Sony DVP-F21 Service Manual page 61

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5. Supply
(5-2) ARP Register Check
Data write → 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 → read, and accord check
Error 09: ARP ← → 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 → other address read discord check
Error 10: ARP → 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.
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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 address 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
already 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. However, the message uses same template, and
accordingly exchange Address and Data when reading.
The following display, for example, 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.
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### 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
_
(5-5) ARP RAM Check
Data write → 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 (IC302)
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. AV Decoder
(6-2) 1930 RAM
Q Q
Data write → read, and accord check
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Error 13: 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 (IC503) 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 13, and the test is suspended.
During the test, OSD display becomes blank as the OSD
area is also checked.
(6-3) 1930 SP
ROM → AVD RAM → Video OUT
Error: Not detected.
The data including sub picture streams in ROM (IC107)
are transferred to the RAM (IC504, IC505) in AVD
(IC503), and output as video signals from the AVD
(IC503).
Though OSD display becomes blank, the output of video
signals continues until the key is pressed.
They are output from all video terminals (Composite, Y/
C, Component) except EURO AV terminal.
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