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1. LCD DRIVER pP (1C1701)
Abbreviation
Function
BACK LIGHT
LCD backlight contro! signal. When LED lights:
GND
Ground
When LAMP lights: "H".
Abbreviation
Function
SHUTTLE 2
SHUTTLE A/D input signals
SEGMENT (1)
Not used.
en rnst)
—x11
SEGMENT (2)
2.5/1.9
2.5
%* CLOCK FAST when SHUTTLE 2 is 5 V or less
SEGMENT (5)
KEY IN
Front key voltage data input
SEGMENT (6)
LCD segment control outputs.
FUTAB
FL mechanism loading/unloading detection, and TAB detection. Loading/
SEGMENT (7)
unloading completed: 1.24 V or more; In transition state: less than 1.24
V/ TAB
present: 3.75 V or more
|
7
1
Lo
P. STOP
Power failure detection signal. "L" is input when power failure is detected ("L"
when microprocessor voltage is 4.7 V or less).
SEGMENT
(31)
8
1
Hi
S. CURVE
Fine tuning detection signal
SEGMENT (32)
9
I
A/D
MODE 2
Mechanism mode switching signals
COM1
LCD common (COM) control outputs.
10
|
AID
MODE 1
Position
8
cOM2
FF/REW
MODE 1
3.0
-|-|-|-|-lololololo
COM3
RESET (L)
Initializes the LCD-uP when power is supplied.
MODE2
0.00
VDD.
ASV power input.
1
1
AD
VIDEO ENV
Signals are A/D converted and input for autotracking
VDD 1
LCD drive bias.
a
AID__|
AUDIO ENV
VDD 2
LCD drive bias.
13
1
A/D
MDOEL SW
Switches models according to the input signal.
vss
Ground.
14
i
AID
MTS MODE
MPX reception mode input signal. When receiving STEREO+BIL+SAP: "L";
~
-
-
STEREO: "ML"; BIL+SAP: "MH", MONO: "H".
vO
osc
Generates a 32kHz signal for key scanning.
15
i
=
VREF
AID converter reference voltage
I
LCD LOAD
LOAD signal between the LCD-uP and M-uP. "Lo" input enables chip select.
16
1
Lo
RESET
"L" input resets the microprocessor.
I
CLOCK (M-LCD)
The data is transferred from the M-uP, synchronized with the clock signal.
17
Oo
Hi
MONO OUT
When MPX IC output is forcibly set to MONO: "H"
I
DATA (M-LCD)
18
{e}
Hi
ST/SAP OUT
When SAP audio is output:
"H"
19
{eo}
Lo
NC
20
ie)
Hi
RF SYS (SW 1)
RF SYSTEM switching:
When tuner sound mode is set to BG/DK: "L", when tuner sound mode is set
to |: "H". Inverted by transistor.
ISw
IF SOUND switching:
When tuner sound mode is set to BG/DK: "H", when tuner sound mode is set
to I/NTSC: "L". Inverted by transistor + pulled up.
21
ie)
Lo/Hi
PAL/NTSC SW.
IF switching:
When tuner reception mode is set to PAL:
"H", when tuner reception mode is
set to NTSC: "L"
fe}
=
22
I
-
VCC
Connected to backup power supply.
23
fe)
Pulse
| SW25A
SW25 pulse for switching Hi-Fi heads
24
oO
Pulse
| SW25
SW25 pulse for switching WYC heads
25
oO
PWM
CAP PWM
Capstan motor control PWM output
26
{e)
PWM
DRUM PWM.
Drum motor control PWM output
27
[e)
Hi
V. PULSE
Artificial
V sync pulse output
28
oO
Pulse
| C. ROTARY
Chroma rotation control signal. EX-OR with SW25 and H.AMP SW.
29
fe}
Hi/Lo
H. AMP SW
DA4 head switching signal
30
I
Hi/Lo
COMP
Compares outputs from SP and LP heads: when the LP head output is higher,
"H'" is input.
31
VO
Pulse
CTL H (+)
CTL pulse input/output
32
| VO}
Pulse
| CTLH(-)
CTL pulse input/output
33 | —
=
Vss (SRV)
GND
34
|
/
Pulse
CTL AMP |1
CTL amp gain switching input
i
Pulse
CTL AMP 12
CTL amp negative feedback input
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