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LASER DISC RF DEMODULATOR
DEM-9991D
SERVICE MANUAL
© 1998-2/B51-5412-00 (K/K) 3728
POWER
RF
LOCK
LASER DISC RF DEMODULATOR DEM-9991D
OFF
OPT.
COAX.
EXTERNAL DC SUPPLY DC 12V
DIGITAL OUTPUT
COAX.
DIGITAL INPUT
RF INPUT
COAX.
DC IN
OPT.
AC-3 RF
Chassis *
(A10-)
Indicator
(B08-9063-04)
Slide switch
(S62-0008-05)
DC jack
(E30-0315-05)
Rear panel
(A80-3383-04)
Optic receiving module
(W02-1181-05)
Phono jack
(E63-1035-05)
Panel
(A60-1377-04)
* Refer to parts list on page 8.
DEM-9991D(J,K) COVER( 98.4.25 0:09 AM y[W 2


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DEM-9991D
2
CONTROLS
1 POWER switch
Press to turn the power on (OPT./COAX. position) or
off.
· Regardless of the OPT./COAX. switch setting, the
input is switched automatically to the Dolby Digital
RF input when ever a Dolby Digital RF signal is
input.
2 POWER indicator
Lights (red) when the power switch (
1) is set to ON.
3 RF LOCK indicator
Lights when a Dolby Digital (AC-3) RF signal is input
to the AC-3 RF INPUT jack (
5)
4 DIGITAL OUTPUT COAX. (coaxial) jack
Connect this jack with the AC-3 DIGITAL IN jack of
your Dolby Digital (AC-3) decoder or receiver.
· When there are simultaneous inputs from the RF
INPUT (AC-3 RF) jack and DIGITAL INPUT (OPT.
/ COAX.) jack, the RF INPUT (AC-3 RF) signal is
output with priority.
5 AC-3 RF INPUT jack
Connect this jack to the AC-3 RF OUTPUT jack on
your LD player.
6 DIGITAL INPUT COAX. (coaxial) jack
Connect with the COAXIAL OUTPUT jack of your LD
player.
7 DIGITAL INPUT OPT. (optical) jack
Connect with the OPTICAL OUTPUT jack of your LD
player. BE sure to remove the cap before using this
jack.
8 DC IN (12V) jack
Connect the inlet type power cord from the provided
AC adapter. Do not plug the power cord into the wall
outlet until all other connections have completed.
DEM-9991D(J,K) COVER( 98.4.25 0:09 AM y[W 3


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Port NO
Port Name
I/O
Descriptions
59
TLDB
I
Test port of IC.
60
TCK
I
Test port of IC.
61
TRP
O
Output port of IC test.
62
TDO
O
Output port of IC test.
63
PDO
O
Phase comparator (3 states)
64
TI4
I
Test port of IC.
65
PDDIS
I
Output control of PDO. L = output.
66
MUTO
O
Muting output. H = mute. Also H = MUTI is "H" or out of synchronous of AC-3.
67
TI5
I
Test port of IC.
68
VLDY
O
Output port of IC test.
69
DASYO
O
Output port of IC test.
70
DAOUT
O
Digital out (serial data stream output)
71
DAIN
I
Extra input of digital.DASEL = "H" : signal though DAOUT.
72
DASEL
I
Choice of digital output
73
TI8
I
Test port of IC.
74
C2F1
O
Display of C2 error correction. Output of condition on error correction.
75
C2F0
O
Display of C2 error correction. Output of error count on C2.
76
C1F1
O
Display of C1 error correction. Output of error or non-error on C1.
77
C1F0
O
Display of C1 error correction. Output of error count on C1.
78
MUT1
I
Muting input. H = mute.
79
VDD
­
Power supply (+5V).
80
GND
­
GND (0V).
81
AVDD
­
Analog Comparator power supply (+5V)
82
CPIN
I
Analog comparator input. Negative port (invert).
83
CMIN
I
Analog comparator input. Positive port (non-invert:QOSK input).
84
AGND
­
Analog comparator GND.
85
TM4
I
Test port of IC.
86
VDD
­
Power supply (+5V).
87
DIN
I
Test port of IC.
88
DOUT
O
Analog comparator output.
89
DOUTB
O
Inverted analog comparator output.
90
C9M
O
9.216MHz output. 1/2 divided output of VIN (55P).
91
GND
­
GND (0V).
92
WINGT
O
Output port of IC test.
93, 94
SYST0, 1
O
Output port of IC test.
95, 96
ADST0, 1
O
Output port of IC test.
97
TM5
I
Test port of IC.
98
BUNRI
I
Test port of IC.
99
AGND
­
GND of 46.08MHz.
100
AVDD
­
Power supply of 46.08MHz (+5V).
Port NO
Port Name
I/O
Descriptions
1
GND
­
GND (0V).
2
VDD
­
Power supply (+5V).
3
RESET
I
System reset. L = reset.
4
OSCON
I
Oscillation control. H = oscillation. L = standby.
5
DATA
I
Test port of IC.
6
MCK
I
Test port of IC.
7
MLTB
I
Test port of IC.
8
IDST
O
Output port of IC test.
9
IDCK
O
Output port of IC test.
10
IDO
O
Output port of IC test.
11
TMO
I
Test port of IC.
12
ECCK
O
Output port of IC test.
13
DEN
O
Output port of IC test.
14
DEY
O
Output port of IC test.
15
MSYC
O
Output port of IC test.
16
TM1
I
Test port of IC.
17
A0
O
Address 0 output of extra RAM (LSB).
18~22
A1~5
O
Address 1~5 outputs of extra RAM.
23, 24
TM2, 3
I
Test port of IC.
25
XOUT
O
Output port of IC test.
26, 27
XIN / XEXT
I
Test port of IC.
28
GND
­
GND (0V).
29
VDD
­
Power supply (+5V).
30, 31
A6, 7
O
Address 1~5 outputs of extra RAM.
32
GND
­
GND (0V).
33
VDD
­
Power supply (+5V).
34
A12
O
Address 12 outputs of extra RAM.
35
A14
O
Address 14 outputs of extra RAM (MSB).
36
WEB
O
Write enable signal of extra RAM. L = active.
37~39
A13 / 8, 9
O
Address 13, 8, 9 outputs of extra RAM.
40
GND
­
GND (0V).
41
A11
O
Address 11 outputs of extra RAM.
42
OEB
O
Output enable signal of extra RAM. L = active.
43
A10
O
Address 10 outputs of extra RAM.
44~51
DB7~0
I/O
Data port of extra RAM. Data bus7~0.
52
VDD
­
Power supply (+5V).
53
GND
­
GND (0V).
54
TI1
I
Test port of IC.
55
VIN
I
VCXO input.
56
VOUT
O
VCXO output.
57, 58
TI2, 3
I
Test port of IC.
4
CIRCUIT
DESCRIPTION
DEM-9991D
Pin description
DEM-9991D(J,K)
COVER(
98.4.25
0:09
AM
y[W
6


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A
B
D
C
E
2
1
3
5
7
4
6
I
G
O
I
G
O
DIGIT
AL
OUTPUT
RF
INPUT
DIGIT
AL
INPUT
DC
IN
INPUT
SW
E
E
B
E
B
B
E
B
E
B
1
1
1
30
80
51
1
7
14
8
31
50
100
81
14
28
15
4
8
5
Refer to the schematic diagram for the value of resistors and capacitors.
PC BOARD(Component side view)
5
DEM-9991D(J,K) COVER( 98.4.25 0:09 AM y[W 5


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A
C
E
B
D
2
1
3
5
7
4
6
LOCK
DTC114EUA
200mA
U1BC44
:
D18
B30-2509-05
:
D16
UDZ5.1B
:
D15
B30-2510-05
:
D11
DA204U
:
D3-5
MA111
:
D1,2,12-14,17
2SB1424(Q,R)
:
Q9
DTC124EUA
UN5212 or
:
Q8,10
UN5211 or
:
Q6,7
DTA113ZUA
UN5119 or
:
Q5
2SA1036K(Q,R)
:
Q2,4
2SC2714(O,Y)
:
Q1,3,11
UPC7805AHF
TA7805S or
:
IC6
UPC7808AHF
TA7808S or
:
IC5
NJM2100M
:
IC4
TC74HCU04AF
:
IC3
HM62256BLFP-8T
:
IC2
PM4007A
:
IC1
A2
COAX.
DIGITAL
OUTPUT
(AC-3 RF)
RF INPUT
INPUT
DIGITAL
COAX.
INPUT
INPUT
OPT.
DC12V/
J2
DC IN
RESET
S1
ON
ON
(2/2)
POWER
ON/OFF
L7
+8V AVR
OFF
D18
+5V AVR
POWER SW
(RED)
(GRN)
Q7
Q6
D4
(1/2)
(2/2)
IC4
D1
D2
INPUT SW
D3
COAX.
OPT.
OFF
D14
D13
D11
D12
D15
D5
Q9
INVERTER
Q5
DETECT
DUTY
(1/2)
IC4
LOCK
POWER
ON/OFF
POWER
LED
D16
Q8
Q3
Q4
16dB
RF AMP
B.P.F.
2.88MHz
L6
Q11
Q1
Q2
S1
DRIVER
COAX
J1
(SRAM)
ERROR CORECT
DATA HOLD
RF DEMODULATOR
DOLBY DIGITAL/AC-3
20dB
RF AMP
Q10
D17
DEM-9991D
(X88-1060-10)
IC5
IC6
IC3
IC2
IC1
0V
5.0V
5.0V
0.8V
0V
0V
2.7V
2.5V
5.0V
5.0V
10.3V
11.5V
12.2V
12.1V
12.1V
8.1V
2.0V
5.0V
0V
0V
0V
0V
0V
0.6V
2.4V
7.1V
3.9V
5.0V
4.6V
0V
7.0V
2.5V
1.8V
7.7V
+B LINE
5.0V
4.8V
4.3V
5.0V
2.4V
2.4V
2.5V
0V
5.0V
4.9V
2.5V
2.4V
0V
5.7V
5.8V
5.5V
5.4V
4.0V
7.7V
3.7V
1.7V
4.9V
4.9V
5.0V
0V
5.0V
5.0V
1.7V
2.2V
5.0V
2.5V
2.5V
5.0V
2.0V
5.0V
1.2V
1.2V
5.0V
0V
1.2V
1.2V
5.0V
0V
1.2V
1.2V
5.0V
0V
0V
0V
0V
0V
5.0V
5.0V
5.0V
0V
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
5.0V
1.9V
5.0V
5.0V
1.6V
0V
0V
5.0V
0V
5.0V
4.9V
1.2K
R60
R2
+5V
R71
15 1W
+B
C65
0.047
0.1
C30
L9
89
88
78
78
88
89
+8V
+8V
+8V
+8V
+8V
+8V
+8V
+8V
+8V
+8V
+8V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+5V
+B
+B
+B
+B
+B
47
+B
SIGNAL LINE
GND LINE
1
2
3
0.1
330
1K
R73
100K
4.7K
R24
IN
OUT
GND
0.1
C56
47u25
C64
+
C63
C62
0.1
47u25
+
IN
GND
OUT
C61
0.1
C60
47u25
+
0.1
C55
C54
47u25
+
L4
C59
0.1
0.1
L5
C57
47u25
+
C58
R72
100
R77
R3
R33
220K
C21
0.47
4
8
R35
10K
1
3
+
-
2
10K
R54
0.1
R53
R52
10K
10K
-
+
7
6
5
R51
10K
A1
C42
0.1
15P
R55
C44
R56
C43
47K
0.01
+
10u50
C45
120
0.1
C25
11K
R63
R62
1.2K
R68
560
R31
10K
C22
0.47
R34
220K
R32
10K
C41
R70
1.5K
R69
2.2K
C11
0.1
R19
82
1.8K
R21
C10
0.1
R20
1.1K
1K
R16
R18
560
R17
200
R14
R13
R15
3.3K
+
C9
47u10
5.1K
12K
C8
0.1
R12
1.5K
OUT
IN
GND
C6
0.1
1K
R11
C7
0.1
R8
82
R5
1K
1K
R27
R26
1K
C16
82P
68uH
R25
47
1.2K
R9
R10
2.7K
C5
0.1
R7
330
R6
510
R4
C4
C3
0.1
+
100u10
1K
3.3K
1.5K
C2
0.1
R1
82
C13
47P
47P
C24
C26
R39
L3
C33
220P
47K
R42
C29
22P
R43
4.7K
VCC
GND
14
13
12
10
9
8
11
1
2
3
5
6
7
4
1/4W
R40
75
C27
47P
15
R41
L8
C28
0.1
C1
0.1
R44 75
L1
L2
C32 47P
R23
10
C14
0.1
C15 0.1
1
3
2
C31
0.1
R38
C71 0.1
C70
0.1
C69
0.1
C72
0.1
C23
0.1
R37
4.7K
R36
4.7K
100
R78
49
50
51
49
50
51
21
20
0.1
C66
0.1
C67
C68
0.1
R76
10K
30
22
21
19
20
18
17
GND
VDD
GND
VDD
GND
XEXT
XIN
TM3
TM2
XOUT
TM1
MSYC
DRY
DEN
ECCK
TM0
IDO
IDCK
IDST
MLTB
MCK
DATA
RESET
VDD
GND
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
VCC
WE
A13
A8
A9
A11
OE
A10
CS
I/O7
I/O6
I/O5
I/O4
I/O3
28
27
26
25
24
23
22
21
20
19
18
17
16
15
AVDD
AGND
TM4
DIN
VDD
SYST0
SYST1
WINGT
GND
ADST0
ADST1
BUNRI
TM5
AVDD
AGND
TI8
GND
VDD
76
77
79
78
80
75
72
73
74
71
30
29
28
27
25
26
24
23
22
21
TI1
TI2
TI4
VDD
GND
TI3
TLDB
TCK
TRP
TDO
TI5
VLDY
DASYO
CREAT
ADRRES
TIMING
CREAT
11K
R64
+
C51
47u25
C12
0.1
R22
1K
46.08MHz
OSC
1/2048
f/n
1/2
S/P
SYNC
DETECT
PROTECT
DEMODULATOR
ERROR
CORRECT
PHASE
COMPARATOR
CONTROL
DAI
SW
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
19
18
17
30
22
R74
10K
R75
100K
-
+
(
)
(
)
(
)
)
(
)
(
)
(
(
(
)
)
(
)
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
(
(
)
)
(
)
(
)
(
)
(
)
(
)
(
)
(
Y13-2060-10
DEM-9991D
CAUTION: For continued safety,
replace safety critical compo-
nents only with manufacturer's
recommended parts (refer to
parts list).
indicates safety criti-
cal components. For continued
protection against risk of fire,
replace only with same type and
rating fuse(s). To reduce the risk
of electric shock, leakage-current
or resistance measurements
shall be carried out (exposed
parts are acceptably insulated
from the supply circuit) before the
appliance is returned to the cus-
tomer.
The DC voltage is an actual
reading measured with a high
impedance type voltmeter. The
measurement value may vary
depending on the measuring
instruments used or on the prod-
uct.
UN5119
UN5211
2SA1036K
2SC2714
UPC7805AHF
UPC7808AHF
DA204U
UN5212
TC74HCU04AF
TA7805S
PM4007A
TA7808S
DEM-9991D(J,K) COVER( 98.4.25 0:09 AM y[W 7