Sony CFD-V7 - FM FREQUENCY COVERAGE ADJUSTMENT; CD SECTION; How to put the set into CD Test Mode; Focus Bias Check

11
CFD-V3/V7/V7L
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
( ) : V3/V7: AEP, UK, CET, SP,KR
< > : V7:Italian
[ ] : V7L
AM/LW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2 455kHz
EXCEPT V7L
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 520kHz ( 520kHz) < 516kHz>
CT4 1,780kHz (1,680kHz) <1,630kHz>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 620kHz
CT3 1,400kHz
V7L
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4 145kHz
CT4, CV2 300kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3 160kHz
CT3, CV3 260kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1 10.7MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2 86.5MHz ( 87.0MHz) < 87.35MHz> [ 87.0MHz]
CT2 109.5MHz (108.3MHz) <108.25MHz> [108.3MHz]
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1 86.5MHz ( 87.0MHz) < 87.35MHz> [ 87.0MHz]
CT1 109.5MHz (108.3MHz) <108.25MHz> [108.3MHz]
Adjustment Location : Main board (See page 12)
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)
When observing the eye pattern, set the oscilloscope for AC range
and raise certical sensitivity
RF level
0.7 – 1.0 Vp-p (LPC ON)
1.0 – 1.4 Vp-p (LPC OFF
)
VOLT/TV : 200mV
TIME/DIV : 500 nS
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.
S351
R812
R811
R809
R810
-1 -2
R851
C844
C
8
C8
R815
R814
R813
C801
R816
R
JC310
C810
JW316
JW317
JW318
320
21
IC801
GND
51pin
TEST mode : momentarily short
[MAIN BOARD] (Conductor side)
C730
R730
R729
C704
C736
C734
R704
R702 R703 R705 R701
C703
IC701
C731
R706
C
703
C743
C744
C
4
2
R709
R710
R708
C705
R711
TP
(RF)
J
J
W
JW726
C
C747
JW710
9
oscilloscope
(AC range)
[CD BOARD] (Conductor side)
(GND)
TP (RF)
• Abbreviation
CET : East European & Russian
SP : Singapore