Dsp Trouble Shooting - Pioneer XV-DV740 Service Manual

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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)– µ-com (PinNo.80 DIRDO).
→Communication fault has occurred somewhere between the µ- 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)–µ-com (PinNo.50 DSPDO).
→Communication fault has occurred somewhere between the µ-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)–µ-com (PinNo.82 DSPHREQ).
→Communication fault has occurred somewhere between the µ-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 µ-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)–µ-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)–µ-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 µ-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 µ-com has not received data from the CODEC IC, it cannot detect the fault and display the error information.
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6
D I R E R R - U M
FL
D S P E R R - U M
FL
H R E Q - U M
FL
D S P N G -
FL
D M U T E
FL
D S P
FL
FL D S P
D S P
FL
XV-DV740
6
7
* "U", "M" display below is a sample.
Those character display ON/OFF depends on the state.
U M
- M
O K - U M
O K - M
O K - 9
7
8
A
B
C
D
E
F
99
8