User Manual Part 1

TROUBLESHOOTING
72 MM101271V1 R2A
on J7-A21. This RS232 signal comes in to U24-6, gets converted to 3.3V levels at U24-
17 and goes to SCC3RX on U1 (not accessible).
The 860 processor U1 (not accessible) echoes characters out SCC3TX at 3.3V level and
drives RS232 converter U24-14. U24-9 drives out to the card edge (J7-A22) at RS232
levels.
9.4.3.20 TEST SMC2
Procedure:
Connect terminal to J14H on rear of shelf. Set terminal for 38.4kbd, N81. Type a few
characters and observe characters echoed to terminal.
Troubleshooting information:
This is a normal serial port of the 860 processor. The card edge interface is RS232, which
is converted to 3.3V levels to the processor. SMC2TX originates from U1 (not
accessible) at 3.3V level and drives RS232 converter U24-12. U24-11 drives out to the
card edge at RS232 levels. The fixture loops TX to RX so the RS232 signal comes back
into U24-8, gets converted to 3.3V levels at U24-15 and goes to SCC3RX on U1 (not
accessible).
This is a normal serial port of the 860 processor. The card edge interface is RS232, which
is converted to 3.3V levels to the processor. SMC2RX comes in to the Controller Board
on J7-A17. This RS232 signal comes in to U24-8, gets converted to 3.3V levels at U24-
15 and goes to SMC2RX on U1 (not accessible).
The 860 processor U1 (not accessible) echoes characters out SMC2TX at 3.3V level and
drives RS232 converter U24-12. U24-11 drives out to the card edge (J7-A18) at RS232
levels.
9.4.3.21 I/O OUTPUTS TEST - GROUP A
Procedure:
To test each output, the FactoryTest Manual Mode Command is given to cause the
monitor point to go high or low. Connect a 10K pullup resistor from the monitor point to
5V in order to see the result. J11 is on the rear of the shelf.
Table 24 - FactoryTest Manual Mode Commands
SIGNAL
NAME
10K
PULLUP
REQUIRED
COMMAND
HIGH
COMMAND
LOW
MONITOR
POINT
CPPTOUT yes W stn_ctrl 0x00 W stn_ctrl 0xFF J11-6
TXCGDIS yes W stn_ctrl 0x00 W stn_ctrl 0xFF J11-7
RPT_INH yes W stn_ctrl 0x00 W stn_ctrl 0xFF J11-3
RPTKEY yes W stn_ctrl 0x00 W stn_ctrl 0xFF J11-5
SPARE1 yes W stn_ctrl 0x00 W stn_ctrl 0xFF J11-1
SPARE2 yes W stn_ctrl 0x00 W stn_ctrl 0xFF J11-2