Diagnostic Procedures When Aac Decoding Has Failed - Pioneer DVR-LX61D Service Manual

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6.11 DIAGNOSTIC PROCEDURES WHEN AAC DECODING HAS FAILED

[1] AAC information
[Purpose]
AAC Error Information
[How to Enter]
Press [ESC], [DISP], [+10], then [1], in that order. The first screen is displayed.
To switch screens, press [DIG/ANA].
First screen
(Note 1)
Note 1: Startup status (OK/NG) of the external decoder
If the external decoder starts up normally, OK is displayed. If it fails to start up, NG is displayed. With NG, playback of any AAC
file will fail.
Possible causes for failure of startup and how to diagnose
Possible cause 1: No reset signal is input to IC101.
How to diagnose: Check whether a high signal is input to Pin AAC_RESET_B of IC101.
Possible cause 2: Communication failure between IC101 and IC1001 on the MAIN ASSY.
How to diagnose: Check whether high and low signals are alternately input to Pins AAC_D0 to AAC_D15, AAC_A0 to
AAC_A10, AAC_RD_B, AAC_WR_B, and AAC_CS_B for communication.
Possible cause 3: Failure in IC101
How to diagnose: Check whether a low signal is output from Pin AAC_INT_B in response to the reply from IC101
Possible cause 4: Failure in IC101 that cannot be diagnosed
The flow of startup processes is as follows:
(1) A high signal is input to Pin AAC_RESET_B.
(2) Communication starts, using Pins AAC_D0 to AAC_D15, AAC_A0 to AAC_A10, AAC_RD_B, AAC_WR_B, and
AAC_CS_B.
(3) In response to the process in step (2) above, a low signal is output from Pin AAC_INT_B.
(4) Steps (2) and (3) are repeated until the startup process is completed.
Second screen: Information on playback of MUSIC files
(Note 2)
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