Studer-928-lim-sn 维修电路原理图.pdf

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1、 Service Note928 01-014.7.01 GEMixing Console 928Page 1 of 3Input Unit mono 1.928.220.82, 1.928.221.82,1.928.222.82, 1.928.224.82Input Unit stereo1.928.250.81, 1.928.252.81Studio Monitor Unit 1.928.520.83ReasonCrosstalk from TB-mic. signal to master A and BSolution- Levelreduction of talkback signal

2、 on the bus- Modification of grounding in the studio monitor unitInput Unit mono:Versionbefore modification :after modification :1.928.220.821.928.225.001.928.221.821.928.226.001.928.222.821.928.227.001.928.224.821.928.229.00shipped since1. July 2001Modification :The upgrade should be performed by q

3、ualified personnel only. Please consider thesafety and EMC section in the service and operation manual.Replace R130 old: 22kOhm to new: 560OhmReplacelabel sticker according version listRemoverevision sticker “A”Required components :1.928.089.00Crosstalk modification kit 928RadioFans.CN 收音机爱 好者资料库 Se

4、rvice Note928 01-014.7.01 GEMixing Console 928Page 2 of 3Input Unit stereo:Versionbefore modification :after modification :1.928.250.811.928.255.001.928.252.811.928.257.00shipped since1. July 2001Modification :The upgrade should be performed by qualified personnel only. Please consider thesafety and

5、 EMC section in the service and operation manual.Replace R220 old: 22kOhm to new: 560OhmR228 old: 22kOhmto new: 560OhmReplacelabel sticker according version listRemoverevision sticker “A”Required components :1.928.089.00Crosstalk modification kit 928Studio Monitor unit:Versionbefore modification :af

6、ter modification :1.928.520.831.928.525.00shipped since1. July 2001Modification :The upgrade should be performed by qualified personnel only. Please consider thesafety and EMC section in the service and operation manual.Replace R75 old: 10 kOhm to new: 22 kOhmR77old: 39 kOhmto new: 2,2 kOhmR253 old:

7、 10 Ohmto new: 0 OhmCut out pin 28A / 28C / 29A / 29C (0V Reference) from connector CN1Replacelabel sticker according version listRequired components :1.928.089.00Crosstalk modification kit 928RadioFans.CN 收音机爱 好者资料库 Service Note928 01-014.7.01 GEMixing Console 928Page 3 of 3Wiring of main bus board

8、:Modification :The upgrade should be performed by qualified personnel only. Please consider thesafety 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