Communication Error; Too Late Throughput - Epson Stylus Color C70 Service Manual

EPSON Stylus COLOR C70/C80

3.1.1 Communication Error

This section describes the procedures for solving the problem when no communication
at all is received from the computer after the printer power has been turned on, even
when initialization has completed normally and the printer is at the standby condition.
Table 3-1. Communication Error Checking Point
Step Check Point
1 Is the customer's If communication is possible at all times while working, proceed
I/F cable broken? to the next step. If communication is not possible, change the
interface from parallel to USB or vice versa and check if
communication is then possible. If there is still no
communication, continue to the next step.
2 Use the The relationship between the interface protocol setting status and
the setting values is given below.
adjustment
program to check
00H: Auto (Default value; communication problems should
the 60H address never occur with this setting.)
(interface
01H: Fixed to Parallel (Communication problems occur when
protocol setting)
using USB)
for the EEPROM.
02H: Fixed to USB (Communication problems occur when
using parallel)
To reset, use the Dump function of the adjustment software to
rewrite the setting to the default (00H). The relationship between
the interface protocol setting status and the setting values is given
below. For details, refer to Chapter 5.
NOTE:The Stylus COLOR C80 has a default setting function, but
unlike previous models, interface protocol selection is not
possible. Furthermore, the Stylus COLOR C70 does not
have its own default setting function. Even if the default
value (00H) is changed to 01H or 02H, the EEPROM
data may become corrupted, so even if the
communication problem is fixed, there is a high
possibility that the various adjustment values may be
distorted. Because of this, all parameter electrical
adjustments should be carried out afresh. Refer to
Chapter 5 for details.
3 EPSON USB Port If no problems occur when the above two checks are carried out,
check with the customer whether the USB port has been installed
(Only for USB
correctly or not, and if necessary get the customer to reinstall the
User)
driver and re-check. (However, this is only for customers who are
using USB.)
Troubleshooting
Remedy
Overview

3.1.2 Too Late Throughput

This section describes the procedures for checking printers that have been returned
because the printing speed suddenly became much slower after having operated
normally up until then. Basically this problem is unlikely to occur in Windows and
Macintosh environments because the printer driver is used to transmit data and
commands, but it is possible that customers using the printer in a DOS environment
may experience this problem.
Table 3-2. Too Late Throughput
Step Check Point
1 Use the adjustment The relationship between the setting status and the
program to check the setting values is given below.
50H address for the
00H: Bi-D
EEPROM.
01H: Uni-D
02H: Auto
To reset, use the Dump function of the adjustment
software to rewrite the setting to the default (02H).
The relationship between the interface protocol
setting status and the setting values is given below.
00H: Auto (Default value; communication
01H: Fixed to Parallel (Communication problems
02H: Fixed to USB (Communication problems
To reset, use the Dump function of the adjustment
software to rewrite the setting to the default (00H).
Refer to Chapter 5 for details.
NOTE:The Stylus COLOR C80 has a default setting
NOTE: If the problem does not disappear or if it cannot be reproduced when
these checks are carried out, refer to "CR Motor Operation Abnormal" in
Section 3.1.6.11.
Revision A
Remedy
problems should never occur with this
setting.)
occur when using USB)
occur when using parallel)
function, and it can be used for setting this
item also, so that the setting can be returned
to the default without using the adjustment
software.
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