Electrical Check - Sony HCD-FX300i US Service Manual

CD FACTORY MODE
Note 1: Do not enter the this mode while any other test mode is in prog-
ress.
Note 2: Do not enter any other test mode while the this mode is in prog-
ress.
Procedure:
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1. Press the [ ] button to turn the power on.
2. Press the [FUNCTION] button to select CD function
3. Press three buttons of [DSGX], [
ously.
4. It enters the CD factory mode and the message "FACTORY" is
displayed. When the [DSGX] button is pressed four times, the
following message (initial display) is displayed.
– –X 1ON
S curve mode setting
Tracking servo setting
RF gain setting
Key Operation:
[DSGX]:
The display changes in the following order when-
ever the button is pressed.
(Initial display)
FCSAG ( : Focus AGC value)
TRKAG ( : Track AGC value)
RF_AG ( : RF AGC value)
[ENTER]:
RF gain setting changes whenever the button is
pressed.
"– –": No gain fi xation.
"AL": Fix to the gain for AL disc.
"RW": Fix to the gain for RW disc.
[ +]:
Tracking servo setting changes whenever the but-
ton is pressed.
"ON": Tracking servo ON.
"OFF": Tracking servo OFF.
[FUNCTION]:
S curve mode setting changes whenever the button
is pressed.
" ": S curve mode OFF.
"S": S curve mode ON.
5. To release from this mode, press three buttons of [DSGX],
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[ –] and [ ] simultaneously.
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–] and [ ] simultane-
SECTION 4

ELECTRICAL CHECK

CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
ed.
3. Use an oscilloscope with more than 10 M: impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specifi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
oscilloscope
(DC range)
BD73/BD73U board
CL102 (RFOUT) +
CL117 (VREF) –
Procedure:
1. Connect the oscilloscope to CL102 (RFOUT) and CL117
(VREF) on the BD73/BD73U board.
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2. Press the [ ] button to turn the power on, and press the
[FUNCTION] button to select CD function.
3. Set disc (YEDS-18) and press the [u] button to playback.
4. Confi rm that oscilloscope waveform is as shown in the fi gure
below (eye pattern).
A good eye pattern means that the diamond shape (¡) in the
center of the waveform can be clearly distinguished.
Checking Location:
– BD73 Board (Conductor Side) –
– BD73U Board (Conductor Side) –
CL117
(VREF)
CL102
(RFOUT)
IC101
HCD-FX300i
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.1 ± 0.4 Vp-p
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