NAD C730 User manual
NAD
SERVICE MANUAL
C 730
STEREO
RECEIVER
C 730
STEREO
RECEIVER
2
SERVICE SAFETY PRECAUTIONS
1. Replacing the fuses
CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY
WITH SAME TYPE OF FUSE.
Reference No Part Number Description
M151 *AH 5120-0037-0 FU T3.15A 250V UL/CSA 5X20MM
M152 *C 5100-2530-1B T2.5A/250V IEC
M154 *AH 5120-0052-0 FUSE T1.6A 250V 5X20MM UL/CSA
NOTE:
<*AH > : USA, CANADIAN MODEL ONLY.
<*C > : EUROPEAN MODEL ONLY.
2. Safety check out
(Only U.S.A. model)
Before returning the product to the customer, make leakage current or resistance measurements
to determine that exposed parts are acceptably insulated from the supply circuit.
Parts marked with the symbol are critical with regard to the risk of fire and electric shock.
Replace only with parts recommended by the manufacturer.
CONTENTS
DESCRIPTION PAGE
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4
REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11
IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-14
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-19
IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-23
ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-33
EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35-36
PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
3
SPECIFICATIONS
POWER AMPLIFIER SECTION
1. Rated Distortion
(THD 20Hz-20KHz, 30W, 8 ohm) ≤0.08%
(THD 1KHz, 30W, 4 ohm) ≤0.1%
2. Input Sensitivity (ref. 30W 8 ohm, 1KHz) 350+/-30mV
3. S/N Ratio (A-wtd, 1K ohm, 500mV CD in, 1KHz) ≥-85dB
4. Frequency Response (500mV CD in, 1W, 20Hz-20KHz) 0±0.8dB
5. Channel Balance
Volume maximal output 30W (ref), 1KHz ≤1dB
1dB to -40dB, 1KHz ≤2dB
-41dB to -50dB, 1KHz ≤3dB
6. Audio Muting at 1KHz ≥-52dB
7. Headphone Output in 0.1% (600 ohm load, 500mV CD in, 1KHz) ≥10V
8. Crosstalk (2V input, 10W, 1KHz) ≤-63dB
PRE - AMPLIFIER SECTION
1. Rated Distortion (THD, 2V CD input, 4V output, 1KHz) ≤0.08%
2. Frequency Response (500mV CD in, 20Hz-20KHz) 0±0.08dB
3. S/N Ratio (A-wtd, 500mV CD in, 1KHz) ≥-85dB
4. Tone Control Response
Bass (500mV in,1W out ,100Hz) boost / cut 9±2dB
Treble (500mV in,1W out ,10KHz) boost / cut 9±2dB
AM TUNER SECTION
Frequency Range: AH 530 - 1710 KHz Step 10 KHz
C 531 - 1602 KHz Step 9 KHz
Input level is expressed as the reading in open-circuit
of 75-ohm source impedance signal generator.
1. Usable Sensitivity (999/1000KHz) ≤30dBµV
2. S/N Ratio (5mV input) ≥38dB
3. THD (5mV input) ≤3%
4. IF Rejection (450KHz) ≥36dB
5. Image Rejection (F+2xIF) ≥28dB
6. Selectivity ≥17dB
7. Output 130mV±26mV
8. Loop Sensitivity (20dB S/N) 999/1000KHz ≤66dB
603/600KHz ≤66dB
1404/1400KHz ≤66dB
9. Frequency Response (100-2.3KHz, 5mV) 0±6dB
4
FM TUNER SECTION
Frequency Range: AH 87.5 - 108 MHz Step 50 KHz
C 87.5 - 108 MHz Step 50 KHz
Input level is expressed as the reading in open-circuit
of 75-ohm source impedance signal generator. *C *AH
1. Usable Sensitivity (Mono, 98MHz) ≤15dBµ ≤15dBµ
2. S/N Ratio (60dBµ, IHF wtd) Mono ≥72dB ≥72dB
Stereo ≥66dB ≥66dB
3. THD (60dBµ, L=R, 75KHz Dev. for AH, 40KHz Dev. for C)
Mono ≤0.3% ≤0.3%
Stereo ≤0.35% ≤0.35%
4. IF Rejection (10.7MHz) ≥78dB ≥65dB
5. Image Rejection (119.4MHz) ≥85dB ≥85dB
6. Capture Ratio (40dBµ) ≤3dB ≤3dB
7. AM Suppression (60dBµ, 100%mod FM, 30%mod AM) ≥48dB ≥48dB
8. Pilot Suppression (60dBµ) ≥60dB ≥60dB
9. Frequency Response
(60dBµ, 20Hz - 15KHz in, 75µS for AH, 50µS for C and 0±1.5dB 0±1.5dB
Japan)
10. Channel Separation (60dBµ, IHF wtd) 100Hz ≥30dB ≥30dB
1KHz ≥38dB ≥38dB
10KHz ≥30dB ≥30dB
11. Alternate Channel Selectivity (±400KHz, IHF) ≥60dB ≥45dB
12. Muting Level 18±3dBµ 18±3dBµ
13. Output 750mV±150mV 500mV±100mV
14. Blend on Separation (60dBµ IHF wtd) 6±2dB 6±2dB
15. RDS Decode Sensitivity ≤26dBµ ≤26dBµ
16. Auto-search Sensitivity OFF ≤15dBµ ≤15dBµ
ON ≤24dBµ ≤24dBµ
PHYSICAL SPECIFICATIONS
Dimensions (Width x Height x Depth) 435 x 109 x 305 mm
Net weight 7.2 kg (15.87 lbs)
Shipping weight 9.2 kg (20.5 lbs)
5
REAR PANEL / FRONT PANEL
REAR PANEL
FRONT PANEL
1. POWER ON / OFF
2. STAND-BY INDICATOR
3. BLEND
4. MEMORY
5. FM MUTE / MODE
6. AM / FM
7. DISPLAY
8. PRESET / TUNE
9. PRESET / TUNE AND
10. DISPLAY AREA
11. VOLUME
12. HEADPHONE SOCKET
13. INPUT SELECTORS
14. BASS & TREBLE
15. TONE DEFEAT
16. BALANCE
1. FM ANTENNA
2. AM ANTENNA
3. DISC INPUT
4. CD INPUT
5. VIDEO INPUT
6. AUX INPUT
7. TAPE 2 IN, OUT
8. TAPE 1 IN, OUT
9. PRE OUT
10. NAD-LINK IN, OUT
11. SOFT CLIPPING
12. 12V TRIGGER OUT
13. SPEAKERS
14. AC LINE CORD
15. SWITCHED AC OUTLET (AH version only)
6
DISASSEMBLY INSTRUCTIONS
1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels.
Remove tapping screw 3.0 x 8.5 ( 5 ) from the back panel.
Refer to Figure No.1.
Figure No.1
2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35˚ and then remove
in the direction as indicated by the arrow 7 . Refer to Figure No.2.
Figure No.2.
5
4
3
1
2
7
6
6
7
BLOCK DIAGRAM
AM LOOP ANT FM ANT
FRONT END
ENV172D3G1
VFD
Protect
L R
CPU
KEY MATRIX
Trigger Out
REMOTE
SENSOR
CD
DISC
VIDEO
AUX
TAPE-1
OUT
TAPE-2
OUT TC9273
TAPE-2
IN
PRE OUT
TAPE-1
IN (Mon)
S1 1
12 17
PLL LC72723M
AM/FM IF
LA1837 TUNER
DIODE
MATRIX
NAD LINK
IN-OUT
MAIN
POWER
SUPPLY
SPEAKER
OUT
STAND BY
POWER
SUPPLY
RELAY
RELAY
POWER
AMP.
+5V CPU
AC INPUT
AC INPUT
VT
VT
ce data clk RDS-CLK RDS-SIG RDS-DATA
data
out
(#1)=Power On
(#2)=Protect (Flash 2Hz)
(#1)+(#2)=Standby
(#1)
(#2)
LC7218
Locking SW,
Tone defeat
ST/MO, MUTE, SMETER
TUNE
FM
OSC/IF AM
OSC/IF
OUT
AUDIO
AUDIO IN
IN
S2
S3
S4
S5
S6
S7
S8
S9
S10
VOLUME
MOTORIZE MUTE
8
WIRING DIAGRAM
MAIN BOARD
TRANSFORMER
SECONDARY BOARD
KEY BOARD
PSU BOARD
SPEAKER BOARD
BLACK
6PIN BLACK 6PIN BLACK
35PIN BLACK
BROWN
BLUE
3PIN BLACK
3PIN BLACK
RED
AC INPUT
BLUE
3PIN BLACK
4PIN BLACK
BLACK
BLACK
BLUE
GREEN
TUNER BOARD
POWER SWITCH BOARD
PHONE BOARD
LED BOARD
PRIMARY BOARD
P32
P39 P40 P41 P42 P43 P44 P45 P46 P47 P48
P33 P34 P35 P36
OSC RF
Testing
Point
TP2
Testing
Point
TP1
Testing
Point
TP3
Testing
Point
TP4
9
ADJUSTMENT POINTS DIAGRAM
1. TUNER
2. MAIN BOARD
FM
SIGNAL
GENERATOR
OUTPUT
TERMINAL OUTPUT
TERMINAL
DISTORTION
ANALYZER
DISTORTION
ANALYZER
AC
VOLTMETER
OSCILLOSCOPE
AC
VOLTMETER
OR
OSCILLOSCOPE
AC
VOLTMETER
OR
OSCILLOSCOPE
OUTPUT
TERMINAL
OUTPUT
TERMINAL
L
R
ANTENNA
TERMINAL
ANTENNA
TERMINAL
ANTENNA
TERMINAL
AM LOOP
ANTENNA
(Accessory)
AM LOOP
ANTENNA
60cm
DIGITAL
MILLIVOLT
METER
VT
J911,
GND
FM
SIGNAL
GENERATOR
AM
SIGNAL
GENERATOR
FM
SIGNAL
GENERATOR
RDS
GENERATOR
FM
STEREO
GENERATOR
P901
DC
MILLIVOLT
METER
UNIT
UNIT
UNIT
UNIT
INSTRUMENT SETUP
1. FM MEASUREMENT
Fig. 1
Fig. 2
2. RDS MEASUREMENT
Fig. 3
3. AM MEASUREMENT
Fig. 4
10
ALIGNMENT PROCEDURES
AMPLIFIER SECTION
Step Item Connection Adjustment Adjust for
1 Left Channel Voltmeter to TP1, TP2 on Amp Board R868 2mV±0.2mV
2 Right Channel Voltmeter to TP3, TP4 on Amp Board R867 2mV±0.2mV
11
FM/RDS SECTION
INPUT
- FM mono: 1kHz, 75kHz devi., 60dB/µV
- FM stereo: 1kHz, 67.5kHz devi., 60dB/µV
Pilot signal 19kHz 7.5kHz devi.
OUTPUTS
- Connect the non-inductive type resistor of 8 ohms to all
speaker terminals otherwise noted.
Item
FM
IF/RF
Stereo
Distortion
Stereo
Separation
Muting
Level Signal
output
Step
1DC voltmeter L941 0±100mV
3Distortion
analyzer
Distortion
analyzer
Oscilloscope
Oscilloscope
L942
R956
R941
Minimum
Minimum
2 AC voltmeter IFT on the
front end
IFT on the
front end
Maximum
Maximum
separation
Connection
of instrument
Fig.1 –
–
Fig.2
Fig.2
Fig.1
Channel L
or R 1kHz
99.0MHz
1kHz 75kHz devi.
65dBf (60dB)
99.0MHz Ext.
mod. 65dBf
(60dB)
FM SG
output Stereo mod-
ulator output Tuning
frequency
99.0MHz
99.0MHz
Channel L
or R 1kHz
99.0MHz Ext.
mod. 65dBf
(60dB)
99.0MHz
mod. 65dBf(60dB)
RDS 2% MOD
99.0MHz
1KHz 75KHz devi
33dBµ
99.0MHz
mod.65dBf(60dB)
99.0MHz 18dB
99.0MHz
99.0MHz
Pilot
Suppression
Signal
Strength
Indicator
RDS
MIN
7 bars just
lit
VTVM
VFD Signal
Bars
L903 FOR L
L904 FOR R
R991
Channel L or
R pilot on
signal
–
Fig.2
Fig.1
Fig.3
99.0MHz
99.0MHz
–– – –
99.0MHz
Output
indicator Adjustment
point Adjust
for Remarks
FM MUTE/MODE
switch: ON/AUTO
Repeat the steps
1 to 3 until no fur-
ther adjustment is
necessary.
FM MUTE/MODE
switch: ON/AUTO
Don’t turn more
than +/-180˚
Repeat stereo
distortion and
stereo separation
alignment until
THD at minimum
and separation at
maximum.
Adjust such that
output just unmute
Decode the RDS-
program station
AM SECTION
AM Modulation: 400Hz, 30%
For AH Version
Step
1 –
2
3
530kHz
600kHz
990kHz
600kHz
400Hz 30% mod.
60dB/m
AM SG
output Tuning
frequency Output
indicator Adjustment
point
600kHz
400Hz 30% mod.
60dB/m
AC
voltmeter
AC
voltmeter
Digital
DC
voltmeter
L972
OSC coil
on RF
block M971
RF coil
on RF
block M971
Adjust
for
1.35±0.2V
Maximum
Maximum
Step
1 –
2
3
522kHz
or
531kHz
603kHz
999kHz
600kHz
400Hz 30% mod.
60dB/m
AM SG
output Tuning
frequency Output
indicator Adjustment
point
600kHz
400Hz 30% mod.
60dB/m
AC
voltmeter
AC
voltmeter
Digital
DC
voltmeter
L972
OSC coil
on RF
block M971
RF coil
on RF
block M971
Adjust
for
1.3±0.2V (522kHz)
1.35±0.2V (531kHz)
Maximum
Maximum
For C Version
IMPORTANT NOTES
1. Show the software version
Press “PRESET/TUNE” and
“TUNE UP”.
2. Light UP all the icon on the
VFL
Press “PRESET/TUNE” and
“TUNE DOWN”.
3. CPU Resets
Press “PRESET/TUNE” and
“TUNE DOWN” and any one
key.
4. AM Step 10K/9K Change
Add or delete the AM step
jumper - J201 in the key PCB.
PCB LAYOUT
KEY BOARD
TOP VIEW BOTTOM VIEW
PHONE BOARD
LED BOARD
SECONDARY BOARD
PRIMARY BOARD
12
13
MAIN BOARD
14
TUNER BOARD PSU BOARD
POWER SWITCH BOARD
SPEAKER BOARD
1615
MAIN BOARD
SCHEMATIC DIAGRAM
NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W
UNLESS OTHERWISE SPECIFIED.
2. CERAMIC CAPACITORS ARE 50V 10%
UNLESS OTHERWISE SPECIFIED.
17 18
TUNER BOARD
NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W
UNLESS OTHERWISE SPECIFIED.
2. CERAMIC CAPACITORS ARE 50V 10%
UNLESS OTHERWISE SPECIFIED.
19
KEY BOARD
S10
S11
S12
S13
S14
S01
S02
S03
S04
S05
S06
S26
S07
S08
S09
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S01
S03
S04
S05
S06
S07
S08
S09
S10
S11
S12
S13
S14
S15
S16
S18
S19
S20
S22
S23
S24
S33
AC4V8_1
AC4V8_2
AC4V8_2
AC4V8_1
S25
S25
AC4V8_1
AC4V8_2
S02
S21
S25
S33
+13V
STANDBY RELAY
S17
+5V
+5V
S26
S25
-VP
+5V6
-VP
N/A
NAD
N/A
N/A
TONE IN
NAD IN
RESET
HEAD_P IN
XT_2
VSS_1
6M_CF
6M_CF
VDO_1
A/D 0
A/D 1
A/D 2
4.4V DETECT
PROTECT IN
RDS SIGNAL
FA SMETER
AM SMETER
TRIGGER IN
RDS CLK IN
REMCON
10G
9G
8G
7G
6G
5G
4G
3G
2G
1G
P18
P17
P16
P15
P14
P13
VDO
-30V
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
N/A
OPTION INPUT
FM STEREO
RDS DATA
FM SD
RSD SELECT
AM STEP
FM STEP
MODEL
TONE
SPK RELAY
MUTE
TUNER MUTE
STANDBY RELAY
VOL. UP
VOL. DN
11 LED
12 LED
VSS_2
9273/7218 DATA OUT
7218 DATA
9273/7218 CLK
9273 STB
EE_DATA OUT
7218 CE
EE_CLK OUT
1
2
3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
1
2
3
1
2
3
1
2
3
4
17
OUT
SELECT
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
19
20
21
22
23
24
25262728293031323334353637383940
OUT
U201
LC866448
R258
22K R259
22K
C208
47u/16V
M216
BLEND
M210
FM MUTE
M207
FM/AM
M201
TUNE
M213
MEMORY
M202
DISC
M206
TUNE DN
M203
DISPLAY
M219A
6MHz
CST6.00MGW
R257
22K
R232
10K
D209
1N4148
D202
1N4004
R231
22K
D204
1N4148
D205
1N4148
D206
1N4148
D207
1N4148
R252 10K
R253 10K
R254 10K
R255 10K
R256 10K
R281 10K
R282 10K
R283 10K
R284 10K
R285 22K
R286 22K C205
0.1u
R230
22K
R219 1K
R218 1K
J201A
TO LED BD
R201
820
R204 820
R207
1K8
R210
2K2
R213
4K7
M217
TAPE1_MON
M215
TAPE2
M211
AUX
M208
VIDEO
M205
CD
M214
TUNER
R208
1K8
R211
2K2
R214
4K7
R216
6K8
R202
820
R205
820
R203
820
R291
10K
R292
10K
R293
10K
C203
100u/6V3
C204
0.01u
J206A
35PIN
RDS CLK IN
TRIGGER
AM SMETER
FM SMETER
RDS SIGNAL
PROTECT IN
TONE IN
7218 CE
9273 STB
9273/7218 CLK
7218 DATA
9273/7218 DATA OUT
VOL DN
VOL UP
+13V
TUNER MUTE
MUTE
SPK RELAY
FM SD
RDS DATA
FM STEREO
-30V
5V6
M220
DISPLAY
R263 100K
R264 100K
R265 100K
R266 100K
R267 100K
R268 100K
R269 100K
R270 100K
R271 100K
R272 100K
R273 100K
R274 100K
R241 100K
R242 100K
R243 100K
R244 100K
R245 100K
R246 100K
R233 10K
R234 10K
R235 10K
R236 10K
R237 10K
R238 10K
R239 10K
R240 10K
R247 10K
R248 10K M218
PIC-12043TE2
REMOTE SENSOR
L201
22uH
D203
5V6 1/2W R220
470R
R221
470R
R222
470K
D201
1N4148
C201
100u/6V3
C202
0.01u
J104B
AC POWER
R215
820
M209
TUNE UP
GREEN
RED
J101
TO POW
D210
1N4148
C206
10U/16V
R260
470R
D211
5V1
GREEN=ON
GREEN+RED=STDBY
NAD IN
NAD OUT
TONE OUT
HEAD-PIN
D_GND
5V1
R294
4.7K
1
2
3
4
5
6
7
8
U202
24C08
NOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W
UNLESS OTHERWISE SPECIFIED.
2. CERAMIC CAPACITORS ARE 50V 10%
UNLESS OTHERWISE SPECIFIED.
S37/PE5
P00
P01
P02
P03
P04
P05
P06
P07
VSS2
P10/SO0
P11/SI0/SB0
P12/SCK0
P13/SO1
P14/SI1/SB1
P15/SCK1
P16/BUZ
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
S15/T15
S14/T14
S13/T13
S12/T12
S11/T11
S10/T10
S9/T9
S8/T8
S7/T7
S6/T6
S5/T5
S4/T4
S3/T4
S2/T2
S1/T1
S0/T1
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
S36/PE4
S35/PE3
S34/PE2
S33/PE1
S32/PE0
S31/PD7
S30/PD6
S29/PD5
S28/PD4
S27/PD3
S26/PD2
S25/PD1
S24/PD0
S23/PC7
S22/PC6
S21/PC5
S20/PC4
S19/PC3
S18/PC2
S17/PC1
S16/PC0
VP
VDD2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
P17/PWM0
P30
P31
P32
P33
P70/INT0
RES
XT1/P74
XT2/P75
VSS1
CF1
CF2
VDD1
P80/AN0
P81/AN1
P82/AN2
P83/AN3
P84/AN4
P85/AN5
P86/AN6
P87/AN7
P71/INT1
P72/INT2/T0IN
P73/INT3/T0IN
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
Interrupt Control IR
EPROM(48KB)
EPROM
Control
A15-A0
D7-D0
TA
CE
OE
DASEC
PC
ACC
B Register
C Register
PSW
RAR
RAM
Stack Pointer
Watch Dog Timer
Port 0
ALU
PLA
Stand-by Control
CF
Clock
Generator
RC
X'tal
Bus Interface
SIO0
BASE TIMER
Port 1
SIO1 Port 3
Timer 0 Port 7
Timer 1 Port 8
ADC
VFD Controller
RAM 128bytes
Real Time
Service
High Voltage
Output
INT0-3
Noise Filter
20
IC BLOCK DIAGRAM
U201: LC866448B
21
U202: 24C08
VCC 8
7
4
6
5
3
2
1
GND
WP
SCL
LOAD
LOAD INC
DATA WORD
ADDR/COUNTER
Y DEC
X DEC
R/W
COMP
SERIAL
CONTROL
LOGIC
EN H.V. PUMP/TIMING
DATA RECOVERY
EEPROM
SERIAL MUX
DOUT/ACK
LOGIC
DEVICE
ADDRESS
COMPARATOR
START
STOP
LOGIC
SDA
A2
A1
A0
DIN
DOUT
2S1
1
VSS
26
VDD
27 S1
3S2 26 S2
4S3 25 S3
5S4 24 S4
6S5 23 S5
7S6 22 S6
8S7 21 S7
9S8 20 S8
10S9 19 S9
11S10 18 S10
12S11
13
GND
14
CK
15
DATA
16
STB
17 S11
(L-ch)
10bit
Latch
Circuit
LEVEL SHIFT + SHIFT RESISTER
CIRCUIT
(R-ch)
10bit
Latch
Circuit
(Same
as L-ch
Circuit)
U401: TC9273N
22
U901: LA1837
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
ALC AM
OSC
AM
MIX
AM
RF.AMP
REG
AGC
AM IF
AM
S-METER
TUNING
DRIVE
STEREO
DRIVE
VCC
VCC
AM/FM
IF-BUFF
FM
S-METER S-CURVE
AM IF FM
DET
GND
FM IF INPUT
AM MIXER
OUTPUT
FM IF INPUT
BYPASS
AM IF INPUT
GND
TU-LED
ST LED
AM-IF OUTPUT
FM DETECTOR
AM NARROW CF
FM S-METER
OUTPUT
AM S-METER
OUTPUT
MUTE
FM/AM
SWITCH
PILOT VCO
SD
COMP
DET
BUFF
DECODER
ANTI-BIRIDE
3 rd 5 th
STEREO
SW
MUTE
VCO
304kHz
FF
38k
P-DET
¯
FM SD
ADJ
OSC
REG
AM RF
INPUT
AFC
AM AGC
AM DETECTOR
INPUT
FM DETECTOR
OUTPUT
MPX
IUTPUT
MPX
OUTPUT
MPX
OUTPUT
STEREO L
INPUT
STEREO R
INPUT
L-OUT
R-OUT
FF
19k
FF
19k
PILOT
DET
U603: NJM78M
1
INPUT 3
OUTPUT
2
GND
AMPLIFIER 1
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT
V Ð
AMPLIFIER 2
V +
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT
1
2
3
4
8
7
6
5
+ ÐÐ +
U501: NJM4558D
U702, U703: NJM5532
U704: TL072CP
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