|
|
|
Who's Online
There currently are 5948 guests online. |
|
Categories
|
|
Information
|
|
Featured Product
|
|
|
 |
|
|
There are currently no product reviews.
 ;
excellent work as always you do cheap, fast net and clean. you do an incredible service......thanks!
;
Great Job even clear than the one before!!!! god organization- I'm always very satisfied
;
I'm very happy that you all are performing an incredible good job. Furthermore what you did is very useful for all people as me that have electronics as an hobby.Thank you!!!!!
;
Manual found fast and good quality, very helpfull service
;
8-17-12 Been using the sight for about 6 months. Fast Downloads and top quality
Manuels !
5
6
7
8
6.2 CHECKING THE GRATING AFTER CHANGING THE PICKUP UNIT
A
� Note : The grating angle of the PU unit cannot be adjusted after the PU unit is changed. The PU unit in the CD mechanism module is adjusted on the production line to match the CD mechanism module and is thus the best adjusted PU unit for the CD mechanism module. Changing the PU unit is thus best considered as a last resort. However, if the PU unit must be changed, the grating should be checked using the procedure below. � Purpose : To check that the grating is within an acceptable range when the PU unit is changed. � Symptoms of Mal-adjustment : If the grating is off by a large amount symptoms such as being unable to close tracking, being unable to perform track search operations, or taking a long time for track searching. � Method : � Measuring Equipment � Measuring Points � Disc � Mode
B
� Oscilloscope, Two L.P.F. � E, F, REFO1 � TCD-782 � TEST MODE
CD CORE UNIT(S10.5COMP1)
C
REFO1 E VREF L.P.F. Xch 100k� Ych
E F
Oscilloscope
390pF
F VREF
100k� 390pF L.P.F.
D
� Checking Procedure 1. In test mode, load the disc and switch the 3V regulator on. 2. Using the � and � buttons, move the PU unit to the innermost track. 3. Press key 3 to close focus, the display should read "91". Press key 2 to implement the tracking balance adjustment the display should now read "81". Press key 3. The display will change, returning to "81" on the fourth press. 4. As shown in the diagram above, monitor the LPF outputs using the oscilloscope and check that the phase difference is within 75° . Refer to the photographs supplied to determine the phase angle. 5. If the phase difference is determined to be greater than 75° try changing the PU unit to see if there is any improvement. If, after trying this a number of times, the grating angle does not become less than 75° then the mechanism should be judged to be at fault. � Note Because of eccentricity in the disc and a slight misalignment of the clamping center the grating waveform may be seen to "wobble" ( the phase difference changes as the disc rotates). The angle specified above indicates the average angle. � Hint Reloading the disc changes the clamp position and may decrease the "wobble".
E
F
DEH-P680MP/XN/UC
5 6
7
8
55
|
|
|
> |
|
