Sony CFD-V6 Service Manual page 11

• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT4
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
Adjustment Location : Main board (See page 12)
CD SECTION
How to put the set into CD Test Mode
1. Set the function switch to power off.
2. Set the function switch to CD.
3. Set Test mode by momentarily shorting both of the IC801 51pin
to GND. (Shorting the terminals momentarily is sufficient).
The set is into CD test mode (88 is displayed).
4. Turn the power off to release test mode.
[MAIN BOARD] (Conductor side)
GND
TEST mode : momentarily short
455kHz
520kHz
1,780kHz
620kHz
1,400kHz
10.7MHz
86.5MHz
109.5MHz
86.5MHz
109.5MHz
51pin
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
Focus Bias Check
1. Connect the oscilloscope between TP (RF) and GND on CD
board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the 7 button two times (LPC ON).
4. Confirm that the oscilloscope waveform is as shown in the fig-
ure below. (eye pattern)
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/TV : 200mV
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise certical sensitivity
[CD BOARD] (Conductor side)
CFD-V6
RF level
0.7 – 1.0 Vp-p (LPC ON)
1.0 – 1.4 Vp-p (LPC OFF)
oscilloscope
(AC range)
TP (RF)
(GND)
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