Lexmark T650n Service Manual page 147

Error
code or Error contents
message
990.51 HCIT tray lift motor
PWM underflow error
990.53 HCIT tray lift motor
ramp error
990.54 HCIT tray lift motor
lost encoder failure
990.90 Sensor connection
failure
991.00 System card failure
991.05 Checksum failure
Description/Action
The HCIT tray lift motor does
not operate at the specified
speed reported by tray x
The HCIT tray lift motor does
not reach the specified speed
at the specified time.
The HCIT tray lift motor is not
reporting pulses back to the
engine.
Hardware error (sensors are
not plugged on the board)
Device system card failed
basic assurance test.
Bad checksum
Possible repair actions
1. Check for obstruction in the
HCIT tray lift area.
2. Check the connections on
the HCIT tray lift motor
assembly for proper
connection.
3. Replace the HCIT tray lift
motor drive motor assembly if
problem remains. Go to "High
capacity input tray (HCIT)
tray lift drive motor assembly
removal" on page 4-86.
1. Check for obstruction in the
HCIT tray lift area.
2. Check the connections on
the HCIT tray lift motor
assembly for proper
connection.
3. Replace the HCIT tray lift
drive motor assembly if
problem remains. Go to "High
capacity input tray (HCIT)
tray lift drive motor assembly
removal" on page 4-86.
1. Check for obstruction in the
HCIT tray lift area.
2. Check the connections on
the HCIT tray lift motor
assembly for proper
connection.
3. Replace the HCIT tray lift
drive motor assembly if
"High
problem remains. Go to
capacity input tray (HCIT)
tray lift drive motor assembly
removal" on page 4-86
Replace all connections on the
system card assembly.
Replace the system card
assembly.
Go to "System card
assembly removal (T650,
T652, T654)" on page 4-69.
Replace the system card
assembly.
"System card
Go to
assembly removal (T650,
T652, T654)" on page 4-69.
Diagnostic information
4062
2-115