620UK-B Operation and Maintenance Manual – Rev J – January 2020
Page 17
13231 Rooster Springs Rd.
Austin, TX 78737
T:
(512) 858-4045
E:
amptec.com
Removing the PCB from the 620UK-B
meter will void the product’s warranty and
calibration. The following procedure can
be performed to remove the PCB from the
620UK-B meter:
1) Use a Philips screwdriver to remove
the 620UK-B’s 4 front panel screws
located in the corners.
2) Pull the front panel forward carefully
and slowly.
3) Slide out the display PCB. Use
caution with doing this, as there are
4 wires (battery supply positive and
negative, and 2 DVM sense wires)
and a single ribbon cable (going to
the display PCB) that connect the
front panel electronics to DVM PCB
circuitry mounted inside the case.
4) Slide out main PCB.
5) Disconnect all wires and cables that
go to the faulty PCB.
6) Reinstall all wires and cables onto
the new PCB.
7) Follow the calibration procedure in
section E-7 on page 15.
8) Slide the main PCB back in, and
replace the front panel and screws.
E-9 Battery Compartment Design and
Description
The metal battery compartment is powder
coated to make it chemically resistant to
battery leakage, and backed with a water tight rubber based compression gasket liner.
The battery supply wiring insulation is made of extra thick (> 5mm) Teflon to provide
excellent resistance to abrasion. Since the batteries are in a separate compartment
where the operator has no access to the unit’s internal electronics, any user may
replace the batteries as needed and this activity does not interfere with the unit’s
warranty or calibration.
E-9.1 Battery Replacement
To replace the batteries, you must remove the two retaining screws securing the battery
compartment cover plate on the rear panel. In order to be UL-913 compliant, the
batteries must be AA alkaline (1.5 VDC) type Duracell MN1500. Do not mix battery
batches or brands for any reason. Make sure to replace all four batteries at the same
time, and re-secure new batteries with a plastic cable tie or similar fastener.
Note that the below diagram is of the
620LK meter. However, the 620UK-B
meter is identical in function and design,
and as such the diagram is accurate.
