Preva Installation/Service Manual, 00-02-1577, Revision E01
76
Responsibilities of the Installer and Service Engineer
Verification of machine performance after installation must be performed
according to the guidelines identified in the “System Function Checklist” which
can be found on page 56.
Verification of machine performance after maintenance or repair must be
performed according to the guidelines identified in the “System Function
Checklist” and the calibration instructions which can be found on page 56.
Display but
Power Switch is
ON
1. On the Power Supply Board 30-08041, check for the presence of 100 to 230
volts AC at J4, the Input Power Terminal Strip, as shown in Figure 54. If
power is absent, check that the Preva is connected to line power.
2. On the Power Supply Board 30-08041, measure incoming power at J3, the
Line Switch Connector, as shown in
Figure 54. Positions 2 and 4 carry the
line voltage before the Line Switch, and positions 1 and 3 carry the line
voltage after the Line Switch. Voltage at the input side of the switch, but not
at the output, requires replacement of the Line Switch E1-19000.
3. Inspect the condition of the communication cable between the Logic Board
and the Operator Panel. Midmark includes two communication cables with
each Preva system. Should the installed communication cable be suspect,
temporarily substitute the other cable as a test tool.
4. If the power switch is on and there is no operator display and a faint buzzing
sound is also detected, check the ribbon cable installed between the Power
Supply Board and the Logic Board. If the cable is not properly seated,
reinsert it. If it is damaged, replace the cable.
5. On the Logic Board, measure voltages at TP1 (+8.1V) and TP9 (+24V). Use
TP8 or TP10 as Common Return. If any of these voltages are not present
after power is applied, next check voltages on the Power Supply Board.
6. On the Power Supply Board, use TP2, as a common test point, and check
TP1 +24 volts DC and TP3 8.1 volts DC, as shown in
Figure 54. Then use
TP5 as the common return to check TP4 for the presence of +12 volts DC.
Should any of these voltages not be present, replace the Power Supply
Board. If each voltage is present, inspect the condition of the ribbon cable
between the Power Supply Board and the Logic Board. If the cable is
undamaged and seated properly, replace the Logic Board.
7. If the power supply voltages are present, and the ribbon cable and
communication cable are found acceptable, open the Operator Panel case
and measure for the presence of +5 volts DC across TP1 and TP4 of the
Operator Panel Board, as shown in
Figure 56. Absence of this voltage
indicates the need to reconfirm the power supply voltages and
communication cable. Presence of the voltage requires the replacement of
the Operator Panel Board.
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