ONKYO TX-SR302 Service Manual

Cover page of ONKYO TX-SR302 Service Manual

Service Manual for ONKYO TX-SR302, downloadable as a PDF file.

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TX-SR302
SERVICE MANUAL
SERVICE MANUAL
AV RECEIVER
Silver model
MODEL
TX-SR302
120V AC, 60Hz
MDD, UDD
Ref. No. 3844
112004
RC-479S
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.
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TX-SR302
SERVICE MANUAL
SERVICE MANUAL
AV RECEIVER
Silver model
MODEL
TX-SR302
120V AC, 60Hz
MDD, UDD
Ref. No. 3844
112004
RC-479S
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.
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TX-SR302
SPECIFICATION
Amplifier Section
General
Video Section
Tuner Section
Specifications and features are subject to change without notice.
AM
Tuning Frequency Range:
530 kHz~1710 kHz
Usable Sensitivity:
30 V
S/N Ratio:
40 dB
THD:
0.70 %
Audio Outputs
Analog Outputs:
TAPE, VIDEO 1
Subwoofer Pre Outputs:
1
Speaker Outputs:
5 + 2
Phones:
1
Audio Inputs
Digital Inputs:
1 (Optical), 1 (Coaxial)
Analog Inputs:
DVD (MULTICHANNEL), CD, TAPE,
VIDEO 1, VIDEO 2, VIDEO 3
Multichannel Inputs:
6
Video Outputs
A/V Output:
MONITOR, VIDEO 1
Video Inputs
A/V Input:
DVD, VIDEO 1, VIDEO 2, VIDEO 3
Power Output
Front L/R:
65 W + 65 W
Center:
65 W
Surround L/R:
65 W + 65 W
(8
, 20 Hz~20 kHz, FTC)
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, 1 kHz, 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, 20 kHz (TREBLE)
SN Ratio:
100 dB (LINE, IHF-A)
Speaker Impedance:
8
~16
Power Supply:
AC 120 V, 60 Hz
Power Consumption:
4.2 A
Stand-by Power Consumption:
1.6 W
Dimensions (W x H x D):
435 x 150 x 365 x mm
17 1/8 x 5 7/8 x 14 3/8 inches
Weight:
8.4 kg
18.5 lbs
Input Sensitivity/Output Level and Impedance:
1 Vp-p /75
(Composite)
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 % (1 kHz)
Mono
0.2 % (1 kHz)
Frequency Response :
30 Hz~ 15 kHz / +1 dB, -1 dB
Stereo Separation:
45 dB (1 kHz )
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SERVICE PROCEDURES
TX-SR302
1. Replacing the fuses
2. Safety-check out
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.
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
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.
4. How to check version of microprocessor?
Version 04212a
ex.
REF. NO.
F6901
F6901 or
F6902
F6902 or
F901
F901 or
F903
F903 or
DESCRIPTION
8A-UL
8A-T/UL-ST2
8A-UL
8A-T/UL-ST2
6.3A-UL/T-237
6.3A-T/UL-ST2
5A-UL/T-237
5A-T/UL-ST2
PART NO.
252198
252261
252198
252261
252166
252260
252164
252258
REMARKS
!
!
!
!
!
!
!
!
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OPERATION CHECK-1
DC VOLTAGE DETECTION PROTECTORS
CURRENT DETECTION PROTECTORS
TX-SR302
Test - _
Test - 1-00
FL display
Clear
Disappears
0.5 sec.
FL display
Test - _
Test - 4-00
Test - 4-29
Clear
Disappears
1. Set the unit to test mode " Test-1-00 " .
1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
1-2. Press the DVD button, while the " Test - _ " is shown.
Unit will be in the state of " Test-1-00 ".
2. Apply DC voltage (+1.5 to +3V) to MULTI CHANNEL (FL, FR, SL, SR, C) terminal, each channel.
3. Check that " Protect " is shown.
4. Apply DC voltage (-1.5 to -3V) to MULTI CHANNEL (FL, FR, SL, SR, C) terminal, each channel.
5. Check that " Protect " is shown.
6. Press the STANDBY/ON button.
[NOTE1]
Limit time to apply voltage is 0.5 to 1.0 seconds each channel.
When protection operation does not occur at once, try several times.
[NOTE2]
Don't connect speakers or any load.
Don't short speaker terminals.
[NOTE]
In the state of test mode" Test-4-29 ", the pulse waveform output for checking from speaker terminal automatically.
Therefore, oscillator is unnecessary.
1. Set the unit to test mode " Test-4-29 "
1-1. Press and the hold down the CD button , then press the STANDBY/ON button when the unit is Power ON.
1-2. Press the VIDEO 3 button, while the" Test - _ " is shown.
Unit will be in the state of " Test-4-00 ".
1-3. Repeat and press SPEAKERS B button to the " Test-4-29 " is shown.
2. Connect the lord resister (3 ohms) to the speaker terminals.
3. Check that the" Protect " is not shown, and speaker relays not turn OFF.
4. Check the each speaker terminals.
5. Connect the lord resister (1.5 ohms) to the speaker terminals.
6. Check that the " Protect " is shown, and speaker relays turn OFF immediately.
7. Check the each speaker terminals.
8. Press the STANDBY/ON button.
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OPERATION CHECK-2
OUTPUT LEVEL & THERMAL DETECTION
TX-SR302
RL6901
D6904
D6903
RL6902
POWER AMP.
PRI.
SEC1
Low
High
+B1
-B1
T901 MAIN
TRANSFORMER
Low
High
Q6303
THERMAL
SENSOR
R6380
THERMAL
DETECTION
OUTPUT
LEVEL
DETECTION
VOLH/
THPRO
Q7008
MAIN
MICROPROCESSOR
Q6303
SEC1H
23
2
SPEAKER
OUT
F6901
F6902
Low-voltage
HIGH
VOLTAGE
MODE
LOW
VOLTAGE
MODE
+/- 49 V
+/- 28.9 V
High-voltage
Regarding the power supply system of this unit.
<Function>
1. High-voltage mode
Usually, the power supply supplies high voltage to the power amplifier circuit when the relay (RL6901) is turned On.
2. Low-voltage mode
When as follows, a power supply changes to the state of supplying low voltage when the relay (RL6901) in turned Off.
(1) Excessive output signal is continuously outputted from power amplifier.
(2) Temperature of a heat sink over 80 degrees.
<Purpose>
1. The loss which power amplifier generates is decreased. As a result, the miniaturization of a heat sink is realized.
2. Corresponds to a safety standard.
<Necessity for a check of operation>
May not notice the fuse (F6901, F6902) broken in the case of repair.
Because the power supply is continuing supplying voltage from the High side of SEC1 at high-voltage mode.
When a power supply circuit changes to low voltage mode, amplifier does not operate.
Therefore, it is very important to check operation of this power supply system containing a fuse.
<Procedure>
[NOTE]
Don't connect speakers or any load.
Don't short speaker terminals.
(1) Set the unit is Multi channel input state.
(2) Set the master volume into the minimum.
(3) Apply sine wave signal to MULTI CHANNEL INPUT (FL+FR+C+SL) terminals.
(4) Connect an oscilloscope to speaker terminal of FL channel.
(5) Adjust master volume so that a speaker output may become distortion about 5%.
(6) Check that the RL6901 and RL6902 are turned Off after about 5 seconds progress.
And the power supply changes to low-voltage mode.
(7) Adjust the master volume so that output voltage may become half.
(8) Check that the RL6901 and RL6902 are turned On after 2 to 3 minutes.
And the power supply returns to high-voltage mode.
<Block diagram>

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