Akai-CDM512-cd-sm 电路图 维修手册.pdf

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1、3-2. REPLACEMENT OF THE PICK UP BLOCK PRECAUTION BEFORE REMOVING THE PICK UP BLOCK When disconnecting or connecting the connectors PI and P2, make sure that the P.C board (on the PICK UP BLOCK) has been short circuited as shown in Fig. 3-2. Do not turn the electricity ON while the P.C board is short

2、 circuited. O Short by solder O Fig. 3-2 1) Disconnect the connectors P1 and P2 on the PICK UP BLOCK. 2) Push the (i part of the piek up block SLIDE SHAFT and pull it in the arrowed direction to remove the PICK UP BLOCK. 3) Reassemble in reverse order. RCK UP BLOCK 3-3. REPLACEMENT OF THE SPINDLE MO

3、TOR 1) Turn the GEAR HOLDER LEVER counter-clockwise (Fig. 3-4), then pull out the SLIDE GEAR. 2) Keep the PICK UP BLOCK away trom the SPINDLE MOTOR (f direction as shown in Fig. 3-5). 3) Remove the two SPINDLE MOTOR fixation screws through the hole on the TURN TABLE (Fig. 3-5), then remove the SPIND

4、LE MOTOR. 4) Reassemble in reverse order. LOADING MOTOR SLIDE GEAR Fig. 3-4 PICK-UP BLOCK VIEW FROM UPPER SIDE TURN TABLE Fig. 3-3 ,;.SCREW SCREW TURN TABLE Fig. 3-5 3-4. REPLACEMENT OF THE LOADING MOTOR 1) Remove the LOADING BELT, then remove the LOAD- ING MOTOR while releasing the hooks (Fig. 3-4)

5、. 2) To reassemble, push in the LOADING MOTOR and re- place the LOADING BELT. 3-5. REPLACEMENT OF THE SLIDE MOTOR 1) Turn the d SLIDE MOTOR HOLD LEVER (Fig. 3-4) clockwise, then pull out the SLIDE MOTOR. 2) Reassemble in reverse order. SERVICE MANUAL 6 RadioFans.CN 收音机爱 好者资料库 V . R E P L A C E M E N

6、 T O F S P I N D L E M O T O R 5-1. REMOVE AND ASSEMBLY SPINDLE ADAPTOR SPRING ADAPTOR SPINDLE MOTOR 1) Pull out the turntable. Spring adapter and Adapter. 2) Remove two Screws. 3) Unselder two Spindle Motor wires. 4) Solder two wires te the new Spindle Motor. 5) Put the new spindle Motor on the cha

7、ssis with two screws. 6) Press-in the turn table en to the Motor shaft. Adjust the turntable so that the hight of the turntable from chassis become 6.6 0.1 mm (Fig. 5-2). I 0 t 6.6+0,1 Fig. 5-2 Fig. 5-1 VI. HOW TO INSTALL OF THE LOADING MECHANISM 1. Set the Disc Tray in a loading conditin. 2. Set th

8、e gear(B) on the shaft (G). When the gear (B) is set properly, fit the Hole of the gear (B) te the hele of the CHASSIS. (Fig. 6-1) 3. Press the Lever-outsert to fuUy direction (D). (Fig. 6-1) 4. Set the gear (C) on the shaft (H). When the gear (C) is set properly, fit the MARK (E) to the MARK (F). (

9、Fig. 6-1) 5. Set the gear (A) en the shaft (I). When the gear (A) is set properly, fit the Hole of the gear (A) to the Hele of the CHASSIS. (Fig. 6-1) L E V E R OUTSERT - G E A R ( B ) HOLE Mg. 6-1 -SERVICE MANUAL- RadioFans.CN 收音机爱 好者资料库 V I I . A D J U S T M E N T 7-1. ADJUSTMENT WHEN CHANGING THE

10、 PICK-UP 7-1-1. Pick-up Inclination Adjustment Fine inclination adjustment in the jitter direction is necessary after replacing the pick-up. Adjustment is performed by rotating the Jitter Direction Inclination Adjustment Screw. (Fig. 7-1) 1) Connect the oscilloscope between J202 pin(3)(HF signal) an

11、d GND. 2) Set the unit in the |TEST MODE 4 NOTE: How to make test Mode has been written in the Servo Adjustment Procedure. 3) Press the (FF)/(RF) Buttons so that the Jitter Direc- tion Adjustment Screw may situate to the middle of the Inclination Adjustment Hole. (Fig. 1-1) 4) Confirm that the HF si

12、gnal (Eye-Pattern) shown in Fig. 7-2. 5) Turn right and left the Jitter Direction Adjustment Screw (Fig. 7-1) with the hexagonal driver (2.4 mm) until the HF Signal pattern change from (A) to (B) in Fig. 7-3. 6) After adjustment confirm that the HF signal level is within the range indicated below. C

13、heck that the HF signal pattern is clear as shown in Fig. 7-3 rBl. Jitter Direction Inclination Adjustment Screw Fig. 7-1 2Q0ir.V SOOnS Peaks in this area must become flat Minimize distortion of the signal itself 2 4 +-Sv -I.P (A) : HF Signal before jitter direction adjustment (B) : HF Signal after

14、jitter direction adjustment Fig. 7-3 Fig. 7-2 RadioFans.CN 收音机爱 好者资料库 7-1-2. Optical Axis Adjustment If the meclianical eccentricity is iarge when fixing the pick-up tracking errors become Iarge. This is turn interferres with the tracking servo, so optical axis adjustment is necessary. 1) Set tlie u

15、nit in |TEST MODE 3 2) Press tlie (FF)/(RF) Button so that the optical axis adjustment screw situate to the middle of the optical axis adjustment hall. (Fig. 1-1, Fig. 6-1) 3) Connect the oscilloscope between J202 pin (2) and GND. 4) Adjust the optical axis adjustment screw so that T . E (Truck Erro

16、r) signal becomes maximum. (Fig. 7-4) 7-1-3. Readjustment of E-F Balance When the pick-up is changed. E-F balance adjustment must be performd. Refer to 7-2 Servo adjustment. 7-14. APC (Automatic Power Control) Circuity This is a servo circuit to maintain the L D (Laser Diode) power of the pick-up. T

17、he L D power can be adjusted by the V R l by the pick-up block. However appropriate adjustment for individual characteristics has already been made so, DO NOT touch this. NOTE: It is required to adjust Servo control circuit when pick-up is replaced. Adjust the circuit according to the (7-2) Servo adjustment. Fig. 7-4 8 SERVICE MANUAL