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SONY HCDF250AV
Service Manual


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

Description of SONY HCDF250AV 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 24 (click to view)
CD SECTION
Note :

1. 2. 3. 4.

CD Block is basically designed to operate without adjustment. Therefore, check each item in order given. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated. Use an oscilloscope with more than 10M⦠impedance. Clean the object lens by an applicator with neutral detergent when the signal level is low than specified value with the following checks.
oscilloscope BD board

10. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not. 11. Turn OFF the power, and remove the lead wire connected at step 7. Note : A clear RF signal waveform means that the shape âââ can be clearly distinguished at the center of the waveform.
RF signal waveform VOLT/DIV : 200mV TIME/DIV : 500ns level : 1.8 ± +0.3 Vp-p â0.2

TP (FE) TP (VC)

S Curve Check Procedure : 1. Press the 1/u button to turn ON the power . 2. 3. 4. 5. 6. 7. Open the front cover, and press the CD PLUS ONE button. Set the disc (YEDS-18) into the âPLUS ONEâ slit. Close the front cover, and chuck the disc. Press the 1/u button to turn OFF the power. Connect the oscilloscope to TP (FE) of the BD board. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire. 8. Press the 1/u button to turn ON the power. 9. The first track will be played back automatically. When the CHECK button is pressed, âS JIâ will be displayed on the fluorescent indicator tube, and focus search will be repeated. 10. Check the oscilloscope waveform (S-curve) is symmetrical between A and B. And confirm peak to peak level within 1.8 ± 0.6 Vp-p.
S-curve waveform symmetry

E-F Balance (Traverse) Check The procedure for this checking method differs for when a general remote control unit is used and not used.
oscilloscope BD board TP (TE) TP (VC)

When a general remote commander is used: 1. Press the 1/u button to turn ON the power. 2. Open the front cover, and press the CD PLUS ONE button. 3. Set the disc (YEDS-18) into the âPLUS ONEâ slit. 4. Close the front cover, and chuck the disc. 5. Press the 1/u button to turn OFF the power. 6. Connect the oscilloscope to TP (TE) of the BD board. 7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire. 8. Press the 1/u button to turn ON the power. 9. Playback the fifth track of the disc. 10. Press the 3 button on the remote commander. (The tracking servo and the sledding servo are turned OFF.) 11. Check the level B of the oscilliscope's waveform and the A (DC voltage) of the center of the Traverse waveform. Confirm the following : A/B x 100 = less than ± 10%
Traverse waveform Center of the waveform

A within 1.8 ± 0.6Vp-p B

11. Turn OFF the power, and remove the lead wire connected at step 7. Note : ⢠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.
0V

B A (DC voltage)

RF Level Check
oscilloscope BD board TP (RF) TP (VC) level : 0.7 ± 0.3 Vp-p 12. Press the 8 button on the remote control unit. (The tracking servo and sledding servo are turned ON.) Confirm the C (DC voltage) is almost equal to the A (DC voltage) is step 11. Traverse waveform

Procedure : 1. Press the 1/u button to turn ON the power. 2. Open the front cover, and press the CD PLUS ONE button. 3. Set the disc (YEDS-18) into the âPLUS ONEâ slit. 4. Close the front cover, and chuck the disc. 5. Press the 1/u button to turn OFF the power. 6. Connect the oscilloscope to TP (RF) of the BD board. 7. Connect TP (ADJ) of the MAIN board and connect TP (GND) with a lead wire. 8. Press the 1/u button to turn ON the power. 9. Playback the fifth track of the disc.

C (DC 0V Tracking servo Sled servo ON voltage)

Tracking servo Sled servo OFF

13. Turn OFF the power, and remove the lead wire connected at step 7.

â 24 â

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