Alpine 7279M - Page 48

GT SERIES
5. Replacement of Head
(1) Remove two screws marked “ %”
Figure 1.
(2) Remove two screws marked
Figure 8.
(3) Remove two screws marked “PI” and the head
flexible P. C. Board can be removed as shown in
Figure 4. Then remove the P. C. Board.
(4) Replace with a good head and assembly them using
above steps in reverse order.
(5) After assembling, adjust the head azimuth using
the test tape (MTT-114NB). Apply the screw-lock
paint on the adjusting screws.
Note: Since the flexible P. C. Board is apt to be
damaged, handle it with sufficient care.
Perform the head height adjustment.
(6) Place the height adjustment gauge (M-300 or AT-
500) on the head base as shown in Figures 5,
6 and 7, and adjust the gauge height so that the
check bar can enter the tape head guide smoothly.
(7) When the check bar touches top or bottom guide
of the tape guide, insert a spacer (of 0.1mm
thickness or a polyslider washer of 0.13mm in
as shown in
“TE” as shown in
thickness). (Or remove the spacer to adjust the
height).
Note: As shown in Figure 6, if the height gauge
is not available, run a tape as usual and
adjust the height (head and small guide
so. that
window ) no tape curling is
observed.
6. Replacement fo Pinch Rollers
(1) Remove RF Frame Bracket.
(2) Remove two lock washers and two pinch roller
springs and the pinch rollers can be removed as
shown in Figure 4.
(3) Replace with good pinch rollers and clean them
with alchol and assembly it using above steps in
reverse order.
(4) After assembling, confirm the tape speed and wow-
flutter with the test tape (MTT-111).
7. Replacement of Metal Switch P. C. Board
(1) Remove a screw marked “ A” in Figure 1.
Note: Since the wire parallel is apt to be damaged,
handle it with sufficient care.
(2) Replace the board with a good one and assembly
the board using above steps in reverse order.
Lock Washer
Assy., Pinch Roller
Pack Guide Roller
Pinch Roller Spring
PB) (Azimuth
Adjustment Side)
Pinch Roller Spring
Lock Washer Assy., Pinch Roller
(GT75B Series model only) Figure 4
Lock Washer
;
Assy.,
Pinch
Roller
Pack
Guide
Roller
Lock Washer
(GT75L010,/GT75L110 models only) Figure 4
Lock Washer
Pack Guide Roller
Pinch Roller Spring
Playback
Head P) (Azimuth
Adjustment Side)
MW) (Fixed Side)
Pinch Roller Spring
Assy., Pinch Roller
(GT75L220 model only) Figure 4