Testing - Sony DVP-NS300 Training Manual

RF, Focus-Tracking Servo, Optical Assembly
The service or test mode permits us to repeat a signal so we can see it on the scope and verify its operation. In
the first test, a YEDS-18 CD test disc was used to check focus and optical assembly detectors by looking at the
PI and FE signals.
Entering the Service / Test Mode
1. Using the remote, press these buttons: TITLE, CLEAR, then POWER.
2. From the test menu, select "Drive Manual Operation"; select "Disc type"; select the disc type in the unit.
3. From the "Drive Manual Operation" menu, select "Servo Control"; turn on "1.LD" and 7.FCS.Srch.
4. Connect the CH1 scope probe to "PI" and the CH2 probe to "FE".
Testing - Focus
After using the service mode to repeat one time operations, the focus, tracking and RF signal levels can be
monitored. Figures 5-1 to 5-4 show normal servo operation.
Figure 5-1 - CD Focus error showing balanced A-D detectors.
(FE is equal above and below center). The 1
When a CD is played back (YEDS-18).
The Player is in service mode „CD".
56 ms
Figure 5-3 - DVD Focus Error of a Dual Layer (DL) disc. Two FE signals
of equal amplitude mean both layers can be identified.
A DVD dual layer is played back (HLX-501). S-Curve: max. 1,6 Vpp
The player is in service mode „DVD-DL".
Chapter 5 - Testing
st
PI pip occurs at disc entry.
S-Curve: 1,5 Vpp
PI-Level: 1 Vp
PI
FE
PI-Level: 1 / 0,8 Vp
26 ms
PI
FE
Figure 5-2 - DVD Focus Error showing same detectors are still balanced at the
higher DVD laser frequency. Balanced FE means faster recovery after disturbance
A DVD single layer is played back (HLX-503).
The player is in service mode „DVD-SL".
Figure 5-4 - Hybrid SACD Focus error and PI level shows three pips. 1 = disc
surface entry, 2 = HD layer, 3 = CD layer an equal distance away (28 ms).
When a hybrid disc is played back.
Player is service mode „LCD".
28 ms
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5. Testing

S-Curve: 1,5 Vpp
PI-Level: 1 Vp
28 ms
PI
FE
S-Curve: approx. 0,5 / 2,5 Vpp
PI-Level: approx. 0,8 / 2,3 Vp
28 ms
PI
FE