Lexmark C510 Service Manual - Page 109
-Magenta developer clutch service check, Remove I/O board shield.
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5021-0XX 902-Magenta developer clutch service check Step Questions / actions Yes No 1 Turn printer off and remove Go to step 2. right cover. See "Right cover removal" on page 4-22. Is developer clutch cable properly connected? Properly connect cable. Go to step 5. 2 Is developer clutch cable damaged? Replace developer drive assembly. See "Developer drive assembly removal" on page 4-32. Go to step 3. 3 Disconnect clutch cable. On clutch side, measure resistance between two outer pins. Is resistance between 139 and 171 ohms? Go to step 4. Replace developer drive assembly. See "Developer drive assembly removal" on page 4-32. 4 Remove I/O board shield. Replace I/O Replace cable. See "I/O board removal" board. See"I/O Go to step 5. on page 4-70 for steps to board removal" remove I/O board shield. on page 4-70. Disconnect cable from Go to step 5. DCN10 on I/O board. Check cable continuity from DCN10 pins 19 and 20 to connector that attaches to magenta developer clutch cable. Ensure that pins are not shorted. Is cable okay? Diagnostic information 2-31