Service manual

Troubleshooting
5-4
EPSON FX-880/FX-1180 Service Manual
Printhead
You can check for an open circuit in the printhead’s solenoid coils by using a multimeter and the table
below. Note that the test pin numbers shown in Figure 5-2 match the individual printhead solenoids (dot
wires).
Remove the printhead by following the instructions in Chapter 3. Be sure to perform the platen gap
adjustment after replacing or re-installing the printhead.
Table 5-6. Printhead Solenoid Resistance Test Points
Common Pin
Number
Test Pin Number Test Method Specifications
C1 1, 4 Place one lead on pin C1 and the other
pin on pin 1 to test solenoid 1.
Place one lead on pin C1 and the other
lead on pin 4 to test solenoid 4.
8.19 ± 0.8 Ω
at 77° F (25° C)
C2 8 Place one lead on pin C2 and the other
pin on pin 8 to test solenoid 8.
8.19 ± 0.8 Ω
at 77° F (25° C)
C3 2, 6 Place one lead on pin C3 and the other
pin on pin 2 to test solenoid 2.
Place one lead on pin C3 and the other
lead on pin 6 to test solenoid 6.
8.19 ± 0.8 Ω
at 77° F (25° C)
C4 5, 9 Place one lead on pin C4 and the other
pin on pin 5 to test solenoid 5.
Place one lead on pin C4 and the other
lead on pin 9 to test solenoid 9.
8.19 ± 0.8 Ω
at 77° F (25° C)
C5 3, 7 Place one lead on pin C5 and the other
pin on pin 3 to test solenoid 3.
Place one lead on pin C5 and the other
lead on pin 7 to test solenoid 7.
8.19 ± 0.8 Ω
at 77° F (25° C)
Figure 5-2. Printhead Connector Pin Alignment
A
2
C1
6
C2
C3
4
8
9
C4
7
C5
5
1
3
T
T
View A
Printhead
Printhead Connector
Printhead Connector