Sharp DV-NC150U Service Manual page 94

1. Tape Interchangeability Alignment
Note:
To do these alignment procedures, make sure that the Tracking Control Circuit is set to the preset position every time
a tape is loaded or unloaded. (Refer to page 2-3-4, procedure 1-C, step 2.)
Equipment required:
Dual Trace Oscilloscope
VHS Test Tape (9HSFL8NW) (Refer to "SERVICE FIXTURE AND TOOLS" section.)
Guide Roller Adj. Screwdriver
Flat Screwdriver (Purchase Locally)
Note: Before starting this Mechanical Alignment, do all Electrical Adjustment procedures.
Flowchart of Alignment for tape traveling
Loading (Use a blank tape.)
Adjust the height of the Guide Rollers
(Supply side and take-up side).
(Use a blank tape.) (Page 2-3-3)
Check to see that the tape is not creasing
and that there is no slack on the supply
and take-up side Guide Rollers.
(Use a blank tape.)
Adjust the X Value for maximum envelope.
(Page 2-3-3) (Use Alignment Tape.)
Adjust the envelope. (Page 2-3-4)
Check the envelope.
OK
Adjust the Audio Section.
(Azimuth Alignment) (Page 2-3-4)
Check the audio output.
OK
Check the following:
1. X Value (Page 2-3-3)
2. Envelope (Page 2-3-4)
OK
1-A
1-A
1-B
1-C
No good
1-C
1-D
No good
1-D
No good
1-B, 1-C
2-3-2
No good
Do the final tape-traveling test to see that
the tape runs normally in play mode with-
out creasing or slacking.
OK
Check to see that the tape is not creasing
and that there is no slack on the REV Post.
(Use a blank tape.)
OK
Completion
Adjust the X value and envelope.
1-A
1-E
1-B, 1-C
H9745MA