Sony icf-28 Service Manual Download Page 3

– 3 –

– 4 –

0 dB = 1µV

[FM]

Setting:
Band switch: FM

[AM]

Setting:
Band switch: AM

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.

• Remove FM antenna in FM adjustments.

Adjustment Location:

FM  FREQUENCY  COVERAGE  ADJUSTMENT

Adjust for a maximum reading on level meter.

L3

86.5 MHz (64.0MHz)

CT3

109.5 MHz

FM  TRACKING  ADJUSTMENT

Adjust for a maximum reading on level meter.

L2

86.5 MHz (64.0MHz)

CT2

109.5 MHz

AM  FREQUENCY  COVERAGE  ADJUSTMENT

Adjust for a maximum reading on level meter.

L4

520 kHz

CT4

1,750 kHz

AM  TRACKING  ADJUSTMENT

Adjust for a maximum reading on level meter.

L1

600 kHz

CT1

1,400 kHz

AM  IF  ADJUSTMENT

Adjust for a maximum reading on level meter.

T1

455 kHz

CABINET  (REAR)  ASSY

Note:

 Follow the disassembly procedure in the numerical order given.

SECTION  2

DISASSEMBLY

SECTION  3

ELECTRICAL  ADJUSTMENTS

(      ):  East European model

FM RF signal

generator

22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible

+

level meter

speaker terminal

set

FM antenna terminal

0.01 

µ

F

AM RF signal 

generator

30% amplitude
modulation by
400 Hz signal
Output level: as low as possible

Put the lead-wire
antenna close to 
the set.

+

level meter

speaker terminal

set

CT3

L3

FM Frequency

Coverage

Adjustment

CT4

L4

AM Frequency

Coverage

Adjustment

FM Tracking

Adjustment

 L2    CT2   

FM
Antenna in

AM Tracking

Adjustment

 L1     CT1   

IC1

Speaker in

T2

T1

AM IF

Adjustment

[MAIN board] (Component Side)

POINTER  SETTING

6

cabinet (rear) assy

8

lug, 3

2

two claws

1

claw

9

telescopic antenna

5

claw

INLET board

3

lid, battery case

4

six screws
(BTP3 

×

 14)

two screws
(P3 

×

 10)

7

screw
(P2.6 

×

 8)

5

Mount the pointer

3

two claws

3

claw

2

knob (TUNE)

1

Turn CV1 fully in 
the arrow direction.

6

Insert the pointer to the knob (TUNE)
fitting the concave position of the pointer 

     to the convex position of the knob (TUNE).

4

chassis

w w w . x i a o y u 1 6 3 . c o m

Q Q 3 7 6 3 1 5 1 5 0

9

9

2

8

9

4

2

9

8

T E L

1 3 9 4 2 2 9 6 5 1 3

9

9

2

8

9

4

2

9

8

0

5

1

5

1

3

6

7

3

Q

Q

TEL  13942296513  QQ  376315150  892498299 

TEL  13942296513  QQ  376315150  892498299 

http://www.xiaoyu163.com

http://www.xiaoyu163.com

Summary of Contents for icf-28

Page 1: ...SUPPLEMENTS PUB LISHED BY SONY SPECIFICATIONS CF2 CF3 mark Mark Center frequency red 10 70 MHz blue 10 67 MHz orange 10 73 MHz black 10 64 MHz white 10 76 MHz HOW TO CHANGE THE CERAMIC FILTERS This model is used two ceramic filters of CF2 and CF3 You must used same type of color marked ceramic filters in order to meet same specifications Therefore the ceramic filter must changed two pieces togethe...

Page 2: ...rom instruction manual www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 3: ...by 400 Hz signal Output level as low as possible level meter speaker terminal set FM antenna terminal 4 Ω 0 01 µF AM RF signal generator 30 amplitude modulation by 400 Hz signal Output level as low as possible Put the lead wire antenna close to the set level meter speaker terminal set 4 Ω CT3 L3 FM Frequency Coverage Adjustment CT4 L4 AM Frequency Coverage Adjustment FM Tracking Adjustment L2 CT2 ...

Page 4: ...Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 5: ...Q Q 3 7 6 3 1 5 1 5 0 9 9 2 8 9 4 2 9 8 T E L 1 3 9 4 2 2 9 6 5 1 3 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

Page 6: ... 501 222 81 ANTENNA TELESCOPIC FM D3 8 719 042 69 LED LN21RPL TUNE J101 1 526 838 11 INLET AC 2P SP1 1 544 518 11 SPEAKER T2 1 450 324 21 TRANSFORMER POWER 1 670 706 11 INLET BOARD AC INLET J101 1 526 838 11 INLET AC 2P AC IN A 3683 007 A MAIN BOARD COMPLETE AEP UK AR AUS A 3683 008 A MAIN BOARD COMPLETE EE 1 535 771 11 TERMINAL CAPACITOR C1 1 163 101 00 CERAMIC CHIP 22PF 5 50V C2 1 163 059 91 CER...

Page 7: ...NSFORMER POWER MISCELLANEOUS ANT1 1 501 222 81 ANTENNA TELESCOPIC FM SP1 1 544 518 11 SPEAKER ACCESSORIES PACKING MATERIALS 1 751 115 11 CORD POWER UK 1 769 412 11 CORD POWER AEP EE AUS 3 862 928 11 MANUAL INSTRUCTION ENGLISH FRENCH GERMAN SPANISH 3 862 928 21 MANUAL INSTRUCTION DUTCH POLISH RUSSIAN The components identified by mark or dotted line with mark are critical for safety Replace only wit...

Page 8: ...in Singapore 1998 9 Published by Quality Engineering Dept Shibaura www xiaoyu163 com QQ376315150 9 9 2 8 9 4 2 9 8 TEL 13942296513 9 9 2 8 9 4 2 9 8 0 5 1 5 1 3 6 7 3 Q Q TEL 13942296513 QQ 376315150 892498299 TEL 13942296513 QQ 376315150 892498299 http www xiaoyu163 com http www xiaoyu163 com ...

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