7-8
DSR-80/80P/60/60P
7-4. TAPE PATH ADJUSTMENT
(CHECKING AMOUNT OF TAPE CONTACT WITH TOP FLANGES AT ENTRANCE SIDE)
Required tools
Alignment tape XH2-1AST
: 8-967-999-02
Tape guide adjustment driver
: J-6440-850-A
Dental mirror
: J-6080-029-A
Dual trace oscilloscope
Nutdriver (width across flat 4.5 mm) : 7-700-751-01
Check procedure
1. Connect an oscilloscope as follows:
CH-1 :
TP104/RP-103 board (D-1)
TP302/RP-101 board (D-1)
CH-2 : TP207/SV-184 board (F-1)
TRIG : CH-2
2. Set the alignment cassette XH2-1AST (standard cassette) on the VTR and place a weight on a cassette so that a cassette
is securely fixed in position.
3. Enter the PLAY mode. If the tape in VTR is not at the tape top, rewind the tape to the tape top.
*
Tape top is the area which is 7 minutes or less from the tape top of a reel.
Note :
Perform rewinding a tape before creating a clearance at the top flange (E and G portions) of TG-3 and
TG-4. If a tape is rewound after a clearance is created, tape will not be wound around a reel with its bottom
edge contacting the reel hub. It results that the correct numbers of peak cannot be obtained in the
waveform.
4. Confirm that there are clearances between tape
edge and top flange (“
G
” portion) of TG-4, and
between that and top and bottom flanges of TG-
1. TG-2 and TG-3. (“
A
”, “
B
”, “
C
”, “
D
”, “
E
”
and “
F
” portions) (Fig.-1)
5. Confirm that the amount of tape contact at
entrance is in the specification. (Fig.-2)
< If the specification is satisfied >
Turn the TG-1’s top flange counter-clockwise
until numbers of peak increase by 0.5 peaks (half
peak). Then tighten the fixing screw to fix the
top flange.
< If the specification is not satisfied >
a) When the amount of tape contact is smaller
(when numbers of peak are smaller than
specification)
1) Turn the top flange of TG-1 counter-
clockwise until tape is raised by the
bottom flange. When numbers of peak
become 3 to 4 peaks, fix the top flange.
2) Confirm that there are clearances at “
C
”, “
D
”,
“
E
” and “
G
” of TG-2, TG-3 and TG-4.
b) When the amount of tape contact is too much
(when numbers of peak are more than
specification)
Confirm that tape is wound around a reel
with its bottom edge contacting the reel hub.
Confirm also that the tape top is used.
DSR-60/60P
DSR-80/80P
<Amount of tape contact at entrance>
Specification : Numbers of peaks are three to five when there
are clearances between tape edge and top flange
(“G” portion) of TG-4, and between that and top
and bottom flanges of TG-1, TG-2 and TG-3.
Fig.-2
TG-1 TG-2
TG-3
TG-4
A
E
C
G
B
D F
Head drum
Fig.-1
Amount of tape contact at exit
Three peaks
Five peaks
to
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