Epson Stylus COLOR 900 Service Manual page 78

EPSON Stylus COLOR 900/900N
Table 3-14. Remedies for a Fatal Error (continued)
Step Problem
6 Is the latch in the Check if the latch
pump/ASF has come loose
switching from the frame.
mechanism loose
Also, check the
or broken?
tension spring.
Has its tension
spring come off?
7 Has a coil in the Measure the internal coil resistance of the pump/ASF
pump/ASF motor motor in the same manner as for the CR motor (see
burned out? Step 4).
Resistance: 7.0
8 Has the ASF Referring to the figure below, measure the coil
solenoid coil resistance of the solenoid using a meter. Note that the
burned out? meter can be used without regard to polarity.
Resistance: 588
Solution
Latch
Ω ±
10%
Ω ±
10%
Table 3-15. Remedies for a Fatal Error (continued)
Step Problem
9 Is the CRHP sensor Turn the printer on and check for the correct voltages
defective? at the 3-pin connector shown in the figure below.
• When the CR is in home position, the voltage
jumps to 2.4 VDC or more.
• When the CR has left home position, the voltage
drops to 0.7 VDC or less.
10 Is the ASF sensor Check for the proper voltage in the same manner as
defective? described in the previous step. The 3-pin ASF
connector's location on the relay board is also shown
in the figure above. The pin configuration is also the
same as the CRHP sensor's.
At power on, the ASF reset operation is performed
and the ASF Sensor detects ASF home position.
Chapter 3 Troubleshooting
Solution
M / C
75