Isolating The Faulty Part According To The Phenomenon - Epson Stylus Color C70 Service Manual

EPSON Stylus COLOR C70/C80

3.1.6 Isolating the Faulty Part according to the Phenomenon

Refer to this section if you could not solve the problem in Section 3.1.4 or Section
3.1.5 or need more information to isolate the cause according to the exhibited
phenomenon.
In models which use a DC motor, even if a problem occurs in the printer mechanism,
the motor will keep operating if the current is within the rated level and no problem
will be detected. The result of this is that the motor can keep operating without a fatal
error being detected and without any mechanism problem being detected, so that a
large amount of noise was produced. This section lists surface problems that occurred
during inspections at the prototype stage and which might be considered to occur in the
marketplace also.
Table 3-12. Troubleshooting for surface problems
Step Surface problem
1 [PF Motor Driver Abnormal 1]
PF motor rotary encoder feeds paper at high speed
in an unexpected manner that is different from
normal operation, or paper jams always occur
around the hopper.
2 [ASF Driver Abnormal 1]
The PF motor operates normally, but the ASF is not
being driven. (Paper is not being fed.)
3 [Unexpected Ink Out (Cartridge Out) Error]
Dot dropout appears to be happening a lot, and then
suddenly an Ink Out indication appears. However,
the ink cartridges are almost new or are still quite
full.
4 [PF Motor Driver Abnormal 2]
Noise occurs around the PF motor each time the PF
motor operates.
5 [Carriage Operation Abnormal]
When the power is turned on, the carriage appears
to move slightly, but then a fatal error occurs. (The
fatal error always occurs at the same place.)
Troubleshooting
Reference page
Refer to Section 3.1.6.1.
Refer to Section 3.1.6.2.
Refer to Section 3.1.6.3.
Refer to Section 3.1.6.4.
Refer to Section 3.1.6.5.
Overview
Table 3-12. Troubleshooting for surface problems
Step Surface problem
6 [Dot Missing 1]
The carriage operates normally, but printing is not
possible at all.
7 [Dot Missing 2]
Specific nozzles are always missing or give an
alignment failure even though cleaning is carried
out.
8 [Dot Missing 3]
All nozzles are firing, but printing is unstable.
11 [Repair Handling Failure]
The ROM is to be replaced with a new one, but
immediately after the power is turned on a fatal
error occurs.
12 [ASF Driver Abnormal 2]
The LD roller shaft inside the ASF rotates normally
when the PF motor operates, but the paper cannot be
fed properly, or a large amount of noise is heard.
13 [CR Motor Operation Abnormal]
A printer which has performed well up until a
certain time suddenly changes in printing speed so
that printing time becomes much longer.
Revision A
Reference page
Refer to Section 3.1.6.6.
Refer to Section 3.1.6.7.
Refer to Section 3.1.6.8.
Refer to Section 3.1.6.9.
Refer to Section 3.1.6.10.
Refer to Section 3.1.6.11.
82