JBL JSR-400 User manual

JSR-400
Dolby Pro-Logic Audio/Video
ReceiverSurround
JBL Consumer Products Inc.
250 Crossways Park Drive
Woodbury, N.Y. 11797
1-800-336-4JBL in the USA
A Harman International Company
Rev A 10/99
SERVICE MANUAL
The is part of the
System
JSR-400
ARC CinemaII

2
Dolby Pro-LogicÒA/V Receiver JSR-400
JSR400 TABLE OF CONTENTS
COVER...........................................................................1
TABLE OF CONTENTS.................................................2
ARC CINEMA II SPECIFICATIONS ..............................2
SPECIFICATIONS..........................................................3
CONTROLS AND THEIR FUNCTION...........................7
REAR PANEL CONNECTIONS.....................................9
DISASSEMBLY PROCEDURES .................................10
CIRCUIT DESCRIPTION .............................................13
JSR400 PACKING .......................................................17
JSR400 BLOCK DIAGRAM .........................................18
JSR-400 UNIT EXPLODED VIEW ..............................19
JSR-400 ELECTRICAL PARTS LISTS .......................20
SIMPLE TROUBLESHOOTING...................................26
MORE COMPLEX TROUBLESHOOTING ..................27
TUNER ALIGNMENT ...................................................29
JSR-400 MAIN PCB ...................................................31
JSR-400 CONTROL PCB ............................................32
JSR-400 TUNER PCB .................................................33
JSR-400 SUB PCBs ....................................................34
WIRING DIAGRAM ......................................................35
INTEGRATED CIRCUIT DIAGRAMS 1-5 ..............36-40
TRANSISTOR DIAGRAMS..........................................41
JSR-400 SCHEMATIC DIAGRAM
MAIN BOARD...............................................................42
JSR-400 SCHEMATIC DIAGRAM
CONTROL BOARD ......................................................43
JSR-400 SCHEMATIC DIAGRAM
POWER SUPPLY/
VIDEO/TONE/
HEADPHONE/
VOLUME PCB’s ...........................................................44
JSR-400 SCHEMATIC DIAGRAM
TUNER BOARD ...........................................................45
ARC CINEMA II SPECIFICATIONS
Total System Output ..........280watts
Front Channels: ............50watts x 3 @ .1% THD;
Surround Channels:...........25watts x 2 @ .1% THD;
Subwoofer: ..............80watts x1@1%THD
System Frequency Response ......(–6dB) 45Hz – 20kHz
Input Impedance ............20kohms
Input Sensitivity ............220mV
Receiver
Dimensions (HxWxD) ........4-5/8 x 10-1/4 x 9-3/4 inches
....................117x260x248mm
Weight ................5lbs/2.3 kg
Occasional refinements may be made to existing products without notice, but will always meet or exceed original
specifications unless other-wise stated.

3
Dolby Pro-LogicÒA/V Receiver JSR-400
SPECIFICATIONS
Measuring methods are based on IHF and IEC standard 268-3
Measurement conditions, unless otherwise noted:
Output resistive load = (8) ohms / Both channels driven
Tone (Base, Treble), Balance, EQ control : Center Position, Other SW’s : OFF
Nominal input level: 5mV for MM, 0.5mV for MC, 500mV for general purpose inputs
Power figures should be kept minimum 10 minutes between 15 and 35°C
Terminator: 100 ohm for MC, 1kohm for MM for MM and general purpose inputs
Filter: IHF-A filter
R/O = Rated Output
Power Supply: 120V, 60Hz
Front Amp Section
NO. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL L/R L R
1INPUT SENSITIVITY
CD 1kHz mV 200±30 200±30
MM 1kHz mV
MC 1kHz mV
MIC 1kHz mV
2CHANNEL BALANCE CD 1kHz R/O TO -40dB dB ±3±2
1kHz
4RESIDUAL NOISE CD 1kHz VOL min. mV £1
1kHz VOL max. mV
5TOTAL HARMONIC
DISTORTION CD (500mV)
(40)Hz R/O / 1W % £1£0.3
1kHz R/O / 1W % £1£0.3
(20)KHz R/O / 1W % £1£0.3
6CONTINUOUS AVERAGE
POWER CD
(40)Hz (8)ohms W 50 52
1kHz (8)ohms W 50 52
(20)KHz (8)ohms W 50 52
7S/N RATIO, IHF-A FILTER
CD (500mV) 1kHz R/O dB ³65 ³70
1kHz 1W dB
MM (5mV) 1kHz R/O dB
1kHz 1W dB
MC (0.5mV) 1kHz R/O dB
1kHz 1W dB
8CHANNEL SEPARATION CD (500mV)
100Hz R/O-3dB dB
1kHz R/O-3dB dB ³45 ³55
10kHz R/O-3dB dB ³40 ³45
9FUNCTION CROSSTALK
TAPEÝAUX 1/10kHz R/O-3dB dB ³60/40 ³65/45
AUXÞTAPE 1/10kHz R/O-3dB dB ³60/40 ³65/45
MMÞCD 1/10kHz R/O-3dB dB
10 FREQUENCY RESPONSE
(-3DB) CD (500mV) 1W Hz~kHz 40~20k 20~50k
11 TONE CONTROL, ±(10)dB CD 100Hz 1W dB ±10±2±10±1
10kHz 1W dB ±10±2±10±1

4
Dolby Pro-LogicÒA/V Receiver JSR-400
Rear Amp Section
NO. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL L/R
1POWER OUTPUT 0.9% THD CD 1kHz (8) ohms W ³50 ³52
2TOTAL HARMONIC
DISTORTION CD 1kHz 1W % £1£0.7
3
S/N RATIO DOLBY
IHF-A FILTER, THEATER
HALL
STADIUM
CHURCH
CD R/O dB ³60 ³65
CD R/O dB
CD R/O dB ³60 ³65
CD R/O dB
CD R/O dB
4FRE RES. (ONLY DOLBY)
±3dB CD 1kHz 1W Hz~kHz 100~6 80~7
Center Amp Section
NO. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL L/R
1POWER OUTPUT 0.9% THD CD 1kHz (8) ohms W ³50 ³52
2TOTAL HARMONIC
DISTORTION CD 1kHz 1W % £1£0.3
3S/N RATIO IHF-A FILTER CD R/O dB ³73 ³78
4FRE RES. LARGE
DOLBY MODE SMALL
CD 1W Hz~kHz 50~15k 30~17k
CD 1W Hz~kHz 120~15k 100~17k
Video Section
NO. DESCRIPTION INPUT FREQ. REMARK UNIT LIMIT L/R NOMINAL L/R
1OUTPUT LEVEL at 75OHMS VCR1 (1Vp-p) 1MHz Vp-p 1±0.2 1±0.1
2FREQUENCY RESPONSE VCR1 (1Vp-p) 1MHz Hz~MHz DC~6 DC~6.3
3S/N RATIO VCR1 (1Vp-p) 1MHz dB 40 45
4CROSS TALK VCR1 (1Vp-p) 1MHz dB 40 45

5
Dolby Pro-LogicÒA/V Receiver JSR-400
TUNER
Measuring methods in conformity with IEC standard 315
Measurement conditions FM:
Radio frequency = 98.1 MHZ,
Audio frequency = 1 kHz
Reference level = 1mV on ( 75ohms, 300ohms)
Test Point: TP 1 = 90.1MHz, TP 2 = 98.1 MHz, TP 3 = 106.1 MHz
Filter = B.P.F at STEREO
Power Supply: 120V, 60Hz
FM Section
NO. DESCRIPTION UNIT LIMIT L/R NOMINAL L/R
1TUNING RANGE LOW ~ HIGH
STEP AUTO/Man.
MHz 87.5~107.9M
kHz 100
2
USABLE SENSITIVITY TP 1
S/N = 30dB TP 2
TP 3
dBf £23.2 £17.2
dBf £23.2 £17.2
dBf £23.2 £17.2
3FULL LIMITING SENSE OUTPUT =
-3dB dBf £15.2 £12.2
4AUTO STOP LEVEL dBf 31.2±531.2±3
5S/N RATIO MONO
IHF-A FILTER STEREO
dBf ³65 ³72
dBf ³59 ³70
6TOTAL HARMONIC DISTORTION MONO
STEREO
%£1£0.5
%£1.5 £1
750dB QUIETING SENS. MONO
STEREO
dBf £23.2 £20.2
dBf £45.2 £43.2
8
CHANNEL SEPARATION 250Hz
1kHz
6.3kHz
dBf ³20 ³40
dBf ³26 ³45
dBf ³18 ³35
9FREQUENCY RESPONSE AT ±1.5dB Hz 30~12.5k 20~15k
10 SPURIOUS RESPONSE dB ³60 ³70
11 IF REJECTION TP 1 dB ³60 ³70
12 IMAGE REJECTION TP 3 dB ³30 ³40
13 AM REJECTION RATIO dB ³25 ³30
14 ALTERNATIVE CH SELECTIVITY ±(400)KhZ dB ³55 ³65
15 OUTPUT LEVEL MONO mV 500±200 500±150

6
Dolby Pro-LogicÒA/V Receiver JSR-400
Measuring methods in conformity with IEC standard 315
Measurement conditions AM - MW: Radio frequency = 1000/999kHz
Audio frequency = 400Hz
LW: Radio frequency = 207kHz
Audio frequency = 400Hz
Reference level = 5mV/m, 10mV/m on 50ohms
Modulation = 30%
Test Point: MW TP1 = (600)kHz TP2 = (1000)kHz TP3 = (1400)kHz
LW TP1 = 162kHz TP2 = 207kHz TP3 = 252kHz
AM Section
NO. DESCRIPTION UNIT LIMIT L/R NOMINAL L/R
1
TUNING RANGE LOW ~ HIGH
MW
LW
STEP AUTO/Man.
kHz 520~1710
kHz
kHz 10
2
USABLE SENSITIVITY MW TP 1
TP 2
S/N = 20dB TP 3
LW TP 1
TP 2
TP 3
uV/m £800 £500
uV/m £800 £500
uV/m £800 £500
uV/m
uV/m
uV/m
3S/N RATIO MW
LW
dB ³35 ³45
dB
4TOTAL HARMONIC DISTORTION %£1.5 £1.0
5OVER LOAD DISTORTION 5mV 80% MOD %£10 £5
6FREQUENCY RESPONSE at -6dB MW
LW
Hz 100~2k 80~2.3k
Hz
7SELECTIVITY 10KhZ/9KhZ MW
LW
dB ³20 ³25
dB
8AGC FIGURE OF MERIT INPUT 100mV dB ³40 ³45
9IMAGE REJECTION MW = TP 3
LW=TP3
dB ³30 ³35
dB
10 FREQUENCY RESPONSE AT ±1.5dB %£15 £10
%£15 £10
11 AUTO STOP LEVEL MW
LW
uV/m 800(±6dB) 800(±5dB)
uV/m
12 TUNED LEVEL MW
LW
uV/m 800(±6dB) 800(±5dB)
uV/m
13 OUTPUT LEVEL mV 120±40 120±30

7
Dolby Pro-LogicÒA/V Receiver JSR-400
CONTROLS AND THEIR FUNCTION
DOLBY SURROUND
PRO LOGIC
l
JSR-400 AV RECEIVER
UP
DOWN
TUNING
AUTO
STEREO
PM
WIDE
MATRIXHALL
NORMAL
FM
AM
SIMULATED
PHANTOM BYPASS
TUNED
DELAY
CENTER
REAR
TIME
kHz
MHz
AUTO MUTE MEMORY
DOLBY SURROUND
PRO LOGIC
DOLBY 3 STEREO
CENTER MODE
PRESET
SPEAKERS OFF
mS
dB
ch
MODE
CENTER
TONE
TEST
BYPASS FM/AM CD TAPE VCR1 VCR2 AUX/TV
PRO LOGIC 3 STEREO
HALL
DOLBY DOLBY
L R MIN MAX
BALANCE BASS
MAXMIN
TREBLE
VCR 2
AUDIOLRHESDPHONES
SPEAKERS
VIDEO
POWER (STANDBY)
VOLUME
4
56
789
10 11 12 13 14 15 16 17 18 2019
1
3
25 24 22 21
23
2
1. Power: Once the unit is plugged in, it is in either
STANDBY or ON. This button switches from STANDBY to
ON, or can be operated from the remote control. In either
state the receiver is NOT disconnected from the AC main
power supply.
2. LED: In the STANDBY mode the LED is RED, when ON
the LED is Off.
3. Speaker Switch: Press this button to mute the output to
all speakers.
4. Headphone Jack: Normally the speaker switch (#3) is
pressed to mute speaker output for headphone listening.
5. Video 3 Input: Audio or Video sources connected to
these jacks may be selected by pressing the VCR2 button
(16).
6. Dolby Pro-Logic: Press this button to engage Dolby
Pro-Logic sound decoding. All five speakers are active in
this mode.
7. Dolby 3 Stereo: Press this button to engage Dolby 3
Stereo; only the front and center loudspeakers are active in
this mode.
8. Hall: Press this button to create a surround image from a
2 channel recording.
9. Center Mode: Press this button to change the center
speaker effect between NORMAL, WIDE and PHANTOM
when in the surround modes.
10. Test Tone: The test tone is used to calibrate the volume
settings of the speakers. A static noise will be heard
cycling, in order, from the front left, center, right, and both
surround speakers. When the test tone is cycling, you may
adjust the volume level of the center and surround speakers
with the CENTER LEVEL or REAR LEVEL buttons on the
remote control. Press the Test Tone button once more to
return to normal mode.
NOTE: The test tone is used to calibrate the performance of
the system. When listening to an actual recording, the
volume level of the surround channels is generally much
lower than that of the front channels. In fact, when listening
to a movie, virtually all of the dialogue and a substantial
amount of the effects are reproduced through the center
channel.
11. By Pass: Press this button to engage traditional 2
channel Stereo listening. Only the front speakers will be
active.
12. AM/FM Tuner Selector: Press this button once to
select the tuner. Press it again to switch between AM and
FM.
13. CD: Press this button to select the CD player.
14. Tape: Press this button to select the Cassette tape
player.
15. VCR1: Press this button to select a VCR or video source
connected to the rear panel on the unit.

8
Dolby Pro-LogicÒA/V Receiver JSR-400
16. VCR2: Press this button to select a VCR or video source
connected to the front panel on the unit.
17. AUX/TV Input: Press this button to select the source
connected to the TV Input.
18. Balance: This knob adjusts the balance between the
front left and right speakers.
19. Bass: This knob adjusts the tone of low-frequency
sounds. Turn it to the right to boost bass frequencies or to
the left to cut bass frequencies.
20. Treble: This knob adjusts the tone of high-frequency
sounds. Turn it to the right to boost high frequencies or to
the left to cut high frequencies.
21. Volume Control: Turn the knob clockwise to increase
volume, counterclockwise to decrease the volume.
22. Auto tune: Press this button when in the AM/FM mode
to direct the receiver to seek only the strongest stations
when pressing the TUNING button #23.
23. Tune: Press this button to manually scan up or down
through the FM or AM bands.
24. Information Display: This display delivers messages
and status indications to help you operate the receiver.
25. Remote Sensor Window: The sensor behind this
window receives infrared signals from the remote control.
Aim the remote at this area and do not block or cover it.

9
Dolby Pro-LogicÒA/V Receiver JSR-400
REAR PANEL CONNECTIONS
26. AM Antenna: Connect the AM loop antenna supplied
with the receiver to these terminals.
27. FM Antenna: Connect the FM antenna supplied with
the receiver to these terminals.
28. AUX In: Connect a TV output or any auxiliary audio
source (except for a phonograph) to these jacks. A
phonograph will need a phono pre-amp before being
connected to these jacks
29. CD IN: Connect these jacks to the output of a compact
disk player or CD changer.
30. Tape In: Connect these jacks to the PLAY/OUT jacks of
an audio recorder.
31. Tape Out: Connect these jacks to the RECORD/INPUT
jacks of an audio recorder.
32. VCR In: Connect these jacks to the audio output jacks of
a stereo VCR.
33. VCR Out: Connect these jacks to the audio input jacks
of a stereo VCR.
34. Video - VCR1: Connect the single input jack to the video
output jack of a VCR, and the output jack to the video input
jack of the same VCR.
35. TV Monitor Video Output: Connect this jack to the
standard (composite) video input of a TV monitor or video
projector to view the output of any standard video source
selected by the receiver’s video switch.
36. Subwoofer Pre-Out: Connect this jack to the line level
input of a powered subwoofer. If an external subwoofer
amplifier is used, connect this jack to the subwoofer
amplifier input.
37. Rear Speakers: Connect these terminals to the
surround speakers.
38. Main Speakers: Connect these terminals to the front
speakers.
39. Center: Connect these terminals to the center speaker.
40. Power Cable: Connect the AC plug to a non-switched
AC wall output.
WARNING : "TO REDUCE THE RISK OF FIRE OR
DO NOT EXPOSE THISAPPLIANCE TO
NE PAS EXPOSER CET APPPAREIL
AVERTISSEMENT : "AFIN D'EVITER LES DANGERS
A LA PLUIE NI A L'HUMIDITE".
D'INCENDIE ET D'ELECTROCUTION,
A172
E28241
Listed
(8W)
AUDIO
R
L
AUX
IN ININ
CD TAPE
OUT
75W
AM
LOOP
GND
BAL
300W
UNBAL
FM
ANTENNA
IN
VCR1
OUT
WOOFER
SUB
REAR SPEAKERS
R
(8W)
L
MAIN SPEAKERS
RL
(8W)
CENTER
SPEAKERS
R
180W
MONITOR
VIDEO
VCR1
IN OUT OUT
MODEL NO. : JSR-400
ELECTRIC SHOCK.
RAIN OR MOISTURE".
AVIS : RISQUE DE CHOC
ELECTRIQUE-NE PAS OUVRIR
CAUTION
DO NOT OPEN.
RISK OF ELECTRIC SHOCK
AC~120V 60Hz
!
Northridge,CA USA
A HAarman International Company
H
DOLBY PROLOGIC RECEIVER
Audio equipment
must accept any interference received, including interference that may cause undesired
Manufactured under license from Dolby Laboratories Licensing Copration."Dolby,"the
double-D symbol and "Pro Logic" are trademarks of Dolby Laborotories Liencing
two conditions; (1) The device may not cause harmful interferance, and (2) This device
This devices complies with Part 15 of the FCC rules. Operation is subject to the following
Coporation.
operation.
R
27 26 28 29 30 31 32 33 34 35 36 37 38 39 40

10
Dolby Pro-LogicÒA/V Receiver JSR-400
DISASSEMBLY PROCEDURES
JBL
JBL
JBL
JBL
STEP 1.
REMOVING THE TOP COVER
1. REMOVING THE SCREWS 1~9
STEP 2.
REMOVING THE BOTTOM COVER
1. REMOVING THE SCREWS 1~8
STEP 3.
REMOVING THE FRONT PANEL
1. REMOVING KNOB VOLUME MAIN FROM FRONT PANEL
2. REMOVING THE SCREWS 1~12
1
1
4
4
3
3
2
2
9
6
6
6
8
8
5
5
5
8
9
4
3
2
1
12
11 10
7
7
7
KNOB VOLUME MAIN

11
Dolby Pro-LogicÒA/V Receiver JSR-400
DISASSEMBLY PROCEDURES (continued)
D'INCENDIE ET D'ELECTROCUTION,
A LA PLUIE NI A L'HUMIDITE".
AVERTISSEMENT : "AFIN D'EVITER LES DANGERS
NE PAS EXPOSER CET APPPAREIL
DO NOT EXPOSE THISAPPLIANCE TO
WARNING : "TO REDUCE THE RISK OF FIRE OR
ANTENNA
ININ
R
L
AUX CD
!
DOLBY PROLOGIC RECEIVER
A HAarman International Company
Northridge,CA USA
MODEL NO. : JSR-400
OUTINOUTIN
AUDIO
WOOFER
SUB
OUT
VIDEO
TAPE
LOOP
AM
VCR1
IN
VCR1
FM
GND
75W
UNBAL
BAL
300W
MONITOR
OUT
H
REAR SPEAKERS (8W)
R L
SPEAKERS
CENTER
(8W)
MAIN SPEAKERS
R L
(8W)
Audio equipment
E28241
Listed
A172
R
RISK OF ELECTRIC SHOCK
DO NOT OPEN.
ELECTRIQUE-NE PAS OUVRIR
AVIS : RISQUE DE CHOC
RAIN OR MOISTURE".
ELECTRIC SHOCK.
CAUTION
This devices complies with Part 15 of the FCC rules. Operation is subject to the following
two conditions; (1) The device may not cause harmful interferance, and (2) This device
double-D symbol and "Pro Logic" are trademarks of Dolby Laborotories Liencing
Manufactured under license from Dolby Laboratories Licensing Copration."Dolby,"the
must accept any interference received, including interference that may cause undesired
Coporation.
operation.
180W
AC~120V 60Hz
STEP 4.
REMOVING THE FRONT CHASSIS
1. REMOVING THE SCREWS 1~5
STEP 5.
REMOVING THE REAR PANEL
1. REMOVING THE SCREWS 1~18
STEP 6.
REMOVING THE TUNER PCB
1. REMOVING THE SCREWS 1
6
5
589
4
4
3
3
2
2
1
1
1
12 13 14 15
16
17
18
11
10
7

12
Dolby Pro-LogicÒA/V Receiver JSR-400
DISASSEMBLY PROCEDURES (continued)
STEP 8.
REMOVING THE VIDEO PCB
1. REMOVING THE SCREWS 1~2
STEP 9.
REMOVING THE MAIN PCB
1. REMOVING THE SCREWS 1~3
STEP 7.
REMOVING THE POWER PCB
1. REMOVING THE SCREWS 1~4
1
3
3
1
1
4
2
2
2

13
Dolby Pro-LogicÒA/V Receiver JSR-400
CIRCUIT DESCRIPTION
1. Surround Circuits
This model incorporates a surround processor circuit.
Fig. 1 is a block diagram of the surround processor circuit. The microprocessor transfers the data to the Dolby Pro-Logic
decoder and Time Delay Device to operate the circuits in each mode.
1) BYPASS
Set to this mode to listen to ordinary stereo sound. The rear L/R and center outputs will be muted.
Input
Auto-
balance
Control
X1
X1
IC10
NJW1102
AMP
AMP
C
S
C
S
electric
vol.
Center/
Operating
Mode
Control
Adaptive
Matrix
By-Pass Line
L
R
C
S
S
S
V LR V CS
IC11
NJU9702
Time
Delay
7knz
LPF Modified
Dolby B NR
Noise
Generator
Noise
Sequencer
IC5
LC4966
Buffer
Buffer
L Input
R Input
MASTER
VOLUME
TONE
CONTROL
TONE
CONTROL
L
C
R
S
AMP
AMP
AMP
AMP
SPEAKER
FRONT L
CENTER
FRONT L
SURROUND L
SURROUND L
Fig. 1
Block diagram of the surround
processor circuit
SURROUND
SURROUND
IC5
OUTPUT
OUTPUT
SOURCE
SOURCE
L
R
LC4966
Fig. 2

14
Dolby Pro-LogicÒA/V Receiver JSR-400
2) DOLBY PRO-LOGIC CIRCUIT
Dolby Pro-Logic is a sound effect system for movies developed by the Dolby Laboratories Licensing Corp. IC10 (NJW1102) is
a Dolby Pro-Logic decoder IC. When an audio signal recorded using the Dolby Pro-Logic system is sent to this IC, the left,
right, center and surround components are separated. The surround signal component is delayed by the delay IC11
(NJU9702). Fig. 3 shows the configuration of the Dolby decoder.
With Dolby Pro-Logic, three center modes depend on the use of a center speaker as follows.
NORMAL: Bass frequencies are sent only to the Left and Right Front channels. Select this mode when the
Center Speaker is smaller than the left and Right speakers.
WIDE: Bass frequencies are sent to the Left, Center and Right speakers. Select this mode when the
Center speaker is approximately the same size as the Left and Right speakers.
PHANTOM: Center channel information is sent to the Left and Right speakers. Select this mode when you do
not have a center channel speaker.
3) STEREO CIRCUIT
In 3-stereo mode, surround sound is sent to front Left channel and front Right channel and no surround sound is sent to
surround channel.
L-ch
L-ch
R-ch
R-ch
C-ch
C-ch
Input
Auto-
balance
Control
X1
X1
Audio
Signal
Audio
Signal
IC10
AMP
AMP
C
S
C
S
electric
vol.
Center/
Operating
Mode
Control
Adaptive
Matrix
By-Pass Line
L
R
C
S
S
S
VLR VCS
IC11
NJU9702 Time
Delay
7knz
LPF Modified
Dolby B NR
Fig. 3 Flow of signals within the system
in the Dolby Pro-Logic mode
Adaptive
Matrix
Center/
Operating
Mode
Channel
L-ch
L-ch
R-ch
R-ch C-ch
L
R
C
Celectric
vol.
Input
Autobalance
Control
IC10 NJW1102
X1
X1
Audio
Signal
Audio
Signal
Fig. 4 Flow of signal within the system in the 3-stereo mode

15
Dolby Pro-LogicÒA/V Receiver JSR-400
4) TEST TONE GENERATOR
The test tone generator generates a test tone (noise) to check the balance of sound output from each speaker in the Dolby
Pro-Logic mode. (This circuit is produced under license of the Dolby Laboritories Licensing Corp.) The test tone to the
loudspeakers at 2 second intervals in the following sequence: Left, Center, Right, Rear (both rear channels).
2. DIGITAL TUNING SYSTEM DESCRIPTION.
1) DIGITAL TUNING SYSTEM
FM FRONT END PACK
FM ANT
AM ANT
FM RF
AM RF
FM MIX
AM MIX
FM OSC
AM OSC
BUFFER
BUFFER
FM PLL Loop
AM PLL Loop
Low Pass Filter
Q201, 202
FM IN
AM IN
IC2
PLL Prescaler
CPU
IC1
Data
FL
Display
Key
Switch
Matrix
Adaptive
Matrix
Noise
Sequencer
Input
Auto-
Balance
Control
S
IC11
NJU9702
Time
Delay
IC10 NJW1102
L
B
C
S
Center/
Operating
Mode
Channel
L-ch
R-ch
C-ch
S-ch
Noise signal output
Fig. 5 Flow of noise signals within the system

16
Dolby Pro-LogicÒA/V Receiver JSR-400
2) VCO VS. FM BAND FREQUENCY CURVE.
3) VCO VS. AM BAND FREQUENCY CURVE.
87.5 89.5 91.5 93.5 95.5 97.5 99.5 101.5103.5 105.5 107.5
V Voltage (V)
CO
8
7
6
5
4
3
2
1
0
FM Band Frequency (MHz)
520 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
V Voltage (V)
CO
9
8
7
6
5
4
3
2
1
0
AM Band Frequency (kHz)

17
Dolby Pro-LogicÒA/V Receiver JSR-400
JSR400 PACKING
6425-000-240
1111-ARCCINII
6231-001-011
6234-002-000
6453-000-002
2163-000-010
2163-000-020
6452-000-020
6457-000-010
6131-000-160
6132-000-060
6161-000-140
CORD PIN
ANT. FM
BAG PE
POLY SHEET
CUSHION SIDE
AM LOOP ANTENA
INSTRUCTION MANUAL
REMOCON ASS'Y
1
1
1
1
1
1
1
LABEL SERIAL NO
CARD WARRANTY
CORD RCA
BATTERY
1
1
2
1
NO.NO.
1
PARTS NO.
PARTS NAME
QT'Y
11
6
3
2
4
5
8
7
9
10
13
12
6121-000-421
MASTER CARTON
1
2
LABEL BARCODE #39
14 6234-001-021 1
13
1
23
3
45
12
10
11
9
67
ATTACHED WITH
CELLOPHANE TAPE
8
14

18
Dolby Pro-LogicÒA/V Receiver JSR-400
JSR400 BLOCK DIAGRAM
H
G
F
FGH
ED
C
BA
ABCDE
J
ILMKO
O
P
P
LMIJK
1
FM
AM
FM
FRONT END
AM
ANT
AM
OSC
PLL IC
LM7001
ANT
IC2
IC3
F101 F102
AM
IF T
F202
AM/FM IF
LA1265
DATA
CLK
CE
TUNED
STEREO
T-MUTE
L.P.F.
FM
DET
IC4
FM MPX
LA3410
CPU
- INPUT PARTS
- SURROUND PARTS
- TUNER PARTS
- MAIN AMP PARTS
- POWER SUPPLY PARTS
BUFFER
BY-PASS
MASTER VOLUME
TONE AMP
FL DISPLAY
RIGHT CHANNEL
(SAME AS LEFT CHANNEL)
BALANCE
MAIN AMP
14.5dB
KEY MATRIX
RESORNATOR
RMC
SENSOR
CPU
MAIN
POWER
TRANS
REGULATOR
+15V. -15V.
+5V
AMP
POWER
SUPPLY
FL AC 4V
+15V
-15V
+5V
FRONT AMP
CENTER AMP
REAR AMP
COMMANDER
5V
REGU.
ST-BY
TRANS
RELAY
DRIVER
EUROPE : 230/50Hz
USA : 120/60Hz
ST-BY RELAY
HEAD
PHONE
FRONT
SPEAKER
PROTECT
SUB WOOFER
PROTECT
PROTECT
CENTER
SPEAKER
L
REAR
SPEAKER
R
CENTER AMP
REAR AMP
MUTE
MUTE
MUTE
19.3dB
19.3dB
C-CH
S-CH
2.92dB
0.83dB
DOLBY PRO-LOGIC
ADAPTIVE MATRIX
NJW1102
DIGITAL
DELAY
NJU9702
VCR
VIDEO from CPU
LC4966
6dB AMP
6dB AMP
IC7821
AUDIO
TUNER
TV
I
O
I
O
I
VIDEO
CD
VIDEO
I
O
VCR
VIDEO IN
MONITOR
TAPE
VCR1
JSR-400 BLOCK DIAGRAM
JSR-400 PAGE 18-1of2 JSR-400 PAGE 18-2of2

H
G
F
FGH
ED
C
BA
ABCDE
I
I
1
FM
AM
FM
FRONT END
AM
ANT
AM
OSC
PLL IC
LM7001
ANT
IC2
IC3
F101 F102
AM
IF T
F202
AM/FM IF
LA1265
DATA
CLK
CE
TUNED
STEREO
T-MUTE
L.P.F.
FM
DET
IC4
FM MPX
LA3410
CPU
- INPUT PARTS
- SURROUND PARTS
- TUNER PARTS
- MAIN AMP PARTS
- POWER SUPPLY PARTS
BUFFER
BY-PASS
MASTER VOLUME
TONE AMP
FL DISPLAY
RIGH
T
(SAME AS
BALAN
C
14.5dB
R
E
FL
FRO
N
CENT
E
RE
A
MU
T
C-CH
S-CH
2.92dB
0.83dB
DOLBY PRO-LOGIC
ADAPTIVE MATRIX
NJW1102
DIGITAL
DELAY
NJU9702
VCR
VIDEO from CPU
LC4966
6dB AMP
6dB AMP
IC7821
AUDIO
TUNER
TV
I
O
I
O
I
VIDEO
CD
VIDEO
I
O
VCR
VIDEO IN
MONITOR
TAPE
VCR1
JSR-400 BLOCK DIAGRAM
JSR-400 PAGE 18-1of2

H
G
GH
J
ILMKO
O
P
P
LMIJK
P
U
- INPUT PARTS
- SURROUND PARTS
- TUNER PARTS
- MAIN AMP PARTS
- POWER SUPPLY PARTS
VOLUME
TONE AMP
FL DISPLAY
RIGHT CHANNEL
(SAME AS LEFT CHANNEL)
BALANCE
MAIN AMP
14.5dB
KEY MATRIX
RESORNATOR
RMC
SENSOR
CPU
MAIN
POWER
TRANS
REGULATOR
+15V. -15V.
+5V
AMP
POWER
SUPPLY
FL AC 4V
+15V
-15V
+5V
FRONT AMP
CENTER AMP
REAR AMP
COMMANDER
5V
REGU.
ST-BY
TRANS
RELAY
DRIVER
EUROPE : 230/50Hz
USA : 120/60Hz
ST-BY RELAY
HEAD
PHONE
FRONT
SPEAKER
PROTECT
SUB WOOFER
PROTECT
PROTECT
CENTER
SPEAKER
L
REAR
SPEAKER
R
CENTER AMP
REAR AMP
MUTE
MUTE
MUTE
19.3dB
19.3dB
C-CH
S-CH
2.92dB
0.83dB
Y
PRO-LOGIC
T
IVE MATRIX
J
W1102
DIGITAL
DELAY
N
JU9702
JSR-400 PAGE 18-2of2