| 摘要 |
PROBLEM TO BE SOLVED: To enable a system to recover early by speedily and accurately specifying a fault place of plural print substrates connected to a common bus. SOLUTION: A search pattern is generated from PG 20 of PKGs 141, 142... is order and the search pattern is detected by PD 48 of a TSW part 16 through a common bus. At this time, the switch 26 of one PKG is turned OFF and shifted in order and the switches of other PKGs are turned ON. The data output side of the PKG whose switch 26 is turned OFF when a search pattern can be detected is out of order. Further, a search pattern is generated from PG 40 of the TSW part 16 and the search pattern is detected by PD 32 of PKGs 141, 142... through the common bus. At this time, the switch 28 of one PKG is turned OFF and shifted in order and the switches of other PKGs are turned ON. The data input side of the PKG whose switch 28 is turned OFF when the search pattern can be detected by PD 32 of the PKGs 141, 142... is out of order.
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