HP 1220c Support Guide - Page 135

START Self-Test patterns appear No on paper? Yes Self-Test looks OK? Clean print No Cartridges and reprint Self-Test. Yes Self-Test looks OK? No Clean electrical contacts and perform Nozzle Pattern Diagnostic test. Protective tape on the print cartridge? Remove protective Yes tape and reprint Self-Test. No Out of ink? Yes Change print cartridges. No Reprint Self-Test. Self-Test looks OK? Yes No Replace Logic PCA. Gaps in test pattern? Perform Pen Yes Recovery Diagnostic test. Pen recovery successful? Yes No Change print cartridges and reprint Nozzle Pattern Diagnostic test. No Yes Gaps in test pattern? Carriage PCA, Yes Flex Cable or Logic PCA faulty. No Print Self-Test page. Self-Test looks OK? Service Station or No Carriage PCA faulty. Replace one at a time to isolate problem. Yes STOP