0F1 Control Panel RAP
NOTE: Refer to BSD 2.1 while using this
RAP, unless otherwise directed
This RAP is used when the Control Panel
does not operate, or when the Control Panel
operates incorrectly.
Initial Actions
• Make sure that ac power is applied to the
machine.
• Ensure that the 26-conductor ribbon cable,
connected between the Main PWB
A3J301 and the User Interface PWB
A32J1 (located in the Control Panel), is
seated fully at each connector.
Procedure
Refer to Table 1.
Table 1. Control Panel Probable Cause / Corrective Action
Control Panel
The Message Display is
blank, no characters are
displayed.
The Message Display
LEDs are on but,no
characters are displayed.
The Message Display
LEDs are on but no
characters, random
characters, or black
squares appear.
Probable Cause
a) There is no +5 VDC to
the Main PWB, A3.
b) There is an open circuit in
the ribbon cable between
the Main PWB A3J301
and the User Interface
PWB A32J1.
c) There is an internal fault
in the Control Panel or in
the Main PWB A3.
a) There is no +15 VDC to
the Main PWB, A3.
b) There is no +5 VDC
(Bulk) to the Main PWB,
A3.
a) There is an open circuit in
the ribbon cable between
the Main PWB A3J301
and the User Interface
PWB A32J1.
b) There is an internal fault
in the Control Panel or in
the Main PWB A3.
Corrective Action
a) Refer to BSD 1.2 to troubleshoot
the +5 VDC power to the Main
PWB, A3.
b) Check for continuity in all wires in
the ribbon cable.
c) Replace the Control Panel, PL
1.4. If the problem persists,
replace the Main PWB, A3, PL
1.1.
a) Refer to BSD 1.2 to troubleshoot
the +15 VDC power to the Main
PWB, A3.
b) Refer to BSD 1.2 to troubleshoot
the +5 VDC (Bulk) power to the
Main PWB, A3.
a) Check for continuity in all wires in
the ribbon cable.
b) Replace the Control Panel, PL
1.4. If the problem persists,
replace the Main PWB, A3, PL
1.1.
8830
1/98
2-13
OF1 Control Panel RAP
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