Sony ICF-CD2000 / ICF-CD2000S Service Manual ▷ View online
– 17 –
– LCD Board (Conductor side) –
TP
(DET OUT)
TP9
TP
(GND)
– MAIN Board (Conductor side) –
TP444
(GND)
(GND)
TP418
(AFC)
TP429
TP419
(REG)
– 18 –
CD SECTION
Precautions for Adjustment
1. Before beginning adjustment, set the equipment to service
mode.
After the completion of adjustment, be sure to reset the ser-
vice mode.
For more information, see “Service Mode (service program) ”
on page 10.
After the completion of adjustment, be sure to reset the ser-
vice mode.
For more information, see “Service Mode (service program) ”
on page 10.
2. Perform adjustments in the order given.
3. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
3. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
4. Power supply voltage requirement: DC6 V in battery terminal
VOLUME knob
: Minimum
MEGA BASS switch : OFF
Before Beginning Adjustment
Set the equipment to service mode (See page 11) and check the
following. If there is an error, repair the equipment.
following. If there is an error, repair the equipment.
• Checking of the sled motor
1. Open the upper panel.
2. Press the
2. Press the
>
and
.
keys and check that the optical pick-
up can move smoothly without sluggishness or abnormal noise
in innermost periphery
in innermost periphery
→
outermost periphery
→
innermost
periphery
>
: The optical pick-up moves outwardly.
.
: The optical pick-up moves inwardly.
• Checking of focus searching
1. Open the upper panel.
2. Press the
2. Press the
[CD ]
key. (Focus searching operation is activated
continuously)
3. Check the object lens of the optical pick-up for smooth up/
down motion without sluggishness or abnormal noise.
VCC Check
Use a SUM-3 battery for VCC check
Check Procedure:
1. Set the equipment to service mode stop state. (See page 11)
2. Connect the digital voltmeter to each test point on the MAIN
2. Connect the digital voltmeter to each test point on the MAIN
board as follows.
3. Confirm that the reading on digital voltmeter satisfy specified
value of each test point.
Test point
Specified value
+3 V
3.2 V
+3.4 V
3.2 V
DV
4.5 V
MDV
2.6 V
OPDV
1.75 V
POWER +B
3.8 V
PRE +B
3.8 V
PRE VC
1.6 V
4. After the completion of adjustment, reset service mode. (See
page 11)
Check Location: MAIN Board (See page 20)
digital voltmeter
(DC range)
MAIN board
Each TP
(See page 20)
+
–
–
Tracking Balance Check
Condition:
• Hold the set in horizontal state.
• Hold the set in horizontal state.
Check Procedure:
+
–
–
oscilloscope (DC range)
MAIN board
TP (TE)
TP (VC)
(See page 14)
1. Put the disc (YEDS-18).
2. Connect the oscilloscope to TP (TE) and TP (VC) on the MAIN
2. Connect the oscilloscope to TP (TE) and TP (VC) on the MAIN
board.
3. Set the equipment to service mode stop state. (See page 11)
4. Confirm that the waveform on the oscilloscope becomes up/
4. Confirm that the waveform on the oscilloscope becomes up/
down symmetrical with an axis of 0 V.
5. After the completion of adjustment, reset service mode. (See
page 11)
Check Location: MAIN Board (See page 20)
A
B
0 V
A
B
0 V
0.7 – 1.7 Vp-p
A=B
A=B
Note: Take long sweep time
for easy monitoring.
u
– 19 –
Focus bias Check
Condition:
• Hold the set in horizontal state.
• Hold the set in horizontal state.
Check Procedure:
1. Put the disc. (YEDS-18)
2. Set the equipment to service mode stop state. (See page 11)
3. Connect the oscilloscope to the test point TP (RF) on the MAIN
2. Set the equipment to service mode stop state. (See page 11)
3. Connect the oscilloscope to the test point TP (RF) on the MAIN
board.
4. Move the optical pick-up to the center by pressing the >
and . keys.
5. Press the
[BAND]
key. (Both tracking and sled are turned ON)
6. Check the oscilloscope waveform is as shown below.
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)
VOLT/DIV : 200 mV (With the 10:1 probe in use)
TIME/DIV : 500 ns
TIME/DIV : 500 ns
To watch the eye pattern, set the oscilloscope to AC range and
increase the vertical sensitivity of the oscilloscope for easy watch-
ing.
increase the vertical sensitivity of the oscilloscope for easy watch-
ing.
7. Stop revolving of the disc motor by pressing the
[ OFF ALARM RESET]
key.
8. After the completion of adjustment, reset service mode. (See
page 11)
Check Location: MAIN Board (See page 20)
RF level
0.9 to 1.3 Vp-p
0.9 to 1.3 Vp-p
oscilloscope
(AC range)
+
–
–
MAIN board
TP (RF)
TP (VC)
TP (VC)
(See page 14)
x
– 20 –
Check Location:
– MAIN Board (Conductor Side) –
TP
(DV)
TP
(MDV)
TP
(OPDV)
TP
(+3V)
TP
(+3.4V)
TP
(TE)
TP
(VC)
TP
(RF)
TP
(GND)
TP
(POWER +B)
TP
(PRE VC)
TP
(PRE +B)
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