Brother MFC620CN Service Manual page 173

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.
Reassembling Notes
• When replacing the old type of the head/carriage unit with a new type, also replace the current
upper cover and head cover with a new type. For the mounting procedure of the new type of the
head/carriage unit, see
• 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 film
and FFC sponge, 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 head flat cables to section "b" of the cable clamp on the head joint.
Latch
Head/carriage unit
page 5-43.
5-35
Head casing (upper)
Air buffer cap
Head casing (lower)
Chapter 6, Section 6.2.
Confidential