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Machine Usage Modes, Self-test
Reissue
Principles of Operation
• NVM Initialize
• Password
Self-test
All machine subsystems which contain microcontrollers and microprocessors perform Power-
On Self-Test (POST) when DC power is first applied to them. If all POST procedures are
passed, the machine goes to normal operation. If a circuit fails a POST procedure, the machine
will attempt to notify the user. However, some failures may be due to a catastrophic hardware
failure which causes the machine to completely suspend operations.
The following are the PWBAs that are connected t
ogether or t
hat communicate the machine
status and operation.
• The IOT CPU PWBA (Image Output Terminal) checks communications for the following:
– UI PWBA
– Post IPS PWBA
– Mail Box Control PWBA
– Serial Port for the PWS
• Pre IPS PWBA (Image Process System):
– Checks communications through the Post IPS PWBA and MEM. SYS PWBA
– Controls the IOT through a direct connection with the IOT Drive PWBA
– Checks DADF Control PWBA communications
• UI PWBA (User Interface) Controls:
– Control Panel Switches, LCD and the Touch Panel
– Self-test for RAM and Control Panel
• Post IPS PWBA implements image processing.
– Post IPW PWBA and the MEM SYS PWBA are connected together and assist com-
munications between the Pre IPS PWBA and the IOT CPU PWBA.
• MEM SYS PWBA stores the Image Data sent from the Pre IPS PWBA
• IOT Drive PWBA controls the IOT by signals sent from the IOT CPU PWBA
• DADF Control PWBA controls the DADF
and r
uns self-test of the RAM
• Mailbox/Sorter Control PWBA controls the Mailbox/Sorter
Integrated Digital Front End (IDFE) Self-Test
Table 1 lists the POST routines performed by the IDFE.
Table 1 IDFE Power-On Self-Test
Test Performed What’s Tested Pass Indication Fail Indication
DC Power Test -
Power S
witch ON
DC Power to IDFE
Motherboard
Power LED stays on Power LED is off
BIOS Level Test IDFE Motherboard
components
F
ailure LED goes off at
end of test
Failure LED remains on
at end of test
Software Bootup
Sequence Tes
t
Application soft-
ware integrity
Heartbeat LED blinks
continuously
Software load attempts
fail; Heartbeat LED
remains on constantly
Printer Interface
DDI
Comms
Test 1
UART (internal
loopback)
Client level command to
IOT
Failure LED blinks pat-
tern 2, but software boot
contin
ues
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