Epson FX 890 Service Manual - Page 32

FX-1180/FX-880 Service Manual, Troubleshooting, Rev. B - specifications

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FX-1180/FX-880 Service Manual Chapter 3 Troubleshooting Part Printhead Table 3-2. Printhead Solenoid Resistance Test Pin Number (See the figure below.) − Common pin :C1 Test pins: 1, 4 − Common pin :C2 Test pin: 8 − Common pin: C3: Test pins: 2, 6 − Common pin: C4: Test pins: 5, 9 − Common pin :C5 Test pins: 3, 7 Test Method (Set Meter to Ohms. Disconnect Motor from Main Board and check it with Printer Power off.) For example, place one lead on pin C1 and the other lead on Test pin 1 to check #1 pin of the Printhead solenoid. Test pin numbers match the printhead solenoid (dot wire) numbers. Specifications 8.19 ± 0.8Ω (at 25°C) Printhead Connenctor Printhead 2C16C2C34 8 C4 C5 975 1 3T T View A A Printhead Connenctor Figure 3-2. Printhead Connector Pin Alignment Transistor Numbers Q2, Q3, Q4, Q5, Q6,Q7, Q8, Q9, Q10 ,Q11,Q12, Q13, Q14, Q15, Q16, Q17, Q18, Q19, Q20 Table 3-3. Printhead Driver Test Pin Test Method (Set meter to diodes. Check power off.) Check the following: − From the base to the collector − From the base to the emitter Reverse the leads and test again. Meter Reading The tester shows neither open nor shorted. Rev. B 3-2

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FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-2
Table 3-2. Printhead Solenoid Resistance
Part
Test Pin Number
(See the figure
below.)
Test Method
(Set Meter to Ohms. Disconnect Motor
from Main Board and check it with
Printer Power off.)
Specifications
Printhead
-
Common pin :C1
Test pins: 1, 4
-
Common pin :C2
Test pin: 8
-
Common pin: C3:
Test pins: 2, 6
-
Common pin: C4:
Test pins: 5, 9
-
Common pin :C5
Test pins: 3, 7
For example, place one lead on pin C1
and the other lead on Test pin 1 to check
#1 pin of the Printhead solenoid. Test pin
numbers match the printhead solenoid
(dot wire) numbers.
8.19
±
0.8
Ω
(at 25
°
C)
A
2
C1
6
C2
C3
4
8
9
C4
7
C5
5
1
3
T
T
View A
Printhead
Printhead Connenctor
Printhead Connenctor
Figure 3-2. Printhead Connector Pin Alignment
Table 3-3. Printhead Driver Test Pin
Transistor Numbers
Test Method
(Set meter to diodes. Check
power off.)
Meter Reading
Q2, Q3, Q4, Q5, Q6,Q7,
Q8, Q9, Q10 ,Q11,Q12,
Q13, Q14, Q15, Q16, Q17,
Q18, Q19, Q20
Check the following:
-
From
the base to the collector
-
From
the base to the emitter
Reverse the leads and test
again.
The tester shows neither open
nor shorted.