Makita Maktec DC1851 Guide

P 1/ 5
Model No.
Description
CONCEPT AND MAIN APPLICATIONS
Specification
Dimensions: mm (")
Width (W)
Height (H)
Length (L) 150 (5-7/8)
100 (3-15/16)
65 (2-9/16)
Model DC1851 is a maktec charger developed specially for
charging new slide-style Li-ion batteries.
New maktec Li-ion batteries model L1451 (14.4V-1.1Ah)
and model L1851 (18V-1.1Ah) can be charged approximately
in 60 minutes. Also, the Makita brand Li-ion batteries designed
with the same concept, model BL1411G (14.4V-1.1Ah) and
model BL1811G (18V-1.1Ah) can be charged.
In order to achieve a cost-competitive advantage, this charger
is not equipped with:
• Optimum Charging System
• Forced air-cooling system
Also note that it is not compatible with:
• ADP01 Interchangeable adapter
• ADP02 Refreshing adapter
• ADP03 Automatic refreshing adapter
• ADP04 Interchangeable adapter
PRODUCT
DC1851
Charger
Continuous Rating (W)
Voltage (V) Cycle (Hz) Input Output Standby power (W)
100 - 240
220 - 240
110 - 120
Current (A)
50/60
50/60
41
41
50/60 41
0.3
0.3
0.3
*The charging time may depend on various conditions such as room temperature,
the condition of battery, etc.
Output voltage
Output current
Charging time*
DC 14.4 - 18V
DC 1.65 - 1.1A
approx. 60 min.
Protection against electric shock Double insulation/ Grounding
Weight according to
EPTA-Procedure 01/2003: kg (lbs)
Power supply cord: m (ft)
0.35 (0.77)
2.0 (6.6)
TECHNICAL INFORMATION
LW
H
Standard equipment
Optional accessories
No
No

P 2/ 5
Repair
[1] DISASSEMBLY/ASSEMBLY FOR DC1851
[1] -1. Terminal unit and Charger case complete
Fig. 1
CAUTION: Disconnect the charger from the power source for safety before repair/ maintenance!
DC1851 has two different kinds of specifications. Distinguish them by name plate
“DC1851” and “DC1851 U” and follow each insturction. Do not use the different
parts in repair.
DISASSEMBLING
1. Turn Charger upside down and remove
four tapping screws.
2. Turn Charger over again and open Charger case complete
from rear side.
Charger case complete
Terminal unit
Charger case cover
*Open from
this side
Replace Charger case complete as drawn in Figs. 1 and 2.
Note: Terminal unit is fully integral with Charger case complete.
When it is necessary to replace Terminal unit, replacing
Charger case complete and Charging condition label is required.
Fig. 2
Charging circuit Connector
3. When replacing Charger case complete;
(1) By pinching Push mount tie, remove it from Charging circuit.
(2) Remove Connector from Charging circuit.
Push mount tie
Pinch both levers of Push mount tie
when pulling it off from Charger circuit.
Tapping screws
Indication of DC1851

P 3/ 5
Repair
[1] DISASSEMBLY/ASSEMBLY FOR DC1851
[1] -1. Terminal unit and Charger case complete (cont.)
Fig. 3
1. Set Connector on Charging circuit as drawn below.
Then insert Push mount tie into the hole of
Charging circuit until its levers are fixed in the hole.
3. Assemble Charger case complete to Charger case cover.
Be sure to securely tighten four tapping screws.
ASSEMBLING
Assemble Charger case cover and Charger case complete as drawn in Fig. 3.
Charging circuit
Push mount tie
Connector
Power supply cord
Charger case cover
[1] -2. Replacing Varistor and Fuse
(1) If the cause of Battery charger trouble is the breakage of Varistor and Fuse, you need not replace
Charging circuit, but simply replace Varistor and Fuse.
Sign of Varistor breakage:
Cracks exists in the surface of Varistor.
Cause of Varistor breakage:
Charger is plugged in a power source of two times or more than the rated voltage of Varistor.
Note: If Fuse has burned out meanwhile Varistor is not broken, something else in Charging circuit is probably
causing the trouble. In this case, replace Charger circuit.
(2) Replace Varistor and Fuse. (Fig. 4)
Fig. 4
Varistor/ Fuse is soldered on Charging circuit.
Remove a broken Varistor/ Fuse with soldering iron.
And solder new one with soldering iron.
Fuse
Varistor
2. Push Lead wires firmly between the ribs and
the wall of Charger case cover.

P 4/ 5
Repair
[2] DISASSEMBLY/ASSEMBLY FOR DC1851 U
[2]-1. Terminal unit and Charger case complete
DISASSEMBLING
Replace Charger case complete.as drawn in Figs. 5 and 6.
Important: After disconnecting the charger from the power source, wait more than 5 minutes before repairing work.
Fig. 5
1. Turn Charger upside down and remove
four tapping screws.
2. Turn Charger over again and open Charger case complete
from rear side.
Charger case complete
Charger case cover
*Open from
this side
Note: Terminal unit is fully integral with Charger case complete.
When it is necessary to replace Terminal unit, replacing
Charger case complete and Charging condition label is required.
Terminal unit
Tapping screws
Indication of DC1851 U
ASSEMBLING
Assemble Charger case complete to Charger case cover by
reversing the disassembly procedure.
Be sure to push Power supply cord firmly between the ribs
and the wall of Charger case cover as drawn in Fig. 7.
Fig. 6
Fig. 7
Charging circuit Connector
Power supply cord
3. Hold the connector on Charging circuit and pull up the connector.

P 5/ 5
Repair
[2] DISASSEMBLY/ASSEMBLY FOR DC1851 U
[2] -2. Replacing Varistor and Fuse
Neither Varistor nor Fuse is supplied for the repair.
When they have damages, replace Charging circuit with a new one.