Sony DVP-K370 Service Manual page 74

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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 (IC504, IC505) connected to the AVD
through the bus, then they are read and checked if they ac-
cord. Further, the same test is conducted once again with
the data where all bits are inverted between 1 and 0. If dis-
cord 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 trans-
ferred 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.
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8. Audio Output
(8-2) ARP t1935
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, 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 [NEXT] key is
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
(3-7) ———— (Function not supported)
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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\
8. Audio Output
(8-2) ARP t1935
(8-3) Test Tone
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