powersoft M-Drive, Service Manual

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CAUTION
RISK OF ELECTRICK SHOCK
DO NOT OPEN
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 M-Drive module.
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
identification. At the end of this guide you can find 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 amplifier.
This documentation contains proprietary information which is the
sole property of Powersoft S.p.A.
These documents are confidential 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 companies
be interrupted these documents must be returned to Powersoft
S.p.A. Italy or proof of their destruction be provided.
M-Drive | SERVICE MANUAL
Data are subject to change without notice.
For the latest release please refer to the online version available on
www.powersoft-audio.com.
INDEX
Tools:
1. Testing Equipment 4
2. Removing the Module’s Cover 5
3.
Main Board Layout
5
4. Discharging the Module’s Capacitors Bank 6
5. Troubleshooting 6
Checking the Output IGBTs
6
Checking the Power Supply
8
Checking the AUX Voltages 8
Checking the PSU Mosfets
9
6.
LED Charts
9
7. Switching the Module On in DC 10
8. Checking the Module in DC
10
Function Generator
10
Setup 11
Checking the AUX Tensions 12
Checking the TEMPMON 1/2 Thermal Limits
12
Checking the Rail’s Voltages in DC (No Load)
12
Switching the Module ON in AC 13
Checking the Rail’s Voltages in AC (With Load) 13
Audio Tests
14
DPC Board LED Status Charts 15
9. Main Board Disassembly:
16
10.
SilPad Replacement:
16
11.
Known Issues
17
Excessive Gain on the Output stage 17
12. Firmware Update Procedure
18
13.
Initialization Procedure (restore to Factory Presets)
20
14. Repair Kit List 21
Index:
• Phillips PH 0 screwdriver.
• Phillips PH 1 screwdriver.
• M5 socket wrench.
• Small cutter
• Tweezers
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
Any evidence of tampering by unathorized personnel results
in immediate termination of the warranty.