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A1-14801(1)
1/1
2-3, AUDIO CIRCUIT ADJUSTMENT
e
.
.
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
Oscilloscope
Vertical sensitivity
:10 mV/DIV
Band width
: more than 30 MHz
AC Voltmeter
Effective value indication
Input frequency
:lOHz-20kHz
Input Impedance
: more than 1 'MQ
Measurement
level
:1 mV (full scale)
Blank Tape
VHS-type
cassette tape
2-3-2.
LOCATION OF ADJUSTMENT
POINTS
-
P1B24300B-AV3
o
C)v ~...,
:e:
.....
c1
VR351
SW-P
IC351
IC161
......... ....
. . ...........
CP-1 PViB
(FOIL SIDE)
Fig. 2.3.1
2-3-3. BIAS LEVEL ADJ.
@
,., ,
Measuring
Point
Measuring
Equipment
ADJ. Condition
TP201 (HOT)
Oscilloscope
REC mode
TP202 (COLD)
AC voltmeter
Blank tape
I
ADJ, Location
ADJ. Value
VR201 (BIAS)
26 mVrms
1.
Load the VCR with
a blank tape and select the record
mode without
all incoming
signal.
2.
Af%rccnt3r~,
ingon
the csc;l!csc~c~
'h=ta 70kHz+5
W!z
'
k,. " .,. -
sine wave is being output,
adjust VR201 (BIAS) so that
the AC voltmeter's
reading
is 26 mVrms.
—
'12–
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