DOWNLOAD Sony CFD-CD777S Service Manual ↓ Size: 4.49 MB | Pages: 60 in PDF or view online for FREE

Model
CFD-CD777S
Pages
60
Size
4.49 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfd-cd777s.pdf
Date
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– 13 –
3. Phase Check
Mode: FWD/REV playback (DECK A)
FWD playback (DECK B)
4. Set in the REV mode and repeat the step 1 to 3.
5. After the adjustment, lock the screws with locking compound.
Adjustment Location:
Tape Speed Adjustment
Procedure:
Mode: FWD/REV playback (DECK A)
FWD playback (DECK B)
Adjustment Values:
Frequency difference between the beginning and the end of the
tape should be within 1% (30 Hz)
Note:
 (High speed: non Adjustment)
Adjustment Location: MAIN board (See page 15.)
Adjustment part
Frequency counter
RV302
2,910 to 3,090 Hz
+
–
V
H
+
–
Screen pattern
Good
Wrong
in phase 45 
°
90 
°
135 
°
180 
°
L-CH
R-CH
set
32 
Ω
32 
Ω
oscilloscope
PHONES jack (J301)
test tape
P-4-A063
(6.3 kHz, –10 dB)
+
–
set
32 
Ω
frequency 
counter
PHONES jack (J301)
test tape
WS-48B
(3kHz, 0 dB)
DECK-A     DECK-B
deck A
deck B
screw
driver
– 14 –
TUNER  SECTION
0 dB=1 
µ
V
[FM]
Setting:
FUNCTION switch : RADIO
BAND switch : FM
[MW]
Setting:
FUNCTION switch : RADIO
BAND switch : MW
[SW]
Setting:
FUNCTION switch : RADIO
BAND switch : SW1/SW2
FINE TUNING knob ...................................... Mechanical center
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
(
): Saudi Arabia model
FM  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5 MHz (87.35 MHz)
CT2
109.5 MHz (107.8 MHz)
FM  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5 MHz (87.35 MHz)
CT1
109.5 MHz (107.8 MHz)
AM  IF  ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
MW  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520 kHz (516 kHz)
CT4
1,680 kHz (1,630 kHz)
MW  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620 kHz
CT3
1,400 kHz
SW1  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
2.2 MHz
CT6
7.3 MHz
SW1  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
2.2 MHz
CT5
7.3 MHz
SW2  FREQUENCY  COVERAGE  ADJUSTMENT
Adjust for a maximum reading on level meter.
L8
6.8 MHz
CT8
22.5 MHz
SW2  TRACKING  ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
6.8 MHz
CT7
22.5 MHz
FM  VCO Adjustment
Setting:
Procedure:
1. Connect the frequency counter to pin 4 and 7 of IC1 as shown
the figure below.
2. Tune the set to 98 MHz.
3. Adjust RV2 for 76 kHz ± 500 Hz reading on the frequency
counter.
Adjustment Location: MAIN board (See page 15.)
Put the lead-wire
antenna close to 
the set.
AM RF SSG
30% amplitude modulation by
400 Hz signal
output level: as low as possible
FM RF SSG
0.01 
µ
F
FM/SW
telescopic
antenna
terminal
22.5 kHz frequency deviation
by 400 Hz signal.
output level: as low as possible
AM RF SSG
12 PF
FM/SW
telescopic
antenna
terminal
30% amplitude modulation by
400 Hz signal
output level: as low as possible
+
–
set
32 
Ω
PHONES jack (J301)
level meter
0.001 
µ
F
MAIN board
IC1 pin 
!•
set
FM RF SSG
Carrier frequency : 98 MHz
Modulation
: 400 Hz, 30% FM modultion
Output level
: 0.1 V (100 dB)
+
–
MAIN board
IC1 pin 
4
+
IC1 pin 
7
1 
µ
F
33 k
 
Ω
frequency counter
– 15 –
Adjustment Location:
[MAIN Board] (Component Side)
T1 AM IF Adjustment
RV2
FM VCO Adjustment
L3 CT3
FM Tracking
Adjustment
MW Tracking
Adjustment
CT2
L2
L5
CT5
L4
CT4
MW Frequency
Coverage 
Adjustment
SW1
Frequency
Coverage 
Adjustment
FM Frequency
Coverage 
Adjustment
SW1
Tracking
Adjustment
SW2
Tracking
Adjustment
CT1
L1
CT7
L7
L6 CT6
SW2
Frequency
Coverage 
Adjustment
L8 CT8
RV302
Tape Speed
Adjustment
FM/SW
Antenna
Terminal
IC1
JW27
– 16 –
CD SECTION
Notes on Adjustment
1. Perform adjustment in test mode.
After adjustments, be sure to release test mode.
2. Perform adjustments in the order given.
3. Use the disc (YEDS-18. Part No. 3-702-101-01) only when so
indicated.
How to Put the Set into Test Mode
1. Short-circuit the JW811 and JW812 on the CONTROL board.
2. Turn on the power.
3. Open the short-circuit to release test mode.
[CONTROL Board] (Component Side)
+
–
MAIN board
Solder bridge (TRACKING)
TP (VC)
oscilloscope
(DC range)
A
B
A
B
A=B
0 V
0 V
C
A=B     C=180 mVp-p to 420 mVp-p
E-F Balance Adjustment
This adjustment is to be done when the optical pick-up is replaced.
Procedure:
1. Connect the oscilloscope to solder bridge (TRACKING) and
TP (VC) on the MAIN board.
2. Put the set into test mode.
3. Optical pick-up setting to the center by 
+ or = button
pushing.
4. Put the disc (YEDS-18) and press 
^ button.
From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.
5. Adjust RV703 so that the oscilloscope traverse waveform is
symmetrical, as shown in the figure below.
6. Release the test mode after adjustment is completed.
Note: Take long sweep time
for easy monitoring.
VOLT/DIV : 0.2 V (with the 10:1 probe in use.)
TIME/DIV : 5 ms
Adjustment Location: MAIN board (See page 19.)
Before Begining Adjustment
Put the set into test mode and perform the following checks.
Repair if there are any problems.
• Sled Motor Check
Press the 
+, = buttons and confirm that the optical pick-up
moves smoothly from the innermost to outermost circumference
and back smoothly and with no catching or abnormal noises.
+ : Optical pick-up moves to the outer circumference
= : Optical pick-up moves to the inner circumference
• Focus Search Check
1. Press the 
^ button. (Focus search operation is performed
continuously.)
2. Look at the optical pick-up objective lens and confirm that it
moves up and down smoothly, when no catching or abnormal
noises.
3. Press the 
p button.
Confirm that focus search operation stops. If it does not , press
the 
p button again longer.
LCD801
IC801
JW811
JW812
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