Pioneer-PDX66-cd-adj电路图 维修手册.pdf

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1、PD-X66 10.ADJUSTMENTS The adjustments for this unit ars given below. Adjustments must be made in the order in which they are listed. ADJUSTMENTS 1. Tracking error offset, focus offset and RF offset adjustment 2. LD (laser diode) power check 3. Focus lock and spindle lock check 4. Grating adjustment

2、5. Tracking balance adjustment 6. Tangentia! adjustment 7. R F level check 8. Focus gain adjustment 9. Tracking gain adjustment 10. VCO fnse run frequency adjustment REQUIRED EQUIPMENT 1. Dual trac oscilioscope 2. Optical power meter 3. Test disc ( Y E D S 7 ) 4. Loop gain adjustment filter 5. Signa

3、l generatorr 6. Frequency counter 7. Other regular measuring equipment ABOUT THE TEST MODE All adjustments must be carried out with the unit in tiie test mode. -How lo aciivale atxi release tlie lest nxide To activate the test mode, turn ON the power switch (S301) with the test mode switch (SI) in t

4、he ON position. (2)The test mode is nsleased by turning the power switch O FF. Tlie functions of the keys in the test mode are outlined in Table lO-I. ADJUSTMEhTT VRs AND THEIR NAMES VRl: Laser power VR2: R F offset (RF.OFS) VR3: Focus gain (FCS.GAN) VR4: Tracking gain (TRK.GAN) VRS: Tracking balanc

5、e (TRK.BAL) VR6: Focus offset (FCS.OFS) VR7: Tracking offset (TRK.OFS) VRS: VCO adjust (VCO.ADJ) Adjustment Point 1 TPl 6 VR2 VR4(SlP n V R 3 VR6 S.GND VR5 tel) VR7 IC6 121 S I 30 RadioFans.CN 收音机爱 好者资料库 In the test mode, the servos must be closed and opened individually. Consequently, the servos mu

6、st each be closed in the proper sequence (serial se- quence) in order to put the machine into the play mode. Note also that the machine will not enter the play mode when the PAUSE ( D ) key is pressed. For example, in order to change from the stop to the play mode, the function keys must be pressed

7、in the following order: In the test mode, the servos must be operated in seria! sequence. Test mode tCH ON t ON Q O ON Test mode TRACK FWD KEY PLAY KEY PAUSE KEY PLAY mode Focus servo is closed Spindle servo is closed Tracking servo is closed KJ KEY FUNCTIOB IN THE TEST MODE Symbol Key name Function

8、 in test mode Description IOI TRACK FWD Focus servo close Turns ON the laser diode, and raises and lowers the focusing actuator to close the focus servo. O PLAY Spindie serw close Closes the serw in the CLV-A mode after kick- ing the spindle motor. 00 PAUSE Tracking servo close/open Acts as a toggle

9、: closes the tracking servo and activates play mode when pressed (provided the focus and spindle servos are closed), at which time the PAUSE indicator illuminates; opens the tracking servo when pressed again. 1 MANUAL SEARCH REV Carriage reverse (moves inward) Moves carriage quickly (3cm/s) toward i

10、nner- most track. Be careful not to move too far as there is no safety device to stop the carriage. MANUAL SEARCH FWD Carriage forward (moves outward) Moves carriage quickly (3cm/s) toward outer- most track. Be careful not to move too far as there is no safety device to stop the carriage. STOP Stop

11、Stops all servos and returns system to its initial state. 0 PER/CLOSE Disc tray open/close Opens and closes the disc tray. However, pickup does not return to rest on OPEN, and it remains stationary on CLOSE. Table 10-1. 31 RadioFans.CN 收音机爱 好者资料库 4 In the test mode. the servos must be closed and ope

12、ned Individually. Consequently, the servos must each be closed in the proper sequence (serial se- quence) in order to put the machine into the play mode. Note also that the machine will not enter the play mode when the P A U S E ( DO ) key is pressed. For example, in order to c h a n from the stop t

13、o the play mode, the function keys must be pressed in the following orden * In the test mode, the servos must be operated in serial sequence. Test mode I1 ON O ON 00 ON Test mode TRACK FWD KEY PLAY KEY PAUSE KEY PLAY mode Focus serve is closed Spindle servo is closed ( Tracking servo is closed J 1 i

14、 KEY FUNCTIONS IN THE TEST MODE Symbol Key naiiie Function in test mode Description tOI TRACK FWD Focus servo close Turns ON the laser diode, and raises and lowers the focusing actuator to close the focus servo. O PLAY Spindie servo close Closes the servo ir; the CLV-A mode after kick- ing the spind

15、le motor. 00 PAUSE Tracking servo close/open Acts as a toggle: closes the tracking servo and activates play mode when pressed (provided the focus and spindle servos are closed), at which time the PAUSE indicator illuminates; opens the tracking servo when pressed again. : MANUAL SEARCH REV Carriage r

16、everse (moves inward) Moves carriage quickly (3cm/s) toward inner- most track. Be careful not to move too far as there is no safety device to stop the carriage. MANUAL SEARCH FWD Carriage forward (moves outward) Moves carriage quickly (3cm/s) toward outer- most track. Be careful not to move too far

17、as there is no safety device to stop the carriage. STOP Stop Stops all servos and returns system to its initial state. 0 PER/CLOSE Disc tray open/close Opens and closes the disc tray. However, pickup does not return to rest on OPEN, and it remains stationary on CLOSE. Table 10-1. C 3 1 RadioFans.CN

18、收音机爱 好者资料库 Step No. Oscilloscope Setting Test Points Adjusting Points Checit items/ Adjustment specifications Adjustment procedure Step No. V 1 H Test Points Adjusting Points Checit items/ Adjustment specifications Adjustment procedure 1 Tracking etror offset, focus offset and RF offset adjuslment T

19、P1 Pin 2 (TRK. ERR) TP1 Rn 6 (FCS. ERR) TP1 Pin 1 (RF. OUTPUT) VR5 (TRK. BAL) VR7 (TRK OFS) VR6 (FCS.OFS) VR2 (RF.OFS) Tracking error offset 45 0V + 50mV Focus offset OV 50mV RF offset lOOmV 50mV Put unit in ttie test mode (see page 30). Set VR5 TRK.BAL (tracking balance) to thie position about 45 t

20、o thie left of center. Adjust VR7 TRK.OFS(tracking offset) so that ihe TRK.ERR (tracking error) voltage at TP1 pin 2 becomes OV 50nnV. Adjust VR6 FCS.OFS (focus offset) so that the FCS.ERR (focus error) voltage al TP1 pin 6 becomes OV + 50mV. Adjust VR2 RF.OFS (RF offset) so that the RF output volta

21、ge at TP1 pin 1 becomes 100mV 50mV. Note: When adjusting the tracking error off- set, always perform 5. Tracking Bal- ance Adjustment. 2 LD (laser diode) power check VR1 Specification; 0.13mW 0.01 mW Put unit in the test mode (see page 30). Press the TRACK FWD ( t w ) key to turn ON the laser diode.

22、 Place the sensor of the optical power meter directly above the objective lens and confirm that LD power is 0.13mW + 0.01 mW. If the reading is not conforms specification, adjust VR1 (LD power adjust) so that the laser diode power conforms to specifica- tion. 3 Focus lock and spindle lock check V 0.

23、5V/div H lOOmsec/ div TP1 pini (RF output) RF signal is output Forward (clockwise) rotation Set the test disc. Put unit in the test mode (see page 30). Press the MANUAL SEARCH FWD (tC ) key to move the pickup to the center of the disc. Observe the output of TP1 pin 1 (RF output) on the oscilloscope.

24、 Confirm that the RF signal is output after the TRACK FWD (IX) key is pressed. Press the PLAY ( t ) key and confirm that the disc rotates at constant speed (approx. 30 rpm near center of disc) in the fon/ard (clockwise) direction; disc may not run away or rotate counterclockwise. 3 2 Step No. Oscill

25、oscope Setting Test Points Adjusting Points Check items/ Adjustment specifications Adjustment procedure Grating adjuslmenl (1) Rack Fig. 10-1 Clamp holder 4 steel ball Clamper rClamp relainer Disc tray Fig. 10-2 Remove the disc tray before beginning this adjustment. Removal of the disc tray 1. Press

26、 the rear edge of the rack, marked in Fig. 10-1, while pulling the disc tray out to the position where it catches, illustrated in Fig. 10-2. A 2. Whiie pulling the clamp holder () (see Fig. 10-2) upward with the right hand, hold the tray as indicated by in the left hand and pull it outward. Take car

27、e not to ailow the 44 steel ball to fall (we recommend holding the ball in place with the left index finger whiie extracting the tray). Fig. 10-3 Clamp retainer Clamper Fig. 10-4 3 3 PD-X66 Step No. Oscilloscope Setting H Test Points Adjusting Points Check items/ Adjustment specifications Adjustment

28、 procedure 0 Screwdriver Pickup Disc table Fig.10-5 TP1 LPF Pin 2 (TRK.ERR) Pin 4 (GND) 2S 1 0.00111 Fi ; . 1 . 1 1 i 1 1 1 Fig. 10-6 0.5V/div 5ms/div TP1 Pin 2 TRK. ERR Grating adjusting screw Grating adjusting screw Null pcint Max. amplitude Put unit in ttie test mode (see page 30). Press the MANU

29、AL SEARCH FWD to) key to move the pickup to the vicinity of what would be the center of the disc. Position the pickup so its grating adjusting screw is visible through the eiongated hole on the spindle motor side of the servo mechanism base plate. As shown in Fig. 10-5, insert a (slotted) screwdrive

30、r from the rear of the mechan- ism and check that the grating adjusting screw can be rotated. Mount the test disc; be sure to insert a 3 5 mm spacer (if no spacer is avaiiable, use a hex wrench) between the damp bolder and ciamp retainer, as shown in Fig. 10-3. Confirm that the clamper and the damp

31、retainer are not contacting one another (Fig. 10-4). Press the TRACK FWD ( c ) and the PLAY ( keys sequentially to close the focus and spindle servos (do not close the tracking servo). Insert a 4kHz-cutoff low pass filter be- tween the oscilloscope and TP1 pins 2 (TRK.ERR) and 4 (GND) as shown in Fi

32、g. 10-6 and observe the waveform of TP1 pin 2 (tracking error) on the oscilloscope. Turn the grating adjusting screw with the screwdriver to find the null point (see Photo 10-1). Next, slowly rotate the screw dockwise and adjust to the point where the wave- form (tracking error signal) first achieve

33、s its maximum amplitude (see Photo 10-3). Note: Avoid applying pressure to the screwdriver while adjusting the screw. Doing so causes the pickup to move inward, making adjustment more diffi- cult. Lastly, remove the low confirm that the tracking voltage does not greatly pickup is moved to the outer-

34、most tracks of the d If the levels diverge by re-adjust the maximum point by rotating the g screw. pass filter and error signal p-p vary when the inner-most and isc. 10% or more, error amplitude rating adjusting 3 4 Step No. Oscilloscope Setting Test Points Adjusting Points Check items/ Adjustment s

35、pecifications Adjustment procedure Bearing Loading base Slide base 4)4 steel ball Re-mount the disc tray according to the fol- lowing procedure when the grating adjust- ment is complete. 1. Remove the disc and the spacer. 2. While lifting the damp holder marked () in Fig. 10-2 with the right hand, h

36、old the tray in the left hand as indicated by (c) and slide the slide base into the hard resin fittings on the loading base as shown in Fig. 10-7 to re-insert the disc tray. At this time, be sure to hold the steel ball in place with the index finger of the left hand. Also, be careful that the front

37、panel is not damaged by the slide base and bearing of the steel balls bearing (in the slide base) coming Into contact with the panel. 3. Insert the slide base so thal it fits into the two hard resin fittings at the rear of the loading base (see Fig. 10-8). 4. Insert the tray all the way. FJQ. 10-8 G

38、 Photo 10-1 Null point r Flioto 10-2 This is not the null-point wavelorm. Rioto 10-3 Maximum amplitude 3 5 Step No. Oscilloscope Setting Test Points Adjusting Points Check items/ Adjustment Adjustment procedure V H specifications Grating Adjustment (2) (using discs wilh a recording time of 60 min. o

39、r more) 0.5V/div Screwdriver Grating adjustment screw Disc 5ms/div Fig.10-9 TP1 Pin 2 TRK.ERR Grating Grating Nuil point Maximum amplitude Rn 2 (TRK.ERR) Pin 4 (GND) Fig.10-10 Note: This adjustment can only be performed with a disc having pits up to R115mm, not with the Test Disc (YEDS-7). Put unit

40、in the test mode (see page 30). Load the test disc, shift the pickup to the outer periphery so that the pickup grating adjustment hole is visible trom the pit surface of the disc or trom the hole in the servo mechanism (see Fig. 10-9). Press the TRACK FWD key (t) and PLAY key t ) in sequence to turn

41、 on the focus servo and spindle servo (do not turn on the tracking servo). Observe the TRK.ERR (tracking error) waveform at TP1 pin 2 on an oscilloscope, inserting a 4kHz low-pass filter (see Fig. 10-10). Insert a screwdriver into the grating hole, turn and find the null point (see Photo 10-1). Next

42、, slowly turn the screwdriver clockwise trom the null point and adjusi until the waveform (tracking error signal) reaches maximum amplitude (see Photo 10-3). Note: Use caution since inserting the screwdriver forcefully will cause the pickup unit to float upward. Finally, make sure that there is no m

43、ajor fluctuation in the p-p voltage of the tracking error signal (do not insert the cutoff 4kHz low-pass filter) when the pickup is shifted to the inner periphery and when the pickup is shifted to the outer periphery. If there is a difference of more than +10% again rotate the grating ad- justment s

44、crew and adjust the tracking error signal to maximum. 3 B 1 Step No. Oscilloscope Setting Test Points Adjusting Points Check items/ Adjustment specifications Adjustment procedure 5 Tracking balance adjustment 0.5V/div 5ms/div TP1 Pm 2 (TRK. ERR) VR5 TRK.BAL) Pholo 1-4 DC elements mixed in sianal 1 L

45、_ I Load the test disc. Put unit in the test mode (see page 30). Press the MANUAL SEARCH FWD to) Key to position the pickup near the center of the disc. Press the TRACK FWD tOl) and PLAY ( t ) keys sequentially to cause the disc to rotate. Observe TP1 pin 2 TRK.ERR (tracking errr) on the oscilloscop

46、e and adjust VR5 TRK.BAL(tracking balance) to eliminate the DC elements from the tracking error signal. A= B Ptioto 10-5 DC elements eliminated Tangential adjustment Base plate Ballast base Tangential adjustment SC rew Motor (Right side view) Tangential adjustment screw Fig.10-11 Put unit in the tes

47、t mode (see page 30). Open the tray and load the test disc. Press the MANUAL SEARCH FWD ( OO) key to position the pickup near the center of the disc. Insert a hex wrench into the tangential adjustment screw section from the rear of the mechanism. Close the tray. Note: Do not use an L-shaped hex wren

48、ch. Use one such as shown to the left. Using an L-shaped hex wrench can cause the tray to come loose (see page 33 4. Grating Adjustment (1). 3 PD-xee Step No. Oscilloscope Setting Test Points Adjusting Points Check items/ Adjustment specifications Adjustment procedure 200ns TP1 Pin 1 RF output Tangenlial adjustmenl screw Sharpest possible eye pattern Press the TRACK FWD (OCH), PLAY (o), and PAUSE ( G G ) ltl), PLAY ( t ), and PAUSE ( 00 ) keys sequentially to activate the focus, spindle, and tracking servos