Onkyo CR-305TX Service Manual page 20

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SERVICE PROCEDURES-2
SERVICE PROCEDURES
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 adjest 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.
F901 252157
252083
2. To initialize the unit
1. Press and hold the MEMORY button and press the DISPLAY button.
All segments light up.
2. Press the STANDBY/ON button.
When " CLEAR " appears on the display, the preset memory and each mode stored in the memory are initialized
and will return to the factory setting.
3. Safety-check out
(Only U.S.A. model)
After correcting the original service problem perform the follwing safety check before releasing the set to the customer
TE
L 13942296513
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
4. Memory Preservation
This unit does not require memory preservation batteries. A built-in memory power back-up system preserves the contents of
the memory during power failures and even when the unit is un-plugged.
The unit must be plugged in order to charge the back-up system.
The memory preservation period after the unit has been unplugged varies depending on climate and placement of the unit.
On the average, memory contents are protected over a period of a few weeks after the last time the unit has been unplugged.
This period is shorter when the unit is exposed to a highly humid cli-mate.
5. Changing the AM band step
With the exception of the worldwide models, a tuning step selector switch is not provided.
When you change the band step, change the parts as shown below.
R705
R706
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DESCRIPTION
1.25A-UL/T-237, Fuse <DD, DT>
0.4A-SE-EAW, FUSE <PP,GR, GT>
To 10kHz To 9kHz
3.3k 10k
5.6k open
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NOTE : <DD, DT>
<PP,GR, GT> : 230 V model only
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2 9 9 4 2 8
: 120 V model only
1 5 0 5 8 2 9 9 4
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CR-305TX
9 9
2 8 9 9