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Technics Quartz ST-610L Service Manual page 6

Synthesizer lw/mw/fm stereo tuner
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e ADJUSTMENT POINTS
AM LOOP ANT
ma oe
OUTPUT
1
Paste aay
AM ANT [
]
GND
&
R
2201
FM FRONT-END PAC
L321
B22
|
6
aca
LL
|
©
8s
Z102
L324
Z202
Van
ck a ae
ces
a
Cee
eX
K©)
TP201
Preo7
FM MPX VCO
(19kHz)
|
FM MONO
FM offset
" "Pi SONNE
connecrion
*F position
1 position.
jhting)
Sof pilot
" | 36
| OUTPUT
Muting signal terminal. (Muting + High level)
PBO
Stereo signal terminal.
INPUT
pd
|-SO signal terminal.
| 48
Tuner select terminal. (Ground connection)
- ST-610L
m@ FUNCTIONS OF IC TERMINALS (1c901: Lc6512A3997)
[PIN/NO. | IN/OUT | MARK |
DESCRIPTION OF TERMINAL
[tf inpur_| p69 _| Computer drive termina
OUTPUT
CL
4
CE
"'DO~D13: Divided frequency data
RO~R2:
Reference frequency data
f XOSC:
Crystal OSC
a
ee
Not used in this unit.
[6 | = | NG | Notusedinthisunt
CS
[7 [OUTPUT | POO | Autoimono changeover terminal, (auto—OV,mono—6V)
ig == wieienaeirguaaeaaaaaamaieamamins
Not used in this unit.
Hee
_
=e
Reset terminal
| TEST |
;
Digital signal terminal for display.
Terminal for key return signal to external key matrix.
Ground terminal.
aa
Not used in this unit.
a
INPUT
Connecting
terminal for crystal oscillator.
| 21
| OUTPUT | OSc2
i. _
Segment signal terminal for display.
| 37
INPUT
HOLD
Terminal for power failure detection.
| 38
INPUT
Terminal for remote control cord.
baer | INPUT
fae) Power supply terminal of device.
Voltage of 5V is supplied during operation of device.
~ (KEY. MATRIX]
Terminal for key return signal to
external key matrix.
.
.
ae =a
[2s | wove [menor] uP | bows |
e1—
Te
| Not used in this unit.

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