DFX-8500
Table
Symptom | Cause | Checkpoint | Solution |
A particular dot | The printhead is | Measure the printhead coil resistance. | Replace the |
does not print. | defective. | (Refer to Figure | printhead. |
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| Check whether a dot wire is worn. | Replace the |
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| printhead. |
The print is too | The printhead is | Check if the tip of a dot wire is worn. | Replace the |
light or print | defective. |
| printhead. |
density is not |
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uniform. |
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| The parallelism value | Print density differs at the right and left | Perform the |
| is incorrect. | sides of the page (darker on one side | parallelism |
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| than the other). | adjustment, as |
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| described in Section |
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| 4.1.5. |
| The platen gap value | Print density is too light even the new | Perform the |
| is incorrect. | ribbon cartridge is mounted. | parallelism |
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|
| adjustment, as |
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| described in Section |
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| 4.1.5. |
Printing is | Foreign objects are | Visually check the paper path. | Remove any foreign |
performed, but the | lodged in the paper |
| substances. |
printer does not | path. |
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feed paper or |
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does not feed it |
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correctly. |
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| The PF motor is not | Check whether the PF motor pinion | Check backlash |
| driving the gear | gear rotates smoothly when rotated | between PF motor |
| properly. | manually | pinion gear and |
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| paper feed reduction |
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| gear. |
| The PF motor is | Measure coil resistance for the PF | Replace the PF |
| defective. | motor. (The correct resistance is | motor, and if drivers |
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| approximately 2.8 ohms + 10%.) Also | are bad, replace |
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| check the PF motor drivers. | main board at the |
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| same time |
The ribbon feed | The ribbon cartridge | Remove the ribbon cartridge, rotate it, | Replace the ribbon |
(RF) motor does | is defective. | and check whether it feeds the ribbon | cartridge. |
not operate. |
| normally. |
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| Foreign objects are | Check whether the ribbon driving gear | Remove any foreign |
| caught in the gears. | rotates when the cartridge is moved | objects or replace |
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| manually. | damaged ribbon |
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| feed mechanism |
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| part (the ribbon feed |
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| select gear, ribbon |
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| feed transmission |
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| gear, or ribbon feed |
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| gear). |
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| .. |
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Rev. B |
