TC Electronic M5000 Quick start guide
Service Note
Product Description: Service note no.
M5000 Modification to avoid E04 when warm 71210T057
Filename: SNo_T057.doc
Date: 01-03-2007 TC Electronic Page 1of 3
This modification concerns only M5000s with serial no. between 280000 and 281720.
A combination of warm environment, low main voltage and electrically noise might cause the error
message E04.
To avoid this problem the following modification at the CPU PCB (M5000-x) is necessary.
1. Disconnect power
2. Remove the top cover and the bottom cover.
3. Remove the 3 cables to the CPU-PCB. The 3 cables are connected to J2, J3 and J4. See fig. 1.
4. Remove the CPU PCB by unscrewing 2 screws on the solder side of the PCB and by unscrewing the 2
jack nuts. See fig. 2.
Service Note
Product Description: Service note no.
M5000 Modification to avoid E04 when warm 71210T057
Filename: SNo_T057.doc
Date: 01-03-2007 TC Electronic Page 2of 3
5. Lift out (carefully) pin 11 at the two chips called IC6 and IC7 on the CPU PCB. See fig. 3.
6. Solder a wire from IC6 pin 11 (lifted out) to IC9 pin 4.
Service Note
Product Description: Service note no.
M5000 Modification to avoid E04 when warm 71210T057
Filename: SNo_T057.doc
Date: 01-03-2007 TC Electronic Page 3of 3
7. Solder a wire from IC6 pin 11 (lifted out) to IC7 pin 11 (lifted out).
8. Mount the CPU PCB again with the 2 screws and the 2 jack nuts.
9. Mount the 3 cables again.
10. Mount top and bottom cover.
About the schematics.
After this modification the signal called AS* is no longer connected to IC6 and IC7.
Instead the signal called RAS* is connected to IC6 and IC7.
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