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SONY ICF28
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY ICF28 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 3 (click to view)
SECTION 2 DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.

SECTION 3 ELECTRICAL ADJUSTMENTS
0 dB = 1µV
[FM] Setting: Band switch: FM
FM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. L3 86.5 MHz (64.0MHz) CT3 109.5 MHz

CABINET (REAR) ASSY
9 telescopic antenna 1 claw 3 lid, battery case

FM RF signal generator 0.01 µF

FM antenna terminal 4Ω set

level meter + –

FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L2 CT2 86.5 MHz (64.0MHz) 109.5 MHz

!¡ INLET board 5 claw !º two screws (P3 × 10) 2 two claws

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

speaker terminal
AM FREQUENCY COVERAGE ADJUSTMENT Adjust for a maximum reading on level meter. L4 520 kHz 1,750 kHz

[AM] Setting: Band switch: AM
AM RF signal generator Put the lead-wire antenna close to the set. 4Ω set 30% amplitude speaker terminal modulation by 400 Hz signal Output level: as low as possible + – level meter

CT4

4 six screws (BTP3 × 14) 7 screw (P2.6 × 8)

AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter. L1 CT1 AM IF ADJUSTMENT Adjust for a maximum reading on level meter. T1 455 kHz 600 kHz 1,400 kHz

8 lug, 3 6 cabinet (rear) assy

• 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: [MAIN board] (Component Side)
FM Antenna in AM Tracking Adjustment L1 CT1

(

): East European model

FM Tracking Adjustment L2 CT2

POINTER SETTING

4 chassis 3 two claws

L4 T1 AM IF Adjustment CT4 CT3 L3 IC1 Speaker in

AM Frequency Coverage Adjustment FM Frequency Coverage Adjustment

5 Mount the pointer

2 knob (TUNE)

3 claw

1 Turn CV1 fully in the arrow direction.

T2
6 Insert the pointer to the knob (TUNE) fitting the concave position of the pointer to the convex position of the knob (TUNE).

–3–

–4–

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