Pioneer XV-DV440 Service Manual Download

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XV-DV740

7.1.10 DSP TROUBLE SHOOTING

Detectable DSP Errors

The following conditions are assumed,
in order to eliminate causes other than "DSP-assy" and "between DSP-assy and microcomputers".
• Electric power is correctly supplied to DSP-assy.
• The SPDIF signal is coming to the input port of DIR ("COAX IN" RX0 & "OPT IN" RX3 & "DVD" RX7).
• There is no audio output from DSP-assy, or audio output is unusual.
Check the signal route by referring the connection diagram between U-com and DSP module IC (next page).

• ERR_0 : –Cannot receive data from DIR–

→

Communication fault has occurred somewhere between DIR (PinNo.32 CDTO)–Level Shifter (IC8702)–

-com (PinNo.80 DIRDO).

→

Communication fault has occurred somewhere between the

- com-port (*1) which has sent the signal and each IC.

• ERR_1 : –Cannot receive data from DSP–

→

Communication fault has occurred somewhere between DSP (PinNo.144 DSDO)–Level Shifter (IC8702)–

-com (PinNo.50 DSPDO).

→

Communication fault has occurred somewhere between the

-com-port (*1) which has sent the signal and each IC.

→

Communication fault has occurred somewhere between the DIR and DSP.

• ERR_2 : –There is no return value of HREQ.–

→

Communication fault has occurred somewhere between DSP (PinNo.3 HREQ)–Level Shifter (IC8702)–

-com (PinNo.82 DSPHREQ).

→

Communication fault has occurred somewhere between the

-com-port (*1) which has sent the signal and each IC.

→

Communication fault has occurred somewhere between the DIR and DSP.

• ERR_3 : –ERR information from DSP–

→

Communication fault has occurred somewhere between the

-com-port (*1) which has sent the signal and each IC.

(especially the fault inside DSP)

→

Communication fault has occurred somewhere between the DIR and DSP.

• ERR_4 : –DECOMUTE continues being LOW(MUTE).–

→

Communication fault has occurred somewhere between DSP (PinNo.21 PB12)–Level Shifter (IC8702)–

-com (PinNo.86 DECMUTE).

→

Communication fault has occurred somewhere between the É com-port (*1) which has sent the signal and each IC.

→

Communication fault has occurred somewhere between the DIR and DSP.

Although the following are not errors, they are displayed separately and are helpful in finding a solution.

• INFO_0 : –DIRERR is HIGH (UNLOCK) in digital function.–

If DIRERR continues being HIGH (UNLOCK) without the above-mentioned error display.

→

Communication fault has occurred in somewhere between DIR (PinNo.36 INT0)–Level Shifter (IC8702)–

-com (PinNo.77 DIRERR).

→

Check that the external set and this model is properly connected by the digital cable when selecting LINE2 (External Digital) function.

• INFO_1 : –DSPMUTE is LOW (MUTE).–

If DSPMUTE continues being LOW (MUTE) without the above-mentioned error display.

→

Communication fault has occurred somewhere between

-com (PinNo.86 DSPMUTE)–connector (CN8011 and CN8012 No.19 MUTEOUT).

• INFO_2 : –Loading 88.2kHz/96kHz PCM–

DSP function is limited when this information is displayed.

Notes :
Only the high priority error (near to ERR_0) is displayed when the multiplel errors have occurred.

When the analog audio output of a DSP module is unusual but the above error information is not displayed, the fault is probably in the
CODEC IC (IC8401) and the peripheral circuits.
As the

-com has not received data from the CODEC IC, it cannot detect the fault and display the error information.

D I R E R R - U M

D S P E R R - U M

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