Upper Drum Assembly Replacement - Sony DNW-A100 Maintenance Manual

5-2. Upper Drum Assembly Replacement

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If your hand or screwdriver touches the rotating drum at high speeds, serious injury
may occure.
. Perform cleaning or parts replacement after the drum rotation is completely stopped.
. During adjustment, be very carefull not to touch the rotating drum at high speeds.
As for replacement time, refer to "Section 5. Periodic Maintenance and Inspection"
in Maintenance Manual Part 1.
Outline
Replacement
1. Remove the Video Head Cleaner Assembly
2. Disconnect the Flexible Board (CN2/SE-341 Board)
3. Remove the Brush/Slip Ring Assembly
4. Release the Demagnetization Head Assembly
5. Remove the Height Determing Plate
6. Remove the Upper Drum Assembly
7. Cleaning (Upper Drum Assembly Mounting Surface, Lower Drum Flange
Surface, Tape Running Surface, Lead Surface, and Contacting Points)
8. Attach the Upper Drum Assembly
9. Cleaning (Height Determining Plate's Lower Surface and Upper Surface of
Drum Support)
10. Attach the Height Determing Plate
11. Put the Demagnetization Head Assembly Back
12. Cleaning (DR-294 Board's Contacting Points and Brush/Slip Ring Assembly
Mounting Surface)
13. Attach the Brush/Slip Ring Assembly
14. Connect the Flexible Board (CN2/SE-341 Board)
15. Cleaning (Rotary Heads and Upper Drum's Tape Running Surface)
16. Attach the Video Head Cleaner Assembly
Adjustment after Replacement
17. Confirm the Tape Running (Refer to Section 7-1-2.)
18. Confirm the Video Tracking (Refer to Section 7-1-3.)
19. Confirm the CTL Head Height (Refer to Section 7-1-4.)
20. Adjust the CTL Head Position (Refer to Section 7-1-5.)
21. Confirm the AT Head Height (Refer to Section 7-1-6.)
22. Confirm the AT Head Azimuth (Refer to Section 7-1-7.)
23. Confirm the AT Head Head-to-tape Contact (Refer to Section 7-1-8.)
24. Adjust the AT Head Position (Refer to Section 7-1-9.)
25. Perform the Electrical Adjustments after Drum Replacement
(Refer to Section 6.)
Note
When the rotary head tip was worn or damaged, replace the whole upper drum
assembly. It cannot be replaced only head tip.
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
5-2. Upper Drum Assembly Replacement
5-9