Xerox WorkCentre Pro 423 Service Manual page 540

9.1 Overview
9.1.1 How to Use the BSD
1. Enter the chain indicated in "Section 2
Troubleshooting."
2. Another method of entering the chain is
to see Contents.
3. In the chain you have entered, analyze
the test data and problem.
4. Once the fault has been located, check
the parts list (PL) number or adjustment
(ADJ) number and go to the part indexes
or the specified ADJ section.
WARNING
Disconnect the power cord from the outlet
while performing any tasks that do not need
electricity. Contact with electricity can cause
death or injury..
9.1.2 Reference Symbology
This symbol usually refers to a note on the
same page.
1
This symbol refers to a parts list.
3/
represents Parts List and "7.7" represents
a plate number to indicate that the part
information is given on the specified plate.
This symbol is added to every replaceable
part on the BSD.
This symbol refers to an adjustment
procedure in "Section 4
Adjustment Procedures." "7.7.1" means
that the necessary adjustment procedure
is given in 7.7.1.
This symbol represents a variable resistor
that can be adjusted in field.
This symbol represents a signal test point.
WorkCentre Pro 423/428
This symbol indicates where the input to
the function comes from. "1.3" indicates
that the input comes from group function 3
of chain 1.
This symbol indicates where the output
from the function is going e.g. "6.1"
indicates that the output is going to group
function 1 of chain 6.
This symbol indicates that the signal line is
connected vertically.
This symbol indicates that the signal line is
connected horizontally.
This symbol indicates that the signal line is
connected within the same function.
"ZONE E3" means that the destination of
the signal line is indicated in zone E-3.
This symbol indicates that the signal line is
connected within the same function.
"PL" "ZONE A4" means that the source of the
signal is indicated in zone A-4.
This symbol indicates that the signal line is
connected to another sheet (written in the
lower right corner of the BSD). "CH8.5 ZN
A2" means that the destination of the
signal line is indicated in CH8.5 zone A-2.
Repair/
This symbol indicates that the signal line is
connected to another sheet (written in the
lower right corner of the BSD). "CH8.5 ZN
H4" means that that the source of the
signal line is indicated in CH8.5 zone H-4.
This symbol represents the output power
line of Chain 1.
This symbol indicates that the signal flows
in the opposite direction, from left to right.
This symbol represents a feedback signal.
This symbol represents a mechanical
connection to a part.
This symbol identifies a mechanical drive
signal and indicates the signal direction.
This symbol identifies a document or
paper and indicates the signal direction.
This symbol identifies a heat, light, or air
signal and indicates the signal direction.
This symbol indicates that the part pointed
by this symbol has been changed by the
tag number within the circle.
This symbol indicates that the part pointed
by this symbol has not yet been changed
by the tag number within the circle.
This symbol indicates that the whole part
or only the framed part of the illustration
has been changed by the tag number
within the circle.
This symbol indicates that the whole part
or only the framed part of the illustration
has not yet been changed by the tag
number within the circle.
03/02
9-3 CHAPTER 9 BSD (Block Schematic Diagrams)
9.1.3 Signal Name Designation
Signal Name Composition
REGI SENSED (L) +5VDC
SENSOR
Parts name Operating Logical Voltage at
status value high signal
level (H)
This signal goes low (L) when the registration
sensor detects paper, and it goes high (H) (+5
VDC) when the registration sensor does not
detect paper.
9.1.4 DC Voltage
Measure the DC voltage between each
test point and the frame unless specified in
Note. DC voltage ranges are as follows:
+5VDC + 4.5 to + 5.3VDC
±12VDC + 11.0 to + 12.6VDC
+24VDC + 22.0 to+ 25.7VDC
Overview