Epson FX-880 Service Manual page 32

Part Test Pin
Number
(See the figure
berlow.)
Printhead Common pin C1 :
Test pin 1, 4
Common pin C2 :
Test pin 8
Common pin C3 :
Test pin 2, 6
Common pin C4 :
Test pin 5, 9
Common pin C5 :
Test pin 3, 7
Transistor Numbers
Q2, Q3, Q4, Q5, Q6,Q7, Q8,
Q9, Q10
Q11,Q12, Q13, Q14, Q15,
Q16, Q17, Q18, Q19, Q20
Rev. A
Table 3-2. Printhead Solenoid Resistance
(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
Printhead solenoid. The test pin number is
just match with the printhead solenoid (dot
wire) number.
Figure 3-2. Printhead Connector Pin Alignment
Table 3-3. Printhead Driver Test Pint
Test Method
(Set meter to diodes. Check
power off.)
Check from base to collector,
and check from base to
emitter. Reverse leads and test
again.
Test Method
FX-880 Service Manual
Chapter 3 Troubleshooting
Specifications
8.19 0.8 (at 25 C)
Meter Reading
Not open and not shorted from
base to collector, base to
emitter.
3-2