powersoft M28Q Service Manual

INDEX
CAUTION
RISK OF ELECTRICK SHOCK
DO NOT OPEN
M SERIES | SERVICE MANUAL
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 AM-
PLIFIER.
WARNING! INTERNAL CAPACITORS BANK COULD BE CHARGED
AND HARMFUL: TAKE CARE OF COMPLETELY DISCHARGE IN-
TERNAL CAPACITORS BANK BEFORE HANDLING THE DEVICE
This technical document aims to be a support guide in repairing
and low-voltage testing the M Series power ampliers.
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
identication. At the end of this guide you can nd a detailed list
with the description and the respective Powersoft internal refer-
ence code of the spare parts.
Always use an anti-static wrist band while servicing the amplier.
Data are subject to change without notice.
For latest update please refer to the English online version available
on www.powersoft-audio.com.
Tools:
1. Service Repairing Kit 4
2. Opening the amplier cover 5
3. Discharging the internal capacitor’s bank 6
4. Troubleshooting 7
5. Removing the main board 8
6. Removing the fan 10
7. Removing the front panel 11
8. Removing the Heatsink 13
9. Changing the operating voltage 15
10. Testing the main board 16
11. Internal LED Check 22
12. VOID VQ Lantronix Device Initialization 23
13. Repair Kit List 25
14. Replacement Boards 26
15. Mechanical Parts 27
Index:
• Phillips PH 0 screwdriver.
• Phillips PH 1 screwdriver.
• M2 hexagonal wrench.
• M3 hexagonal wrench.
• M5 socket wrench.
• Lamp (min.40W/230V, best 60W/230V) as dummy load for
discharging amplier capacitors bank.
• Two continuous voltage supplier:
• 0 V to 50 V, 5 A continuous voltage supplier;
• ±30 V, 0 - 3 A rails supplier.
• Function generator or test CD + CD player.
• Double trace oscilloscope (it must be disconnected from the
ground) and probes.
• Multimeter.
• Mains insulation transformer
This documentation contains proprietary information which is the
sole property of Powersoft S.p.A.
These documents are condential 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

powersoft M28Q Specifications

General

Brand	powersoft
Model	M28Q
Category	Amplifier
Language	English