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2-1. Self-Diagnosis of the CPU-240 Board
Operation
Servicing on the CPU-240 digital control system is performed with the nine (9) key switches and ten (10)
LED's, while that on the CPU-240 audio system is done with the CPU-240 board built into the control unit.
First set the key switches, as shown in Section Key Data, according to the check mode, and turn the
power switch on. Refer to Section LED Display and perform the servicing. The self-diagnosis software
begins to work in the selected check mode right after the power switch is turned on.
Perform the digital overall check first and locate systems in which troubles are supposed to be involved.
Be sure to turn off and on the power switch or reset the CPU when the check mode is switched.
Key Data
b8
b7
b6
No.
KD3
KD2
KD1
KD0
1
0
0
0
2
0
0
0
3
0
0
0
4
0
0
0
5
0
0
0
6
0
0
1
7
0
0
1
8
0
0
1
9
0
0
1
10
0
0
1
11
0
0
1
LED Display
b9
b8
b7
No.
PCSEL1 DS0
AS7
1
ROM
RAM NU-RAM IC MEN
OK
OK
OK
2 CHECK OFF
OFF
OK
1
1
3 CHECK OFF
OFF
OK
1
1
4 CHECK OFF
OFF
OK
1
1
5 CHECK OFF
OFF
OK
1
1
6 CHECK OFF
ON
OFF
OK
1
0
7 CHECK OFF
ON
OFF
OK
1
0
8 CHECK OFF
ON
OFF
OK
1
0
9 CHECK OFF
ON
OFF
OK
1
0
10 CHECK OFF
ON
OFF
OK
1
0
11 CHECK OFF
ON
OFF
OK
1
0
LED
1. CHECK OK : LED ON
2. ON
: LED ON
3. OFF
: LED OFF
2-4
b5
b4
b3
b2
T4
T3
T2
1
0
0
0
1
0
0
0
1
0
0
0
1
0
0
1
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
0
1
1
1
b6
b5
b4
b3
AS6
AS5
AS4
AS3
SIO
OFF RS232C OFF
OK
OK
1
OK
ON
OFF
OFF
OFF
0
1
1
1
ON
OFF
OFF
OFF
0
1
1
1
ON
OFF
OFF
OFF
0
1
1
1
ON
OFF
OFF
ON
0
1
1
0
OFF
OFF
OFF
1
1
1
1
OFF
OFF
OFF
1
1
1
1
OFF
OFF
OFF
1
1
1
1
OFF
OFF
ON
1
1
1
0
OFF
ON
OFF
1
1
0
1
ON
OFF
OFF
1
0
1
1
b1
b0
HEX
T1
T0
CODE
0
0
020
Digital overall check
(No.2 to 11 once)
0
1
021
ROM check (once)
1
0
022
RAM check (repeat)
0
0
024
NV-RAM check (once)
0
0
028
IC Memory check (once)
0
1
041
SIO CN1 check (repeat)
1
0
042
SIO CN2 check (repeat)
0
0
044
SIO CN3 check (repeat)
0
0
048
SIO CN4 check (repeat)
0
0
050
SIO RS232C check (repeat)
1
1
05F
SIO CN5 check (repeat)
b2
b1
b0
AS2
AS1
AS0
OFF
OFF
Digital overall check (once)
1
1
1
OFF
OFF
ON
ROM check (once)
1
1
0
OFF
ON
OFF
RAM check (repeat)
1
0
1
ON
OFF
OFF
NV-RAM check (once)
0
1
1
OFF
OFF
OFF
IC Memory check (once)
1
1
1
OFF
OFF
ON
SIO CN1 check (repeat)
1
1
0
OFF
ON
OFF
SIO CN2 check (repeat)
1
0
1
ON
OFF
OFF
SIO CN3 check (repeat)
0
1
1
OFF
OFF
OFF
SIO CN4 check (repeat)
1
1
1
OFF
OFF
OFF
SIO RS232C check (repeat)
1
1
1
OFF
OFF
ON
SIO CN5 check (repeat)
1
1
0
Check Mode
Check Mode
LLC-8000A
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