Laser Current Measurement - Bose AV28 Manual

Digital Audio
Connector

Laser Current Measurement

1. Turn on the media center and insert a
current and a CD when measuring the CD laser current.
2. Measure and record the voltage at the points 5V and L5V referenced to the ground shown in
figure 6.
3. Subtract L5V from 5V (5V-L5V) and record the laser voltage (LmV).
LmV/1 Ohm equals laser current (LC).
4. The measured laser current value should be ± 20% of the printed current rating on the pickup
head (PU). PU- .20PU < LC <PU + .20PU. Refer to figure 6 for the location of the laser current
rating. If the value is out of range, and the lens has been cleaned, replace the DVD/CD assembly.
Laser Current Measurement
Mode Select
Analog Audio
Headers
Connector
CSEL
GND
DIGITAL
R L
OUT
SLAVE
GND
MASTER
Figure 5. DVD Player Rear Panel
Figure 6. Laser Current Measurement Point
disc.
ATAPI Interface Power Supply
Connector Connector (4P)
GND
+5V
1
Insert a DVD when measuring the DVD laser
62
+12V