lexicon m300-300L_repair_procedure电路图.pdf

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1、3 Oak Park Bedford, MA 01730 Tel (781) 280-0300, Fax (781) 280-0499 email: M300 REPAIR PROCEDURE M300 Repair Procedure; REV 4.4 July 16, 2001 1 The purpose of this document is to assist authorized Lexicon Service technicians in repairing and updating returned units to current manufacturing standards

2、. This and its associated procedures are the factory repair standard and are recommended to authorized distributor service centers. This procedure is to be used in conjunction the product service manual, technical bulletins and with standard performance verification, troubleshooting and QC procedure

3、s. Some of the information contained herein may be proprietary in nature and should be treated by Lexicon and its representatives as such. Part 1. Mandatory repairs ALL RETURNS 1.Confirm complaint(s) and repair. 2. Clean all jacks with nonresidue spray. 3. Seat all components in sockets. 4. Inspect

4、for any cracked or otherwise damaged components. 5. Clean unit inside and out. 6.Check all cables as to condition and proper connection. 7.Check for all ECOs based on revision of PCBs. Incorporated as needed at time of repair. 8.ECO 910314-01 Check installation of R106 per ECO. 9.ECO 910410-02 ANALO

5、G BD, REV 1-4; Add two (2) daughter boards to the Analog Bd, to correct differential output line driver signal balance ratio. ONLY if customer registers a complaint. 10.ECO 911205-00 AES INTERFACE BD Rev 1 - Release V1.10 firmware to implement fix for slave recovery from missing or intermittent exte

6、rnal digital input (external clock). - Change gain on RCA SPDIF digital input receiver to improve noise immunity to corrupt signals received through RCS SPDIF 1/P. 11.ECO 911210-00 Front Panel, change the RUN button to read SETUP SELECT to avoid confusion by the user. Marketing requested modificatio

7、n. 12.ECO 920117-01 ANALOG MAIN BD, Rev 4, check for removal of OP signal ground per ECO. 13.ECO 901227-00 Add RTV to add support to battery to prevent from breaking in the field on HOST Bd. 14.ECO 921118-00 Install Version 1.11 at time of repair or when customer calls call with a problem of recordi

8、ng through the digital interface. This is bug in version 1.10 only. 15.ECO 930616-01 PS Heatsink Assembly - add washers (2 - lock split #6, P/N 644-01740) to +5V digital regulator mounting (torque 6-8 in/lbs). 16.ECO 931203-00 V3.50 UPGRADE - all Consigment, New and R/E Stock; CUSTOMER UNITS ONLY IF

9、 PURCHASED! IF CUSTOMER UNIT HAS V3.? (OTHER THAN 3.5) INSTALL V3.5! 17.ECO940105-00 Corrects layout - BAT1 positive terminal too close to a via carrying D2 signal. New Rev-7 PCB. All Rev 6 boards should be inspected and reworked: using needle nose pliers, carefully bend positive terminal lead away

10、from circuit via. Shock Test failures resulting in BUSS ERROR have been encountered. 18.ECO940411-00 Changes AES termination - AES Bd: Delete 202-07779 1/2W 240ohm resistor at R7 and Add 202-08190 1/4W 110ohm RadioFans.CN 收音机爱 好者资料库 3 Oak Park Bedford, MA 01730 Tel (781) 280-0300, Fax (781) 280-0499

11、 email: M300 REPAIR PROCEDURE M300 Repair Procedure; REV 4.4 July 16, 2001 2 Part 2. Optional repairs AS NEEDED 1. ECO 930412-00 Change resistor R7 on PS Bd from 3k ohm (202-00537) to 4.99k ohm (203-00464) change pfail circuit so pfail/ happens before +5v starts losing regulation. 2. ECO 930426-00 A

12、nalog Bd, all Revs. Change resistors at locations R57 and R82 from470k ohm (202-00579) to 200k ohm (202-00576) to provide more offset adjust range on calibration of PCM56 3. ECO 971218-00 USE LEXICHIP 2A ONLY IN M300/L. NEW PART NUMBER CREATED, 330-12589 4. ECO 990402-00 Obsolete part replacement; L

13、exicon P/N 430-02285 LED,RED,.118DIA; Locations: Host Bd. D2, 3 MFR P/N PR39325 - Stanley: obsolete. Use Lexicon P/N 430-13706 LED,RED,.118 DIA,3MCD Note: any existing Lexicon stock of P/N 430-02285 reserved for use on M41, M42 and M2400 service. 5. ECO 990401-00 The following Manufacturer has been

14、deleted from the approved vendor list for Lexicon P/N 355-07542 DAC,AD7628,CMOS,2X8BIT,MDAC: Maxim MX7628KN. Note: the Maxim part does not always work in the M300 REV 4.4 July 16, 2001 3 7. 970418-02 Alps encoder, Lexicon P/N 452-04233 SW,RTY,INC ENCODER,50 POS discontinued. Replace with P/N 452-097

15、62 SW,RTY,ENCODER,36 POS,VERT MNT (Noble part). ? ECO980417-00 Replace discontinued Motorola part MC68008, P/N 365- 04594 with 024-12910 ADPTR BD,ASSY,68008 Note: for spare parts sales, 023-12909 ADPTR BD,PRE-TEST,68008. Use existing stock of P/N 365- 04594 for repair of older M300/M480L. . Replacem

16、ent has not been tested in older revs but may work. Part 4. Engineering change orders 1. 890707-00 Sub panel front change cable slot size. 2. 890724-00 Add keyboard support 702-07474. 3. 890824-01 Delete 641-06758 add 640-08061 hardware cost reduce 4. 890828-00 550-07573 changes so to fit PCM-x as w

17、ell 5. 890831-00 FP Add U19,SW32 (BOM errors) 6. 890922-00 Bom change delete mem x2 add 1 meg mem x2 7. 890928-00 Demensions front panel 8. 890928-01 Drill dwg aes brd 9. 891006-00 Drill dwg host brd 10. 891011-00 Mechanical drawing changes knob, cover, bracket, support, front panel drill out feedth

18、rough, 3 Cuts, 4 Jumper. Does not apply to repairs, manufacturing only. 15. 891117-01 ANALOG Rev. 1 Remove jumper wire W1 2-3, etch cut. 16. 891117-02 DSP Rev. 1 Drill swage holes to .187, add kapton tape U50, add R23 75 ohm R1,3,16,8,9,11,14,16. PC board relocate Q1-4. 19. 891120-00 FP Rev. 1 Move

19、components. 20. 891121-00 Power Supply change 440-07783 1/16AMP from fast-blow to slo- blo. 21. 891129-00 Change screw tap soft knob 22. 891201-00 Mechanical spec changes 23. 891204-00 ANALOG Rev. 1 correct schematic ferrite beads. 24. 891207-00 Revise B.O.Ms Analog REV 4.4 July 16, 2001 4 29. 90011

20、8-02 Power Supply Rev.1 Prevent premature fuse blowing. Change .25A to .5A, C8 from 47uf to 220uf. 30. 900118-02-A Correct error with F2. 31. 900207-00 Change front panel finish. (all should be same) 32. 900215-00 Analog Brd. Socket MDACs U2,8,11,15. (20 pilots not done)3 33. 900516-00 Update graphi

21、cs FP REV 4.4 July 16, 2001 5 55.900529-00 Add service option package. 900529-00-A To correct errors in original ECO. 56.900619-00 Allow use of M300 bottom cover on CP-3. 57.900621-00 Label to comply with VDE standards. 58.900702-00 Change U24 Mem-decode GAL to accommodate 1 megabit ROMs in ROM1 loc

22、ation (U22). 59.900705-00 Change encoder, soft knob and sub front panel after initial stock is depleted. 59A.900705-00-A Allow deviation from BOM for FP assembly to use Rev 3 Processor Bds #710-07458, with Rev 2 FP Switch Bds #710-07498. 59B.900705-00-B To correct the version number displayed on pow

23、er up from V1.00 to V2.00. 60.900713-00 Correct BOM for R9 REV 4.4 July 16, 2001 6 81A.910201-00-A Delete washer Stk # 644-06347. 82.910207-00 Correct mechanical design errors for the manufacturing process. 83.910227-00 Fix bottom cover fit, replace spacer part # 630-07548 with part # 630-07546. 84.

24、910314-01 ECO shows the proper installation of R106. 85.910315-00 Updates drawing of DSP Board. 86.910315-01 Update drawing for AES board. 87.910410-02 ANALOG BD, Rev 1-4; Add two (2) daughter boards to the Analog Bd, to correct differential output line driver signal balance ratio. 88.910530-00Chang

25、e screw length for mounting bracket from 10-32X5/16 to 10-32X3/8, FH, PH; Stk # 640-08874. 89.910613-00 FP screw to short, delete 641-08796 add 641-09004. 90.911024-01 To change DC offset removal cap in output driver Circuit to meet unblaanced frequency response test spec of +/- 0.2db 10Hz. On Analo

26、g Daughter Bd for rev 1-3 Analog bd; and Analog bd rev 4. Change capacitor value from 10uf to 47 uf. 91.911127-00 Remove Optical cables from ship kit. The are no longer provided with the unit. 94.911125-00 ANALOG Bd Rev 4 and Daughter Bd Rev 0, add power supply caps to the 2442 O/P driver on the Ana

27、log Daughter bd; add addition power supply bypass caps to 2142 O/P driver on the Analog Bd to improve stability. Revise Analog Bd rev 4 to improve PCB layout of U10,14 bypass caps. This change is on production boards, none have made is to the field. 94A.911125-00AANALOG BD, Rev 4, (Rev 1-3 WITH DAUG

28、HTER BD); To correct component manufacturing and design errors. 94B.911125-00BAnalog Bd Rev3, on ECO 911125-00A the wrong capacitor was called out. Delete part #(245-00590) on all references. Replace with part # (245- 03870) Cer Cap 150pf, 100volt . 95.911205-00AES INTERFACE BD Rev 1 - Release V1.10

29、 firmware to implement fix for slave recovery from missing or intermittent external digital input (external clock). - Change gain on RCA SPDIF digital input receiver to improve noise immunity to corrupt signals received through RCS SPDIF 1/P. 96.911210-00 Front Panel, change the RUN button to read S

30、ETUP SELECT to avoid confusion by the user. Marketing requested modification. 97.920117-01ANALOG BD, Rev 4, remove left and right O/P ground from signal ground to leliminate possible ground loops. There is no product in the field. 98.920211-00Chassis add ground indicator labels as identified in the

31、ECO for UL1419 Add missing C11 and J2 nomenclature to board. 3 Oak Park Bedford, MA 01730 Tel (781) 280-0300, Fax (781) 280-0499 email: M300 REPAIR PROCEDURE M300 Repair Procedure; REV 4.4 July 16, 2001 7 102.921118-00Release Version 1.11 install for customer sevice only to repair a bug which causes

32、 incorrect channel status to be trainsmitted when the M300 is running from the internal crystal mode. With version 1.10 installed customer can have a problem recording through the digital interface when recording to DAT machine, with the M300 0n internal crystal.this bug is not present in Version 1.

33、02 . 103. 931203-00 V3.50 Upgrade- All Consignment, New and R/E Stock; CUSTOMER UNITS ONLY IF PURCHASED! IF CUSTOMER UNIT HAS V3.?( OTHER THAN 3.5 ) INSTALL V3.5! 104.930412-00 Change resistor R7 on PS Bd, from 3kohm ( 202-00537 ) to 4.99kohm ( 203-00464 ).change pfail circuit so pfail / happens bef

34、ore +5v starts losing regulation 105.930426-00ANALOG BD all Revs, Change resistors at locations R57 and R82 from 470kohm ( 202-00579 ) to 200kohm ( 202-00567 ) to provide more offset adjust range on calibration of PCM 56. 106.930422-00/00-AV3.00 Software Upgrade 107.930616-01PS Heatsink Assy add was

35、hers ( 2- split lock #6 , P/N 644-1740 ) to+5V digital regulator mounting ( torque 6-8 in / lb) 108.940105-00Correct layout- Bat1 positive terminal too close to via carrying D2 signal. New Rev-7 PCB. All Rev 6 bds should be inspected and reworked : using needle nose pliers, carefully bend positive t

36、erminal lead away from circuit via. Shock Test resulting in BUSS ERROR have been encountered. 109.940411-00Changes AES termination- AES bd Delete ( 202-07779 ) 1/2W 240 ohm resistor at R7 and add ( 202-08190 ) 1/4 W 110 ohm. 110.950427-00Incorporate new M300 / L Power supply board into M300 product,

37、 and remove unnecessary Front Panel Supply circuitry from M300L power supply board Bom. 111.950428-00Incorporate New M300L DSP bd into M300 product so that both share common assembly. 112.950713-02To correct the AES output impedance ( increase to 100 ohm ). To also correct the Analog Input-Analog Ou

38、tput phase ( theyre 180 degrees out of phase ). 113.ECO 990402-00 Obsolete part replacement; Lexicon P/N 430-02285 LED,RED,.118DIA; Locations: Host Bd. D2, 3 MFR P/N PR39325 - Stanley: obsolete. Use Lexicon P/N 430-13706 LED,RED,.118 DIA, END OF ECOS. 3 Oak Park Bedford, MA 01730 Tel (781) 280-0300,

39、 Fax (781) 280-0499 email: M300 REPAIR PROCEDURE M300 Repair Procedure; REV 4.4 July 16, 2001 8 Part 5.Quick Reference ECOs ANALOG BOARD 1. 891117-01 ANALOG Rev. 1 Remove jumper wire W1 2-3, etch cut. 2. 891204-00 ANALOG Rev. 1 correct schematic ferrite beads. 3. 900215-00 ANALOG Brd. Socket MDACs U

40、2,8,11,15. (20 pilots not done) 3A.911125-00AANALOG BD, Rev 4, (Rev 1-3 WITH DAUGHTER BD); To add high frequnecy shunt caps to PMI 2142 O/P drivers. To correct component manufacturing and design errors. 4.910410-02 ANALOG BD, Rev 1-4; Add two (2) daughter boards to the Analog Bd, to correct differen

41、tial output line driver signal balance ratio. 5.911024-01 To change DC offset removal cap in output driver Circuit to meet unblaanced frequency response test spec of +/- 0.2db 10Hz. On Analog Daughter Bd for rev 1-3 Analog bd; and Analog bd rev 4. Change capacitor value from 10uf to 47 uf. 6.911125-

42、00 ANALOG Bd Rev 4 and Daughter Bd Rev 0, add power supply caps to the 2442 O/P driver on the Analog Daughter bd; add addition power supply bypass caps to 2142 O/P driver on the Analog Bd to improve stability. Revise Analog Bd rev 4 to improve PCB layout of U10,14 bypass caps. This change is on prod

43、uction boards, none have made is to the field. 6A.911125-00AANALOG BD, Rev 4, (Rev 1-3 WITH DAUGHTER BD); To add high frequnecy shunt caps to PMI 2142 O/P drivers. To correct component manufacturing and design errors. 6B.911125-00BAnalog Bd Rev 3 , on ECO 911125- A the wrong capacitor was called out

44、. Delete part(245-00590) on all references. Replace with part (245- 03870) 150pf cer cap. 7.920117-01ANALOG BD, Rev 4, remove left and right O/P ground from signal ground to leliminate possible ground loops. There is no product in the field. 8.930426-00 ANALOG BD, all Revs, Change resistors at locat

45、ions R57 and R82 from 470k(202-00579) to 200k (202-00576) to provide more offset adjust range on calibration of PCM56. 3 Oak Park Bedford, MA 01730 Tel (781) 280-0300, Fax (781) 280-0499 email: M300 REPAIR PROCEDURE M300 Repair Procedure; REV 4.4 July 16, 2001 9 Quick Reference ECOs cont. FRONT PANE

46、L ASSEMBLY 1. 890831-00 FP Add U19,SW32 (BOM errors) 2. 891011-00 Mechanical drawing changes knob, cover, bracket, support, front panel REV 4.4 July 16, 2001 10 Quick Reference ECOs cont. HOST BOARD 1. 891117-00HOST Rev.1, drill out feedthrough, 3 Cuts, 4 Jumper. 2. 900118-01HOST Rev.1,2 (wires REV

47、4.4 July 16, 2001 11 Quick Reference ECOs cont. DSP BOARD 1. 891117-02 DSP Rev. 1 Drill swage holes to .187, add kapton tape U50, add R23 75 ohm REV 4.4 July 16, 2001 12 SUBJECT: M300 ANALOG BOARD, REV 4 REFERENCE: ECO 920117-01 PURPOSE: Remove left and right O/P ground etch from signal ground to el

48、iminate possible ground loops. CORRECTIVE ACTION: All Rev 4 boards were ECOd prior to shipment. It is only necessary to verify the ECO has been performed in the event of ground loop complaints or suspicions. WARNING This modification should be performed by qualified technical personnel only. Damage

49、caused by performing this modification may void the manufacturers warranty or standard repair policies. CAUTION Electrostatic Discharge (ESD) Precautions The following practices minimize possible damage to ICs resulting from electrostatic discharge or improper insertion. Keep parts in original containers until ready for use. Avoid having plastic, vinyl or styrofoam in the work area. Wear a properly installed anti-static wrist-strap. Discharge personal static before handling devices. Remove and insert boards with care. When removing boards, handle only by non-co