7-15
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
PB Head Head-to-tape Contact Check
7-1-3. Video Tracking Check and Adjustment
5. Check the PB Head Head-to-tape
Contact
(1) Play back the SR2-1/P (20:00 to 25:00).
(2) Push S100 switch on the SS-63 board more
than 1 sec. so that the tracking VR becomes
to be effective.
The waveform is displayed on the oscillo-
scope as shown in the figure.
(3) Turn the tracking VR so that the output level
of the center portion of RF waveform of A1
channel is maximized.
(4)
Check that RF waveform of A1 channel
satisfies the spec.1 in a state of procedure (3).
(5) Maximize the output level of RF waveform
of A5 channel, check that RF waveform of
A5 channel satisfies the spec.1.
(6) Change the connections of CH-1 and CH-2 of
the oscilloscope as follows, and perform the
check from steps (1) through (5) in the same
way.
<For DNW-A100/A100P>
.
CH-1: TP500, CH-2: TP100
.
CH-1: TP400, CH-2: TP101
.
CH-1: TP600, CH-2: TP101
.
CH-1: TP1300, CH-2: TP102
.
CH-1: TP1500, CH-2: TP102
.
CH-1: TP1400, CH-2: TP103
.
CH-1: TP1600, CH-2: TP103
(All of these TPs are on the EQ-56 board.)
<For DNW-A50/A45/A50P/A45P>
.
CH-1: TP1500, CH-2: TP102
.
CH-1: TP600, CH-2: TP101
.
CH-1: TP1600, CH-2: TP103
(All of these TPs are on the EQ-56 board.)
n
The signal that is output from each TP is as
shown below.
TP100 (A1A5 SEL signal)
TP101 (A3A7 SEL signal)
TP102 (B1B5 SEL signal)
TP103 (B3B7 SEL signal)
TP300 (A1A5 signal)
TP400 (A3A7 signal)
TP500 (A2A6 signal)
TP600 (A4A8 signal)
TP1300 (B1B5 signal)
TP1400 (B3B7 signal)
TP1500 (B2B6 signal)
TP1600 (B4B8 signal)
.
Alignment tape : SR2-1/SR2-1P (20:00 to 25:00)
(Tracking VR : Effective)
<SS-63 board, side A>
A
B
C
D
E
F
G
H
S100
RV100(Tracking VR)
J
K
L
M
N
P
R
1
2
TP325
B
A
Spec. 1
C
A
x
100
>
80% (Drum exit side)
x
100
>
80% (Drum entrance side)
D
A
x
100
>
80% (D is minimum output level of waveform)
D
A
B
C
CH-1
(A1A5 signal)
Maximize
RF waveform of A5
RF waveform of A1
RF waveform of A5
CH-2
(A1A5 SEL signal)
