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15515(N)
Al
2-3. AUDIO CIRCUITADJUSTMENT
L*
Before making these adjustments,
be sure to make the
.
adjustments
described
in the tape path adjustment,
especially
the ACE heads adjustments
(refer to the
separate volume "Mechanism
Manual") so that the tape
traveling between thesupplyside
guide roller and loading
guide post runs without fluttering or curling.
2-3-1. TEST EQUIPMENT
AND STANDARDS
REQUIRED
Before making these adjustments (except the ACE heads
adjustments), be sure to make the adjustments described
in section 2-1, "Servo Circuit. " and section 2-2, "Video
Circuit. "
Oscilloscope
Vertical sensitivity
:10 mV/DIV
Bandwidth
: more than 30 MHz
AC Voltmeter
Effettive value indication
Input frequency
:10 Hz -20
kHz
Input impedance
: more than 1 M!2
Measurement
level
:1 mV (full scale)
Blank Tape
VHS-type cassette tape
L
2-3-2. LOCATION OF ADJUSTMENT
POINTS
P36200B 1A8
,.--.-,
I
,
!1
'5
in
3
in 1 Tuner __+
o
,, 11
II 1,
c-N~51
Tp201 (+)+
Hli
;
TP202(–)-
;
;
'.. . . ..
,8 ,,
,-F
.
...>
.
.
,*---.-.:J
,.- ...
IC201
!e:
. . .. . .
VR201
m
J3087
y
CN303 ;;'>
':';;.)4
~
,
,
{:
1
t
t
,1
t,
:
,,-%
I
, ,....:
I
, . . . .
>
11
,,
I
,---
;
i&@l
::.
...1
; -';~-~ M These VRS
are posi-
tioned with
the models.
CP-I PWB (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
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.
After confirming on the oscilloscope that a70 kHz* 5 kHz
sine wave is being output, adjust VR201 (BIAS) so that
the AC voltmeter's reading is 26 mVrms.
–13–
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