JVC DR-MV2SEU, Service Manual

Page: 35 / 99

(No.YD087)1-35
4.4.2.4 Azimuth Alignment of Audio/Control/ Erase Head
Purpose:
To correct the Azimuth alignment so that the Audio/Control/
Erase Head meets tape tracks properly.
Symptom of Misalignment:
If the position of the Audio/Control/Erase Head is not properly
aligned, the Audio S/N Ratio or Frequency Response will be
poor.
(1) Connect the oscilloscope to the audio output jack on the
rear side of the deck.
(2) Playback the alignment tape (MHPE-L) and confirm that
the audio signal output level is 8kHz.
(3) Adjust Azimuth Adj. Screw so that the output level on the
AC Voltmeter or the waveform on the oscillo scope is at
maximum. (Fig. 6)
Note:
Upon completion of the adjustment of Azimuth Adj. Screw,
check the X Value by pushing the “PR +” or “PR -“buttons on
the unit alternately, to check the symmetry of the envelope.
Check the number of pushes to ensure preset position. The
number of pushes of the “PR +“ button on the unit to achieve
1/2 level of envelope should match the number of pushes of
the “PR -”button on the unit from center. If required, redo the
“X Value Alignment.”
4.4.2.5 Checking and Alignment of Tape Path during re-
versing
Purpose:
To make sure that the tape path is well stabilized during re-
versing.
Symptom of Misalignment:
If the tape path is unstable during reversing, the tape will be
damaged.
Note:
Do not use an Alignment Tape for this proce dure. If the unit is
not correctly aligned, the tape may be damaged.
(1) Insert a blank cassette tape into the tray and set the unit to
REV. Then confirm if the tape has been curled up or bent
at the Take-up Guide Post[4] or REV Post[5]. (Refer to Fig.
11 and 12.)
(2) When the tape has been curled up or bent, turn the align-
ment screw to adjust the height of REV Post.
(Refer to Fig. 11 and 13.)
Fig.11
Fig.12
Fig.13
Take-up Guide Post [4]
REV Post [5]
Take-up Guide
Post
Tape
REV Post
Tape
Correct
Incorrect
Tape Guide
Assembly
Alignment
Screw