Technics Quartz ST-G7 User Manual

@ FUNCTION OF TERMINAL (MICRO COMPUTOR IC903 ¢ MN1554STD) @ FUNCTION OF LIQUID CRYSTAL PANEL
: e COMMON
| aa VO Mark Description of terminal ei as 1/0 Mark Description of terminal ete
1 INPUT yT CE1 Power failure detection, De- — 35] INPUT AD Analog digital converted
tected with input at “L". signal is put in from IC902 ®
terminal 14.
Power “ON” Power *OFF” 4.
5v 36 | INPUT SD This input terminal detects —
ie the reception of a auto tuned.
2.5V with a broadcast received,
ro Tt : : ; and O V without ivi
2,3
—
—_—
Not
used
in
this
unit
=
Broadens.
epee
sae
4 | INPUT CE2 Power failure reset detection. | — |
rive “output” ! Detected with input at ‘"L”’. —2.5V
Power “OFF” Power “ON” OV
10V Auto tuning
5V ; : .
37 — — Not used in this unit _
| & | INPUT INT Interrupt request signal input — 38 |OUTPUT| KOQ9 Diode matrix key scan signal — e SEGMENT
i terminal. Signal from control output
| input bal Is put in. De- 39 }OUTPUT HBL Hi-blend, High frequency —_—
tected with input at “L”. cutting command output
= IN. i en Oe aly! during weak input signal
91) 26 th “a Le cH | reception,
Szbmsec_SB0msec 200meec 4 40 —_ — Not used in this unit —
6 JOUTPUT SBT Signal output of transfer re- — 2
ference clock for LCD drive. 42
Waveforms No. (SV alter reference clock 43 |OUTPUT| DT OUT; Data output to personal com- —
output) puter.
2usec 5V 44 ;OUTPUT| RF ATT; Gain control output of RF —
amplifier.
1v +
45 oe — Not used in this unit —
L
7 JOUTPUT SBO Reference frequency output. a
(Data output) @ i
53 | INPUT OSsC1 Connection terminals of
8 |OUTPUT SBI
ceramic oscillator.
54 | INPUT OSC2 Oscillating frequency is 2 MHz.
55, — — Not used in this unit
Microcomputer reset. Reset —
9 INPUT RST with input at “LL.
10 JOUTPUT ae Signal output for key scan
Termin
No. of
1C904
Ground terminal
FM/AM/REC
Q
17 KO7
58 | OUTPUT
OUTPUT Pulse waveform output for neg FOWTPUT Se selector a
the
beginning
and
the
end
[FM
|
AM
[REC]
:
;
of each data. ary 1 [0 | Pa © Common output waveforms of 1C904 (LCD drive) @ Segment output waveforms of 1C904 (LCD drive)
19
Not
used
in
this
uni
o-ov
[811
[7
jo
|
;
=
—_
ot
used
in
this
unit
—
Terminals,
34
and
17
always
deliver
outputs
whose
24 60} — — Not used in this unit = waveforms are shown below.
+ : 61 |OUTPUT IF Normal/Super narrow select —_ ;
25
|
INPUT
VDD
Power
supply
terminal
|
—
for
FM
IF
Sane!
flow
34
terminal
(COM
1)
of
iC904
Between
34
terminal
of
IC904
and
other
terminals
26 — es Not used in this unit Sao ¢| output "L" (OV) »FM IF (1,3 ~5,7~13, 21, 22, 24 ~ 26, 29 ~ 32) of IC904
27
band
is
super
narrow
; T output “'H” (4V) »FM IF ! i 1
28 JOUTPUT | 333 Hz Reference signal output ® | band is normal
for record level check. : - - Segment Segment | Segment : Segment
29
|
INPUT
KIO
Key
input
from
external
B2
=
mas
Netesed
in
Usunt
==
“ON”
“ON”
|
“OFF”
|
“OFF”
2 2 key matrix. © 63 |OUTPUT| MONO Stereo/Monaural switching —_—
32 KI3 signal. (Monaural -5V, i
33 | INPUT VDD Power supply terminal — Sishee OY
; 64 |OUTPUT} MUTE Output terminal to eliminate —
34 | INPUT ST anes ee oe — shock noise in case of PLL
signal with input at : lock failure. When CE terminal
is at low level, the output to Segment | Segment Segment Segment
this terminal is at high level. “ON” “OFF” "ON" “OFF”
Ei deel en 17 terminal (COM 2) of 1C904
: 1.5sec
0.4v Fate
Power ON) @ How to measure the waveform
rower SOF, of each segment
(NOTE)
For the output waveform of each Connect common
segment, the potential difference terminal of IC904
from that of COM terminal wave- ees
Between 17 terminal of 1C904 and other terminals
(1 ~5,7~9,11~14, 29 ~ 33) of IC904
Oscilloscope
form is measured. So, do not con- Connect
as nect the groundign wire of other each segment
—+_______] equipment to the oscilloscope. terminal of
Otherwise, 1C904 will break down. 1¢904
= —16—

Technics Quartz ST-G7 Specifications

General

Brand	Technics
Model	Quartz ST-G7
Category	Tuner
Language	English