Sony DVP-S7700 Service Manual page 85

(8) Video Consumption Concerned
(8-2) Video Encoder (Serial) (IC252)
Color bar output (color bar enable command) from Video Encoder
(IC252)
Error 11: Serial transfer error
Using the Vsync interruption, serial communication to the Video
Encoder (IC252) starts, and the color bar enable command is trans-
ferred to the Video Encoder (IC252).
The Vsync interruption and internal serial 1 interruption are used.
If no error is found, the message is displayed to prompt for key
entry.
Check the color bar output.
(8-3) Video Encoder (IC252) Read
ID read → Existing data matching check
Error 40: Video Encoder (IC252) ID error
The Video Encoder (IC252) device ID is read.
Error if the read value is not "1914 (hex)".
(8-4) Video Encoder (IC252) Vsync
CPU measures the Video Encoder (IC252) Vsync interrupt cycle.
Error 41: Vsync interruption is not detected
42: Vsync interrupt cycle error
The number of interruption for 200 msec is counted, and if it is 11
to 13 times, this check is OK. It should be 12 times exactly, but ±1
errors are allowable.
(8-5) Still Picture Output (SDRAM (IC201, 202) direct write)
Pattern data → AV Decoder (IC203) → Video Out
Error 31: AV Decoder (IC203) interruption (DMA transfer) is not
detected
The pattern is directly written to the SDRAM (IC201, 202) of AV
Decoder (IC203), then its picture display is checked.
First, the brightness signal data are written by the amount of one
screen while changing every pixel.
For the color difference signals, both Cr and Cb are set to 80h for
monochromic pictures, and the display is turned on.
Then, color difference signal data are written while changing the
data every column.
As both brightness signal data and color difference signal data
take regular patterns, the processing speed is increased through
DMA transfer of the repeated sections.
Further, in detail check the color difference signal data written to
the out of display area are copied through DAM transfer to change
display colors successively.
If no error is found, the message is displayed to prompt for key
entry.
Check the pattern output.
(8-6) Still Picture Output (via ARP (IC806))
ROM picture data → ARP (IC806) → AV Decoder (IC203) →
Video Out
Error 10: Chip-to-chip data transfer error
ROM (IC803) data are transferred to the AV Decoder (IC203) via
ARP (IC806), and the displayed picture is checked.
If no error is found, the message is displayed to prompt for key
entry.
The output picture is same as the start-up picture.
(8-7) DNR (Serial) (IC251)
ROM picture data → ARP (IC806) → AV Decoder (IC203) →
DNR (IC251) → Video Out (outline)
Error 10: Chip-to-chip data transfer error
Using special diagnostic command, the output still picture is trans-
ferred to the DNR (IC251) for checking.
If no error is found, the message is displayed to prompt for key
entry.
This checking is made only for the players with DNR (IC251).
The output picture used is same as that in (8-6) Still Picture Out-
put.
The colors will vary extremely, if DNR (IC251) is effective.
For the players without DNR (IC251), the error code 0 is returned.
(8-8) S Terminal DC Check
Color bar output by NTSC Encoder in Video Encoder (IC252)
Error 11: Serial transfer error
The color bars are output in the same manner as in (8-2).
After VS signal is turned on/off repeatedly two times, the color
bar output is turned off.
(8-9) EURO-AV Output Check (AEP, UK model)
Color bar output by video encoder (IC252)
ROM audio data → ARP (IC806) → AV Decoder (IC203) → 2ch
DAC (IC215) → Analog Audio Out
Error 11: Serial transfer error
10: ARP (IC806) n AV decoder (IC203) transfer error
35: 2ch DAC (IC215) serial transfer interruption is not de-
tected
37: PLL DAC (IC209) serial transfer interruption is not de-
tected
With AV-CONT: "H", E-V/Y: "H", E-V/RGB: "H", video and au-
dio signals are output.
For the video signals, the color bars are output same as in (8-2).
For the audio signals, MPEG audio signals of ROM (IC803) data
are output same as in (9-7).
6-5