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A1-14229(N)
1/2
2-3.
AUDIO CIRCUIT ADJUSTMENT
Before making these adjustments,
(especially, the tape
guide height and audio control erase head height adjust-
ments) should be carried out, so that the tape traveling
between the loading guide pole and the audio control
erase head runs without fluttering, twisting, curling.
2-3-1. TEST EQUIPMENT
AND STANDARDS
REQUIRED
.
Before making these adjustments,
Section
2-1. SERVO
-
and Section 2-2. VIDEO circuit adjustments
should be
carried out.
Output frequency
Output level
Output impedance
Distortion ratio
Output in use SG
:10 Hz -20 kHz
: more than 1 Vrms
:600 Q
: less than 0.1%
: Frequency: .................. 1 kHz, 10 kHz (switchable)
Output level: ................-33.8
dBs ~ 0.5 dB
Standard Audio Signal Generator
Color Bar Signal Generator
Color bar signel with 100?4o white level.
(Signal waveform is described before. Refer to Fig. 2.2.1)
Oscilloscope
Vertical sensitivity
:10 mV/DIV
Band width
: more than 30 MHz
AC Vo
Itm ete r
Effective value indication
Input frequency
:10 Hz - 20kHz
Input Impedance
: more than 1 MC?
Measurement
level :1 mV (full scale)
Blank Tape
VHS-type cassette tape
2-3-2. LOCATION OF ADJUSTMENT
POINTS
PlB08300F-Al/l
'n
u
o
0
d'
...
:..,,..
u : .
'.. /
I
IC602
a
f
I .. . . . . . . . . . . . .
</
IF
VR351 ~---:
SW-P '~.'
.............
T;M-8 PWB
IC30'
IC351
o
Q
VR201
BIAS
...
Iclol
c1
o
IC201 n
TP202 ;...
:
TP;Ol~
..
.....
u
IC302
VR 104
IC321
o~
TP321
>
TPI02
TPIOI
{9;
VIDEO
CT321
(3UT
Vco
VRI02
DEV
:
/'0
Tuner
AGC
IC161
+
Unit
. . ..........
............
a);~:[~j{~;;{;;;
OTPl 03
...............
4
~ RF Conv. j
. ...................
VRI03
VRIOI
CAR
PB-Y
C ....-
CP-1 PWB (FOIL SIDE)
Fig. 2.3.1
–12–
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