Replaceable Parts
Assembly and Disassembly Guidelines
HP EPM-441A/442A Service Guide 5-13
Removing the Power Meter Battery (BT1)
1. Remove the A2 processor assembly as described on page 5-9.
2. Remove the A2J1 link to disconnect the battery from the rest of
the circuitry.
3. Verify the battery protection circuitry by:
■ ensuring that there are no electrical short circuits across the
battery terminals.
■ ensure that there are no voltages present which could apply a
charging voltage.
4. Once the protection circuit has been verified remove the battery.
The battery is siliconed to the assembly. It may be necessary to
remove it using a scalpel.
5. Store the battery individually in an anti-static (dissipative) bag or
suitable non-conductive packaging.
6. After replacing the battery secure it using a tie wrap. This should
be secured from the top of the A2 processor assembly. The
recommended tie wrap part number is 1400-1154.
7. Replace the A2J1 link.
WARNING This power meter uses a lithium battery which may
explode if mishandled. The battery should not be subjected
to short circuit of the battery terminals or to excessive
heat.
Do not recharge this battery or dispose of it by burning.
Check local country regulatory requirements on the
disposal of lithium batteries.
4402serv.book Page 13 Monday, March 11, 2002 11:34 AM
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