Sony DVP NS725P - Progressive-Scan DVD/CD Player, Service Manual

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6-4
6. AV Decoder
(6-2) 1935 RAM
Data write
t
read, and accord check
Error 14: AVD RAM read data discord
The program code data stored in ROM (IC107) are
copied to all areas of RAM (IC404, IC405) connected to
the AVD through the bus, then they are read and checked
if they accord. Further, the same test is conducted once
again with the data where all bits are inverted between 1
and 0. If discord is detected, faulty address, written data,
and read data are displayed following the error code 14,
and the test is suspended.
During the test, OSD display becomes blank as the OSD
area is also checked.
(6-3) 1935 SP
ROM t AVD RAM t Video OUT
Error: Not detected.
The data including sub picture streams in ROM are
transferred to the RAM in AVD, and output as video
signals from the AVD.
Though OSD display becomes blank, the output of video
signals continues until the key is pressed.
7. Video Output
(7-2) Color Bar
AVD color bar command write
t
Video OUT
Error: Not detected.
The command is transferred to the AVD, and the color
bar signals are output from video terminals.
(7-3) Composite Out (European model only)
EURO-AV video output check
AVD color bar command write
t Video (EURO-AV)
OUT
Error: Not detected.
With the component of video output turned off, the color
bar signals are output from the EURO-AV terminal.
This check is performed for European model only.
(7-4) Y/C Out (European model only)
Y/C video output check
AVD color bar command write
t Video (Y/C) OUT
Error: Not detected.
With the Y/C of video output turned on, the color bar
signals are output.
This check is performed for European model only.
(7-5) RGB Out (European model only)
RGB video output check
AVD color bar command write
t Video (RGB) OUT
Error: Not detected.
With the RGB of video output turned on, the color bar
signals are output.
This check is performed for European model only.
(7-6) Component Out (European model only)
Component video output check
AVD color bar command write
t Video (Component)
OUT
Error: Not detected.
With the component of video output turned on, the color
bar signals are output.
This check is performed for European model only.
(7-7) Euro AV Through (European model only)
AV Through output On/Off
Error: Not detected.
AV Through output is turned on.
This check is performed for European model only.
8. Audio Output
(8-2) ARP
t
1935
Data flow from supply system DRAM to SDRAM of AV
Decoder is tested.
Error 15 : ARP
t
1935 video NG
16 : ARP
t
1935 audio NG
(8-3) Test Tone
Pink noise output
Error: not detected
In the models without DD output, the test tone is output
from L and R of 2-channel only.
After turning on all outputs, each time the
>
key is
pressed, the output channel is switched for individual
channel checking.
Diagnosis Check Items List
2. Version
(2-2) Revision
(2-3) ROM Check Sum
(2-4) Model Type
(2-5) Region
(2-6) M’t Check
3. Peripheral
(3-2) EEPROM Check
(3-7) ––––––– (Function not supported)
4. Servo
(4-2) Servo DSP Check
(4-3) –––––––– (Function not supported)
(4-4) RF Amp Register Check
5. Data Supply System
(5-2) ARP Register Check
(5-3) ARP to RAM Data Bus
(5-4) ARP to RAM Address Bus
(5-5) ARP RAM Check
6. AV Decoder
(6-2) 1935 RAM
(6-3) 1935 SP
7. Video Output
(7-2) Color Bar
(7-3) Composite Out (European model only)
(7-4) Y/C Out (European model only)
(7-5) RGB Out (European model only)
(7-6) Component Out (European model only)
(7-7) Euro AV Through (European model only)