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A1-14BOO(1) 1/1
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
I
1
Before making these adjustments,
Section
2-1. SERVO
and Section 2-2. VIDEO circuit adjustments
should be
carried out.
(
Oscilloscope
Vertical sensitivity
:10 mV/DIV
Band width
: more than 30 MHz
AC Voltmeter
Effective value indication
Input frequency
:10 Hz -20
kHz
Input Impedance
: more than 1 Mf2
Measurement
level :1 mV (full scale)
Blank Tape
I vHS-Me
cassette tape
I
2-3-2. LOCATION OF ADJUSTMENT
POINTS
2-3-3. BIAS LEVEL ADJ,
P1B24300B-A1
IC351
jcj-6j-<
. .. .. .. . .. ...
VR201
IC201
c1
BIAS
f--.,
~g.:
TP202
TP201
;-:
;!
IC302 ~~
::
;J
o
Tuner/lF/RF Conv.
Unit
........
:,
:,
;.--.-.;
1[
CP-1
PWB
(FOIL
SIDE)
Fig.
2.3.1
Ihlleasuring hint
\ Measuring Equipment
\ADJ.
Condition I
I
VR2131
W@
I 26 mVrms
I
1.
Load the VCR with a blank tape and select the record
mode without all incoming signal.
2.
After confirming on the oscilloscope that a 70 kHz * 5 kHz
sine wave is being output, adjust VR201 (BIAS) so that the
AC voltmeter's reading is 26 mVrms.
–12–
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