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6.5 CHECKING THE GRATING AFTER CHANGING THE PICKUP UNIT
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• Note :
The grating angle of the PU unit cannot be adjusted after the PU unit is changed. The PU unit in the CD mecha-
nism 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
B
track search operations, or taking a long time for track searching.
• Method :
• Measuring Equipment
• Measuring Points
• Disc
• Mode
C
TE
L 13942296513
D
REFO
• Checking Procedure
1. In test mode, load the disc and switch the 5V regulator on.
2. Using the SEEK UP and SEEK DOWN buttons, move the PU unit to the innermost track.
Using the DISC UP and DISC DOWN 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 adjust-
ment the display should now read "81". Press key 3 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 differ-
ence 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
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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 aver-
age angle.
• Hint
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Reloading the disc changes the clamp position and may decrease the "wobble".
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• Oscilloscope, Two L.P.F.
• E, F, REFO
• ABEX TCD-784
• TEST MODE
CONTROL UNIT(G2T)
E
F
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FX-MG9427ZT/ES
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L.P.F.
Xch
E
100kΩ
Q Q
3
6 7
390pF
REFO
F
100kΩ
390pF
REFO
L.P.F.
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3
4
2 9
9 4
8
Ych
Oscilloscope
1 3
1 5
0 5
8
2 9
(FX-MG9427ZT,MG9527ZT)
(FX-MG9327ZT)
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co
.
4
2 8
9 9
9 4
2 8
9 9
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