Xerox 5915, Service Manual, Page: 140 / 146

9-8
Section 9 BSD (Block Schematic Diagram)
3.2 OPTICS
U2-1 LAMP CARRIAGE FAIL - STANDBY
Lamp carriage fails to activate optical registration sensor for 6.5 sec during standby.
U2-2 LAMP CARRIAGE FAIL - POSITION
Case 1: Optical registration sensor fails to turn on within 0.65 sec at lamp carriage initialization after end of copying.
Case 2: Optical registration sensor fails to turn off within 0.65 sec at start of copy.
U2-3 LAMPCARRIAGE FAIL-SCAN
Optical registration sensor fails to turn on within 0.46 sec after lamp carriage initiated scanning.
U2-4 LAMP CARRIAGE FAIL - RETURN
Optical registration sensor fails to turn on within 2.5 sec after lamp carriage initiated return.
U3-1 LENS POSITION FAIL
Lens sensor fails to turn on within 3.1 sec after lens initialization was initiated (start of movement).
U8-1 EXPOSURE CONTROL FAIL
Control mode is not set within 0.5 sec after exposure lamp turned on.
U8-4 EXPOSURE VOLTAGE OVER FAIL
Voltage level of exposure signal intensity level already exceeds 2.9 V when exposure lamp turns on.
U8-5 EXPOSURE VOLTAGE UNDER FAIL
Voltage level of exposure signal intensity level is already below 0.5 V when exposure lamp turns on.
Test
data
No.
Signal name
Measurement
point
Measurement method Reference value
1
EXPOSURE LAMP
TERMINAL VOLTAGE
P/J16-1
⊕
P/J16-2
•
Enter diag code [6-7]
•
Start a copy cycle in normal mode.
100VAC
60-70VAC
2
EXPOSURE LAMP
STARTING SINGNAL
P410-12
⊕
COM
Enter diag code [6-7] measure
ON: +10.2VDC
OFF: 22.3VDC
3
LAMP VOLTAGE MONITOR
SIGNAL
Enter diag code [6-7] and then [6-8] to check A/D value
A/D VALUE: B4 to B6
(reference: +19VDC)
4
LAMP CARRIAGE MOTOR
ON 24V CLOCK
J605-3,4,5,6
⊕
COM
Enter diag code [6-3] or [6-4] and
measure ON: +24.0VDC
OFF: +24.5VDC