Epson FX 890 Service Manual - Page 35

Printer fails to operate when power is on., Flowchart 1 - printer troubleshooting

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1. Printer fails to operate when power is on. START FX-1180/FX-880 Service Manual Chapter 3 Troubleshooting Is AC input NO voltage normal? 120V version: 85 - 138V 230V version: 187 - 276V Universal Version: 85 - 276V YES Use the correct AC input voltage. No fluctuation from AC voltage range is permitted. Are the fuses F1 on YES C229PSB/PSE/PSH blown? Replace the fuse. NO Measure the +35V line at pin 7 or 8 of CN2 on C229PSB/PSE/PSH. NO Is output voltage normal? YES Measure the +5V line at pin 3 or 4 of CN2 on C229PSB/PSE/PSH. NO Is the new fuse also blown when power is turned on again? YES Replace the C229 PSB/PSE/PSH. Is output voltage NO normal? YES Verify each motor and printhead solenoid resistance,referring to Table 3-1 and Table 3-2. Are the resistances NO normal? YES Replace the C229MAIN. END Replace the C229 PSB/PSE/PSH. Replace the applied unit. Figure 3-4. Flowchart (1) Rev. B 3-5

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FX-1180/FX-880 Service Manual
Chapter 3 Troubleshooting
Rev. B
3-5
1. Printer fails to operate when power is on.
START
Use the correct AC input voltage.
No fluctuation from AC voltage range is
permitted.
NO
YES
Are the fuses F1 on
C229PSB/PSE/PSH blown?
Replace the fuse.
Is the new fuse also blown when
power is
turned on again?
Measure the +35V line at pin 7
or 8 of CN2 on
C229PSB/PSE/PSH.
Is output voltage
normal?
Replace the C229
PSB/PSE/PSH.
Measure the +5V line at pin 3 or 4
of CN2 on C229PSB/PSE/PSH.
Is output voltage
normal?
Replace the C229
PSB/PSE/PSH.
Verify each motor and printhead
solenoid
resistance,referring to Table 3-1 and Table 3-2.
Are the resistances
normal?
Replace the applied
unit.
Replace the C229MAIN.
END
NO
YES
YES
YES
NO
NO
NO
YES
NO
YES
Is AC input
voltage normal?
120V version: 85 - 138V
230V version: 187 - 276V
Universal Version: 85 - 276V
Figure 3-4. Flowchart (1)