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A114277(1) 1/2
2-3. AUDIO CIRCUIT ADJUSTMENT
.
Before making these adjustments,
(especially, the tape
"
Before making these adjustments,
Section
2-1. SERVO
guide height and audio control erase head height adjust-
and Section 2-2. VIDEO circuit adjustments
should be
ments) should be carried out, so that the tape traveling
carried out.
between the loading guide pole and the audio control
erase head runs without fluttering, twisting, curling.
2-3-1. TEST EQUIPMENT
AND STANDARDS
REQUIRED
Standard Audio Signal Generator (SG)
;?+
Color Bar Signal Generator
Oscilloscope
AC Voltmeter
Blank Tape
Output frequency
Output level
Output impedance
Distotiion ratio
Output in use SG
10 Hz -20
kHz
more than 1 Vrms
600 Q
less than 0.1'?4.
Frequency: ..................400 Hz, 10 kHz (switchable)
Output level: ................-33.8
dBs t 0.5 dB
Color bar signel with 100% white level.
(Signal
waveform
is described before. Refer to Fig. 2.2.1)
Vertical
sensitivity
:10
mV/DIV
Band
width
: more
than
30
MHz
Effective value indication
.-
Input frequency
:10 Hz -20kHz
";-~~''?~:
Input Impedance
: more than 1 MQ
Measurement
level : lmV (full scale)
VHS-type cassette tape
2-3-2.
LOCATION OF ADJUSTMENT
POINTS
PlBl1500C-Al/2
Iclol
:...,-:
0
;:
,. ..:
Iclll
o
'o
u
o
0
3
.,..,.
:.,
Q"
.. . . ,,:.
IC602
o
Cl
[
IC351
IC301
VR351
o
SW-P
,....,
:.9.;
a
VR201
D
IC201
...
~[
VR104
.,
VR102
'Ev
:.:
0
I
'r...
. . . . ..0
IC161
a
. . . . .. . . . . . ..
TP1020;J:10
;i ~ ;ie-:OTplOs
:---. -......,
,....! ...., .. . .. ....,'
CAR
PB-Y
CP-1 PWB (FOIL SIDE)
Fig. 2.3.1
–12–
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