Sony DVP-CX777ES Service Manual page 26

DVP-CX777ES
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 (IC106) are copied
to all areas of RAM (IC404, 405) connected to the AVD
(IC403) 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 (IC106)
are transferred to the RAM (IC404, 405) in AVD (IC403),
and output as video signals from the AVD (IC403).
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
AVD color bar command write t Video (Composite, Y/C)
OUT
Error: Not detected.
The command is transferred to the AVD, and the color bar
signals are output from video terminals.
(7-4) Y/C Out
AVD color bar command write → Video (Composite, Y/C)
OUT
Error: Not detected.
The command is transferred to the AVD, and the color bar
signals are output from video terminals.
They are output from all video terminals (Composite, Y/C,
Component).
(7-5) —————
Check no support.
(7-6) Component Out
AVD color bar command write t Video (Component, Y/
C) OUT
Error: Not detected.
The command is transferred to the AVD, and the color bar
signals are output from video terminals.
(7-7) —————
Check no support.
26
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) Audy
Register check of Audy (IC801) and SDRAM (IC802) check
are performed. After above checks are performed, transit
to the next test tone (8-4).
(8-4) 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, and in the models with
DD output, the test tone is output from L and R of 2-chan-
nel, and all channels of 5.1 output.
After turning on all outputs, each time the
pressed, the output channel is switched for individual chan-
nel checking.
Diagnosis Check Items List
2. Version Display
(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
(3-3) Gate Array Check
(3-4) NAND FLASH Check
(3-5) SACD Check
(3-6) VENC Check
(3-7) ———— (Function not supported)
(3-8) EX RAM Check
4. Servo
(4-2) Servo DSP Check
(4-3) ———— (Function not supported)
(4-4) RF Amp (SSI) W/R 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
(7-4) Y/C Out
(7-5) ———— (Function not supported)
(7-6) Component Out
(7-7) ———— (Function not supported)
8. Audio Output
(8-2) ARP t 1935
(8-3) Audy
(8-4) Test Tone
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