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Sanyo VHR-420 Service Manual page 6

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S1-14S30(N) 1/2
2.
ELECTRICAL ADJUSTMENT
2-1,
SERVO CIRCUIT ADJUSTMENT
.
These adjustments
should
be carried out upon completion
of the tape transpofl
adjustments.
.
If the tape transpo~
adjustments
(except the tilt adjustment)
are carried out after these adjustments,
follow
the procedures
again in Section 2-1-3. SWITCHING
POSITION ADJ.
.
When a cassette tape is loaded, auto-tracking
will be set immediately
after starting the first playback.
AS this will
deviate the
tracking center set, be sure to press the channel buttons (+) or (-) once directly after starting
playback to prevent auto-tracking
from being set.
2-1-1.
TEST EQUIPMENT
AND STANDARDS
REQUIRED
Oscilloscope
Vertical sensitivity:
5 mV/DIV, external trigger
Band width: more than 10 MHz
Alignment
Tape
VHJ-0009 or VHJ-0023: SP mode, monoscope,
6 KHz
Blank Tape
VHS-type cassette tape
I MonitorlV
I
2-1-2. LOCATION OF ADJUSTMENT
POINTS
PlB243CKJB-Sl/2
[
'n
u
o
0
N
*
~. ... :..+.:
c)
VR351
SW-P
!C251
L
o . . . . . . . . . . . . . . . . ,
Q!
1:
. . . .
POWER
~
SUPPLY
;
PART
IC301
Iclol
:-. . .-:
Q
::
:...:
ICI 11
II
.,,
,"7
"'F)
'E;*
'fvn
?
jTPlol
VR103
vRi(
.. ....................... Video Out
CAR
pB.\
VR201
—.. - . .......
I
BIAS
!
[C*O1
u
'[S! ~c
TP202
~
i
TP201
:
~
(HOT)
;
~
... :.
:!
VR4flA
.,
-+/w
IC161
Q
.............
..... ,-.--,,.---t,----1 ~Tp103
: ...... .....
Tuner/lF/RF
Conv. \
\
Unit
ft
... ......
)1
{
CP-I PWB
(FOIL
SIDE)
Fig. 2.1.1
I
,
,
6
".,
–6–
.— -

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