Powersoft K2 Series User manual

powersoft_k2k3_service_man_v1.4.docx

Version 1.4

July 2013

K2 –K3 Series

K2 –K3 Service Manual

Index

1. Opening the amplifier cover

2. Discharging the amp capacitors

3 –4

3. Removing the power supply board

4 –8

4. Removing the amplifier output board

9 –12

5. Removing the fan

6. Removing the display

13 –14

7. Instruments and tools for testing

8. Firmware update procedure

14 –15

9. Removing the control board (k-cntrl)

10. Error codes

15 –16

11. Mechanical parts

17 –18

12. K2-K3 spare parts list

19 –25

K2 –K3 Service Manual

1. OPENING THE AMPLIFIER COVER

Disconnect the amplifier from the mains. If the amplifier

has been connected to the mains in the last few minutes,

please proceed with attention as the internal capacitors

bank could be charged and harmful!

Remove the side support steel bars, unscrewing the four

bigger screws with a Phillips PH1 screwdriver. Then

remove the screw in the center using a smaller Phillips

PH 0.

Remove the amplifier cover unscrewing the eight screws

(four in the front, two in the centre and three in the

rear) using a screwdriver Phillips PH 0:

2. DISCHARGING THE AMP CAPACITORS

Before proceeding in operating inside the amplifier it is

necessary to check if the rails are completely discharged:

LEDs in picture below should be off, this should happen

about 15 minutes after the amplifier has been switched

off and disconnected from the mains.

If the LEDs are still on discharge the capacitors bank by

connecting a lamp of at least 40 W/230V

to the connectors seen in the two pictures below

Smaller screw, screwdriver Phillips PH 0

Bigger screws, screwdriver Phillips PH 1

Eight screws, screwdriver Phillips PH0

Rail LEDs should be off; if not, discharge capacitor banks

Position of connectors for discharging capacitors bank

Lamp (min.40W/230V, best 60W/230V): dummy load for discharging the

amplifier’s capacitors bank

K2 –K3 Service Manual

Once the amplifier is open and its power supply fully

discharged, it is possible to start removing the single

boards.

3. REMOVING THE POWER SUPPLY BOARD

Disconnect the faston between the power supply board

and the output amplifier board :

Following this, unscrew the fans power cables close to

the previous faston.

Disconnect and remove the flat cable bridge between

the power supply board and output amplifier board:

Detail of connectors

Negative to this connector

Positive to this connector at first and then to this other one

Opened amp

Fastons between power supply board, output amplifier board and fan

power cables to be disconnected

Disconnected fastons between power supply board, output amplifier

board and fan power cables

Flat cable to be removed

K2 –K3 Service Manual

Disconnect the amplifier power switch cable removing

the faston behind it:

It is now possible to remove the power supply board by

unscrewing it from the amplifier chassis, removing with

a Phillips PH 1 screwdriver the 7 screws plus the brass

stand-off as illustrated below:

Overview of the 7 screws (1-7) and of the brass stand-off (8)

to unscrew for removing the power supply board

Removed flat cable

Amplifier power switch cable to be removed

Detail of screws number 1-2

Detail of screws 3 and 4

Faston of the amplifier power switch cable removed

K2 –K3 Service Manual

Once all the 8 screws have been removed, remove the

power supply board heat sink screws with an M3

hexagonal key:

Detail of screw number 5

Detail of screw number 6

Detail of screw number 7

Detail of brass stand-off (screw number 8)

Heat sink screws to be removed

K2 –K3 Service Manual

Now remove the mains plug holder by pressing on its

sides; then remove the mains socket screws:

Proceed in unscrewing the nut that holds the earth

ground cable behind the mains connector:

Now remove the rear panel:

Heat sink screws removed

Mains connector screws to be removed

Mains connector screws removed

Earth ground nut to be removed

Detached rear panel

Rear panel screws to be removed

K2 –K3 Service Manual

The power supply board will not be freed until the fan is

not removed from the amplifier chassis. Remove the fan

power cable and the fan screws:

Now it is finally possible to remove the complete power

supply board from the amplifier chassis:

Fan screws to be removed

Fan power cable holders to be removed

Fan removed from the amplifier chassis

Power supply board removed from the amplifier chassis

Lift and pull the power supply board to remove it

from the amplifier chassis

K2 –K3 Service Manual

4. REMOVING THE AMPLIFIER OUTPUT

BOARD

Before removing the amplifier output board, please

proceed in discharging the power supply capacitors as

explained in chapter 2.

Start from unscrewing the rear panel connectors

removing the mains connector screws and plug holder

as in the images below:

proceed in removing the all rear panel by unscrewing the

screws as marked in the images below

Now remove the two flat cables between the power

supply board and the amplifier output board:

Remove the nuts that hold the amplifier output board

heat sink:

Mains connector screws to be removed

Removed mains connector screws

Rear panel screws to be removed

Detached rear panel

Flat cable to be removed

Flat cable removed

Unscrew this nut

K2 –K3 Service Manual

Now remove the amplifier output board by unscrewing

the 7 screws marked in the overview image below and

in the following images:

Once all the 7 screws have been removed, unplug the

two flat cables that connect the optional KAESOP board

(if installed) to the front panel RJ45 plugs:

Nuts unscrewed and removed

Screws 1, 2 and 3 to be removed

Amplifier output board overview

Screw 4 to be removed

Screw 5 and 6 to be removed

Screw 7 to be removed

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