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i SCHEMATIC
DIAGRAM
Note 1:
1.$601-1
Main speaker switch in "ON" position.
(= on, Moff)
2,$601-2
_ : Remote switch in "OFF" position. ( = on, M@ off)
3. $701
Impedance selector switch in "82" position.
4, $801,802:
Volume control switch. (S801: down, S802: up)
5. $803,804:
Balance control switch. (S803: right, S804: left)
6. S805~810 : Input selector in "tuner'' position.
ee phono, S806: tuner, S807: CD
]
$808: VCR 2, $809: VCR 1, $810: tape
7.8811
Loudness switch in "OFF" position.
8.S812~821 : AM/FM Random preset tuning.
$812: 0 $813:1
$814:2
$815: 3
$816:4
$817:5
S818:6
S819:7
$820:8
$821:9
9, $822
FM mode selector switch in "auto" position.
10. $823,824:
Band selector switch in "FM" position.
11. $825,826
: Tuning selector switch.
(S825: down, $826: up)
12, $827
Memory switch in "OFF" position.
13. $901
Power switch in "ON" position.
14, Direct equalizer level control key matrix circuit includes switches
that 'vary all frequencies in the range of + 10dB".
15. 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 AM signal reception mode.
Positive voltage lines
s e e s
AF signal lines
===
Negative voltage lines
cmnof> FM OSC
<=>
FM signal
muuep AM OSC
mp
AM signal
16. Important 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.
* Caution!
IC and LSI are sensitive to static electricity.
Sencondary trouble can be prevented by taking care during
repair.
%* Cover the parts boxes made of plastics with aluminum foil.
% Ground the soldering iron.
* Put a conductive mat on the work table.
+ Do not touch the legs of IC or LSI with the fingers directly.
—o4'S
EB tuner circuit
cags Ross
26
tae
Beox
ior
FM/AM LOOP FILTER eT
icz01
AN72734
e
FM/AM
IF AMP, OET &
Sx
AM MIXER
FM/AM SELECTOR
sie
2S8C1740S0S
'AM OSC BUFFER
R904 10K.
one
FMIN AMIN, BOS
ovr ogy
Ln
wlan
«iv
reso,
LM7001
PLL FREQUENCY
SYNTHESIZER
R310 10K
28CI740SQS
2SA933SORS
Note2:
* Use of ceramic filters in pairs
The ceramic filters (CF201, CF203) 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
diodes (D909, D910) for use as different diodes must be used
depending on each rank of the ceramic filters.
Note: © mark: Diode is used.
x mark: Diode is not used.
= 25—
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