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4-3-27. NORMAL AUDIO BIAS
CURRENT ADJ.
BOARD
AUDIO C.B.A.
TP
NC
HEAD
ADJ
S-VHS:VR4007(CH1 )(A-1
),VR4008(CH2)(A-~
TAPE
S-VHS, VHS BLANK TAPE
INPUT
COLOUR BAR SIGNAL (LINE)
MODE
REC
M.EQ
V.T.V.M.
S-VHS CH1: 5.OmVrms ±
0.1
mVrms,
SPEC
CH2: 5.OmVrms ±
0.1
mVrms
VHS
CH1: 4.0mVrms ± 0.3mVrms,
CH2 4.OmVrms ± 0.3mVrms
1.
Supply the colour bar signal to video input.
2.
Insert the S-VHS blank tape and place the deck
in
REC
mode.
3. Connect the
V.T.V.M. to the A/C head
as
shown
in
Figure E26.
4.
Adjust VR4007 (CH1), VR400B (CH2)
so
that the
levels become
5.0mVrms ±
0.1
mVrms.
5.
Insert the VHS blank tape and place the deck
in
REC mode.
6.
Confirm the
CH1
and CH2 levels are 4.0mVrms ±
0.3mVrms.
A/C
HEAD
1m
VV1
VV2
CH1
CH2
TP
Figure E26
4-3-28. NORMAL AUDIO REC
CURRENT ADJ.
BOARD
AUDIO C.B.A.
TP
AUDIO OUTPUT
(CH1
,CH2)
TP4005(CH1 )(C-1), TP4006(CH2)(B-1)
ADJ
VR4005(CH1 )(C-1), VR4006(CH2)(D-11
TAPE
S-VHS BLANK TAPE
INPUT
1 KHz, -8dBv SINEWAVE
MODE
REC
M.EQ
V.T.V.M. (D.v.M.)
SPEC
S-VHS 0
+ O.5dB VHS 0 +1.0dB
[SET UP]
S-VHS SW :
ON
1.
Set the audio output select switch to NORM.
2. Connect the V.T.V.Ms to the deck
as
shown
in
Figure E27. Note that only one channel will
be
adjusted at a time.
3.
Supply a 1 KHz, -BdBv sine wave signal to the
AUDIO INPUT (CH1).
4.
Place the deck
in
the
REC
mode with S-VHS
mode.
5.
Adjust VR4005 (CH1)
so
that V.T.V.M.
(2)
reads
approximetely
0.5Vrms (1.41Vp-p) .
6.
Playback the recorded portion, and note the
amount of difference between
V.T.V.M.
(1)
and
(2).
7.
Place the deck
in
the
REC
mode again, and
readjust
VR4005
(CH
1)
slightly,
and
repeat step
5,
nothing the new dirfference.
B.
Repeat this "Record/Set/Note to Playback/Note"
record and playback readings is minimized
(OdBv
± O.5dBv).
9.
Repeat the above procedure again for channel 2,
using the other set
of
test points and VRs.
DECK
slVoToVoMoW
I
AUDIO OUT
~~
AUDIO
IN
~
SINEWAVE
\ SIGNAL
TP4005
(CH1)
GENERATOR
TP4006
(CH2)
V.T.V.M.(2)
Figure E27
4-12
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