Sharp ER-A450T Service Manual page 36

2) Content
The following process is performed for memory addresses to be
checked.
PASS1: memory data save
PASS2: Data "0000H" write
PASS3: Data "0000H" read and comparison, data "5555H" write
PASS4: Data "5555H" read and comparison, data "AAAAH" write
PASS5: Data "AAAAH" read and comparison
PASS6: Memory data restore
If a compare error is found in the check sequence from PASS1 to
PASS6, the error print (error code E1) is performed. If there is no
error found to the end of the last address, the operation is completed
normally.
Then the following address check is performed. " " shows a valid
address, and " " shows an invalid address.
In case of an error, the error code E2 is printed.
Check Address
200000H
200001H
200002H
200004H
200008H
200010H
200020H
200040H
200080H
200100H
200200H
200400H
200800H
201000H
202000H
204000H
208000H
210000H
220000H
240000H
260000H
2
7-SEGMENT DISPLAY:
3) Check the following items.
Check the termination print.
4) Test termination
The test terminates after printing the termination message.
Termination print
E1--- 200
E2--- 200
200
: Error address
[15] RS-232 Channel 1 check
0 0
(data check error)
(address check error)
(normal end)
[16] RS-232 channel 8 check
Loop back connector for D-SUB 9pin : UKOG-6705RCZZ
PIN No. 1 2
SIGNAL NAME CD RD
1) Key operation check
The program is activated by JOB#501 or JOB#550
SRV mode: 501 CA/AT : Channel 1
550 CA/AT : Channel 8
2) Functional description
If the channel specified by the JOB#CODE is not set, the machine will
result in a misoperation. When the channel is set, the machine con-
ducts the loop check concerning the channel specified by
JOB#CODE by using the loopback connector.
The following three items are checked:
Control signal check
Data transfer check
Timer check (RS-232 onboard timer)
Check
Control signal check (ERn-DRn CIn, RSn-CDn CSn loop check)
OUTPUT
ERn RSn
OFF OFF
OFF ON
ON OFF
ON ON
The read check about the above INPUT items and interrupt check of
CS, CI and CD are performed.
Read check: ER and RS are switched over in the order as
shown in the above table to confirm the logic of
DR, CI, CD and CS.If the read logic is different
from the one in the table, error print-outs occur.
Interrupt check: Allows the interruption of either of CS, CI and CD
one by one. (The mask is released.)
The interruption does not take place when each
signal is turned on. Or if the interruption occurs
when a signal is turned off, error print-outs occur.
Each of the above checks should be made in four cycles.
Check Data transfer check (SDn-RDn loop check)
In this check, a transfer of 256-byte loopback data of $00
$FF.
Note) The above check should be made with the baud rate set at
9600BPS.
Check Timer check
Before making check
10ms for RCVDT activation, and check to see that:
1) TRQ1 is not generated during the execution of check
.
2) TRQ1 is generated in 10msec. after check
ished.
3) Check the followin item
If an error occurs during the above checks, the following error print-
outs occur. Even if an error occurs during check
ued after the corresponding error print-out has occurred. An error
occurs during the execution of check
after the corresponding error print-out has occurred.
5 – 6
3 4 5 6 7 8
SD ER GND DR RS CS
INPUT
DRn CIn CDn
OFF OFF OFF
OFF OFF ON
ON ON OFF
ON ON ON
, set the corresponding timer at
, the test is contin-
or , the test is terminated
9
CI
CSn
OFF
ON
OFF
ON
is fin-