Hitachi IJ UX Service Manual page 270

6.4.14 Product Speed Matching Error
The frequency of the encoder signal is exceeding the
printing capability of the IJ printer.
Lower the frequency of the encoder signal, or increase its
dividing ratio. Note that the printed character width will
change if the Pulse rate div. Factor is changed.
See Technical Manual 4.3.3-3, "Method of calculating the
conditions which allow product speed matching".
6.4.15 Cooling fan warning
Cooling Fan Warning
Disconnect the EZJ126 board CN13
connector, EZJ132 board CN1 and
CN3 connector, intake fan harness
and reconnect it.
Does the fault recur?
Does the electric wire of
Sensor Harness UX have
disconnection or damage?
Replace intake fan unit.
Does the fault recur?
Replace the EZJ126 board.
Product Speed
Matching Error
Resume the
operation.
No
Yes
Yes
No
Yes
No
Yes
6-52
Replace Sensor Harness UX
Does the fault recur?
No
Resume the operation