B064 SERIES SERVICE MODE
SM 4-29 B064 Series/B140 Series/G126
Trouble-
shooting
SC800: Overall System
SC No. Symptom Possible Cause
Video output transfer does not end (K) 800 D
Video signal is sent to the engine
but no command is received within
the prescribed time from the engine
to signal the end of transfer –
output all black.
• Controller board defective
Video input transfer does not end (K) 804 D
Video transfer is requested from the
scanner, but no command is
received within the prescribed time
from the scanner to signal a
response – output all black.
• Controller board defective
Watchdog error 818 C
Control error
• System program defective
• Controller board defective
• Optional board defective
Fatal kernel error 819 C
Software defective
• Software defective
Self-diagnostic error: CPU 820 C
Unexpected external error or
interrupt occurred.
• Controller board defective
• Software defective
Self-diagnostic error: ASIC 821 C
ASIC timer interrupt and CPU timer
interrupt are compared and found
to be out of range.
• Controller board defective
Self-diagnostic error: HDD 822 C
Check performed when HDD is
installed:
• HDD device busy for over 31 s.
• After a diagnostic command is
set for the HDD, but the device
remains busy for over 6 s.
• A diagnostic command is issued
to the HDD device but the result
is an error.
• HDD defective
• HDD harness disconnected, defective
• Controller board defective
Self-diagnostic error: NIB 823 C
• The SUM of the MAC address
written in the SEEP ROM for the
MAC address is calculated and
compared with the stored SUM
and judged NG.
• There is a format error in the
MAC address stored in the SEEP
ROM for the MAC address.
• A loopback error occurs on the
PHY chip of the NIB.
• NIB board defective
• Controller board defective
Self-diagnostic error: NVRAM 824 C
NVRAM device does not exist, or
NVRAM device is damaged.
• NVRAM defective
• Controller board defective
Self-diagnostic error: NVRAM (option) 825 C
Optional NVRAM is installed, but a
write/verify error occurred.
• Incorrect NVRAM installed.
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