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Sony DVP-NS305 Service Manual Page 69

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(3-6) Venc Check (Progressive support model only)
Data write t read, and accord check
Error: 52: Write/read data discord
Error may occur due to defect of access with syscon.
(3-7) ————— (Not supported)
(3-8) External RAM Check (External RAM installed model only)
Test data write t read, and accord check
Error
Check the external RAM used in syscon.
4. Servo
(4-2) Servo DSP Check
Data write t read, and accord check
Error 12: Read data discord
0x9249, 0x2942 and 0x4294 are written to the RAM ad-
dress 0x602 of the Servo DSP and then read for checking.
(4-3) —————
Check no support.
(4-4) RF Amp Register Check
Data write t read, and accord check
Error xx: RF Amp register write, and read data discord
Implement 8-bit shift operation of the xx to the readable/
writable register of the RF Amp. If once write data do not
accord with read data, it is NG.
5. Data Supply System
(5-2) ARP Register Check
Data write t read, and accord check
Error 08: ARP register write, and read data discord
Data 0x00 to 0xFF is written sequentially to the ARP TMAX
register (address 0xC6) and then read for checking.
(5-3) ARP to RAM Data Bus
Data write t read, and accord check
Error 09: ARP Tt RAM data bus error
Data 0x0001 to 0x8000 where one bit each is set to 1 are
written to the address 0 of RAM (IC303) connected to the
ARP (IC302) through the bus, then they are read and
checked. In case of discord, written bit pattern and read
data are displayed. If data where multiple bits are 1 are
read, the bits concerned may touch each other. Further, if
data where certain bit is always 1 or 0 regardless of written
data, the line could be disconnected or shorted.
(5-4) ARP to RAM Address Bus
Data write t other address read discord check
Error 10: ARP Tt RAM address bus error
Caution: Address and data display in case of an error is
different from the display of other diagnosis (described
later).
Before starting the test, all addresses of RAM (IC303) are
cleared to 0x0000.
First, 0xA55A is written to the address 0x00000, and the
address data are read and checked from addresses 0x00001
to 0x80000 while shifting 1 bit each. Next, the data at that
address is cleared, and it is written to the address 0x00001,
and read and checked in the same manner. This check is
repeated up to the address 0x80000 while shifting the ad-
dress data by 1 bit each.
If data other than 0 is read at the addresses except written
address, an error is given because all addresses were al-
ready cleared to 0. In this check, the error display pattern is
different from that of other diagnosis; read data, written
address, and read address are displayed in this order. How-
ever, the message uses same template, and accordingly ex-
change Address and Data when reading. The following dis-
play, for example,
### Syscon Diagnosis ###
5-4. ARP to RAM Address Bus
Error 10: ARP - RAM Address B
Address
: 0000A55A
Write Data
: 00000000
Read Data
: 00080000
Press NEXT Key to Continue
Press PREV key to Repeat
_
shows the data 0xA55A was read from address 0x00080000 though
it was written to the address 0x00000000. This implies that these
addresses are in the form of shadow. Also, if the read data is not
0xA55A, another error will be present.
(5-5) ARP RAM Check
Data write t read, and accord check
Error 11: ARP RAM read data discord
The program code data stored in ROM are copied to all
areas of RAM (IC303) connected to the ARP through the
bus, then they are read and checked if they accord. If the
detail check was selected initially, the data are written to
all areas and read, then 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 11,
and the test is suspended.
6-3

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