Alpine 7390M - GR Series - Functional Parts Replacement (continued); Head Height Adjustment

GR Series
(4) Adjust the height of the head as shown in
Figures 23, 24 and 25.
@ Place the height adjustment gauge (M-300 or
AT-500) on the head base, and adjust the
height so that the check bar fits in the tape
head guide smoothly.
@ _ When the check bar touches the top (or
bottom) of the tape guide, insert a spacer (t 0.1
mm or polislider washer t 0.13 mm).
If necessary, remove the spacer.
Note: If you do not have a height gauge like
described in @-, run the tape at normal
speed and adjust the height of the head and
the tape head guide so that the tape does
not curl.
Head
Head P.C. board
Figure 22
(5) After having assembied the complete
mechanism, adjust the angle of the head with
test tape MTT-113C. (Refer to chapter
“Adjustment
of
the
head
angie”.)
After
the
adjustment, apply the screw lock and fix the
screws.
Tilting-
90°+30° gle
(NG) (NG) ‘ Head
M-300 or AT-500
Figure 23 gauge
Playback head
weueee TTL TIT TTI
LILLIA
M-300
or
AT-500
Tapehead
of.
ng,
gauge
guide
P
Figure
24
Adjustment screw
Minimum
M-300 or AT-500 gauge
(The gauge must be
inserted smoothly.)
The nosepiece of the gauge must be
between the minimum and maximum
positions.
Maximum
Figure 25