Nakamichi-MB75-cd-sm 维修电路原理图.pdf

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1、RadioFans.CN 收音机爱 好者资料库RadioFans.CN 收音机爱 好者资料库P 1Improvements of 6 Disc & CD-700 / CD-700II MechanismP 21(i) Prevent CD Auto Eject: Shutter sensor is not activated properly (Loading Assy)Add PVC sheet (0.5 x 0.3 x 0.24mm) P#0C10606A at Shut Arm PlateP 31(ii) Prevent CD Auto Eject: Shutter sensor is

2、not activated properly (Loading Assy)Clear Burr at Shut Arm (P#0C20268B)P 4Cut Reinforcement board at Loading FPC Assy (Cut away 10mm)Remains 5mm2(i) Prevent E-mecha: bad solder joint due to insertion force at CN107 (Main PCB Assy)Resolder or replace CN107 for repairP 52(ii) Strengthen Loading FPC A

3、ssy (Loading Assy)Add Kapton tape at Loading FPC AssyP 6Press Plate PLS Sub Assy & make sure that shut arm cannot move3(i) Prevent E-mecha: loading CAM Mechanism jamming (Loading Assy)If it moves, check if the 3 teeth of the shut arm rack comes out when shut arm is in vertical position.If no, re-adj

4、ust the shut arm.P 73(ii) Prevent E-mecha: shut arm movement not smooth (Loading Assy)Change Shut Arm Spring (0C20427C) bond apply area Before Change P 83(iii) Prevent E-mecha: loading CAM Mechanism jamming (Loading Assy) (6 Disc Mechanism)Apply Super Glue in between Loading Plate R Sub Assy (CG1011

5、9C) & Photo Sensor Holder (0C20418C)P 94(i) Prevent E-mecha: clamper arm does not catch clamp plate (Clamper Assy)Apply hanarl on clamp Arm Sub Assy (CG10141D)P 10Apply hanarl on clamp Arm Sub Assy (CG10141D)4(ii) Prevent E-mecha: clamper arm does not catch clamp plate (Clamper Assy)P 114(iii) Preve

6、nt E-mecha: clamper arm does not catch clamp plate (Clamper Assy)Check Clamp Lock Spring (0C20439B) for bond apply area ( Less than half of the top part of the circle)NGOKCheck Clamp Lock Spring (0C20439B) for smoothnessP 124(iv) Prevent E-mecha: clamper arm does not catch clamp plate (Clamper Assy)

7、Change clamp arm sensor if the gap is too big.Keep minimum gap between Clamp Arm Sensor & Bracket during assemblyP 134(v) Prevent E-mecha: clamper arm does not catch clamp plate (Clamper Assy)Apply harnal on Clamp Plate & Clamp Arm Sub Assy P 144(vi) Prevent E-mecha: clamper arm does not catch clamp

8、 plate (Clamper Assy)Change to new Clamp PlateP/no.CG10180C (With circle Mark)P 154(vii) Prevent E-mecha: clamper arm does not catch clamp plate (Clamper Assy)Add Clamp Head P/no:0C10602A & Clamp Head Sheet P/n.0C10603A on top of Clamp PlateP 165(i) Prevent E-mecha: loading guides does not hold disc

9、 correctly when closed(Loading guide Assy)Check that Loading Guide L Sub Assy is able to move smoothlyP 175(ii) Prevent E-mecha: loading guides does not hold disc correctly when closed(Loading guide Assy)Apply Molykote PG-663 instead of KS-39M on Shaft x2 of Loading Plate STC Sub AssyP 185(iii) Prev

10、ent E-mecha: loading guides does not hold disc correctly when closed(Loading guide Assy)Change to new springP# 0C10605AP 195(iv) Prevent E-mecha: lower plate sub assy may touch to traverse vertical screw during disc change (Loading guide Assy)Change to modified spare partFile Lower Plate Sub Assy CG

11、10118A to 30% depth of thicknessP 206 Improve 8cm Disc Eject: 8cm Disc does not eject (Loading guide Assy)Change to new Spring bias P# 0C20257AP 217 Prevent E-mecha: loading guide R touches to lock guide top ( Loading Guide Assy)Change to new Loading Plate R Sub Assy P# CG10119CP 228 Prevent E-mecha

12、: loading guide jamming (Loading Guide Assy)Bend this angle up to more than 80Rack loading CAM Sub Assy touches to this gearP 239 Prevent E-mecha: eject jamming (Loading Guide Assy)Change to modified spare partCut Pre load Gear 0C20371B by 0.4mm (Inside loading guide Assy)P 2410(i) Prevent CD skip:

13、CD skip (Traverse Mecha Chassis Assy)Change traverse mecha chassis assy if pickup assy movesMove pickup assy. Check that pickup shaft can move in between drive shaft and thrust assy. Pickup assy must not move at the same timeP 2510(ii) Prevent CD skip: CD skip at low temperature (Traverse Mecha Chas

14、sis Assy) When fixing Pickup Feed Shaft into Drive Shaft Guide Assy, make sure the Pickup feed shaft must be straight10(iii) Prevent CD skip: CD skip at low temperature (Traverse Mecha Chassis Assy)Apply “Harnal” on the top & bottom of Traverse Mecha Sub Assy (pick up traverse area) P 26Check that p

15、ickup feed shaft must be straightApply harnal on Pick-up traverse area10(ii) & 10(iii) Prevent CD skip: CD skip at low temperature (Traverse Mecha Chassis Assy)P 2711 Prevent E-mecha: loading guide L touches to traverse mecha chassis assy (Traverse Mecha Chassis Assy)Change to new Traverse Mecha Cha

16、ssis Sub Assy P# CG10139DP 2812 Prevent E-mecha: Thrust ring comes out when traverse mechanism moves up & down (Traverse Mecha Chassis Assy)Replace Thrust Ring x3 pcs P# 0C20357A by LUMI CUT W3.2MM x6 P#0E04396A(Red color) (2 on each place)P 29Use a small round file to file 0.5mm1mm on the touching

17、area of Stocker FPC Assy 13 Prevent E-mecha: stocker FPC assy touches with loading roller guide assy (Loading Chassis Assy) (6 Disc mechanism only)Change to modified spare partP 3014(i) Prevent E-mecha: Gear damage (Feed motor Assy)(6 Disc mechanism only)Replaced with a new Feed Motor Assy(CA10102B)

18、 P 31Add Sony bond SC-12114(ii) Prevent E-mecha: Gear damage (Feed motor Assy)(6 Disc mechanism only)P 3215 Prevent E-mecha: clamper arm does not catch clamp plate (Clamper Assy) (6 Disc mechanism only)Apply hanarl on Clutch Arm Sub Assy gearsP 3316 Prevent E-mecha: loading guides does not hold disc

19、 correctly when closed(Loading guide Assy)Change to modified partDrill hole 3.5P 3417 Prevent CD cannot insert: Plate PLS Sub Assy touches to Front Base (Front Base Assy)Change to modified partBefore changeAfter change - Milling down of Front baseP 35SummaryMost of the improvements are in the Loading Assembly (Part # CA10105).Traverse Mecha Chassis Assy.Feed Motor AssyFront Base Assy