Epson 890N Service Manual - Page 61

EPSON FX-890/2190 3.2.9 Abnormal operation of Carriage Unit Table 3-11. Abnormal operation of Carriage Unit Step Action and Question Yes No Parts below can be the source of this error (Chapter 4 Disassembly and Assembly) • Timing Belt • CR Motor (p.81) • HP (Home Position) Detector (p.78) • Harness of HP Detector • Ribbon Drive (RD) Assembly (p.92) • C524MAIN Board (p.74) Checking the connection of connectors Make sure that the following connectors are connected properly. 1 • HP Detector (CN8) • CR Motor (CN12) Problem solved Go to Step 2 ♦Is the problem solved? Timing Belt Check to see if the driving path of the Timing Belt 2 is obstructed with foreign matters or the belt is damaged. Go to Step 3 Replace the Timing Belt. ♦Is the Timing Belt free from obstruction or damage? Ribbon Drive Assembly 3 Operate the Timing Belt by hand and check the movement. ♦Does the Timing Belt operate smoothly? Go to Step 4 Replace or lubricant the Ribbon Drive Assembly. Checking the operation of the Carriage Unit 4 Check to see if you can move the Carriage Unit on Refer to the SHAFT,CR,GUIDE from side to side by hand. Go to Step 5 Lubrication (p.100) ♦Does the Carriage Unit operate smoothly? Defective HP Detector 5 Replace the HP Detector with a new one. ♦Is the problem solved? Replace the HP Detector. Go to Step 6 Revision B Table 3-11. Abnormal operation of Carriage Unit (continued) Step Action and Question Yes No Defective harness of HP Detector Replace the 6 Replace the harness of the HP Detector with a new harness of one. the HP Go to Step 7 ♦Is the problem solved? Detector. Defective CR Motor 7 Replace the CR Motor with a new one. ♦Is the problem solved? Replace the CR Motor. Go to Step 8 Main Board 8 Replace the Main Board with a new one. ♦Is the problem solved? Replace the Main Board. Go to 3.2.11 Electrical Noise (p.62) Troubleshooting Troubleshooting Based on Symptoms 61