Sony FD-525, Service Manual

Adjustment Location 

: A board (component side)

3-2. TV SECTION

Setting :

MODE switch

: TV

TV BAND switch : VHF or UHF

Centering Adjustment

Procedures :

,

1.

Tune in off-the-air signal.

2.

Adjust the centering magnet so that the picture is in the

center.

3. After the adjustment, look the magnets with suitable

locking compound.

Adjustment Location :

centering magnet

adjustment screw

C R T

 Adjustment

Procedure :

Adjust RV601 for 

 reading on collector voltage of Q601.

Horizontal Frequency (H-HOLD) Adjustment

Procedures :

1.

Connect between 

 pin   and pin   with 

 resis-

tor.

2.

Connect the frequency counter to 

 pin 

3.

Adjust RV501 for a 

 reading on frequen-

cy counter.

4.

After the adjustment, remove the resistor in item 1.

Vertical Amplitude (V-SIZE) Adjustment

Procedures :

1.

Tune in an off-the-air signal.

2.

Adjust RV551 for the best vertical amplitude.

RF AGC Adjustment

Procedures :

1.

Tune in an off-the-air signal.

2.

Adjust 

 so that snow noise disappears from the

picture.

V-S 

Tuning Adjustment

Procedures :

1.

Short 

 (CH CALL).

(State where the display bar is shown on the screen.)

2.

Set S151 (TV BAND) to the VHF side.

3.

Receive the broadcast of 2CH by pushing 

 (CHAN-

NEL-) or 

 ().

4.

Adjust RV103 so that the display bar is corresponded to
the position of 2CH.

5.

Receive the broadcast of 

 and adjust 

 so that

the display bar is corresponded to the 13CH.

Note :

Since the items 4 and 5 will interfere each other, the
adjustment is necessary for 2 to 3 times.

6.

Receive the broadcasts of 2 to 

 and check if the

display bar is corresponded to each channel.

7.

Set S151 (TV BAND) to the UHF side.

8.

Receive the broadcast of 

 and adjust RV104 so that

the display bar is corresponded to the position of 14CH.

9.

Receive the broadcast of 

 and adjust RV102 so that

the display bar is corresponded to the position of 69CH.

Note :

Since the items of 8 and 9 will interfere each other,

the adjustment is necessary for 2 to 3 times.

10. Receive the broadcasts of 14CH to 

 and check if the

display bar is corresponded to the position of each chan-
nel.

11. Disconnect the 

 shorted in the above item 1.