lexicon 480L_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: Sales Administration, Spares, Product REV 5.2 08/29/00 1 The purpose of this document is to assist authorized Lexicon Service technicians in repairing and updating returned units to current manufacturing standards. This and i

2、ts 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 procedures. Some of t

3、he 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 (see Part 3, Troubleshooting Notes). 2. Clean unit as reqired including all rotary pots and jacks wit

4、h no-residue cleaner. 3. Seat all components firmly into sockets. 4. Inspect insulation displacement for proper connection (reseat wires if needed) 5. Reseat all cables. 6. E.C.O. 860703-00 A POWER SUPPLY change R13 to 202-00501 150ohm, R6 to 203-02655 6.04K, and C5 to 245-03610 .01uf. (s/n 1008-101

5、8,1021 only) 7. Vacuum the entire unit and clean air filter. 8. Change R239 MOTHERBOARD A to 220 ohm 202-00518. E.C.O. 860902-00 (speed up mute) (s/n 1000-1090 only) (effective s/n 1091) 9. Remove VERTEX label on host board and place a paper label under it. If VERTEX label will not hold use adhesive

6、. 10. Upgrade to V1.23. Parts charged to 451-11. See upgrade instructions. 11. Trim jumpers 1, 2 REV 5. 2 08/29/00 2 16. Check Host boards to make sure 4538 installed. Works properly on power up and power fail reset. (they caused intermittent power up U45 rev.1 U36 rev.3) 17. E.C.O 871026-00 Host Re

7、v.3 and up. Change 350-05801 peak pal to V1.10 to correct intermittent headroom indication without input. (effective s/n 1498) sent 57 pals to GEXCO domestic will be as needed. 18. 880120-00 SME Cut 5 etch, add 5 jumpers. (all boards shipped prior to eco to be exchanged, approximately 24) (s/n 1009-

8、1026, 1029-1032, 1034, 1038,1041, 1044-1046 were shipped without E.C.O. 19. 881215-01 HOST Rev.1 and up. Add jumper between cathode VR1 Correct marginal timing in DMAREQ reset circuitry which contributes to intermittent muting during program loads and MIX paramter updates. Delete Stk # 330-04567, IC

9、 74HCT32, U25 and add Stk# 330-07599 IC 74AC32, U25. 29.ECO 920311-01 SME Bd, Rev 2 To eliminate the occasional WC Timeout error during diagnostic testing. Install a jumper from U3, pin 10 to U3, pin 16. 30.ECO 920521-00 HOST Bd, Rev 3-8;Change R21 from Stk # 203-00488 to 13.3K , Stk #203-02701; To

10、improve power up reset circuitry. 31.ECO 921211-00 HOST Bd, Rev 3-8; Change U25 from 74AC32, (Stk 330-07599) to 74ALS32 (Stk 330-09643), Add R66, 220 ohm, (Stk 202-00518). This to reduce reflections on Ramcasel/signal to generate a more reliable chip enable for the Host Bd RAM cart Data and address

11、buffers as well as the RAM/ROM cart itself. Part 2. Optional repairs AS NEEDED RadioFans.CN 收音机爱 好者资料库 M480L/LARES REPAIR PROCEDURE 480L Repair Procedure; REV 5. 2 08/29/00 3 1. Any of the E.C.O.s listed in part 4 may be done if a unit is not meeting specification. 2. Motherboard - C Improve high le

12、vel output performance of hybrid. E.C.O. 861015-00 Add 8 caps to hybrid 5200 C229-236 33pf 245-03868 (effective s/n 1149) 3. Improve 20kHz THD E.C.O. 870317-00 Delete C64, C69, C74, C79; remove pins 5 UPDATE all LEXICON OWNED Cons, New Stock; UPDATE R/E Stock only if V4 Part Number; UPDATE Customer

13、units only if V4 Upgrade purchased or V4.00 already installed 8.DW940610-00: Can substitute 74HC245 (330-08952) U87 on SME (024-05830) for 74HCT245 (330-04572). Driven from HCT on HOST so HC is OK. Reason: Diagnostic failures of DMA Test (board functions). Qty covered by DW is 15 on WP 480-6150 and

14、any service requirements. 9. 950509-00 V4.10 Software release to correct bugs in the Midi sampler trigger from a note, and program loading problem interrupt change Dual mono audio problem A to B lead some fuzz in the Cascade mode. 10. If you have an M480L that is failing intermittently, check for th

15、e Rev level of the Host board. If the Host board is Rev 10, using a DVM meter set for measuring continuity, check the + 5 volt / VCC connections on several ICs and Bypass capacitors various points around the board. Install wire jumpers for any opens found. 11. Problem: There have been complaints fro

16、m a few customers about the fan in the M480L and LARES being noisy. The fan was changed in the product when the original fan became unavailable. This new fan is somewhat noisier than the original fan. LARES installations are somewhat more susceptible to this being a real problem because the main fra

17、me may be located in an area affected by noise, where most M480L mainframe installations are in machine rooms where noise is not an issue. Solution: An ECO (970707-00) has been released to add a new FAN ASSY to the LARES production BOM. The ECO will be effective approx. 3/98 due to part lead times.

18、The ECO also allows for the installation of the FAN ASSY for service replacements of M480L with a complaint of fan noise. It is important to confirm the cause of fan noise complaints, i.e. is the fan defective or is the fan operating properly but unacceptably noisy due to installation environment. T

19、he FAN ASSY is available as a service option. LARES units returned for repair should have the FAN ASSY updated. We will install it in M480L units returned for repair with legitimate noisy fan complaints. We can sell the FAN ASSY RadioFans.CN 收音机爱 好者资料库 M480L/LARES REPAIR PROCEDURE 480L Repair Proced

20、ure; REV 5. 2 08/29/00 4 as a service option, price TBD, P/N 024-12587. A service bulletin will not be issued, the option includes installation instructions. LARES customers with noisy fan complaints should be referred to LARES ASSOCIATES. 12. ECO000808-00; new part number for location U51, HSP; cer

21、tain manufacturers of IC,DIGITAL,74HCT04 have caused failures at location U51; a new P/N has been created to be used in U51 location only for replacements and new builds. New builds starting with HSP SN: 10834 ? Del: 330-04260 IC,DIGITAL,74HCT04 ? Add: 330-14635 IC,DIGITAL,74HCT04 (SELECT); note: T.

22、I. part CD74HCT04E only; no substitutions M480L/LARES REPAIR PROCEDURE 480L Repair Procedure; REV 5. 2 08/29/00 5 Part 3. Troubleshooting notes - Always check battery on suspect host problems. - Polypro capacitors are problem parts which is due to their construction.They areweak and become intermitt

23、ent. - Refer to production testing procedures or service manual for current specifications and methods of test. - Refer to current software descriptions in owners manual for use of unit. - 1610 interface can only be tested with twisted pair RS422 cable. - Some early units had the foldback set at 10

24、amps. (now all 8.5amps) - First Rev.2 HSP is 2-1241 A in mainframe 480-1119. - First Rev.2 Motherboard B is in mainframe 480-1119. - The first 20 units shipped had a HOST board swap to V1.10 plus hardware changes. - 365-04284 Z80 4MHz CMOS Toshiba were found in test which fail diagnostics only. Work

25、 fine in all systems. - 860403-01 Ulveco power xformers with color changes on wires shrink tube (effected s/n 1000-1149) - 860826-02 Shorten wire RFI gnd. (effective s/n 1149) - Check sockets for broken pins (refer to Texas Instruments C89 bulletin) - 880516-02 HSP rev.2 (select part) U45 can not be

26、 Radiation Semiconductor, use Samsung 74HCT32 330-04567. - On some difficult digital problems try changing U9 on Host to LS04. - There was 31 Rev.2 Host boards built. 1-1802 - 1-1806, 1-1809, 1-1810, 1-1817-1-1840. - Host Rev. 4 27256-20C date code 8615YP can cause mainframe link fail or intermitten

27、t ram fail due to A15 floating. If A15 is jumpered to +5 it will work reliably. - Production found LF412 U67 bad for noise and were removed from spec sheet per ECO 890516-00. - 920120-00A Motherboard Rev 3 proto type serial # M- 3602 and C15 UPDATE all LEXICON OWNED Cons, New Stock; UPDATE R/E Stock

28、 only if V4 Part Number; UPDATE Customer units only if V4 Upgrade purchased or V4.00 already installed; PRODUCTION SERIAL NUMBERS REWORKED TO V4.01: 4017, 4095, 4099, 4107, 4113-4115, 4118, 4119, 4125. M480L/LARES REPAIR PROCEDURE 480L Repair Procedure; REV 5. 2 08/29/00 6 ? DW940729-00 - Murata fil

29、ter unspecd part used qty 170 for 380-04512 ? 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. Replacement ha

30、s not been tested in older revs but may work. ? DW990913-00: temporary replacement of LED at CR31; replace P/N 430- 04862 with 430-07325 on 60 units serial numbers 5681-5741 ? DW991213-00: HSP MMU, P/N 330-03766; waive test parameter from VDD 5.4V to 5.3V for better yield on test results from Univer

31、sal Semiconductor Part 4. Engineering change orders 1. 860129-00 Use 11mm knob 2. 860204-00 Cost reduce mechanical package 3. 880218-00 Power supply add spacer. 4. 860220-00 Host errors Rev 0 5. 860220-01 HSP errors rev 1 6. 860220-02 Revise cable to ram cart 7. 860221-00 Correct cage kit 8. 860221-

32、01 Correct finish kit 9. 860227-00 Etch cut and jumpers motherbrd Rev 1 10. 860305-00 HSP correct E.C.O. 860220-01 11. 860306-00 Chassis error overlay 12. 860306-01 Host Rev 0 move wires to component side 13. 860307-01 Power supply change CR5 to Z5.6 1% 14. 860320-00 Host error silk-screen 15. 86032

33、4-00 HSP use 15MHz version ARU and change poprivet 16. 860324-01 Host change pop rivet 17. 860326-00 Host Rev 0 add 1610 board 18. 860326-00-A Correct E.C.O. 860326-00 19. 860328-00 Host add label VRTX 20. 860402-00 Host Rev 0 etch cuts, wires and add resistor 21. 860402-01 HSP etch cuts and wires 2

34、2. 860402-00-A Host Rev 0 correct E.C.O. 860402-00 23. 860403-00 Motherbrd. resistor changes level change 24. 860403-01 Ulveco power xformers with color changes on wires shrink tube (effected s/n 1000-1149) 25. 860417-00 Motherbrd. add .01uf C221 26. 860417-01 Correct cage hardware 27. 860421-00 Hos

35、t Rev 1 28. 860425-00 Power supply change Q1 to RCA, change washers brittle in stock, add thermal grease, torque 6-8 in-lbs, change C2 to .1uf, make quick disconnect wires. 29. 860508-00 Host Rev 0 REV 5. 2 08/29/00 7 30. 860508-01 Host Rev 0 REV 5. 2 08/29/00 8 went out. Version 1.23 was released e

36、ffective s/n 1196. 195 updates were shipped to dealers. 61. 861104-00-B Version 1.23 release 62. 861104-00-C document change for V1.23 63. 861126-00 Change paint spec textured (effective s/n 1210) 64. 870119-00 Larc display sticks x8 change to x4 per stick new part number 430-04985 need two for repl

37、acement. 65. 870219-02 Interface adapter hole specs. 66. 870213-00 Front panel basket weld four corners 700-04393 (effective s/n 1271) 67. 870218-00 Chassis change retainer strap 702-04520, covers 700-04395, transformer C bracket 701-04990. (to improve structural integrity) (effective s/n 1271 on an

38、d 1182 was also done Note: strap was effective s/n 1237 68. 870218-00-A Chassis add 644-04527 washer, 644-05802 washer and increase 640-04691 to 3 1/4 in. (effective s/n 1271) 69. 870219-01 Interface adapter add 750-04978 (update documents) D 70. 870317-00 Delete C64, C69, C74, C79; remove pins 5 RE

39、V 5. 2 08/29/00 9 86. 870908-00 Host Add pull up resistor AS/ to correct power up. Remove Rev.3 pull down resistor on ZCLK. Rev 1 = add 10K 202-00549 from pin 11 U22 C to C19 (+5vdc). Rev.3 = add 10K 202-00549 from pin 11 U20 to C18 (+5vdc). On rev.1 only remove R62 pull down from U44.7 to feedthrou

40、gh. (effective s/n 1439) C 87. 871009-00-A SME add socket U177. 88. 871026-00 HOST change peak pal to V1.10 (effected s/ns are 1388-1497) 89. 871123-00 SME delete 4 jumpers W10,11,16,17. (ID code) 90. 871203-00 HOST V2.00 update four Roms, four new part #s due to the continuing of V1.23 software. (t

41、he V2.00 is for SME and V2.00 update). 91. 871228-00 HSP Change U45 to 330-04567 74HCT32 (was F32) (effective s/n 1550 C ) 92. 880120-00 SME Cut 5 etch, add 5 jumpers. (all boards shipped prior to ECO to be exchanged, approximately 24) 93. 880128-00 HSP rev.3 create rev.3 HSP effective s/n 1791 HSP

42、D (HSPs rev.3= 2-2549-2552, 2-2564, 2565, and then 2-2590 on) 94. 880513-01 HOST 8 jumpers, 3 etch cuts Rev.2 boards (31 boards built labeled Rev.2. effective s/n 1753-1783 31 Rev.2 Host boards built. 1-1802 - 1-1806, 1-1809, 1-1810, 1-1817 -1-1840. 95. 880516-02 HSP rev.2 (select part) U45 can not

43、be Radiation Semiconductor, use Samsung 74HCT32 330-04567. 96. 880524-02 System diagnostics introduce V1.00 SME diagnostic cartridge. (replace all 750-06219 with 750-06220) 97. 880922-01 Correct drawing to match new moulded cables. 98. 880923-03 Diagnostic cart rev. to V1.01. 99. 881109-00 Host rev.

44、4 nomenclature. 100. 881215-01 HOST Rev.1 and up. Add jumper between cathode VR1 REV 5. 2 08/29/00 10 107. 890627-00 MOTHERBOARD change R33 to 1.2k 202-00530 widen range of PF/ calibration. effective s/n 2365 - 108. 890712-00 Add Lexicon Digital Audio sticker to shipment. 109. 891128-00 350-04710, 4

45、3256 150ns replaced by 350- 05841 43256 100ns. Can use either speed. 110. 900104-00 Add LOCTITE #609 to screw threads of jacksocket 527-00138. 111. 900116-00 Add message to owners manual Caution: Do not remove or install the nonvolitile memory cartridge while power is applied to the 480L. 112. 90040

46、6-04 Ship kit Delete 680-04734 10 RS-422 cable, add 070-08378 notice which offers cable at no charge to users who would like. 113. 900411-00 Program Cartridge Add (2)740-03170, (1)740-08379 caution labels. 114. 900411-01 HOST Rev. 4 Only Power up/down fail RAM protection effective s/n 2613. 115. 900

47、411-01-A Correct page 18 drawing 115A. 900411-01B Rev 5 REV 5. 2 08/29/00 11 units serial number 3200 to 3307. Impliment ECO in all units having V3.0 software when the HSP board is changed or repaired. 127A.910917-00A Install version 3.01 to revise firmware to display correct firmware version on LAR

48、C power-up for V3.01. 128. 911015-00 Correct marginal timing in DMAREQ reset circuitry which contributes to intermittent muting during program loads and MIX paramter updates. Delete Stk # 330-04567, IC 74HCT32, U25 and add Stk# 330-07599 IC 74AC32, U25. To done during repair process on an as needed

49、basis. 129. 911024-00 To add program and preset cartridges to the 480l shipments. All future sales of 480ls will included these items. 130. 920120-01 MOTHERBOARD, Rev 2, correct power fail circuit to prevent corruption of user registers. There is no product in the field. 130A. 920120-00AMOTHERBOARD, Rev 3, correct artwork for Rev 3 prototype motherboard for Rev 4 production buy. Cover component installationproblem with Rev 3 proto type boards, Serial M-3602 M-3603. 131. 911223-00 LARC, this ECO is to remove the cassette option from the Larc. It is not re