User's Manual

Page 49
Extech Data Systems
Testing Power and Charging Circuits for MPP III Printer
Test all printers, before returning to Extech, using the following procedure. This will ensure the
fault is with the printer and not some other part of your system.
§ Install a fully charged battery (measuring 5.45 VDC)
§ To ensure a fully charged battery, we recommend you purchase a battery
charger from us (Part # 767500, cost $150.00). The battery charger trickle
charges 4 batteries at a time.
§ Press <OFF> switch and wait until all lights are off
§ Press and hold the <FEED> switch and then insert AC adapter plug into
printer. The printer will print a self test receipt (similar to AC test strip below)
Ÿ To test the AC adapter use a multimeter and measure output (output
must be > 12.5V)!
Ÿ If the amber charge light goes on the battery is not fully charged, but
charge circuit is OK
If the receipt is printed, AC power is OK
§ Release <FEED> and remove the AC adapter plug from the printer.
§ Press <FEED> switch and while continuing to press <FEED>, press <ON>.
The printer will print a self test receipt (similar to DC test strip below).
Release <FEED> and <ON> when receipt starts to print
If a self test receipt is generated, DC power is OK
§ Press <OFF> and wait until all lights are off
§ Plug AC adapter into printer. Press <ON>; the green ON-LINE light
illuminates and after 20 seconds the red STATUS light should flash, the
green AC-ON light is illuminated and the ON-LINE light goes off. After 20
seconds all lights go off
Ÿ If the CHARGE light is on, this will continue on through this test
§ Remove battery and replace it with a low power battery (around 5.1
VDC)
§ Insert AC adapter plug into printer