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(This schematic diagram may be modified at any time with the
development of new technology.)
Notes:
$701:
Power source switch in ''on'" position.
29S901~910:
Preset tuning switches.
$901: CH1, S902: CH2, S903: CH3, $904: CH4,
$905: CH5, S906: CH6, S907: CH7, S908: CHB,
| $909: CH9, S910: CHO
®$911~S913:
Band selector switches.
(S911: FM, $912: MW, S913: LW)
eS914:
Memory set switch.
S915:
FM mode selector switch.
$916, $917:
Tuning switches.
(S916: down, S917: UP)
®|ndicated 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 volues, depending on the internal
impedance of the DC circuit tester.
{):
AM voltage, |:
MUTING voltage
Positive voltage lines ~*-=-«- Negative voitage line
Ssact> FMOSC
===> FM signal
sega AM OSC
summed AM signal
AF signal lines
@lmportant safety notice
Components identified by A\ mark have special characteristics
important for safety. When replacing any of these components,
use only manufacturer's specified parts.
28C2787LTA
28C3940AQSTA
1SS254TA
2SD1450RSTTA
1SS291TA
1SR35200TB
Ca
fo
La
A
E i
EA
2
B
8B
Anode
@Use of ceramic filters in pairs
The ceramic filters (CF201, CF202) for FM-IF circuit are available in
three ranks. For this circuit, be sure to use the ceramics of the same
rank in a pair.
At repairing and replacement, pay close attention to the resistors
(R907, R908) for use as different resistors must be used depending
on each rank of the ceramic filters.
Color making
(Red, Blue or Orange)
| RANK
| CENTER
(Color) | R908
| F907 | eREQUENcY |
x
| 10.72MHz
|
|
10.70MHz
|
Orange
:
Blue
|
x
Note: © mark: Resistor is used.
e)
{10.67 MHz
a
|
x mark: Resistor is not used.
pain,
«Caution!
IC and LSI are sensitive to static electricity.
«Put a conductive mat on the work table.
2SA933SQRSTA
28C1740SQSTA
DTA114YSTP
DTC114YSTP
DTA144ESTP
DTC124ESTP
wIietlo:
DTC144ESTP
LNO31441P
MA4150MTA
!
MA4051MTA
MA4062MTA
Ca
eS
Cathode
Cathode
it
M MOD
memory
||
MEMO
r
(LW)
(7)
(8)
(9)
{ 0)
G } ny
SET
TUNING
(6)
CHANNEL
RANDOM
PRESET
(5)
(4)
[24
(3)
@ CIRCUIT BOARDS A
[2] OPERATION
SWITCH
PCB.
(UP
a)
(DOWN
© )
2
UNING
}——J
={i
L
| FM
ANT |
—750—
GNO
:
FM
offset
Voltage
3
ND WIRING CONNECTION DIAGRAM ears:
| AM AM
LOOP!
——
FANT!)
ANT
|
plOUTPUT FH
o l bedtala
ieee
a
(R ch)
(ich)
(Omv}
=4o-
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