TX-SR402/8240/HT-R420
SERVICE MANUAL
AV RECEIVER
MODEL
TX-SR402
TX-SR8240
HT-R420
Ref. No. 3796
032004
TX-SR402 Silver and Golden models
220-230V AC, 50/60Hz
SMGR,GMGR
HT-R420 Black and Silver models
120V AC, 60Hz
BMDC,BMDD,SMDC,SMDD
230-240V AC, 50Hz
BMPA,SMPA,SMPT
120V/220-230V AC, 50Hz
SMWT
TX-SR8240 Golden models
220-230V AC, 50/60Hz
GMGR
RC-518M
(Noth American model)
RC-479S
(Other models)
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK
ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.
TX-SR402/8240/HT-R420
SPECIFICATIONS-1
TX-SR402/TX-SR8240
Audio Outputs
Analog Outputs:
TAPE, VIDEO1
Subwoofer Pre Outputs:
1
Speaker Outputs:
5+2
Phones:
1
Specifications and features are subject to change without notice.
Power Supply:
AC 220-230 V, 50/60 Hz
Power Consumption:
300W
Dimensions:
435 W x 150 H x 374 D mm
17 1/8 W x 5 7/8 H x 14 3/4 D inches
Weight:
8.8 kg
18.4 lbs
Video Inputs
S-Video Compatible Jack Input:
DVD, VIDEO1, VIDEO2
A/V Input:
DVD, VIDEO1, VIDEO2, VIDEO3
Video Outputs
S-Video Compatible Jack Output: MONITOR, VIDEO1
A/V Output:
MONITOR, VIDEO1
Audio Inputs
Digital Inputs:
1 (Optical ) , 1 (Coaxial )
Analog Inputs:
DVD (MULTI CHANNEL), CD, TAPE,
VIDEO1, VIDEO2, VIDEO3
Multichannel Inputs:
6
General
Power Output:
All channels:
100 W (6 , 1kHz, JEITA)
Dynamic Power:
160 W + 160 W (3 , Front)
125 W + 125 W (4 , Front)
85 W + 85 W (8 , Front)
THD
(Total Harmonic Distortion):
0.08 % (Power Rated)
Damping Factor:
60 (Front, 1kHz, 8 )
Input Sensitivity and Impedance:
200 mV/ 47 k
(LINE)
Output Level and Impedance:
200 mV/ 470
(REC OUT)
Frequency Response:
10 Hz~100 kHz / +1 dB -3 dB (Direct
mode)
Tone Control:
+12 dB, -12 dB, 50 Hz (BASS)
+12 dB, -12 dB, 20k Hz (TREBLE)
SN Ratio:
100 dB (CD, IHF-A)
Speaker Impedance:
6-16
Amplifier Section
Input Sensitivity/Output Level and Impedance:
1 Vp-p /75 (Component and S-Video Y)
0.28 Vp-p /75 (Component Pb/Cb,Pr/Cr)
0.28 Vp-p /75 (S-Video C)
1 Vp-p /75 (Composite)
Video Section
FM
Tuning Frequency Range:
87.5 MHz~108.0 MHz
Usable Sensitivity:
Stereo 17.2 dBf 2 V (75 IHF)
Mono 11.2 dBf 1 V (75
IHF)
S/N Ratio:
Stereo 70 dB (IHF-A)
Mono 76 dB (IHF-A)
THD:
Stereo 0.3 % (1kHz)
Mono 0.2 % (1kHz)
Frequency Response:
30 Hz~15 kHz / +1 dB, -1 dB
Stereo Separation:
45 dB ( 1kHz )
AM
Tuning Frequency Range:
522-1611 kHz
Usable Sensitivity:
30 V
S/N Ratio:
40 dB
THD:
0.70%
Tuner Section
TX-SR402/8240/HT-R420
SPECIFICATIONS-2
HT-R420
Audio Outputs
Analog Outputs:
TAPE, VIDEO1
Subwoofer Pre Outputs:
1
Speaker Outputs:
5+2
Phones:
1
Specifications and features are subject to change without notice.
Power Supply:
American model: AC 120 V, 60 Hz
Australian model: AC 230 V, 50 Hz
Others model: AC 120-220/230 V, 50/60 Hz
Power Consumption:
American model: 4.7A
Australian and Worldwide model: 300 W
Dimensions:
435 W x 150 H x 374 D mm
17 1/8 W x 5 7/8 H x 14 3/4 D inches
Weight:
8.8 kg
19.4 lbs
Video Outputs
S-Video Compatible Jack Output: MONITOR, VIDEO1
A/V Output:
MONITOR, VIDEO1
Video Inputs
S-Video Compatible Jack Input:
DVD, VIDEO1, VIDEO2
A/V Input:
DVD, VIDEO1, VIDEO2, VIDEO3
Audio Inputs
Digital Inputs:
1 (Optical ) , 1 (Coaxial )
Analog Inputs:
DVD (MULTI CHANNEL), CD, TAPE,
VIDEO1, VIDEO2, VIDEO3
Multichannel Inputs:
6
General
Power Output:
All channels:
100 W (8 , 20Hz~20kHz, FTC)
American model
100 W (8 , 1kHz, DIN) Australian model
100 W (6 , 1kHz, JEITA) Asian model
Dynamic Power:
230 W + 230 W (3 , Front)
170 W + 170 W (4 , Front)
115 W + 115 W (8 , Front)
THD
(Total Harmonic Distortion):
0.08 % (Power Rated)
Damping Factor:
60 (Front, 1kHz, 8 )
Input Sensitivity and Impedance:
200 mV/ 47 k
(LINE)
Output Level and Impedance:
200 mV/ 470
(REC OUT)
Frequency Response:
10 Hz~100 kHz / +1 dB -3 dB (Direct
mode)
Tone Control:
+12 dB, -12 dB, 50 Hz (BASS)
+12 dB, -12 dB, 20k Hz (TREBLE)
SN Ratio:
100 dB (CD, IHF-A)
Speaker Impedance:
8~16
Amplifier Section
Input Sensitivity/Output Level and Impedance:
1 Vp-p /75 (Component and S-Video Y)
0.28 Vp-p /75 (Component Pb/Cb,Pr/Cr)
0.28 Vp-p /75 (S-Video C)
1 Vp-p /75 (Composite)
Video Section
FM
Tuning Frequency Range:
87.5 MHz~108.0 MHz
Usable Sensitivity:
Stereo 17.2 dBf 2 V (75 IHF)
Mono 11.2 dBf 1 V (75
IHF)
S/N Ratio:
Stereo 70 dB (IHF-A)
Mono 76 dB (IHF-A)
THD:
Stereo 0.3 % (1kHz)
Mono 0.2 % (1kHz)
Frequency Response:
30 Hz~15 kHz / +1 dB, -1 dB
Stereo Separation:
45 dB ( 1kHz )
AM
Tuning Frequency Range:
American model: 530 kHz~1710 kHz
Australian model: 522 kHz~1611 kHz
Others model: 530/522 kHz~1710/1611 kHz
Usable Sensitivity:
30 V
S/N Ratio:
40 dB
THD:
0.70%
Tuner Section
TX-SR402/8240/HT-R420
SERVICE PROCEDURES-1
120V
VOLTAGE SELECTOR
220-230V
120V
VOLTAGE
SELECTOR
220-230V
SWITCHED
100W MAX.
AC OUTLET
1. Replacing the fuses
2. Safety-check out
(Only U.S.A. model)
After correcting the original service problem perform the
following safety check before releasing the set to the customer
Connect the insulating-resistance tester between the plug of
power supply cord and terminal GND on the back panel.
Specifications: More than 10Mohm at 500V
This symbol located near the fuse indicates that the
fuse used is show operating type, For continued protection against
fire hazard, replace with same type fuse, For fuse rating, refer to
the marking adjacent to the symbol.
Ce symbole indique que le fusible utilise est e lent.
Pour une protection permanente, n'utiliser que des fusibles de meme
type. Ce demier est indique la qu le present symbol est apposre.
3. To initialize the unit
This unit does not require memory preservation batteries.
A built-in memory power backup system preserves the contents of
memory during power failures and even when the power cord is unplugged.
The power cord must be plugged in order to charge the backup system.
The memory preservation period after the unit has been turned off varies
depending on climate and placement of the unit. On average, memory
contents are protected over a period of a few weeks after the time the unit
has been turned off.
This period is shorter when the unit is exposed to a very humid climate.
[NOTE]
<DD> : 120V model only
<DC> : 120V model only
<WT> : World wide model only
<GR> : Chinese model only for 220V
<PA> : Australia model only for230V
<PT> : Asian model only for 230V
This device employs a microprocessor to perform various
functions and operations. If interference generated by an external
power supply, radio wave, or other electrical sauce results in accident
which causes the specified operations and functions to operate
abnormally.
To perform a result, please follow the procedure below.
1. Press and the hold down the VIDEO 1 button , then press the
STANDBY/ON button when the unit is Power ON.
2. After "Clear " is displayed, the preset memory and each mode
stored in the memory, are initialized and will return to the
factory settings.
5. Memory Preservation
6.Setting the voltage selector
(Worldwide models only)
The Worldwide model has a voltage selector for compatibility with
power systems around the world. Before you plug in this model,
make sure that the voltage selector is set to the correct voltage for
your area. If it isn't, use a small screwdriver to set it as appropriate.
For example, if the voltage in your area is 120 volts (V), set the
selector to "120V. " And if it's between 220 and 230 volts (V), set it
to "220-230V."
REF NO.
PART NO. DESCRIPTION
NOTES
F6901,F6902
F6901,F6902
F6901or,F6902or
F901
F901 or
F902
F902 or
F902 or
F903
F903 or
F903 or
F903
F903 or
252099
252198
252261
252198
252261
252076
252242
252276
252075
252241
252275
252164
252258
8A-EAK
FUSE
8A-UL
8A-T/UL-ST2
8A-UL
8A-T/UL-ST2
3.15A-SE-EAK FUSE
3.15A-SE-TL250V
3.15A-SE-TL250V
2.5A-SE-EAK FUSE
2.5A-SE-TL250V
2.5A-SE-TL250V
5A-UL/T-237
5A-T/UL-ST2
GR,WT,PA,PT
DC,DD
DC,DD
DC,WT,DD
DC,WT,DD
GR,WT,PA,PT
GR,WT,PA,PT
GR,WT,PA,PT
GR,WT,PA,PT
GR,WT,PA,PT
GR,WT,PA,PT
DC,DD
DC,DD
Main microprocessor Q7008.
1. Press and the hold down the DISPLAY button , then press the
STANDBY/ON button when the unit is Power ON.
Version is displayed on FL display only for 3 seconds.
2. Press the STANDBY/ON button to Power Off.
Sub microprocessor Q7502.
Check is impossible. (Unnecessary)
4. How to check version of microprocessor?
Version 30212a
ex.
TX-SR402/8240/HT-R420
SERVICE PROCEDURES-2
NCDG-7401
25137401C
7002
C7003
D7001
D7002
R7001 R7002
R7003
R7004
R7011
R7012
R7015
R7016
R7017
R7018
R7019
R7020
R7120
Q7008
1
Microprocessor
1. Worldwide model (MWT).
You can select AM band step 9kHz or 10kHz by the following
operation.
How to select?
Press and hold down the TUNER , then press the MEMORY.
2. Except worldwide model.
2-1. Necessary to change as follows.
R7003
Change to 10 kohms. (Refer to Fig-1)
R7004
Change to 10 kohms. (Refer to Fig-1)
2-2. How to select?
Press and hold down the TUNER , then press the MEMORY.
Fig-1
NADG-7401 (PREAMPLIFIER PC BOARD)
7. Changing the AM band step
component side