Service manual

2) Functional description
Perform the following check for the standard RAM 256 KByte SRAM.
The memory contents should not be changed before and after the
check.
Perform the following processes for memory address to be checked
(1C0000H~1FFFFFH).
PASS1: Save memory data.
PASS2: Write data "0000H."
PASS3: Read and compare data "0000H," write data "5555H."
PASS4: Read and compare data "5555H," write data "AAAAH."
PASS5: Read and compare data "AAAAH."
PASS6: Restore the memory data.
If a compare error occurs in the check sequence PASS1-PASS6, an
error print is made. If no error occurs through all addresses, the check
ends normally.
The following address check is performed further.
Check point address =
1C0000H, 1C0001H, 1C0002H, 1C0004H
1C0008H, 1C0010H, 1C0020H, 1C0040H
1C0080H, 1C0100H, 1C0200H, 1C0400H
1C0800H, 1C1000H, 1C2000H, 1C4000H
1C8000H, 1D0000H, 1E0000H, 1F0000H
3) Check the following items:
Check the termination printout.
4) Test termination
The test terminates after printing the termination printout.
Termination printout:
Normal termination 120
Abnormal termination Ex – – – – – 120
X =1: Data check error
2: Address check error
Note: When an error occurs, the error print is performed and the
check is terminated. The error occurrence address is shown in
hexadecimal at positions shown with
.
[12] Standard ROM test
1) Key operation
2) Functional description
The sum check of the standard ROM (C00000H - C7FFFFH) is per-
formed. If the lower two digits of SUM is 10H, it is normal.
3) Check the following items:
Check the printout after the test.
4) Test termination
The test automatically terminates with the following termination mes-
sage.
Normal termination print 130
ROM1
27040
Error termination print E – – – – 130
ROM1 27040
Note: " " means the ROM version number.
The underlined section (10 bytes) of code table is provided in
the ROM as standard and the table content is always printed.
The table position is the upper 10 digits of the ROM address.
The check sum correction address is the last address -0FH.
[13] A/D conversion test
1) Key operation
2) Contents
The digital conversion value of the input signal to the CPU A/D con-
vertor is displayed sequentially. The display channel changes at ap-
prox. 1 sec. intervals by a timer control and is displayed repeatedly.
Thermistor input
Vrf input: Vrf means the presumed voltage of VRF when VCC is
supposed to be +0.5V.
+24V input
Head input
Note: "XXXXX": The 10 bit data of the A/D convertor displayed in
decimal number.
Therefore, its connect may be 0000 ∼ 1024.
3) Confirmation
Check the display content.
4) Termination
When the mode switch is set to any mode other than SRV mode, the
termination print is made and the test is terminated.
151
Test termination print
[14] Option RAM test
1) Key operation
JOB
#NO.
RAM NO.
Memory to be
checked
Address area to be
checked
200 Option RAM ER-03RA 200000H ∼ 27FFFFH
10
7-SEGMENT DISPLAY:
2
130
CA/AT
10
7-SEGMENT DISPLAY:
3
151
CA/AT
11
7-SEGMENT DISPLAY:
5 1XXXX
11
7-SEGMENT DISPLAY:
5 2 XXXX
11
7-SEGMENT DISPLAY:
5 3 XXXX
11
7-SEGMENT DISPLAY:
5 4 XXXX
200
CA/AT
5 – 5