Table Of Contents - powersoft DigiMod PFC2 Service Manual

Index:
1. Testing Equipment
2. Opening the Module's Cover
3. Discharging the Capacitor's Bank
4. Main Board Layout
5. Troubleshooting
Checking the Fuse and Varistor
Checking the MOSFETs for short circuit
Checking the Power Supply
Amp stage current consumption
Checking the PFC Converter
Switching the Module On in DC
Checking modules in DC - PSU Current Consumption
Checking the Control Board's LEDs
Checking the Rail's Voltages
Checking the Auxiliary Voltage
Checking the Control Board
Checking the Output Stage MOSFETS
Checking the Output Stage
Output Current Offset Calibration Procedure
KT000291 Interface Board
Switching the Module On in AC -
8Ω LOAD CONNECTED (1KW max power) AT000043
Adjusting the level of the Input Signal
Thermal Limit
VOUTMON Voltage
IOUTMON Voltage
Testing the rails Volt Voltage
Testing the Power Supply Shutdown
6. Main Board Disassembly
DigiMod PFC2
DigiMod PFC4
7. Replacing the Sil Pads
8. DSP FW Installation Procedure
9. Firmware Upgrade via DigiMod PFC Manager
10. Repair Kit List
11. Final Checklist
Any evidence of tampering by unathorized personnel results
in immediate termination of the warranty.
Required Instrumentation
Dual stabilized power supply 30 Vdc 5 A
Digital Oscilloscope 50 Mhz
Signal generator
Variac
Dummy load 1500 W 8 Ohm
Soldering Station
SMD rework soldering station
Digital Multimeter
Pc with at least 1 eth board
4
5
6
7
8
WE RECOMMEND
ARE CARRIED OUT BY A TECHNICIAN IN THE MANNER
8
DESCRIBED IN THIS GUIDE.
8
9 IF NOT EXPLICITLY STATED OTHERWISE, DISCONNECT THE
AMPLIFIER FROM THE MAINS BEFORE OPERATING THE
10
AMPLIFIER.
11
12
WARNING! INTERNAL CAPACITORS BANK COULD BE CHARGED
AND HARMFUL: TAKE CARE OF COMPLETELY DISCHARGE
13
INTERNAL CAPACITORS BANK BEFORE HANDLING THE DEVICE
14
14 This technical document aims to be a support guide in repairing
and low-voltage testing the DigiMod PFC2 and PFC4 power
15
amplifiers.
15
The troubleshooting approach will help you characterize the kind
16
of fault you incur. A recovery method and the related assembly
19
outline detail is thoroughly explained for the most common faults.
20
The components to be replaced are clearly shown to help their
21
identification. At the end of this guide you can find a detailed
list with the description and the respective Powersoft internal
21
reference code of the spare parts.
23
Always use an anti-static wrist band while servicing the amplifier.
24
This documentation contains proprietary information which is the
sole property of Powersoft S.p.A.
24
These documents are confidential and reserved and may not be
24
disclosed, reproduced and shared with third persons or used
25
without the express written permission from Powersoft S.p.A.
25
Should the service centre agreement between the two companies
26
be interrupted these documents must be returned to Powersoft
26
S.p.A. Italy or proof of their destruction be provided.
Data are subject to change without notice.
27
For the latest release please refer to the online version available on
28
www.powersoft-audio.com.
30
31
33
Tools:
33
• Phillips PH 0 screwdriver.
• Phillips PH 1 screwdriver.
• M5 socket wrench.
• Small cutter
• Tweezers
Q.ty Example/Comments
2 APLHA Electronica mod. AL852D or equivalent
1 TEKTRONIK TBS - 1052B-EDU or equivalent
1 Rigol DG1022, Feeltech FY3200S
1 Toroidal 3 KW (Mono phase)
1 TE CONNECTIVITY / CGS TE1500B10RJ Resistor
1 WELLER PU81 + WSP80 or equivalent
1 GORDAK 952 or equivalent
1 FLUKE 179 or equivalent
1
DigiMod PFC2 - PFC4 | SERVICE MANUAL
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
THAT ALL SERVICE OPERATIONS