Signal Nomenclature; Voltage Measurement And Specifications; Logic Voltage Levels; Dc Voltage Measurements In Raps - Xerox WorkCentre 5222 Service Manual

Signal Nomenclature

Refer to Figure 7 for an example of Signal Nomenclature used in Circuit Diagrams and BSDs.
Figure 7 Signal Nomenclature

Voltage Measurement and Specifications

Measurements of DC voltage must be made with reference to the specified DC Common,
unless some other point is referenced in a diagnostic procedure. All measurements of AC volt-
age should be made with respect to the adjacent return or ACN wire.
Table 1 Voltage Measurement and Specifications
VOLTAGE SPECIFICATION
INPUT POWER 220 V 198 VAC TO 242 VAC
INPUT POWER 100 V 90 VAC TO 135 VAC
INPUT POWER 120 V 90 VAC TO 135 VAC
+5 VDC +4.75 VDC TO +5.25 VDC
+24 VDC +23.37 VDC TO +27.06 VDC

Logic Voltage Levels

Measurements of logic levels must be made with reference to the specified DC Common,
unless some other point is referenced in a diagnostic procedure.
Table 2 Logic Levels
VOLTAGE H/L SPECIFICATIONS
+5 VDC H= +3.00 TO +5.25 VDC
L= 0.0 TO 0.8 VDC
+24 VDC H= +23.37 TO +27.06 VDC
L= 0.0 TO 0.8 VDC
Launch Version
WorkCentre 5225, 5230

DC Voltage Measurements in RAPs

The RAPs have been designed so that when it is required to use the DMM to measure a DC
voltage, the first test point listed is the location for the red (+) meter lead and the second test
point is the location for the black meter lead. For example, the following statement may be
found in a RAP:
There is +5 VDC from TP7 to TP68.
In this example, the red meter lead would be placed on TP7 and the black meter lead on TP68.
Another example of a statement found in a RAP might be:
There is -15 VDC from TP21 to TP33.
In this example, the red meter lead would be placed on TP21 and the black meter lead would
be placed on TP33.
If a second test point is not given, it is assumed that the black meter lead may be attached to
the copier frame.
February, 2008
vii
Introduction