3-3. SE RVO SYSTE M ADJUSTMENT
3-3-1 . Capstan DC Bias Adjustment (MD- 1 0 Board)
Mode:
Playback ( Refer to 2-4 . Tape Path Adjustment ,
2-4- 1 . Preparation for Adjustment 4 ) for playback
procedure. )
Tape:
A n unused tape
Frequency counter:
SV- 1 6 board pin
@
Adjustment Procedu re:
Adjust RV202 for a reading of
8 2 5 .5
±I
Hz. (Fig. 3 -5 )
Fig.
3-5
Capstan DC bias adjustment
3-3-2. R F Switch ing Position Adjustment (MD- 1 0 Board)
Mode:
Recording
Subject:
Color-bar chart (standard frame)
Adjustment Procedure:
1 ) Record the color-bar c hart.
2 ) Play back the recorded tape on playback equipment
( E V-A300, EV-S 700, etc .)
3) Check the switching position on t he playback equip
m ent. (Fig. 3-6 )
4 )
Note:
R efer to the Service Manual for the playback equipment, " R F
Switching Position Adjustment".
If the specifications are not satisfied, turn RV203 and
repeat steps
I )
- 3 ) .
CH1
,.,. �
I
\
CH2
Approx.
1
Vp-p
\
I
Enlargement
\
L=t
L
Approx.
V
4
Vp-p
CH1
I
'
CH2
6.5
±0.3 H
-J
(4 10 ±20
µsec)
Fig.
3-6
RF switching position adjustment
3-3-3. ATF Recording Current Adjustment ( R P-29 Board)
Mode:
Recording
Tape:
MP tape
Connection:
Connect t he following three points with
jumpers.
•
RP-29 board pin
Q)
( REC AFM ) and pin
(2)
( REG
GND)
•
RP-2 9 board pin
Q)
( REC C ) an d pin
(9)
( REG
GND)
•
RP-29 board pin
@)
( REC
Y)
an d pin
@
( REG
GND)
Adjustment Procedure:
I )
Connect the oscilloscope t o RP-29 board pin
(0
( REC
ATF) and confirm that the ATF pilot signal is 0.62
±0.06 Vp-p
( I
02 kHz - 1 65 kHz). ( Fig. 3 -7 )
2 ) Reconnect the oscilloscope t o RP-29 board pin
''.!]).
3 ) Turn RVS 02 on the RP-2 9 board and adjust t o
8 mVp-p . ( Fig. 3 -8 )
4 ) Remove t h e j umpers after completing adjustment.
Fig.
3-7
Fig.
3-8
A TF recording current adjustment
-
7 3
-
