3-6
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
3-3. Demagnetization Head Driving
Voltage Adjustment (MS-50 Board)
When the related circuit from RV901 to CN24 in the
demagnetization head driving circuit on the MS-50 board
was repaired, perform this adjustment.
m
Be sure to adjust with the hard disk drive unit removed.
.
When turning on the power with it removed, the system
error code D2 is displayed on the time data display area.
Nevertheless, there is no problem in adjusting.
.
When the hard disk drive unit was reinstalled, remove it
referring to Section 5-31.
Tools List
.
Digital voltmeter: ADVANTEST TR6845 or equivalent
.
Betacam SP cassette tape (metal particle type)
n
Never use the alignment tape because it may dwindle the
magnetic potential of this tape.
Preparation
1.
When the VTR is fallen sideways, replace it to normal.
2.
Connect the power cord and turn on the POWER
switch.
3.
Insert the Betacam SP cassette tape (metal particle
type).
4.
Wait more than 30 seconds after turning off the
POWER switch.
5.
Place the VTR with its right side panel down.
Adjustment
1.
Connect the digital voltmeter to TP902 (S-11) on the
MS-50 board.
GND: E1/MS-50 (C-11: in the suffix 11 or 12) or
E901/MS-50 (T-11: in the suffix 13 or higher)
2.
Turn on the POWER switch.
3.
During play back the inserted cassette tape in PLAY
mode, adjust so that the measuring voltage satisfy the
specification.
Adj. point:
1
RV901/MS-50 (P/T-8)
Specification: 180
+
5
mV dc
_
10
Perfection
1.
Wait more than 30 seconds after turning off the
POWER switch.
2.
Reinstall the head disk drive unit.
(Refer to Section 5-31.)
3.
Reattach the bottom plate.
4.
Replace the VTR to normal from falling sideways.
5.
Turn on the POWER switch.
6.
Eject the cassette tape.
J
F
G
8
MS-50
1-661-149-
MADE IN JAPAN
9
C
B
D
E
H
K
L
M
N
P
R
S
T
3
A
>EP–GW<
A No.
S No.
LOT No.
E1
TP1
TP2
E101
TP901
TP902
RV901
MS-50
1-661-149-
M
N
P
R
S
T
>EP–GW<
TP901
E901
TP902
RV901
A
2
1
7
6
5
4
10
11
For board No. suffixs 11 and 12
For board No. suffixs 13 and higher
MS-50 Board (Side A)
3-3. Demagnetization Head Driving Voltage Adjustment (MS-50 Board)
