
hyphen.
Attention-Indicates to the operator that manual
intervention is required. Attention is turned on with
the Graphic Check, Unit Check, and Forms lights. If
the Audible Alarm feature is installed, the alarm also
sounds. The light is also turned on by a BEL SCS
control character in the data stream.
FO"!1s-lndicates that a forms error was detected by
the hardware. If the Forms and Attention lights are
on and the Unit Check light is off, the printer is out
of paper. If the Forms, Unit Check, and Attention
lights are on, the forms were moved manually while
the Ready light was on, a failure occurred in the
paper movement mechanism, or a forms jam
occurred.
Unit Check-Indicates that a hard error was detected
while printing. This error is reported to the host in a
'read status' command. The Attention light will be
on.
Note: The lights associated with the numbers 1
through 8 have multiple meanings as follows:
During power on sequence, they are turned off
sequentially as each segment of the power on
diagnostic is completed.
-
.
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