powersoft_k2k3_service_man_v1.4.docx
© 2013 Powersoft
Version 1.4
July 2013
K2 – K3 Series
2
K2 – K3 Service Manual
Index
1. Opening the amplifier cover
3
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
12
6. Removing the display
13 –14
7. Instruments and tools for testing
14
8. Firmware update procedure
14 –15
9. Removing the control board (k-cntrl)
15
10. Error codes
15 –16
11. Mechanical parts
17 –18
12. K2-K3 spare parts list
19 –25
3
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
4
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
5
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
6
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
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