Technical data

METTLER TOLEDO JAGXTREME Terminal Technical Manual
(9/00) 7-20
QWERTY Keyboard Voltage
1. Test the voltages at the keyboard jack on the Controller PCB panel with the
keyboard plug removed. Refer to Figure 5-c.
Test Points Voltage Readings
PIN 1 & PIN 3 5 VDC
PIN 5 & PIN 3 5 VDC
PINS 4 & 3 5 VDC
2. If the voltages are correct and the keyboard still does not work, try connecting
another keyboard.
Backup Battery Test
Disconnect the connector plug from J3 of the power supply PCB and put your voltmeter
leads at pin 1 (+ red) and pin 4 (- black). If your reading is between 3.7 volts and 4.2
volts, the battery should be considered operational.
Ground Test
To confirm ground integrity, a commercial branch circuit analyzer is recommended. This
instrument uses a high amperage pulse to check ground resistance. It measures the
voltage from the neutral wire to the ground connection and will provide an assessment
of the line loading. Instructions with the instrument give guidelines about limits that
assure good connections. Visual inspections and a query of the user will provide
information about equipment sharing the power line.
Using a Volt-Ohm meter to check for excessive voltage between neutral and ground on
the AC input is not suitable to confirm power grounding integrity. In some cases, a
power line conditioner may help to correct adverse power conditions.
External Equipment Test
1. Disconnect all nonessential external equipment and retest the scale.
2. Reconnect one at a time to isolate a problem with peripheral equipment.
3. If the analog scale option is installed, connect an analog load cell simulator to the
I/O port point assigned to this option.
4. Verify that the positive sense is connected to the positive excitation and the negative
sense is connected to the negative excitation.
Figure 5-c: QWERTY Plug Jack and Voltage Chart
If the ground is insufficient, the
JAGXTREME terminal ma
y
lock up
frequently or give unstable weight
readings.
Pin 3
Pin 5
Pin 1
Pin 2
Pin 4
Pin 6