Description Of Service Modes; Error Rate - Canon DC10 E Service Manual

4. Description of Service Modes

4-1 Error Rate

<Outline>
(1) An error rate is calculated from an error correction factor of digital data read out of the disc concerned. The playback performance
can be checked of the sector corresponding to the calculated error rate.
(2) The error rate may vary depending on the disc condition, performance of pickup unit (tracking, focusing, laser), and performance
of the RF circuit, etc.
(3) The lower the error rate gets, the better the playback performance gets.
Poor image quality Good image quality
∗.∗ × 10
−2
<
<How to output an error rate>
By the operation in step 1 below, an error rate can be output during playback.
ST EP PROCEDURE
1 1) Make setting shown at right.
2) Perform storing.
(Press the PAUSE button.)
* It takes 7 to 20 seconds to indicate an error rate, because it is calculated from large amount of data.
* To measure an error rate again, it is once required to stop the playback.
* Unlike measurements of DVCs, an audio-only error rate is not available.
<How to read an error rate>
Example) '0324' is indicated:
Error rate = 3.2×10
∗.∗ × 10
−4
CS Function ADDR MODE
0 05
• ª •
-4
Fig. 9
MONIT OR
Microcomputer operation
DT
0001 ST 00 • ¨ 01 Product setting.
RD 00 Error rate indication.
ª • ª
3.2
Error rate indication
7
DC10 E, DC20 E
SERVICE MODE / ADJUSTMENT
0 3 2 4
-4
× 10
Fig. 8