Pioneer HD-V9000 Service Manual page 33

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Order of priority
The priority is classified from A to D (shown in the Priority column of the Error List sheet).
A: Most serious errors (level where the hardware may be damaged)
B: Serious errors (level where operations may be disrupted)
C: Normal errors (Warning level)
D: Normal errors (Caution level)
The suffix numbers, such as those in B1 and B2, denote priority of the same level.
• If another error of higher priority occurs while an error indication is displayed, the message will be overwritten.
Another error of lower priority that occurs while an error indication is displayed will be disregarded.
• For errors of the same priority, the later one will take precedence (overwriting the former message).
• Any display request other than that for an error will be disregarded (assigning priority to errors).
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