Epson Stylus Color 980 Service Manual page 88

EPSON Stylus Color 980
Table 3-10. Remedies for No I/C and Ink Out Errors (continued)
Step Check Point
3 Is the micro switch fixed
improperly?
Is the connector (green)
disconnected?
4 Is the connector (green,
3-pin) disconnected form
the small board which is
directly attached to the
head surface side?
5 Is the micro switch
defective?
Troubleshooting
Actions
If the micro switch is not properly attached, the
actuators possibly fail to touch the micro switch.
Therefore, check that the micro switch is
securely attached to the carriage by the hooks.
Remove the printhead and check if the connector
(green, 3-pin) is disconnected from the small
board at the bottom of the printhead.
Note: The white 4-pin is irrelevant as it is for the
encoder.
1. Keeping the left micro switch pressed down,
place the probes of the tester to the middle
and left pins to check for electrical continuity.
2. Keeping the right micro switch pressed down,
place the probes of the tester to the middle
and right pins to check for electrical continuity.
Table 3-11. Remedies for No I/C and Ink Out Errors (continued)
Step Check Point
6 Is data in the EEPROM
destroyed?
7 Is the abnormal
temperature detection
circuit working?
Overview
Revision A
Actions
If the address for the ink consumption information
in the EEPROM is garbled and the printer shows
the Ink Out (Ink End) error constantly, the printer
sets the interface signal "BUSY" to High and stops
communication with any other peripheral devices.
Therefore, it is effective to replace the I/C with a
new one to forcibly overwrite the address with 00H.
Since the Stylus Color 980 drives a large number
of PZT with a high drive frequency, if the printhead
is driven without any ink filled in it, the printhead
abnormally heats up and may be damaged as the
result. Therefore, this printer monitors and controls
the temperature around the printhead more strictly
than any other printers do. In case the printer
detects abnormal rise in head temperature during
printing, it generates the I/C replacement
command after the sequence described below.
1. Detects an abnormal temperature during
printing.
2. Stops printing and begins a head cleaning. (This
operation solves the nozzle clogging problem in
most cases.)
3. Resumes printing.
4. If detects an abnormal rise in the head
temperature again, sets a flag and generates
the I/C replacement command. (The Ink LED
comes on.)
The printer mostly enters this sequence under the
following two conditions:
• Ink around the nozzles is severely viscous. (due
to removal and reinstallation of the I/C)
• Ink is leaking from the printhead because of a
large impact.
The temperature in the printhead actually rises
abnormally when half the nozzles in any nozzle
row are clogged, or 48 nozzles in any 96-nozzle
row are clogged.
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