Sony ICF-CD825RM Service Manual ▷ View online
– 13 –
[MAIN Board] (Conductor Side)
IC502
IC501
TP (RF)
TP
(VREF)
TP
(FE)
IC401
TP (TEST)
TP
(GND)
[MAIN Board] (Component Side)
RV502
Focus Gain Adjustment
Focus Gain Adjustment
RV501
Focus Bias Adjustment
Focus Bias Adjustment
Adjustment Location:
– 14 –
REMOTE CONTROL SECTION
Test Mode of Remote Commander (RM-RW1)
The Test mode is used for board adjustment. In the Test mode, the
output of IC701 4 pin on the TX board varies.
output of IC701 4 pin on the TX board varies.
Test Mode Setting Method:
1. Solder-bridge the TP-1 on the TX board (short IC701 2 pin
1. Solder-bridge the TP-1 on the TX board (short IC701 2 pin
and 3 pin).
2. Apply the power (DC 3 V) to the set.
3. Short instantaneously the IC701 0 pin (RESET) on TX board
3. Short instantaneously the IC701 0 pin (RESET) on TX board
to the ground, so that the Test mode becomes active.
4. In the Test mode, the operation is as follows:
• Snooze data are sent successively, when
[SNOOZE/SLEEP OFF]
button (S704) is pressed.
• Low (0 V) power is output, when
[CD ]
button (S701) is
pressed.
• High (3 V) power is output, when
[RADIO/SLEEP]
button
(S702) is pressed.
• Low (0 V) is output or data transmission is stopped, when
[OFF/ALARM RESET]
button (S703) is pressed.
Test Mode Releasing Method:
1. Turn the power OFF, then remove the solder bridge on TP-1
1. Turn the power OFF, then remove the solder bridge on TP-1
which was made in step 1 of Test Mode Setting Method.
2. Thus, the set can operate as usual.
Connecting points:
^
Output Level Max. Adjustment
Connection:
Adjustment Method:
1. Set the Test mode.
2. Press the
1. Set the Test mode.
2. Press the
[RADIO/SLEEP]
button (S702).
3. Adjust L703 so that the output level becomes maximum.
4. Adjust L704 so that the output level becomes maximum.
5. Adjust L708 so that the output level becomes maximum.
6. Repeat steps 3-5.
4. Adjust L704 so that the output level becomes maximum.
5. Adjust L708 so that the output level becomes maximum.
6. Repeat steps 3-5.
Adjustment Location: TX Board (See page 16)
Antenna Peak Adjustment
Connection:
Adjustment Method:
1. Set the Test mode.
2. Press the
1. Set the Test mode.
2. Press the
[RADIO/SLEEP]
button (S702).
3. Adjust CT701 so that the output level becomes maximum.
Adjustment Location: TX Board (See page 16)
Power Source
(DC 3 V)
+3 V
+
–
–
GND
RESET
IC701
TP-1
TP-2
TP-3
[TX Board] (Conductor Side)
+
–
–
Spectrum analyzer or
modulation analyzer
Input impedance 50
modulation analyzer
Input impedance 50
Ω
TX Antenna terminal
TX Board
(RM-RW 1)
+
–
–
Spectrum analyzer or
modulation analyzer
Input impedance 50
modulation analyzer
Input impedance 50
Ω
TX Antenna terminal
TX Board
(RM-RW 1)
1 PF
Connect a capacitor
having a small
coupling loss.
having a small
coupling loss.
– 15 –
Degree of Modulation Adjustment/Frequency
Adjustment
Adjustment
Connection:
Adjustment Method:
1. Set the Test Mode. (See page 14)
2. Press the
1. Set the Test Mode. (See page 14)
2. Press the
[SNOOZE/SLEEP OFF]
button (S704).
3. Rotating the RV701, adjust the degree of modulation so that
the modulation meter value is in a range from 60 kHz to 85
kHz.
kHz.
4. Press the
[RADIO/SLEEP]
button (S702).
5. Rotating the L701, adjust the shift frequency HIGH so that the
modulation meter indicates the frequency shift in a range from
312.53 MHz to 312.545 MHz.
312.53 MHz to 312.545 MHz.
6. Press the
[CD ]
button (S701).
7. Confirm that the shift frequency LOW at this time is in a range
from 312.455 MHz to 312.47 MHz.
8. Repeat steps 2 – 7.
Adjustment Location: TX Board (See page 16)
IF Adjustment
Connection:
Adjustment Method:
1. Connect an oscilloscope to the test point IF IN (HOT) of RX
1. Connect an oscilloscope to the test point IF IN (HOT) of RX
board.
2. Apply DC 5 V from external power supply to the 2 pin of
connector (BH601) on the RX board.
3. Adjust T601 so that the waveform becomes maximum and tar-
get form.
4. Confirm that the waveform is as shown in Fig. 1.
Adjustment Location: RX Board (See page 17)
oscilloscope
Degree of Modulation
Meter
TX Board
(RM-RW1)
TX Antenna terminal
input terminal 50
Ω
coaxial cable
^
RX board
TP (IF IN (HOT))
TP (IF IN (GND))
+
–
–
oscilloscope
Local Oscillation Adjustment /RF Adjustment
Connection:
Adjustment Method:
1. Set SG output to 0 dBµV (carrier frequency 312.5 MHz).
2. Connect an oscilloscope to the test point RF IN (HOT) of RX
1. Set SG output to 0 dBµV (carrier frequency 312.5 MHz).
2. Connect an oscilloscope to the test point RF IN (HOT) of RX
board.
3. Apply DC 5 V from external power supply to the 2 pin of
connector (BH601) on the RX board.
4. Adjust L607 so that the waveform becomes maximum.
(Local oscillation)
5. Adjust L601 and L602 so that the waveform becomes maxi-
mum. (RF Adjustment)
6. Adjust L603 and L608 so that the waveform becomes maxi-
mum. (RF Adjustment)
7. Adjust L604 so that the waveform becomes maximum.
(RF Adjustment)
8. Repeat steps 4 – 7.
9. Mount the shield cover, and make sure that the maximum value
9. Mount the shield cover, and make sure that the maximum value
of waveform does not change.
Adjustment Location: RX Board (See page 17)
FIg. 1
OK
FM RF SSG
Put the lead-wire
antenna close to
the RX board.
antenna close to
the RX board.
RX antenna terminal
(RF IN (HOT))
(RF IN (HOT))
coaxial cable
RX board
RX board
DATA OUT (HOT)
GND
+
–
–
oscilloscope
– 16 –
Adjustment Location:
[TX Board]
(Component Side)
L703
Output level Max. Adjustment
Output level Max. Adjustment
L701
Frequency Adjustment
Frequency Adjustment
L704
Output level Max. Adjustment
Output level Max. Adjustment
S704
S702
S701
L708
Output level Max. Adjustment
Output level Max. Adjustment
CT701
Antenna Peak Adjustment
Antenna Peak Adjustment
RV701
Degree of Modulation
Adjustment
Degree of Modulation
Adjustment
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