Self Diagnostics Of Cpu-181 Board; Checking The Cpu; Checking The Keys And Leds; Checking The Lines Connecting - Sony SX-M700 Service Manual

4-3. SELF DIAGNOSTICS OF CPU-181
BOARD

4-3-1. Checking the CPU

Check the CPU in the following order:
1. ROM CHECK
2. RAM CHECK
3. DPRAM CHECK
4. SIO CHECK
1 Bit switch settings
1 2 3 4 5 6 7
O
N
2 To enable the SIO check of the SX-M700/M100 to be
performed, short pins 1 and 2, and pins 3 and 4 of
CN1.
3 Turn on the main power, or press the RESET switch.
4 Perform the above steps 1 through 4. The
corresponding LEDs from D2 to D4 turn on. If an error
occurs, the bit blinks. If no errors occur, LEDs D2 to
D9 turn on.

4-3-2. Checking the Keys and LEDs

1 Bit switch settings
1 2 3 4 5 6 7
O
N
2 Connect a *IPU which is known to be good.
3 Turn on the main power.
4 Each time a key on the display panel is pressed, the
LED toggles between lit and blinking. If the SLOW
button of the IPU is pressed, three LEDs turn on.
*IPU : Interpreter's Unit
4-4(E)
8
O
N
8
O
N
4-3-3. Checking the Lines Connecting the
Delegate and Chairman Units
1 Bit switch settings
1 2 3 4 5 6 7
O
N
2 Set bit 1 and bit 2 to check the corresponding line 1 to
4.
BIT 1 BIT 2 Line selected
OFF OFF LINE 1
ON OFF LINE 2
OFF ON LINE 3
ON ON LINE 4
3 Connect the *D/C units which are known to be good to
the selected line.
4 Turn on the main power.
5 LED D2 to D5 lights corresponding to lines 1 to 4. If
an error occurs, the LED blinks.
*D/C units : Delegate and Chairman's Units

4-3-4. Factory Default Settings

Factory default settings
BIT 1 BIT 2
SX-M700 ON OFF
SX-M100 OFF OFF
SX-E120 OFF ON
8
O
N
Bit 3 to Bit 8
All OFF
SX-M700