Technics SH-4020

Wi
SCHEMATIC
DIAGRAM
z
:
g
5
4
3
2
(This
schematic
diagram
may
be
modified
at any time
with the
development
of
new
technology.)
(Fluorescent
Display
Tube)
FL
aos
sah
F
-
Filament
Op
—
Dot
G
—
Glid
a~g
—
Segment
A-—-
on
*
The
part
No.
of
transistors,
|1C
and
diodes
mentioned
in
the
schematic
diagram
stand
When
segment
2
indicated
OV
a4
for
production
part
No.
Regarding
the
part
No.
without
©
mark,
the
production
When
segment
is
not
indicated
—20V
F
Dp
Q@
Col
G
94
e4
b4
c4
#3
g3
a3
b3
d3
c3
e3
G
f2
g2
d2
a2
b2
e2
c2
fl
gi
al
bi el
cl
dl
F
A
part No. are different from the replacement part No. Therefore, when placing an
order for replacement parts, please use the part No. in the replacement parts list.
SSTUPTTTile Lee lL LL
ae
AC 50/60Hz
110/120/220/240V
SVDMZ409B
9V ZENER
* This is the basic circuit diagram
(for DX, EK, EF, EB, EH, Ei) of
this unit.
Note that part of the circuit Is
subject to change depending on
the areas.
@ Power source circuit
[EW] and [DM] areas.
Notes:
1.81 : Mode selector switch in ‘’time set’’ position ( 4) time set,
second set, (3) clock, @ timer on set, (5) timer off set, oy
) sleep). | SVDSRIK2
2.S2~S4_ : Timer/time set switch
piper tine set (S2 : fast, S3.: slow, S4: peverseld
second set (S2 : reset, S3 : hold) bide te
3. $5 : AC outlet selector switch in ‘‘auto’’ position. (auto <> manual) SVDMZ406B
4. $6 : AC outlet selector switch in ‘off’ position. (on <> off) 6V ZENER
5. $7 : Power frequency selector switch in ‘’50H2z"’ position. (50Hz <-> 60Hz) Cl 0.0l B
6. $8 : Voltage selector switch in ‘'220V” position.
(110V <> 120V «> 220V<—> 240V) 5
7.RLY 1 : Relay in ‘‘off (normal open)” position. 2
rr
VOLTAGE ete tee
SELECTOR 4! 240ov_ BLK J 1_BRN @
ca Aw le -
P AC 21 otis 9
| | | }
Qa
Cc
er ee a ee
a2
b2 62 c2 f | gi al bl
e3 f2 g2
MN6O76
d2
Ic | CLOCK TIMER
SLEEP
OUT
12/24Hr 50/60
IHz SELECT BLANK SELECT
-— TIMER—
Hz—-4
IN FF/REV SLOW FAST MS! MS2 MS3 Vss Voo OFF IN ON IN OUT
© Power source circuit [EG]
wo
SENEC ORG: SELECTOR ; 240V BLK AT. =0.8, eS 0,
Oo
D
A cor D3,07 ~p9 When mode switch is in ‘‘sleep’” position,
110/120) 110/120/ © MAI50 * Relay(RLY 1) — ON: OV
220/240V
220/240V
:
5 on Relay(RLY 1) — OFF: —0.7V
06 Bee OD off $2. FAST/RESET
: $3 : SLOW/ HOLD
© MAI50 2SAl 33 ae ‘Cee $4 REVERSE
RELAY DRIVE
Product for Scandinavia and Denmark. Product for F.R. Germany.
@ Terminal voltage of IC1 (MN6076) when the © Terminal voltage of 1C1 (MN6076) when the e Terminal guide of transistors,
- é ape oe an ar ae . Tap = . . Ps
fluorescent display is (=: i; (_; (Unit: V) fluorescent display ; ; | | : | | repeats blinking. (Unit: v) IC’s and diodes
Pin, MODE:time set__| MODE :time set__ || MODE :time set | MODE time set pin| MODE time set_ Sines MN6078 :
No| outlet outlet No| outlet = hep ont POMEL gc cen hp. q . outlet.
Reach :manual/off Ras ar :manual/on ‘ anol :manual/on :manual/off pa :manual/on ae
Same as wave form | Same as wave form 50/60Hz SELECT
@ of terminal @. of terminal @9. 1:
Same as wave form j| Same as wave form oe . :
@ of terminal @9. of terminal @9. a ae vee ne im
a ea S| (MODE) 2SA733
Same as wave form | Same as wave form @® time set as
of terminal @9. of terminal 69. second set oy
29) . timer on. set 04.05
-
timer
off
set
:
(
20
a
©
sleep
he)
MA
|50
:
F
Same as wave form
of terminal 69.
Same as wave form
of terminal @9.
B
8. [____Jindicated voltage values are the standard values for the DC electronic SVDMZ312B, SVDMZ309A
circuit tester (high impedance) with the chassis taken as standard. Therefore,
there may exist some errors in the voltage values, depending on the internal bof
impedance of the DC circuit tester.
4 1 Indicated voltage values are relay on. =D
Q, mums Negative (—B) lines
10. Important safety notice:
Componetns identified by AV mark have special characteristics important
for safety. When replacing any of these components, use only manufacturer’s
—10
[nee ee
iE:
(1Hz)
Same as wave form -
of terminal @9.
Terminal 62 with S2 depressed is OV.
Same as wave form
of terminal @9.
|
to
oh
S| © esis)
|
;
—
Terminal @2 with S2 depressed is OV.
Terminal 63 with S3 depressed is OV.
Terminal @) with S4 depressed is OV.
Terminal @3) with S3 depressed is OV.
Terminal @) with S4 depressed is OV.
specified parts.