There are currently no product reviews.
is part of the manual is very useful for repairing
Here are circuit diagrams
if there is damage, I recommend using this part of the
a complete list of circuit boards and components
This paper enable me, to bring this lovley Scope into Function.
Without this Page, i have no cance to make this finish.
Hans M. Knoll Germany
I used for first time this the wheat and am very thanked
This manual was exactly what i needed and could not find elsewhere. Price is not too high. Great !
ecelent I was reciver the service manual soon I fell so happy very complete 100% positive all by this store tanks atte Luis salazar
6.3 CHECKING THE GRATING AFTER CHANGING THE PICKUP UNIT
â¢ 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.
â¢ Purpose : To check that the grating is within an acceptable range when the PU unit is changed. â¢ 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. â¢ Method : â¢ Measuring Equipment â¢ Measuring Points â¢ Disc â¢ Mode
â¢ Oscilloscope, Two L.P.F. â¢ E, F, REFO â¢ ABEX TCD-784 â¢ TEST MODE
L.P.F. E REFO 100kâ¦ 390pF Xch Ych
F REFO L.P.F. 100kâ¦ 390pF
â¢ Checking Procedure 1. In test mode, load the disc and switch the 5V regulator on. 2. Using the TRACK UP and TRACK DOWN buttons, move the PU unit to the innermost track. 3. Press key RANDOM to close focus, the display should read "91". Press key FF to implement the tracking balance adjustment the display should now read "81". Press key RANDOM 4 times. 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 75Â° . Refer to the photographs supplied to determine the phase angle. 5. If the phase difference is determined to be greater than 75Â° 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 75Â° then the mechanism should be judged to be at fault. â¢ 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. â¢ Hint Reloading the disc changes the clamp position and may decrease the "wobble".
5 6 7 8