U4989A PAG NMH UPGRADE FITTING INSTRUCTIONS U4989A PAG NMH UPGRADE FITTING INSTRUCTIONS
PAG NMH Upgrade
Suitability
The following PAG chargers may be upgraded to charge PAG NMH batteries.
Other models, or those with earlier serial numbers than shown, will not operate
with the upgrade microcontroller. Units with later serial numbers have already
been factory fitted with the upgraded microcontroller.
Model: Model No: Serial No:
AR124 9767 000839 to 005632
AR121 9768 000714 to 000858
AR124NP 9769 003048 to 006555
AR121PL 9772 001040 to 002428
AR122PL 9789 000503 to 000669
for AR Series Chargers
Model No. 9673
FITTING INSTRUCTIONS
Why Upgrade My Charger?
Some of the new Nickel-Metal Hydride batteries from PAG Ltd. must be charged at
a lower rate than the standard 4A output of a 12V AR Series charger. These
batteries contain intelligent circuits, enabling them to recognise a suitable AR
charger, and control the charging current down to the correct level. The circuit is
designed to prevent the battery from accepting a charge from unsuitable sources.
The following batteries can only be charged from an upgraded charger:
PAG NMH60 Model No. 9374
PAG NPH Model No. 9323
The larger PAG NMH batteries (such as the NMH100) can be charged at the full
4A output. An NMH upgrade is not required for these batteries.
IMPORTANT: The NMH upgrade enables early model 12V AR Series chargers to
safely charge PAG NMH batteries as detailed above. The modification does not
make the charger suitable for charging non-PAG Nickel-Metal Hydride batteries.
Contents
This kit contains all the necessary parts to upgrade your charger so that it is suitable
for charging PAG NMH batteries. The following components are included in this kit:
❋
Qty 1 PAG NMH compatible microcontroller.
❋
Qty 1 upgrade identification label.
❋
Qty 1 Instruction Manual amendment.
❋
Qty 4 self-adhesive rubber pads.
Additionally, you will require a Pozidriv™ No. 2 screwdriver.
General
The upgrade procedure entails the replacement of the microcontroller IC and the
fitting of a label to indicate that the charger has been upgraded. Please read these
instructions fully before starting any disassembly of the charger. The procedure is not
complex, but it is important for reasons of safety that the charger is reassembled
correctly. If you are in any doubt about your ability to complete the upgrade
procedure, please consult PAG Limited.
Upgrade Procedure
1. Disconnect the charger from the mains supply, and then unplug the mains input
lead from the rear panel of the charger.
U4989A PAG NMH UPGRADE FITTING INSTRUCTIONS U4989A PAG NMH UPGRADE FITTING INSTRUCTIONS
2. IMPORTANT: parts of the charger PCB assembly retain a high voltage even after
the mains supply has been disconnected. Wait for a period of five minutes
following disconnection before commencing disassembly.
3. Prise the self-adhesive rubber pads out of the circular foot mouldings to reveal
the case fixing screws. Unscrew and remove the fixing screws.
4. Remove the lid. It may be necessary to pry between the lid ‘claws’ and the front
panel with a small screwdriver. Note the loose spacers which are fitted to the lid
of non-’NP’ models.
5. Remove the back panel, and then lift the entire charger PCB up to clear the
locations in the base, and then rearwards out of the case.
6. Unplug the front panel ribbon cable from the charger PCB assembly.
The microcontroller is situated underneath the ribbon cable.
7. Remove the microcontroller using the extraction tool supplied. The kit will include
either a single-claw or a twin-claw extraction tool.
Single-claw tool: Insert the hook into each of the corner slots in turn, gently
levering the microcontroller upwards until it is released.
Fig.1
Orientation of chip
viewed from front of charger.
Twin-claw tool: Insert the claws of the extraction tool into two opposite slots in
the carrier. Carefully squeeze the plastic arms of the tool to extract the
microcontroller.
NOTE: The single-claw tool is designed only for use with leaded-through PLCC
carriers, and is not suitable for subsequent use with surface-mount (SMD) carriers.
8. IMPORTANT: Note the polarisation of the microcontroller and the carrier.
The microcontroller features one chamfered corner which mates with the
corresponding feature in the carrier (facing to the front right of the PCB).
Carefully insert the new microcontroller, observing the polarisation notes above.
Plug the front panel ribbon cable firmly in to the mating connector.
Fig.2
NMH
Compatible
Front Panel
Positioning of the PAG NMH upgrade identification label
viewed from top of charger.
9. Ensure that the front panel is correctly clipped onto the base moulding.
NOTE: It is essential that the central nib on the base moulding is located to the
inside of the front panel.
Position the back panel over the mains supply socket, and replace the charger PCB
assembly in the base, ensuring that the mounting points are correctly engaged
with the PCB.
10. Ensure that the loose spacers (where fitted) are correctly attached to the lid
moulding, and fit the lid. Check that the central nib on the lid moulding is
located to the inside of the front panel.
11. Replace the fixing screws and tighten securely. Fit the new rubber pads into the
foot mouldings.
12. Fix the NMH Upgrade Label to the case in the position shown (Fig. 2).
13. Connect the charger to the mains supply, and check that the display functions
correctly.
14. Place the amendment sheet inside the Instruction Manual.
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