Hitachi NR 1890DC User manual

PRODUCT NAME
Hitachi 18 V Cordless Strip Nailer
Models NR 1890DC NR 1890DBCL
NR 1890DR NR 1890DBRL
TROUBLESHOOTING GUIDE ---------------------------------------------------------------------------------------1
1. Troubleshooting and corrective action ---------------------------------------------------------------1
2. Corrective action when the orange LED blinks ----------------------------------------------------6
3. Maintenance mode ---------------------------------------------------------------------------------------7
4. Resetting error mode (when the orange LED is blinking) ---------------------------------------7
REPAIR GUIDE ----------------------------------------------------------------------------------------------------------8
1. Precautions on disassembly and reassembly ------------------------------------------------------8
• Preparation before disassembly ---------------------------------------------------------------------8
• Disassembly and reassembly of the magazine section ----------------------------------------9
• Disassembly and reassembly of the output section ------------------------------------------ 12
• Replacement of the piston ass'y-------------------------------------------------------------------- 23
• Replacement of sensor (B)--------------------------------------------------------------------------- 26
• Feeding compressed air ----------------------------------------------------------------------------- 27
• Checking after reassembly ------------------------------------------------------------------------- 29
• Tightening torque ------------------------------------------------------------------------------------- 30
• Connecting diagram ---------------------------------------------------------------------------------- 31
STANDARD REPAIR TIME (UNIT) SCHEDULES ------------------------------------------------------------- 32
CONTENTS
CONFIDENTIAL
NR 1890DC: K858
NR 1890DBCL:
NR 1890DR: K859
NR 1890DBRL:
Jul. 2017
NR 1890DR
NR 1890DC
N
Page
Overseas Sales Division

-1-
1. Troubleshooting and corrective action
Problem Possible cause
(*: Most common cause) Inspection method Corrective action
1.
Nails
cannot be
driven.
<Nails>
• Magazine is not loaded with
specified Hitachi genuine nails.
• Magazine is loaded with
abnormal nails (e.g., bent nails,
abnormal collation)
• Check whether the
magazine is correctly
loaded with specified nails.
• Use specified nails.
• Remove abnormal
nails and load the
nailer with proper
nails.
• Worn-out piston tip • Check whether the piston
tip is excessively worn.
• Replace defective
parts. See page 23.
• Piston trouble • Check the piston for any
trouble (e.g., deformation,
burring, break).
• Replace defective
parts. See page 23.
<Magazine section>
• Nail feeder trouble (deformation,
burring, break)
• Worn-out nail rail or magazine
plate
• Check the nail feed section
for any trouble (e.g.,
burring, deformation,
break, excessive wear).
• Remove burring.
• Correct the deformed
portion.
• Replace defective
parts.
• Nail guide groove of blade guide
(B) too narrow or wide
• Nail guide groove trouble
(protrusion or burring) of blade
guide (B)
• Step in the nail shank guide
groove between blade guide (B)
and magazine
• Nail guide groove of the
magazine too narrow or wide
• Nail guide groove trouble
(deformation or burring) of the
magazine
• Load nails in the nailer and
make sure the nailer works
normally.
* Unwanted objects (e.g., dust,
wood dust, adhesives) in the nail
guide groove of blade guide (B),
magazine and nail feeder
• Load nails in the nailer and
make sure the nailer works
normally.
• Remove unwanted
objects (e.g., dust,
wood dust,
adhesives).
• Loose bolts of the output section
and the magazine section — • Tighten the bolts at the specified torque.
• Nail feeding trouble • Check the nail feeder slide
surface for dust.
• Check the nail feeder slide
surface for deformation.
• Check the ribbon spring for
damage.
• Replace defective
parts.
• No compressed air in the nailer
• Compressed air leak
• Fill up the nailer with
compressed air, leave the
nailer still for one day, and
then check the nailing
work.
• Check the sealing surfaces,
X-rings, and O-rings inside
the cylinder, piston,
chamber cover, and
chamber base for flaws,
unwanted objects, and
other failures.
• Supply compressed
air.
• Disassemble the nailer
and clean the
chamber, piston, and
their vicinity.
• Replace the sealing
parts.
TROUBLESHOOTING GUIDE

-2-
Problem Possible cause
(*: Most common cause) Inspection method Corrective action
2.
Nails are
driven but
bent.
*• Worn-out piston tip
*• Broken or worn-out blade
rack
• Check the piston tip for
excessive wear.
• Check the blade rack for
break or wear.
• Replace defective
parts. See page 23.
• Nails are not completely fed
into the injection port.
• Unspecified nails are used.
• Check whether the
magazine is correctly loaded
with specified nails.
• Use specified nails.
• Remove abnormal
nails and load the
nailer with proper
nails.
• Wood material too hard to be
nailed
• Drive nails into soft wood
and check whether the
driven nails are bent.
• This nailer is not for
hard wood.
• Deformed output section • Check the tips of the
pushing lever and blade
guide for warp, deformation
and excessive wear.
• Replace defective
parts.
3.
Nails
cannot be
driven into
the
workpiece
completely:
the heads
cannot be
made flush.
• Worn-out piston tip • Check the piston tip for
excessive wear.
• Replace defective
parts. See page 23.
*• Worn-out piston rack • Check the piston rack for
excessive wear.
• Replace defective
parts. See page 23.
• Inadequate adjuster control • Set the adjuster to nail
deeper and then nail again.
• Set the adjuster
properly.
• Wood material too hard to be
nailed
• Drive nails into soft wood
and check whether the nail
heads are lifted.
• This nailer is not for
hard wood.
• Weak thrusting force against
wood to be nailed
• Firmly thrust the nailer
against wood to be nailed
and start nailing. Check
whether the nail heads are
still lifted.
• Follow the nailer
operation guide.
• Deformed output section • Check the nail guide groove
of the pushing lever and
blade guide for any trouble
(e.g., deformation,
excessive wear, burrs).
• Replace defective
parts.
• Insufficient grease on the
cylinder and piston section
• Check the greasing
condition of the cylinder and
piston section.
• Replenish grease.
• No compressed air in the
nailer
• Compressed air leak
• Fill up the nailer with
compressed air, leave the
nailer still for one day, and
then check the nailing work.
• Check the sealing surfaces,
X-rings, and O-rings inside
the cylinder, piston,
chamber cover, and
chamber base for flaws,
unwanted objects, and other
failures.
• Supply compressed
air.
• Disassemble the
nailer and clean the
chamber, piston, and
their vicinity.
• Replace the sealing
parts.
4.
Nails jam.
*• Abnormal nails are used
(e.g., bent nails, abnormal
collation)
• Nails are not completely fed
into the injection port.
• Check whether the
magazine is correctly loaded
with specified nails.
• Use specified nails.
• Remove abnormal
nails and load the
nailer with proper
nails.
• Worn-out piston tip • Check whether the piston tip
is excessively worn.
• Replace defective
parts. See page 23.
• Wood material too hard to be
nailed
• Drive nails into soft wood
and check whether nails
jam.
• This nailer is not for
hard wood.

-3-
Problem Possible cause
(*: Most common cause) Inspection method Corrective action
4.
Nails jam.
• Piston slide surface trouble
(e.g., galling, break)
• Check the surfaces on
which the piston slides
(blade guides (A) and (B)
and pushing levers (A)
and (B)).
• Replace defective
parts.
<Magazine section>
• Nail feeder trouble (e.g.,
deformation, burring, break)
• Check the nail feed section
for any trouble (e.g.,
burring, deformation,
break, excessive wear).
• Remove burring.
• Correct the deformed
portion.
• Replace defective
parts.
• Nail guide groove of the blade
guide (B) too narrow or wide
• Nail guide groove trouble (e.g.,
protrusion, burrs, excessive
wear) of blade guide (B)
• Nail guide groove of the
magazine too narrow or wide
• Nail guide section trouble (e.g.,
deformation, burrs) of the
magazine
• Load nails in the nailer and
check that the nailer works
normally.
• Remove burring.
• Replace defective
parts.
• Unwanted objects (e.g., dust,
wood dust, adhesives) in the
nail guide groove of the
magazine and nail feeder
• Load nails in the nailer and
check that the nailer works
normally.
• Remove unwanted
objects (e.g., dust,
wood dust, adhesives).
• Deformed output section • Check pushing lever (A)
and blade guides (A) and
(B) for deformation,
excessive wear, and burrs.
• Replace defective
parts.
• Misaligned assembly of blade
guide (B) and magazine
• Set Hitachi genuine nails
in the nailer and lightly
push them against the
magazine. Make sure the
nail tips closely touch the
nail guide surface of blade
guide (B).
(See "Disassembly and
reassembly of the
magazine section.")
• Reassemble blade
guide (B). See page 11.
• Loose bolts of the output
section and magazine section ―• Tighten the bolts at the specified torque.
5.
Nailing
started by
single
triggering.
*• Malfunction caused by
unwanted objects (e.g.,
adhesive, dust) near pushing
lever (A), (B) or blade guide
(A) or by deformation of the
lever or blade guide
• Check that pushing lever
(A) moves smoothly (in a
body).
• Clean the pushing lever
and the blade guide.
Then apply oil to them.
• Replace defective
parts.
• Broken or worn-out pushing
lever spring (B)
• Check the spring for any
trouble.
• Replace defective
parts.

-4-
Problem Possible cause
(*: Most common cause) Inspection method Corrective action
6.
No nailing
operation
without
motor
rotation
sound.
• Dry-fire lockout mechanism
is activated.
• Count the number of
remaining nails. There
should be 9 or more
remaining nails.
• Load nails.
*• Wire-related trouble of
wiring, switch cable (A), and
sensor (B)
• Check whether the wires and
sensor (B) are firmly
soldered.
• Check whether the rotor
emits a parching smell.
• Check the conductivity of the
switch and microswitch by
using a multimeter.
[Checking procedure]
(1) When switch cable (A) is
not defective:
• Set the switch to OFF and
apply tester probes to the
points shown in the figure
below. Make sure the
terminals are not electrically
connected.
• Set the switch to ON and
apply tester probes to the
points shown in the figure
below. Make sure the
terminals are electrically
connected.
(2) When the microswitch is
not defective:
• Set the switch to ON and
apply tester probes to the
points shown in the figure
below. Make sure the
contacts are electrically
connected.
• Set the switch to OFF and
apply tester probes to the
points shown in the figure
below. Make sure the
contacts are not electrically
connected.
• Firmly resolder the
disconnected wires.
• Replace defective
parts.
Microswitch
Silicone Apply multimeter probes here.
NOTE: Remove the silicone a little and apply the
multimeter probes to the exposed terminal metal.
Apply multimeter probes here.
(1) (2)