81
FH-P6600R,P6600
•
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
• Oscilloscope, Two L.P.F.
• Measuring Points
• E, F, REFO
• Disc
• ABEX TCD-784
• Mode
• TEST MODE
•
Checking Procedure
1. In test mode, load the disc and switch the 5V 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
2 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 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".
F
REFO
E
100k
Ω
390pF
100k
Ω
390pF
E
REFO
F
REFO
L.P.F.
L.P.F.
CONTROL UNIT
Xch
Ych
Oscilloscope
6.3 CHECKING THE GRATING AFTER CHANGING THE PICKUP UNIT
Summary of Contents for FH-P6600 ES
Page 5: ...5 FH P6600R P6600 8 9 10 11 13 1 2 4 3 12 17 18 14 5 16 15 7 6 2 2 PACKING FH P6600 ES ...
Page 7: ...FH P6600R P6600 7 2 3 EXTERIOR ...
Page 8: ...8 FH P6600R P6600 ...
Page 12: ...12 FH P6600R P6600 2 4 CD MECHANISM MODULE ...
Page 14: ...14 FH P6600R P6600 2 5 CASSETTE MECHANISM MODULE ...
Page 25: ...25 FH P6600R P6600 5 6 7 8 A B C D 5 6 7 8 B KV1410 23 ...
Page 27: ...27 FH P6600R P6600 5 6 7 8 A B C D 5 6 7 8 B KV1410 23 ...
Page 28: ...28 FH P6600R P6600 A CN857 A CN856 A 1 2 3 4 B C D 1 2 3 4 C 3 5 POWER SUPPLY UNIT ...
Page 29: ...29 FH P6600R P6600 ES RCA CORD C POWER SUPPLY UNIT 5 6 7 8 A B C D 5 6 7 8 C ...
Page 30: ...30 FH P6600R P6600 PTY D FUNC TAPE CN1102 CN1201 F E A 1 2 3 4 B C D 1 2 3 4 D 3 6 FLAP PCB ...
Page 39: ...39 FH P6600R P6600 ...
Page 44: ...44 FH P6600R P6600 E E E E E E IC Q FOPN FEJ FCLS A 1 2 3 4 B C D 1 2 3 4 A A AUDIO AMP UNIT ...
Page 45: ...45 FH P6600R P6600 E E E E E E E 5 6 7 8 A B C D 5 6 7 8 A SIDE B ...
Page 46: ...46 FH P6600R P6600 A 1 2 3 4 B C D 1 2 3 4 4 2 FM AM TUNER UNIT B SIDE A B FM AM TUNER UNIT A ...
Page 47: ...47 FH P6600R P6600 1 2 3 4 A B C D 1 2 3 4 B FM AM TUNER UNIT B SIDE B ...
Page 49: ...49 FH P6600R P6600 E E E RCA CORD CN857 A IC Q 5 6 7 8 A B C D 5 6 7 8 C SIDE A ...
Page 50: ...50 FH P6600R P6600 E E E E E IC Q A 1 2 3 4 B C D 1 2 3 4 C C POWER SUPPLY UNIT ...
Page 51: ...51 FH P6600R P6600 E E E E E E E E E 5 6 7 8 A B C D 5 6 7 8 C SIDE B ...
Page 57: ...CLAMP 57 FH P6600R P6600 1 2 3 4 A B C D 1 2 3 4 G SIDE B CONTROL UNIT S8TX G ...
Page 82: ...82 FH P6600R P6600 Grating waveform Ech Xch 20mV div AC Fch Ych 20mV div AC 45 0 75 60 30 90 ...
