Onkyo TX-SR502E Service Manual page 4

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SERVICE PROCEDURES-1
1. Replacing the fuses
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.
REF NO. PART NO. DESCRIPTION
F6901, F6902 252199
F6901, F6902 252100
F6901 or, F6902 or 252307
F901 252166
F901 or 252260
F902 252076
F902 or 252242
F902 or 252276
F903 252164
F903 or 252258
F903 252075
F903 or 252241
F903 or 252275
[NOTE]
<DD> : USA model only
<DC> : Canadian model only
<WT> : World wide model only
<GK> : Korean model only for 220V
<GR> : Chinese model only for 220V
<PP> : European model only for 230V
<PA> : Australian model only for230V
TE
L 13942296513
<PT> : Asian model only for 230V
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
3. To initialize the unit
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 "C le a r " is displayed, the preset memory and each mode
stored in the memory, are initialized and will return to the
factory settings.
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NOTES
10A-UL DC, DD
10A-EAK FUSE GK, GQ, GR, PA, PP, PT, WT
10A-TL250V GK, GQ, GR, PA, PP, PT, WT
6.3A-UL/T-237 DC, DD, GR, WT
6.3A-T/UL-ST2 DC, DD, GR, WT
3.15A-SE-EAK FUSE GK, GQ, GR, PA, PP, PT, WT
3.15A-SE-TL250V GK, GQ, GR, PA, PP, PT, WT
3.15A-SE-TL250V GK, GQ, GR, PA, PP, PT, WT
5A-UL/T-237 DC, DD
5A-T/UL-ST2 DC, DD
2.5A-SE-EAK FUSE GK, GQ, GR, PA, PP, PT, WT
2.5A-SE-TL250V GK, GQ, GR, PA, PP, PT, WT
2.5A-SE-TL250V GK, GQ, GR, PA, PP, PT, WT
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4. How to check version of microprocessor?
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.
ex.
Version 04215A
2. Press the STANDBY/ON button to Power Off.
Sub microprocessor Q7502.
Check is impossible. (Unnecessary)
5. Memory backup
The TX-SR502/TX-SR502E uses a battery-less memory
backup system in order to retain radio presets and
other settings when it's unplugged or in the case of a
power failure. Although no batteries are required, the
TX-SR502/TX-SR502E must be plugged into an AC
outlet in order to charge the backup system.
(On non-American models, the TX-SR502/
TX-SR502E's POWER switch must be set to ON in
order to charge the backup system.) Once it has been
charged, the TX-SR502/TX-SR502E will retain the settings
for several weeks, although this depends on the
environment and will be shorter in humid climates.
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
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the voltage selector is set to the correct voltage for your area. If it isn't,
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use a small screwdriver to set it as appropriate. For example, if the voltage
in your area is 120 volts, set the selector to "120V. " If it's between
220 and 230 volts, set it to "220-230V. "
COMPONENT VIDEO ANTENNA
VIDEO 1 / 2 / 3IN DVD IN OUT FM
AM 75
Y
P B
VIDEO 2 VIDEO 1 DVD
P
R
IN OUT IN
REMOTE
DIGITAL IN CONTROL
OPTICAL COAXIAL
3 2 1
IN OUT IN IN OUT IN FRONT
L
L
SUBWOOFER
PRE OUT
R
R
CD TAPE VIDEO 2 VIDEO 1
co
.
TX-SR502/E/8250/HT-R520
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Class 2 Wiring
AC OUTLET
FRONT FRONT SURROUND CENTER SWITCHED
SPEAKERS B SPEAKERS A SPEAKERS SPEAKER 100W MAX.
L L L
VOLTAGE
MONITOR
OUT
IN
SELECTOR R R R
VIDEO
VOLTAGE
S VIDEO SELECTOR
120 V
120 V SURROUND BACK
SURR CENTER SPEAKER
L
220-230 V
AV RECEIVER
TX-SR 502
MODEL NO.
R
SUB
WOOFER
DVD
220-230 V
m
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