Technics QUARTZ ST-Z400L

1C 301
AN7472S
FM MPX
I9kHz Output)
Q403,404
ORIVE
,707
[ol ks)
SHING™:
SELECTOR)
ISO
ENER
062
ZENER
C+)
‘2SAI1015
SIGNAL IND.
MPX VCO adj.
R313
Q402
2Scisis
SIGNAL IND.
DRIVE.
Signal Ind.
0403,404,405
LN446YP
SIGNAL IND.
D701, 702
Q7ol
2S0882
REGULATOR
SVOSRIK2
Atzo1 C)
RECTIFIER
nm)
(re)
A
CJ
i AC LINE
220V (50/60 Hz)
Ari
(2)
o 1
Tosa [feowstreo |
rp C704 240V( 50/60 Hz)
0702
(3)-€a9)
Q702
2SCI8 15
REGULATOR
emer)
}
i
‘ (o)) Pu
(LCD LAMP)
m@ SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the
development of new technology.)
*The part No. of transistors, IC and diodes mentioned in the schematic
diagram stand for production part No. Regarding the part No. with
@ mark, the production part No. are different from the replacement
part No. Therefore, when placing an order for replacement part, please
use the part No. in the replacement part list.
* This is the basic circuit diagram of this unit.
Note that part of the circuit is subject to change depending on the areas.
Note 1:
1. $17 : Power source switch in “on” position.
2. $901 ~ S908 __ : Preset tuning switch.
* With it momentarily pushed (less than 0.4 sec.) and
released, the 1 ~8 CH are received.
* With it continuously pused (0.4 sec. or more) and
released, the 9 ~ 16 CH are received.
3. $909 : FM selector switch.
4. $910 : MW/LW selector switch.
5. $911 : Memory set switch. (manuals auto memory)
6. $912 : Tuning (down) switch.
- [down: tuning to lower frequency]
7. $913 : Tuning (up) switch.
[up: tuning to higher frequency]
8. $914 : FM mode switch. (stereo «+ mono)
9. Indicated voltage values are the standard values for the unit measured by
the DC electronic circuit tester (high-impedance) with the chassis taken
as standard. Therefore, there may exist some errors in the voltage values,
depending on the internal impedance of the DC circuit tester.
* Figures in[____]stand for DC voltage in FM signal (no signal) reception .
mode.
* Figures in™ _,stand for DC voltage in FM stereo signal reception
mode.
* Figures in ( ) stand for DC voltage in MW reception mode.
* Figures in [ ] stand for DC voltage in LW signal reception mode.
10. - Positive voltage lines & AF signal lines
c—>FMsignal cooot>FM IF se >AM signal mame AM IF
11. Important safety notice.
Components identified by AV mark have special characteristics
important for safety. When replacing any of these components, use
only manufacturer's specified aprts.
Note 2:
e Use of ceramic filters in pairs
The ceramic filters (CF 101, CF 102) for FM-IF circuit are available in three ranks.
For this machine, be usre to use the ceramics of the same rank in a pair.
At rapairing and replacement, pay close attention to the diodes (D901, D902)
for use as different diodes must be used depending on each rank of the ceramic
filters.
Color marking
RANK
(Color)
SFE
10.7 MHZ
(
| Note:
© Mark : Diode is used.
X Mark : Diode is not used.
@ LIQUID CRISTAL DISPLAY (LCD)
e Common terminal (No. 1, 2)
AN7274NS, AN7472S -
oa
1
LN446YP SVDKV1236Z
Al
KI A2
Segment
== iis
i
ad fe
2SA722 2SC945 2SD882
2SA1015, 2SC1675
2SC1815
ongaany f @
BS B
MA165 SVDSR1K2