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AI-14212(I) 1/3
2-3, AUDIO FM (Hi-Fi)/ NORMALCIRCUIT
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
Frequency Counter
Blank Tape
Output frequency
Output level
Output impedance
Distortion ratio
Output in use SG
: IO HZ- 100kHz
: more than 1 Vrms
:600 Q
: less than 0.17.
: Frequency: .................. 1 kHz, 10 kHz (switchable)
Output level: ................-33.8
dBs + 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
:morethan30
MHz
Effective value indication
Input frequency
: IOHZ -20kHz
... , . ,,
Input Impedance
: more than 1 MQ
Measurement
level : lmV (full scale)
Input frequency
:20Hz
- IO MHZ
2-3-2.
LOCATION
OF ADJUSTMENT
POINTS
VHS-type cassette tape
P1B105OOD-A1
I
'o
o
#
IC301
o
a
,.--,VR234
??.;R.FO
IC231
TP234
o
,..?;P233
:.?,:
VR233
L-FO
Iclol
:"'-'"; ,Cl ,,
Q
:...:
0
VR201
BIAS
(~ ;
TP202'"--
TP201 D
0
IC35.
VRI04
~. . ....
::
:;
::
::
IC303
j
;
;.,
:;
::
::
:,
::
::
::
VR102
DEV
IC162
......!
o
AGC
/0
cT120
~ ,plo~: 'l-lit
Tuner
+,,
,
TPl 20 VCO
~TB1p;;::o2.:g::!?:?F::::Tp'-o3::::::;:!::::::::::::::!:v!?
;"-;;;on;:--;
VR103 VR101
.....................
CAR
PB-'t
CP-1 PWB (FOIL SIDE)
Fig. 2.3.1
—
—
–12–
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