DOWNLOAD Sony CFD-CD777SMK2 Service Manual ↓ Size: 3.3 MB | Pages: 63 in PDF or view online for FREE

13

0 dB=1 

µ

V

Setting:
FUNCTION switch : RADIO
BAND switch : FM

Setting:
FUNCTION switch : RADIO
BAND switch : MW

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.

FM  FREQUENCY  COVERAGE  ADJUSTMENT

Adjust for a maximum reading on level meter

L2

86.5 MHz

CT2

109.5 MHz

FM  TRACKING  ADJUSTMENT

Adjust for a maximum reading on level meter

L1

86.5 MHz

CT1

109.5 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

CT4

1,680 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

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 14)

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 

qk

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

14

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

15

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.

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.

+
–

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

This adjustment is to be done when the optical pick-up is replaced.

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 NX 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 18)

Put the set into test mode and perform the following checks.
Repair if there are any problems.

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

1. Press the NX 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 x button.

Confirm that focus search operation stops. If it does not , press
the x button again longer.

LCD801

IC801

JW811

JW812

16

A frequency response analyzer is necessary in order to perform
this adjustment exactly.
However, this gain has a margin, so even if it is slightly off, there
is no problem. Therefore, do not perform this adjustment.
Focus Tracking/gain determines the pick-up follow-up (vertical
and horizontal) relative to mechanical noise and mechanical shock
when the 2-axis device operate.
However, as these reciprocate, the adjustment is at the point where
both are satisfied.
• When gain is raised, the noise when the 2-axis device operates

increases.

• When gain is lowered, mechanical shock and skipping occurs

more easily.

• When gain adjustment is off, the symptoms below appear.

The following is a simple adjustment method.

Since exact adjustment cannot be performed, remember the posi-
tions of the controls before performing the adjustment. If the posi-
tions after the primary adjustment are only a little different, return
the controls to the original position.

• The time until music starts becomes longer for

STOP 

→ NX button or automatic selection.

(., > buttons pressed.)
(Normally takes about 2 seconds.)

• Music does not start and disc continues to

rotate for STOP 

→ NX button or automatic

selection.
(., > buttons pressed.)

• Sound is interrupted during PLAY.

Or time counter display stops progressing.

• More noise during 2-axis device operation

Gain

Focus

Tracking

Symptoms

low

low

or

high

–

low

–

low

high

high

+
–

Solder bridge (TRACKING)

Solder bridge (FOCUS)

TP (VC)

oscilloscope

(DC range)

This adjustment is to be done when the optical pick-up is replaced.

1. Connect the oscilloscope to solder bridge (FOCUS) and TP

(VC) on  the MAIN board.

2. Put the set into test mode. (See page 24.)
3. Optical pick-up setting to the center by > or . button

pushing. (Move the optical pick-up to the music area on the
disc to enable easy visibility of the eye pattern.)

4. Put the disc (YEDS-18) and press NX button.

From focus searching, focus is turned ON while entering
CLV drawing-in mode. Tracking and sled are turned OFF.

5. Press the NX button.

[Both tracking and sled are turned ON.]

6. Adjust RV701 so that the oscilloscope waveform is as shown

in the figure below (eye pattern).
A good eye pattern means that the diamond shape (

≈ ) in the

center of the waveform can be clearly distinguished.

7. Release the test mode after adjustment is completed.

Adjustment Location: MAIN board (See page 18)

+
–

MAIN board

Solder bridge (FOCUS)

TP (VC)

oscilloscope

(AC range)

VOLT/DIV: 0.2 V (with the 10: 1 probe in use)
TIME/DIV: 500 ns

1.2 

±

 0.2 Vp-p

When observing the eye pattern, set the oscilloscope 
for AC range and raise vertical sensitivity.