INDEX
CAUTION
RISK OF ELECTRICK SHOCK
DO NOT OPEN
K6 K8 K10 K20 | SERVICE MANUAL
Tools:
Data are subject to change without notice.
For latest update please refer to the English online version availa-
ble on www.powersoft-audio.com.
WE RECOMMEND THAT ALL SERVICE OPERATIONS
ARE CARRIED OUT BY A TECHNICIAN IN THE MANNER
DESCRIBED IN THIS GUIDE.
IF NOT EXPLICITLY STATED OTHERWISE, DISCONNECT THE
AMPLIFIER FROM THE MAINS BEFORE OPERATING THE
AMPLIFIER.
WARNING! INTERNAL CAPACITORS BANK COULD BE CHARGED
AND HARMFUL: TAKE CARE OF COMPLETELY DISCHARGE
INTERNAL CAPACITORS BANK BEFORE HANDLING THE DEVICE
This technical document aims to be a support guide in repairing
and low-voltage testing the K6, K8, K10, and K20 power ampliers.
The troubleshooting approach will help you characterize the kind
of fault you incur. A recovery method and the related assembly
outline detail is thoroughly explained for the most common faults.
The components to be replaced are clearly shown to help their
identication. At the end of this guide you can nd a detailed
list with the description and the respective Powersoft internal
reference code of the spare parts.
Always use an anti-static wrist band while servicing the amplier.
1. Service repairing Kit 4
2. Opening the amplier cover 5
3. Discharging the internal capacitors bank 5
4. Layout 6
5. Troubleshooting 7
Checking the Amplier board 7
Checking the Power Supply board 8
6. Removing the Power Supply board 10
7. Removing the Amplier Output Board 13
8. Removing the KALIN heat-sink 15
Cleaning the heat-sink 16
9. Power Supply KALSU removal 17
10. Fan and Fan Driver Replacement 17
Removing the Fan 17
11. Removing the K-FRONT Display 19
12. Removing the K-CNTRL Board 20
Output Current Offset Calibration 20
13. DC Voltage Tests 22
Consumption of the Amplier Output Board 23
Testing the Output stage drivers 26
Output signal presence 27
14. FIrmware Update procedure 28
FIrmware Update procedure for K Series 28
Updating the amplier (Main) 28
Updating the Smart Card 29
Menu Diagrams 31
15. Copying PAM les from a Virtual Machine 32
16. Error Codes 33
17. Repair Kit List 34
18. Mechanical Parts 35
19. Replacement Boards 36
KDSP Board Installation 37
KAESOP Board Installation 38
Index:
• Phillips PH 0 and PH 1 screwdrivers
• Small cutter
• Tweezers
• Testing components kit
This documentation contains proprietary information which is the
sole property of Powersoft S.p.A.
These documents are condential and reserved and may not be
disclosed, reproduced and shared with third persons or used
without the express written permission from Powersoft S.p.A.
Should the service centre agreement between the two compa-
nies be interrupted these documents must be returned to Power-
soft S.p.A. Italy or proof of their destruction be provided.
Required Instrumentation Q.ty Example/Comments
Dual stabilized power supply 30 Vdc 5 A 2 APLHA Electronica mod. AL852D or equivalent
Digital Oscilloscope 50 Mhz 1 TEKTRONIK TBS – 1052B-EDU or equivalent
Signal generator 1 Rigol DG1022, Feeltech FY3200S
Variac 1 Toroidal 3 KW (Mono phase)
Dummy load 1500 W 8 Ohm 1 TE CONNECTIVITY / CGS TE1500B10RJ Resistor
Soldering Station 1 WELLER PU81 + WSP80 or equivalent
SMD rework soldering station 1 GORDAK 952 or equivalent
Digital Multimeter 1 FLUKE 179 or equivalent
Pc with at least 1 eth board 1
PLEASE NOTE THAT THE ONLY END USER AUTHORIZED MAINTENANCE PROCEDURE IS THE FILTER CLEANING PROCEDURE, ANY
EVIDENCE OF OTHER OPERATION CARRIED BY UNAUTHORIZED PERSONNEL WILL RESULT IN IMMEDIATE WARRANTY LOSS.
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