Pioneer DEQ-P9 Service Manual - Page 41

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7.3 OPERATIONAL DESCRIPTION

The DSP/DIR/DF/EVOL will be initialized, and the microcomputer will enter a normal operation. All other commands

entered by key operations are also received by IP-BUS communications, and DSP/EVOL settings are conducted. For

normal operations, the monitoring of the DSP error is conducted by communicating with the DSP at certain intervals.

When DSPPW does not become H

The XOUT(Pin10)/XIN(Pin12) of the microcomputer is not operating.

The microcomputer is in the STOP mode. Please verify the ASENSB

(Pin16)/BSENS(Pin15).

Lock and Unlock of the DIR (DIRERR(Pin72) of the microcomputer)

Fixed to HIGH

Either the digital audio is abnormal, or the DIR IC is abnormal.

Becomes HIGH at certain intervals

When a DIR error or DSP error is detected, the microcomputer performs re-initialization.

In such circumstances, the DIRRST(Pin68)/DSPRST(Pin67) become LOW (for 4ms) at certain intervals (approximately 3

sec.).

The microcomputer is performing re-initialization.

DEQ-P9

With the IP-BUS communica-

tions, communication is con-

ducted in set intervals (a

refresh operation is conduct-

ed every five seconds), when

the Acc and Bup are ON (see

figure on the left).

When the IP-BUS communi-

cations are not performing

properly, the product does

not operate properly.