Sanyo 18H-815 - Printed Circuit Board and Adjustments; Circuit Board Diagram; Adjustment of Semi-Fixed Resistors

cote
CIRCUIT
BOARD
DIAGRAM
.
.
7
?
‘ © i
ord
=
.
jl
N
g
Vv
Ilv
5
:
MP X £ P i
OUT
J2
3
G 9 ¢ '
no iH
A ou Reovenvoen
6
bo
‘
~
G
° .
N
=
~
wo
Ve)
oy
|
sa
o
2
|
S =
= pe |
:
SV
<
N
—
|
Be
—
=
co
|
oc
ne
2%
ey
2
ae
oc mnt
<-+
Cx ri
=> |
G .
wo :
—
_
Zd 1
72
6
eV
ee
ZV
| | AG AQ
ADJUSTMENT OF SEMI-FIXED RESISTORS
a) R88 (10K ohms) |
Apply audio signals into first audio stage and observe the ampli-
fied waveform of them with oscilloscope. Adjust R88 for the
operating point on which waveforms are clipped equally at both
tops and bottoms of waves.
b) R42 (100K ohms)
Make the unit into MW reception and set the dial pointor at
1000KC. Adjust R42 for 400”A (+50xA) current circulation thru
collector of Tr9 (2SC537E).
c) R12 100K ohms
Make the unit into FM reception and adjust R12 for 400A current
circulation{thru collector of Tr4 (2SC545).
i,¢)
>
oa
PJ7