powersoft IpalMod Service Manual page 3

Index:
1. Testing Equipment
2. Discharging the Module's Capacitors Bank
3. Removing the cover
4. Main Board Layout
5. Disassembling the main board
6. Troubleshooting
Checking the output mosfets
Checking the fuse and varistor
Checking the PSU Stage
Switching the module on in DC
Checking the Vrails voltage in DC
Checking the output stage
7. Testing the module in AC
Switching the Module on in AC
Checking the rails voltage in AC
Audio Tests
8. Offset calibration
9. LED charts
10. Known Issues
Excessive Gain on the Output Stage
11. Reassembling the module
12. Firmware Update Procedure
13. Initialization Procedure
14. Repair Kit List
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
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5
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WE RECOMMEND
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ARE CARRIED OUT BY A TECHNICIAN IN THE MANNER
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DESCRIBED IN THIS GUIDE.
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IF NOT EXPLICITLY STATED OTHERWISE, DISCONNECT THE
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AMPLIFIER FROM THE MAINS BEFORE OPERATING THE
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AMPLIFIER.
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WARNING! INTERNAL CAPACITORS BANK COULD BE CHARGED
AND HARMFUL: TAKE CARE OF COMPLETELY DISCHARGE
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INTERNAL CAPACITORS BANK BEFORE HANDLING THE DEVICE
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This technical document aims to be a support guide in repairing
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and low-voltage testing the IpalMod amplifier module.
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The troubleshooting approach will help you characterize the kind
of fault you incur. A recovery method and the related assembly
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outline detail is thoroughly explained for the most common faults.
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The components to be replaced are clearly shown to help their
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identification. At the end of this guide you can find a detailed
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list with the description and the respective Powersoft internal
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reference code of the spare parts.
Always use an anti-static wrist band while servicing the amplifier.
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This documentation contains proprietary information which is the
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sole property of Powersoft S.p.A.
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These documents are confidential and reserved and may not be
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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.
Data are subject to change without notice.
For latest update please refer to the English online version available
on www.powersoft-audio.com.
Tools:
• 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
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IPALMOD | SERVICE MANUAL
CAUTION
RISK OF ELECTRICK SHOCK
DO NOT OPEN
THAT ALL SERVICE OPERATIONS