Sony dvp-s3000 Service Manual page 38

IC093 (ROM) n IC216 (CXD1186) n IC217 (CXD8598R) n
IC380 (CXD8603R) SRAM read collating check
The bit stream data of MPEG-AUDIO stored in IC093 (ROM) are
transferred by only one sector to the IC215 (external SRAM of
IC216), then they are flown to the IC380 (CXD8603R) via IC217
(CXD8598R).
If no error is found, the data are transferred to the SRAM in IC380
(CXD8603R) and compared with original ROM data.
The first 512 bytes in code buffer are read from IC380 (CXD8603R)
SRAM into internal RAM of CPU, and whether 256 byte pattern
after 12th bytes in effective area of MPEG-AUDIO bit stream data
stored in ROM is contained is searched. If not found, the pattern to
be searched is shifted one byte each, and a searching is repeated
maximum 256 times. The check passed if 256 bytes are same suc-
cessively.
If same pattern is not found, the error code 10 is output.
(9-6) Audio decoder boot check
AC-3 codes are downloaded to the audio decoder.
The error code 50 if download is not terminated successfully, or
error code 51 if AC-3 codes downloading failed is output.
When an error occurred here, the subsequent audio related diagno-
sis may be rejected, resulting in unconditional output of error code
50.
(9-7) IC380 (CXD8603R) interrupt line check
IC093 (ROM) n IC181 (CXD8663Q) n IC217 (CXD8598R) n
IC380 (CXD8603R)
The bit stream data including Navi Pack stored in IC093 (ROM)
are transferred to the DRAM of IC181 (CXD8663Q). Then, the
Navi Ready interruption is checked, which occurs by flowing the
data to the IC380 (CXD8603R) via IC217 (CXD8598R).
The error code 55 is output when an interruption cannot be con-
firmed though 2 seconds elapsed after data transfer request was
sent to the IC181 (CXD8663Q).
As SERR signal from IC181 (CXD8663Q) to IC217 (CXD8598R)
is not initialized, this signal line is shut off and fixed to "high" be-
fore checking.
When an error occurred, confirm (5-8) IC181 (CXD8663Q) to IC217
(CXD8598R) connection check.
(9-8) DREQ/NCST check
IC093 (ROM) n IC181 (CXD8663Q) n IC217 (CXD8598R) n
IC380 (CXD8603R) read data pattern check
The bit stream data including Navi Pack stored in IC093 (ROM)
are transferred to the DRAM of IC181 (CXD8663Q). Then, the
data are flown to the IC380 (CXD8603R) via IC217 (CXD8598R).
The error code 55 is output when Navi Ready interruption cannot
be confirmed though 2 seconds elapsed after data transfer request
was sent to the IC181 (CXD8663Q).
As SERR signal from IC181 (CXD8663Q) to IC217 (CXD8598R)
is not initialized, this signal line is shut off and fixed to "high" be-
fore checking.
When an error occurred, confirm (5-8) IC181 (CXD8663Q) to IC217
(CXD8598R) connection check.
If no error is found, the Navi Pack transferred to the SRAM in IC380
(CXD8603R) is read for checking.
The error code 10 is output if the data are not same as original bit
stream data.
(9-9) MPEG audio digital output check
IC093 (ROM) n IC216 (CXD1186) n IC217 (CXD8598R) n
IC380 (CXD8603R) n Digital Audio I/F audio signal output
The bit stream data of MPEG-Audio stored in IC093 (ROM) are
transferred to the IC216 (CXD1186). Then, the data are flown to
the Digital Audio Interface via IC217 (CXD8598R) and CK to re-
generate audio signals.
For the data, audio frequencies are different between left and right
channels. Using left and right channels mixing function, the same
stream is checked three times in the order of left channel, right chan-
nel, and both channels on.
In this diagnosis, the kind of expected errors is many because of
complicated paths, but the diagnosis is finished upon detection of
an error.
Confirm the content of error from the error code list.
If no error is detected, a sound is generated three times, then a mes-
sage is output and the controller waits for key entry.
(9-10) MPEG audio analog output check
IC093 (ROM) n IC216 (CXD1186) n IC217 (CXD8598R) n
CK n Analog Audio I/F audio signal output
The bit stream data of MPEG-Audio stored in IC093 (ROM) are
transferred to the IC216 (CXD1186). Then, the data are flown to
the Analog Audio Interface via IC217 (CXD8598R) and CK to re-
generate audio signals.
For the data, audio frequencies are different between left and right
channels. Using left and right channels mixing function, the same
stream is checked three times in the order of left channel, right chan-
nel, and both channels on.
In this diagnosis, the kind of expected errors is many because of
complicated paths, but the diagnosis is finished upon detection of
an error.
Confirm the content of error from the error code list.
If no error is detected, a sound is generated three times, then a mes-
sage is output and the controller waits for key entry.
(9-11) Audio attenuator check
IC093 (ROM) n IC216 (CXD1186) n IC217 (CXD8598R) n
IC380 (CXD8603R) n Analog Audio I/F audio signal output
The bit stream data of MPEG-Audio stored in IC093 (ROM) are
transferred to the IC216 (CXD1186). Then, the data are flown to
the Analog Audio Interface via IC217 (CXD8598R) and IC380
(CXD8603R) to regenerate audio signals.
In such a case, DAC attenuation value is set to 1/4 of normal value
to lower the volume.
For the data, audio frequencies are different between left and right
channels. Using left and right channels mixing function, the same
stream is checked three times in the order of left channel, right chan-
nel, and both channels on.
In this diagnosis, the kind of expected errors is many because of
complicated paths, but the diagnosis is finished upon detection of
an error.
Confirm the content of error from the error code list.
If no error is detected, a sound is generated three times, then a mes-
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