Epson LQ-570e - Page 59

EPSON LQ-570e/LQ-580 Revision C
T
roubleshooting
O
verview
5
9
Figure 3-2. Printhead Connector Pin Alignment
Table 3-2. Printhead Coil Resistance Test Points
Common
Pin No.
Test Pin No.
Test Method
(Set meter to ohms. Disconnect the
printhead after the printer is powered off.)
Meter
Reading
Refer to the
figure below.
Refer to the
figure below.
Place one lead on each pin and the other lead
on each common pin.
29.6±3.0Ω
(at 25°C, 77°F)
Table 3-3. Printhead Driver Test Pin
Transistor Numbers
Test Method
(Set meter to diodes. Check with
printer 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.
3
15
C5
2C6
5
16 11
C7
17
C8 14 4 8
1
913
7
C1
18 C2
12
C3
C4
610
TT
XX
X
X
XX
R
F
R
F
F
COM. C1 C2 C3 C4
1.7.13 9 10.18 6.12
R
COM. C5 C6 C7 C8
2.5.11 3.15 16.17 4.8.14
Pin No, Pin No,
T : Thermistor terminal
X : Not used
Table 3-4. Detector Test Point
Detector Connector
Number
Test Method
(Set meter to ohms. Check with
printer power off.)
Meter Reading
HP Detector (CN4)
Place one lead on pin 1 and the other
lead on pin 2, and toggle the detector
actuator.
Meter should toggle between
open and short. (LOW:
within CR Home position.)
Front PE (FPE)
Detector (CN6)
Place one lead on pin 1 and the other
lead on pin 2, and toggle the detector
actuator.
Meter should toggle between
open and short. (HIGH:
paper is installed in the
printer.)
Rear PE (RPE)
Detector (CN7)
Place one lead on pin 1 and the other
lead on pin 2, and toggle the detector
actuator.
Meter should toggle between
open and short. (HIGH:
paper is installed in the
printer.)
Release Lever Detector
(CN5)
Place one lead on pin 1 and the other
lead on pin 2, and toggle the detector
actuator.
Meter should toggle between
open and short. (HIGH:
Friction Feed mode.)
PG Detector (CN8)
Place one lead on pin 1 and the other
lead on pin 2, and move the detector
actuator from -0 to 6.
Meter should toggle between
open and short. (HIGH: PG -
1 ~ 3.)
Printhead thermistor
Place one lead on pin T and the other
lead on other pin T to check the
resistance.(Refer to Fig.3-2.)
Approx. 14KΩ (at 17°C)