Brother MFC640CW Service Manual page 126

NOTE: When storing the head/carriage unit for a long period, be sure to put an air buffer cap
on the head/carriage unit and store the unit in the head casing, as shown below. Leaving the
head/carriage unit out of the casing will cause the print nozzles and ink supply ports to dry up,
resulting in a damaged head.
Head/carriage unit
Reassembling Notes
• When handling the head/carriage unit, put on a grounding wrist band and perform the job on a
static mat. Also take care not to touch the conductor sections on the flat cables.
• When you set a new head/carriage unit to the machine, apply lubricant to the 5 points specified in
Section 5.2.
• After replacement of the head/carriage unit, check that the CR encoder strip and PF encoder disk
are free of grease. If they are stained with grease, replace them.
• If you replace the head/carriage unit, make adjustments specified in
• When mounting the head/carriage unit, route the head flat cables and attach the FFC support,
using the following procedure. (See the illustration on the next page.)
1) Attach a piece of double-sided adhesive tape, which is used to secure the head flat cable 1 to
the lower cover, to the position shown on the next page.
2) Attach the CR timing belt to the head/carriage unit, then mount the head/carriage unit to the
engine unit.
3) Make sure that the head joint rubber is set on the head/carriage unit. Then secure the head
joint to the head/carriage unit with the joint leaf spring.
4) Set the FFC support to the head flat cables. (See the illustration on
5) Mount the carriage PCB with head flat cables onto the head/carriage unit.
atch
5 - 4 0
Head casing (upper)
Air buffer cap
Head casing (lower)
Chapter 6, Section 6.2.
page 5-35.)
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