3.1.2
Internal Test Count
This test allows you to see more detail on the scale’s internal resolution than you can see on the weight and
counting display. It may allow you to tell if there is a problem with the load cell being misaligned or if something
is rubbing against a load cell during weighing operations. If the scale constantly does not return to zero during
weighing, you can also rezero the internal counting using this procedure.
1. From the Stand-by screen, press the
MODE
key until the display shows
SERVICE MODE
. The Z
annunicator, indicating that you are in the Service Mode, illuminates.
2. While holding down the
REZERO
key, press
009
to start the Internal Count test. The scale display shows
the results of the test:
If the number on the left is not returning to zero, press the
REZERO
key. Place a weight on the scale
platform. If the scale does not respond quickly and repeatedly by increasing the counts when you place a
weight on the scale, you may want to check the load cells.
3. Press the
TARE
key to return to the
SERVICE MODE
. Then press the
MODE
key twice to return to the
Stand-by screen.
3.1.3
Span Switch Status Test
From the Stand-by screen, press the
MODE
key until the display shows
SERVICE MODE
. The Z annunicator,
indicates that you are in the Service Mode and illuminates.
1. While holding down the
REZERO
key, press
284
to display the Span Switch status. The scale display
shows the current status of the Span Switch.
2. Press the
TARE
key to return to the Service Mode. Then press the
MODE
key twice to return to the Stand-
by screen.
3.1.4
Voltage Checkpoints
There are four voltage checkpoints on the main board. Below are listed the reference voltage levels commonly
used.
The tolerance of all the voltages shown is about ± 5%, except V
TH
which is +2% and -5%.
Voltage Point
Voltage
Purpose
V
cc
5.0 V
Provides voltage for most of the IC
V
TH
24 V
Provides voltage primarily to the thermal print head
V
BB
(off state)
2.5 V
Provides backup voltage for the RAM IC when the power is off
V
BB
(on state)
4.5 V
Provides backup voltage for the RAM IC when the power is on
Table 3-1. Voltage Checkpoints
All manuals and user guides at all-guides.com
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