46
HCD-M700
(6-3) 1930 SP
ROM
→
AVD RAM
→
Video OUT
Error: Not detected.
The data including sub picture streams in ROM (IC107 or
IC108) are transferred to the RAM (IC504, IC505) in AV
decoder (IC503), and output as video signals from the AV
decoder (IC503). They are output from all video terminals
(Composite, Y/C, Component).
7. Video
(7-2) Color Bar
AVD color bar command write
→
Video 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).
(7-3) Composit Out
(7-4) Y/C Out
(7-6) Component Out
8. Audio
(8-2) ARP
→
1930
Error 14: ARP
→
1930 video NG
15 : ARP
→
1930 audio NG
(8-3) Test Tone
All channels
2ch Left
2ch Right
Check Items List
2. Version
(2-2) Revision
(2-3) ROM Check Sum
(2-4) Model Type
(2-5) Region
3. Peripheral
(3-2) EEPROM Check
4. Servo
(4-2) Servo DSP Check
(4-3) DSP Driver Test
5. Supply
(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) 1930 RAM
(6-3) 1930 SP
7. Video
(7-2) Color Bar
(7-3) Composit Out
(7-4) Y/C Out
(7-6) Component Out
8. Audio
(8-2) ARP
->
1930
(8-3) Test Tone
(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 (de-
scribed 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 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 im-
plies that these addresses are in the form of shadow. Also,
if the read data is not 0xA55A, another error will be present.
### 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 ac-
cord. 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.
Error 13: AVD RAM read data discord
The program code data stored in ROM (IC107 or IC108)
are copied to all areas of RAM (IC504, IC505) connected
to the AV decoder (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 in-
verted between 1 and 0. If discord is detected, faulty ad-
dress, written data, and read data are displayed following
the error code 13, and the test is suspended.
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