Sony DVP-S3000 Operating Instructions / Mode d’emploi, Руководство по обслуживанию

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6-2
(2-3) Syscon RAM (IC094) check
IC093 (Syscon ROM)
n
IC094 (Syscon RAM) collating check
Checking range: 0x01000000 - 0x0101ffff
IC093 (Syscon ROM) data (program codes) are transferred in DMA
mode in the unit of 64 bytes to the IC094 (Syscon RAM), then they
are read every 1 byte and compared with data in IC093. As the
Syscon RAM check is made by saving the data into internal RAM
(DMA transfer), the data are written and read every 64 bytes, and
interruption during that time is completely masked.
If compared data are not same, a checking is suspended, and error
code 05, its address, written data, and read data are displayed. Se-
lect the subsequent processing by pressing a key. As this check is
made through DMA transfer, if Repeat is selected, the data are trans-
ferred in DMA mode again to the block where this error occurred
and a checking is continued from the error address.
(3) Clock
(3-2) Audio clock system output switching (CD side)
I/O output
The audio clock system is switched to the CD side. In this check,
the Syscon itself does not detect an error. Observe output signals
with an instrument.
(3-3) Audio clock system output switching (DVD side)
I/O output
The audio clock system is switched to the DVD side. In this check,
the Syscon itself does not detect an error. Observe output signals
with an instrument.
(4) Drvcon
(4-2) Drvcon (IC136) reset check
Hard Reset
n
DRV BUSY response input
The Hard Reset signal is output, and after cancelling the reset,
whether DRV BUSY signal changes from “low” to “high” is
checked. The detection timing of DRV BUSY “low” is about 250
msec after the reset is cancelled. Also, whether the signal becomes
“high” later is checked.
After confirming “high” or “low” of DRV BUSY signal 250 msec
after reset was cancelled, if the signal does not go “high” though
about 300 msec elapsed, the reset error 02 is output.
Confirm the result, and to cancel checking, press [RETURN],
[MENU], or [POWER]. Or, to continue next checking, press other
than these keys.
The ROM revision and checksum of Drvcon are displayed when
executing “DrvCon Data Exchange” and “DrvCon EPROM” re-
spectively.
Also, in case of an error, the error code and information are dis-
played as shown in Figure 4.
Syscon Diagnosis
IF con Ver.x.xx (xxxx)
SYScon Ver.x.xx (xxxx)
DRVcon Ver.x.xx (xxxx)
CXD 1900BQ DRAM
Error Code: 05
Address: 000abcde
Write Data: fb
Read Data: ff
SIRCS:ff KEY:ff RATE: 29
N
Name of item checked
N
Error code
N
Error address
N
Written data (2/4 digits)
N
Read data (2/4 digits)
Figure 4
Except error code “05” (write/read data mismatch error), the ad-
dress and data fields show “0”. When a checking is over or can-
celled, “Diag OK” or “Diag Error End” message blinks. If a key is
pressed here, the test mode initial menu is resumed. The “Diag
Error End” is displayed only when the Syscon detects an error, and
visual inspection result is out of the display.
6-2-1. General description of checking method
This section describes briefly a checking method for each item in
the order of menus.
Numbers in ( ) for respective items are diagnosis item numbers.
(2) Memory
(2-2) Syscon ROM (IC093) check
Calculation of checksum
Calculation range: 0x00000000 - 0x000fffff (at commercial prod-
ucts, 8Mbit ROM)
All 8bit data from address 0 to ROM size are added (checksum),
and output as 4-digit hexadecimal number.
In this check, the IC090 (Syscon) itself does not detect an error.
The result is displayed on the screen. Compare it with original ROM
checksum.