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SONY HCDXB44K
Service Manual


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

Description of SONY HCDXB44K 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 23 (click to view)
CD SECTION
Note: 1. CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. 2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. 3. Use an oscilloscope with more than 10MΩ impedance. 4. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks. 5. Adjust the focus bias adjustment when optical block is replaced.

S Curve Check
oscilloscope BD board TP (FEO) TP (VC) + –

Procedure: 1. Connect oscilloscope to test point TP (FEO). 2. Connect between test point TP (FOK) and GND by lead wire.

Focus Bias check
oscilloscope (DC range) BD board TP (RF) VC + –

3. Turn Power switch on. 4. Put disc (YEDS-18) in and turned Power switch on again and actuate the focus search. (actuate the focus search when disc table is moving in and out.) 5. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 3±1 Vp-p.
S-curve waveform

Procedure: 1. Connect oscilloscope to test point TP (RF). (GND terminal : VC) 2. Turned Power switch on. 3. Put disc (YEDS-18) in and playback. 4. Confirm that the shape “≈” can be clearly distinguished at the center of the waveform and check the RF signal level. • RF signal
VOLT/DIV: 200 mV TIME/DIV: 500 ns

symmetry

A within 3 ± 1 Vp-p B

6. After check, remove the lead wire connected in step 2.
Notes: • Try to measure several times to make sure than the ratio of A : B or B : A is more than 10 : 7. • Take sweep time as long as possible and light up the brightness to obtain best waveform.

level: 1.3 ± 0.3Vp-p

RF Level Check
oscilloscope BD board TP (RF) TP (VC) + –

Procedure: 1. Connect oscilloscope to test point TP (RF) on BD board. 2. Turned Power switch on. 3. Put disc (YEDS-18) in and playback. 4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.
Note: Clear RF signal waveform means that the shape “≈” can be clearly distinguished at the center of the waveform.

• RF signal
VOLT/DIV: 200 mV TIME/DIV: 500 ns

level: 1.3 ± 0.3Vp-p

— 23 —

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