Studer-928-lim-sn 电路图 维修手册.pdf

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1、 Service Note928 01-01 4.7.01 GEMixing Console 928Page 1 of 3 Input Unit mono 1.928.220.82, 1.928.221.82, 1.928.222.82, 1.928.224.82 Input Unit stereo1.928.250.81, 1.928.252.81 Studio Monitor Unit 1.928.520.83 ReasonCrosstalk from TB-mic. signal to master A and B Solution- Levelreduction of talkback

2、 signal on the bus - Modification of grounding in the studio monitor unit Input Unit mono: Versionbefore modification :after modification : 1.928.220.821.928.225.00 1.928.221.821.928.226.00 1.928.222.821.928.227.00 1.928.224.821.928.229.00 shipped since1. July 2001 Modification : The upgrade should

3、be performed by qualified personnel only. Please consider the safety and EMC section in the service and operation manual. Replace R130 old: 22kOhm to new: 560Ohm Replacelabel sticker according version list Removerevision sticker “A” Required components : 1.928.089.00Crosstalk modification kit 928 Ra

4、dioFans.CN 收音机爱 好者资料库 Service Note928 01-01 4.7.01 GEMixing Console 928Page 2 of 3 Input Unit stereo: Versionbefore modification :after modification : 1.928.250.811.928.255.00 1.928.252.811.928.257.00 shipped since1. July 2001 Modification : The upgrade should be performed by qualified personnel onl

5、y. Please consider the safety and EMC section in the service and operation manual. Replace R220 old: 22kOhm to new: 560Ohm R228 old: 22kOhmto new: 560Ohm Replacelabel sticker according version list Removerevision sticker “A” Required components : 1.928.089.00Crosstalk modification kit 928 Studio Mon

6、itor unit: Versionbefore modification :after modification : 1.928.520.831.928.525.00 shipped since1. July 2001 Modification : The upgrade should be performed by qualified personnel only. Please consider the safety and EMC section in the service and operation manual. Replace R75 old: 10 kOhm to new:

7、22 kOhm R77old: 39 kOhmto new: 2,2 kOhm R253 old: 10 Ohmto new: 0 Ohm Cut out pin 28A / 28C / 29A / 29C (0V Reference) from connector CN1 Replacelabel sticker according version list Required components : 1.928.089.00Crosstalk modification kit 928 RadioFans.CN 收音机爱 好者资料库 Service Note928 01-01 4.7.01

8、GEMixing Console 928Page 3 of 3 Wiring of main bus board: Modification : The upgrade should be performed by qualified personnel only. Please consider the safety and EMC section in the service and operation manual. Remove0Vref bus wiring from each bus board according drawing. Insert0Vref link cables 1.928.089.93 on each bus board according drawing. Required components : 1.928.89.0 Crosstalk modification kit 928 RadioFans.CN 收音机爱 好者资料库