Read Sony CMT-NE5 / HCD-NE5 Service Manual online
11
HCD-NE5
COLD RESET
*
The cold reset clears all data including preset data stored in
the RAM to initial conditions. Execute this mode when re-
turning the set to the customer.
the RAM to initial conditions. Execute this mode when re-
turning the set to the customer.
Procedure:
1. Press the
1. Press the
I/1
button to turn the power on.
2. While pressing the
x
button, press the
I/1
button and turn
the
[VOLUME]
knob in the counter-clock wise.
3. The message “RESET” is displayed and the set is reset.
PANEL TEST
*
All segments of liquid crystal display are tested, and the ver-
sion and released date of the micro computer are displayed.
sion and released date of the micro computer are displayed.
Procedure:
1. Press the
1. Press the
I/1
button to turn the power on.
2. While pressing the
[DISPLAY]
button, press the
I/1
button
and turn the
[VOLUME]
knob in the counter-clock wise.
Then all segments of liquid crystal display are turned on.
3. Press the
[DSGX]
button, the version and released date of the
micro computer are displayed.
example of display:
example of display:
0116 V202
4. Press the
[BASS/TREBLE]
button, the model name and
distination are displayed.
example of display:
example of display:
NE5 NA
5. To exit from this mode, perform the “COLD RESET”.
TUNER STEP CHANGE-OVER
*
Either the 9 kHz step or 10 kHz step can be selected for the
AM channel step.
AM channel step.
Procedure:
1. Set the FUNCTION to AM, and press the
1. Set the FUNCTION to AM, and press the
I/1
button to turn
the power off.
2. While depressing the
[TUNING + ]
button, press the
I/1
button.
3. The message “9K STEP” or “10K STEP” is displayed on the
liquid crystal display, and thus the channel step is changed
over.
over.
SECTION 4
TEST MODE
M >
Version of micro computer
(In this case, version 202)
(In this case, version 202)
released date of micro computer
(In this case, released of January 16)
(In this case, released of January 16)
SECTION 5
ELECTRICAL CHECK
+
–
–
CD board
TP (RFACO)
TP (VC)
TP (VC)
oscilloscope
(DC range)
Note:
1.
CD Block is basically constructed to operate without
adjustment.
adjustment.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
when the signal level is low than specified value with the
following checks.
5.
Check the focus bias check when optical block is replaced.
FOCUS BIAS CHECK
Procedure :
1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the
1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the
CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the
3. Press the
[CD ]
button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊
) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Checking Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
1.1
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
0.2 Vp-p
TP
(RFACO)
TP (VC)
– CD BOARD (Conductor Side) –
NX
distination
(In this case, North-American model)
(In this case, North-American model)
model name
(In this case, HCD-NE5)
(In this case, HCD-NE5)
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