Pin No.
Name
I/O
Description
1~3
T.P
O
Test monitor. Normally outputs Low.(Unused.)
4
VSSO
-
Digital GND.
5~8
T.P
O
Test monitor. Normally outputs Low.(Unused.)
9
TSTO
I
Digital GND.
10
VDDO
-
Digital power supply.
11
VSS1
-
Digital GND.
12~15
TST1~4
I
Digital GND.
16
XRST
I
System reset input. Reset when Low.
17
BFOT
O
Unused.
18
CSL1
I
Digital power supply.
19
CSL2
I
Digital GND.
20
VSS2
-
Digital GND.
21
AVS3
-
L-ch DA converter GND.
22
AVD3
-
L-ch DA converter power supply.
23
LOUT
O
L-ch DA converter output.
24
AVD1
-
L-ch AD converter power supply.
25
AVS1
-
L-ch AD converter GND.
26
L01
O
L-ch AD converter LPF operational amplifier inverted output.
27
LIN
I
L-ch AD converter analog input.
28
AVD5
-
C-ch DA converter power supply.
29
AVS5
-
C-ch DA converter GND.
30
XCOUT
O
C-ch DA converter output.
31
AVDX
-
Analog power supply for master clock.
32
XTLO
O
Crystal oscillator circuit output.
33
XTL1
I
Crystal oscillator circuit input.
34
AVSX
-
Analog GND for master clock.
35
XSOUT
O
S-ch DA converter output.
36
AVS6
-
S-ch DA converter GND.
37
AVD6
-
S-ch DA converter power supply.
38
RIN
I
R-ch AD converter analog input.
39
LO2
O
R-ch AD converter LPF operational amplifier inverted output.
40
AVS2
-
R-ch AD converter GND.
R-V251
5
CIRCUIT DESCRIPTION
Active
Pin. No.
Pin Name
I/O
Description
H
L
56
POWER RLY
O
Power relay control.
ON
57
10dB. ATT
O
Volume 10dB attenuator control.
ON
58
ST. LED
O
STANDBY LED control(RED).
ON
59
ST. LED
O
STANDBY LED control(GREEN).
ON
60~69
-
-
Unused.
70~77
9S~16S
O
FL segment(9~16) and key scan(1~8) control.
78~85
1S~8S
O
FL segment(1~8) control.
86~88
-
-
Unused.
89
VDD
-
u-COM power 5.0V).
90,91
-
-
Unused.
92~100
G11~G03
O
FL grid control.
2. Key matrix
3. Pin description of dolby prologic IC(MAIN PCB IC105)
KS1(77pin)
KS2(76pin)
KS3(75pin)
KS4(74pin)
KS5(73pin)
KS6(72pin)
KS7(71pin)
KS8(70pin)
K1(19pin)
MODE
TUNING
-
-
-
-
PTY
AUTO
TIMER
TIMER TIMER
K2(18pin)
MULTI TUNING CLOCK
-
MODE
SET
TA
MEMO
K3(17pin)
MULTI -
INPUT
ON/STBY
INPUT
TAPE2
DISP
BAND
