Service Note 928 01-01
Input Unit mono 1.928.220.82, 1.928.221.82,
1.928.222.82, 1.928.224.82
Input Unit stereo 1.928.250.81, 1.928.252.81
Studio Monitor Unit 1.928.520.83
Reason Crosstalk from TB-mic. signal to master A and B
Solution - Levelreduction of talkback signal on the bus
- Modification of grounding in the studio monitor unit
Input Unit mono:
Version before modification : after modification :
1.928.220.82 1.928.225.00
1.928.221.82 1.928.226.00
1.928.222.82 1.928.227.00
1.928.224.82 1.928.229.00
shipped since 1. 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 R130 old: 22kOhm to new: 560Ohm
Replace label sticker according version list
Remove revision sticker “A”
Required components :
1.928.089.00 Crosstalk modification kit 928
4.7.01 GE Mixing Console 928 Page 1 of 3
Service Note 928 01-01
Input Unit stereo:
Version before modification : after modification :
1.928.250.81 1.928.255.00
1.928.252.81 1.928.257.00
shipped since 1. 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 R220 old: 22kOhm to new: 560Ohm
R228 old: 22kOhm to new: 560Ohm
Replace label sticker according version list
Remove revision sticker “A”
Required components :
1.928.089.00 Crosstalk modification kit 928
Studio Monitor unit:
Version before modification : after modification :
1.928.520.83 1.928.525.00
shipped since 1. 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: 22 kOhm
R77 old: 39 kOhm to new: 2,2 kOhm
R253 old: 10 Ohm to new: 0 Ohm
Cut out pin 28A / 28C / 29A / 29C (0V Reference) from connector CN1
Replace label sticker according version list
Required components :
1.928.089.00 Crosstalk modification kit 928
4.7.01 GE Mixing Console 928 Page 2 of 3
Service Note 928 01-01
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.
Remove 0Vref bus wiring from each bus board according drawing.
Insert 0Vref link cables 1.928.089.93 on each bus board according drawing.
Required components :
1.928.89.0 Crosstalk modification kit 928
4.7.01 GE Mixing Console 928 Page 3 of 3
Loading...