Epson C117001-N Product Support Bulletin(s) - Page 1

Epson C117001-N - DFX 5000+ B/W Dot-matrix Printer Manual

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EPSON AMERICA, INC. Product Support Bulletin Subject: DFX-5000 paper loading problems. Date: 01/04/94 Page(s): 1 of 2 PSB No: P-0102 Originator: SEK EPSON The purpose of this bulletin is to resolve a problem with the DFX-5000 printers that constantly or intermittently perform a load and eject cycle or fail to load paper completely. 1. Problem: The initial and final platen gap values cannot be determined as read from the platen gap sensor. 2. Explanation: There are two possible solutions to this problem. The fix that has been used in the past with moderate success is to gap the platen gap motor with a thin strip of regular copy paper. The platen gap motor (PGM) was set for zero backlash from the factory, and as the unit ages, it is increasingly difficult for the carriage guide shaft (CGS) to rotate and find the initial and final platen gap (PG) values. The printer would load and eject paper constantly and on rare occasion, the paper would stay loaded. If the PGM backlash adjustment does not cure the problem, there are two friction clutches that keep the CGS from rotating while printing. On older units, or units used in harsher environments, the lubricant on the friction plates will dry out or get contaminated causing sluggish response of the CGS. The CGS will seem like it is harder to turn than other printers, although the amount is very slight and is difficult to measure. 3. Resolution: On each side of the CGS there is a friction clutch (Figure 1, Reference 561, 562, 563 and 614). These clutch plates must be removed, cleaned, lubricated and reinstalled. This is the procedure: 1. Remove the interlock switch before lifting the mechanism out. 2. Remove the four screws that hold the mechanism in the printer, all cables and ground straps. 3. Remove the junction board, the PG sensor and the PG motor. 4. Remove the E ring that holds the CGS gear and the other small gear. 5. Remove the E ring (563) and spring (614) that attaches the "Guide shaft holding lever" or clutch plate.

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EPSON AMERICA, INC.
EPSON
Product Support Bulletin
Subject: DFX-5000 paper loading problems.
Date: 01/04/94
Page(s): 1 of 2
PSB No: P-0102
Originator: SEK
The purpose of this bulletin is to resolve a problem with the DFX-5000 printers that
constantly or intermittently perform a load and eject cycle or fail to load paper
completely.
1. Problem:
The initial and final platen gap values cannot be determined as read from the platen
gap sensor.
2. Explanation:
There are two possible solutions to this problem. The fix that has been used in the past
with moderate success is to gap the platen gap motor with a thin strip of regular copy
paper. The platen gap motor (PGM) was set for zero backlash from the factory, and as
the unit ages, it is increasingly difficult for the carriage guide shaft (CGS) to rotate and
find the initial and final platen gap (PG) values. The printer would load and eject paper
constantly and on rare occasion, the paper would stay loaded.
If the PGM backlash adjustment does not cure the problem, there are two friction
clutches that keep the CGS from rotating while printing. On older units, or units used in
harsher environments, the lubricant on the friction plates will dry out or get
contaminated causing sluggish response of the CGS. The CGS will seem like it is
harder to turn than other printers, although the amount is very slight and is difficult to
measure.
3. Resolution:
On each side of the CGS there is a friction clutch (Figure 1, Reference 561, 562, 563
and 614). These clutch plates must be removed, cleaned, lubricated and reinstalled.
This is the procedure:
1.
Remove the interlock switch before lifting the mechanism out.
2.
Remove the four screws that hold the mechanism in the printer, all cables and
ground straps.
3.
Remove the junction board, the PG sensor and the PG motor.
4.
Remove the E ring that holds the CGS gear and the other small gear.
5.
Remove the E ring (563) and spring (614) that attaches the “Guide shaft holding
lever” or clutch plate.