M-Drive
Service Manual
Keep this manual
for future reference
©2016 Powersoft
powersoft_MDrive_servman_en_v0.6
Intentionally left blank
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
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.
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 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.
4
M-Drive | SERVICE MANUAL
INDEX
Lamp (min.40W/230V, best 60W/230V)
NOT INCLUDED
IpalMod Pressure Sensor
CB000589.R DigiMod Mains DC Cable
CB000684.R DigiMod PFC2-PFC4 MDRIVE PSU AUX Voltage Cable
1. Testing Equipment
KT000291 Interface Board
KT000193 IpalMod Interface Board
CB000591.R PFC2-PFC4 PSU AUX Voltage Cable
+18Vdc
LM7812
5
M-Drive | SERVICE MANUAL
INDEX
2. Removing the Module’s Cover
3. Main Board Layout:
By means of an M5 Socketed Screwdriver, remove the
two metal spacers highlighted on (Fig. 1) and remove the
DSP Board by unclipping it from the retaining brackets.
(Fig. 1)
(Fig. 2)
Using a PH1 Phillips Head Screwdriver, unscrew all 8
screws highlighted on (Fig. 2).
Note that one of the screws could be hidden underneath
the label.
Gently lift the cover from the DSP board side, disconnect
the 2 fans power cables.
It is now possible to safely remove the board.
CH1
CH2
PFC
EMI
FILTER
SECONDARY BULK
DSP SLOTS
6
M-Drive | SERVICE MANUAL
INDEX
4. Discharging the Module’s Capacitors Bank:
5. Troubleshooting:
Checking the Output IGBTs
(Fig. 3)
Highlighted on (Fig. 3) are pins 1/2 and 19/20.
Connect one end of a 60w Light Bulb as indicated on
(Fig. 3)
With a Multimeter set to Ohm, check for any short circuit
in the Output IGBTs by probing the points highlighted on
(Fig. 4)
Insert the DSP Board in the SO1000 socket.
Connect the Interface to the DSP Board.
Proceed by connecting the PFC2-PFC4 AMP AUX
Voltage Cable to the PL2 connector on the module and
replicate the connections on the portrayed External
Power Supply.
Slowly increase the output voltage on the power supply
to +12Vdc and -12Vdc (Fig. 5).
Check the absorption, fans and interface must be
disconnected:
Red +18Vdc: 40mA
Black -18 Vdc: 40mA
Green +12Vdc: 470mA ± 15%
Blue -12Vdc: 50mA ± 15%
The following page contains further testing procedures to
be completed with the use of an oscilloscope.
Zoom on the waveforms to check the shape of the
resulting waves.
Out Of Range Values, Blown IGBTs are signs of
malfunction in the AMP section, please order the
KT000852.R KIT M-DRIVE AMP 1CH.
(Fig. 4)
Ω
Ω
(Fig. 5)
+18 V 40 mA
+12 V 470 mA
–18 V 40 mA
–12 V 55 mA
DSP Board interface connectors
8
M-Drive | SERVICE MANUAL
INDEX
Checking the Power Supply
Checking the AUX Voltages
18 V 44mA
With a Multimeter set to Ohm, check the varistor by
probing on the points highlighted on (Fig. 6)
There should be no continuity between the two points.
∞Ω
Ω
(Fig. 6)
Ω
(Fig. 7)
Unplug one end of both fuses and check for continuity
on the points highlighted on (Fig. 7) by probing with a
multimeter set to Ohm.
There should be continuity between the two points.
0Ω (Short)
Connect an external DC power supply to the PL1
connector by means of the PFC2 PFC4 AUX Voltage
Cable, as portrayed on (Fig. 8).
Slowly increase the output voltage and check the
absorption:
18Vdc : 44mA
(Fig. 8)
9
M-Drive | SERVICE MANUAL
INDEX
Checking the PSU Mosfets
13Vpp 44KHz
Color Label Description Led Status
D39 Channel Mute Default OFF
D37 Temperature Protection Default OFF
D6 +VCC Default ON
D8 -VCC Default ON
Color Label Description Led Status
D2 +5Vdc SOLID ON
D8 Signal Clip ON
D4 Protection Active ON
D5 Ready SOLID ON
6. LED Charts:
D39
D37
D6
D8
D2
D8
D5
D4
Interface Board
Color Label Signal Status
RED PROTECT
Signal protection
active SOLID ON
No pressure sensor
connected BLINKING
RED LIMIT Limiter active SOLID ON
GREEN SIGNAL Input signal present SOLID ON
GREEN E.SAVE - SOLID OFF
YELLOW TEMP Thermal protection
active SOLID ON
GREEN READY No faults, system
fully operating SOLID ON
GREEN ON System on SOLID ON
Keep the board alive by supplying 18Vdc through the
PL1 connector by means of the PSU AUX Voltage Cable.
Using an oscilloscope, check the waveform’s shapes by
probing the points indicated .
As portrayed on (Fig. 9).
(Fig. 9)
Out Of Range Values, Blown Fuses/Varistor are sign
of malfunction in the PS Section, please order the
KT000851.R KIT M-DRIVE PSU Repair Kit.
18 V 44mA
10
M-Drive | SERVICE MANUAL
INDEX
7. Switching the Module On in DC:
8. Checking the Module in DC:
Function Generator
Connect the Interface Board and the Pressure Sensor,
disconnect the Fans.
Portrayed on (Fig. 10) is the connection’s diagram
between two DC Power Supplies and the PL15 Connector
by means of the DigiMod Mains DC Cable.
Slowly increase the voltages on both power supplies to
spec, whilst on stationary regimen the current absorption
should fall to 200 mA.
If the Fans are inserted the absorption should fall to 217 mA.
CAUTION: the inrush current may rise up
to 3.15 Apeak!
A Function generator is needed in order to test the
module’s Output Stage, since the module is DC powered
and operates without a Heatsink, it is very important to
test it with an adequate input signal.
The function generator must be capable of generating a
signal composed by 80 ms of a 50 Hz sine-wave burst
every 560 ms of silence (50 Hz 4/32 sine-wave), as
portrayed on (Fig. 11).
For testing purposes, the amplitude is set to 1 VRMS
30 V 200mA
30 V 200mA 30 V 200mA
30 V 200mA
(Fig. 10)
time (ms)0 100 200 300 400 500 600
0,7
-0,7
-1,4
1,4
640
80
voltage (V)
time (ms)0
0,7
-0,7
-1,4
1,4
voltage (V)
3010 20
(Fig. 11)
DISCONNECT ALL PREVIOUSLY MADE CONNECTIONS
NO LOADS CONNECTED
11
M-Drive | SERVICE MANUAL
INDEX
Connect the IpalMod Pressure Sensor to the CN109 connector on
the module’s DSP Board.
Complete the rest of the connection between the DPC Board and
the module’s DSP Board.
Connect the module to the KT000291 Interface.
Setup
PAY EXTRA ATTENTION WHEN USING THE
KT000291 SERVICE BOARD, ANY IMPROPER AC-
CIDENTAL CONNECTION MAY CAUSE DAMAGES
TO THE AMPLIFIER.
12
M-Drive | SERVICE MANUAL
INDEX
Checking the AUX Tensions
Checking the TEMPMON 1/2 Thermal Limits
Checking the Rail’s Voltages in DC (No Load)
V
V
(Fig. 12)
V
(Fig. 13)
V
(Fig. 14)
With a multimeter set to V, check the tensions on the
KT000291 Interface board by probing on the points
highlighted on (Fig. 12)
+12Vdc: +12Vdc ±10%
-12Vdc: -12Vdc ±10%
+5Vdc: +5Vdc ±5%
With a multimeter set to V, check the tensions on the
KT000291 Interface board by probing on the points
highlighted on (Fig. 13)
TEMPMON 1/2: 1.75Vdc ±15%
Switch on the module in DC and wait 30 seconds in order
to trigger the Stand-By mode
With a multimeter set to V, check the tensions on the
KT000291 interface board by probing on the points
highlighted on (Fig. 14)
+VCCMON 1/2: +30 Vdc ±5% (+VRail: +60 Vdc)
-VCCMON 1/2: -30 Vdc ±5% (-VRail: -60 Vdc)
13
M-Drive | SERVICE MANUAL
INDEX
Switching the Module ON in AC
(Fig. 12)
Remove al previously made connections.
Connect a variac to the PL15 Connector, and slowly
increase the voltage to 120 VAC.
Checking the Rail’s Voltages in AC (With Load)
Connect the Function Generator to the module’s DPC
Board. (Fig. 15)
Turn the potentiometer completely clockwise.
Feed the module with a 50Hz 8/32 Burst Sine Wave @ 1 Vrms
(0 dBV, 2.21 dBu) amplitude.
(Fig. 15)
With a multimeter set to V, check the tensions on the
KT000291 interface board by probing on the points
highlighted on (Fig. 117)
+VCCMON 1/2: +75 Vdc ±5% (+150Vcc)
-VCCMON 1/2: -75 Vdc ±5% (-150Vcc)
V
(Fig. 17)
14
M-Drive | SERVICE MANUAL
INDEX
(Fig. 15)
Connect a FUnction Generator to input (CN11)
By means of the DigiMod Mains DC Cable, connect a
Variac to the CN4 Connector and slowly increase the
voltage to 120 VAC.
Genate a signal @ 0.1 Vrms - 100 Hz
Connect an oscilloscope to the CH1 output and confront
the resulting wave. Repeat the operation with the
remaining Channel.
Once this tests are carried out succesfully, connect a 1000W 8Ω Load to the Output and leave the unit one for at least 10 minutes (PER
CHANNEL)
5.00 V - 10us 5.00 V - 10us
14.5Vpp 100Hz 14.5Vpp 100Hz
100 Hz Sine
Audio Tests
15
M-Drive | SERVICE MANUAL
INDEX
DPC Board LED Status Charts
Color Label LED Status
Green PRESET OFF
Green ON SOLID ON
Green READY SOLID ON
Yellow TEMP OFF
Green ESAVE OFF
Green SIGNAL SOLID ON
Red LIMIT SOLID ON
Red PROTECT OFF
LED Configuration at Startup
Color Label LED Status
Green PRESET OFF
Green ON SOLID ON
Green READY SOLID ON
Yellow TEMP OFF
Green ESAVE OFF
Green SIGNAL OFF
Red LIMIT OFF
Red PROTECT OFF
LED Configuration after 3 seconds
Color Label LED Status
Green PRESET OFF
Green ON SOLID ON
Green READY SOLID ON
Yellow TEMP OFF
Green ESAVE OFF
Green SIGNAL OFF
Red LIMIT OFF
Red PROTECT OFF
LED Configuration after 30 seconds
16
M-Drive | SERVICE MANUAL
INDEX
9. Main Board Disassembly:
By means of a PH1 Phillips Head screwdriver, screw all 19 screws highlighted in purple.
Remove the nut marked orange with a M5 socketed hex screwdriver.
Gently lift the board.
10. SilPad Replacement:
IS000036 38x23mmIS000060 52x30mm
IS000060
IS000060
IS000060
IS000060
IS000036
IS000036
IS000036
IS000036
IS000040
IS000040
Always replace all silpads once the service procedure has been ultimated.
Cut the IS000040 SilPad with a pair of sharp scissors.
IS000040 18x30mm
18
M-Drive | SERVICE MANUAL
INDEX
12. Firmware Update Procedure
In order to update the Firmware, download the latest
version of the Firmware Updater on the Powersoft
Website. (RESTRICTED AREA > SERVICE CENTRE AMP
MODULES > MDRIVE TOOLS)
Contact the Powersoft Service in order to obtain the
latest rmware version.
Install the RS485 driver.
Connect the DPC Interface to the module.
Connect the module to the PC by means of the PC000096
adapter and the CB000214 cable.
Set the ID to 9.9.
Run the Firmware Updater (v1.1.40 onward).
Select “Update MDrive Firmware”. (Fig. 38)
WARNING: DO NOT DISCONNECT THE
MODULE WHILST TESTING!!!
M-DRIVE
PC
DPC INT
RS485
KT000193
Interface
M-DRIVE
Pressure
Sensor
SET 9.9
RS485
PC
PC000096
CB000214
1
19
M-Drive | SERVICE MANUAL
INDEX
Once the update has been completed, disconnect the module from the mains power supply and wait a few minutes in order to discharge
the internal capacitors bank.
Cycle the module (power it on, wait for the completion of the startup procedure and switch it off)
The Firmware Update Procedure is completed.
Select the .bin file (available on the restricted area)
Select the module to be updated.
Click on the right arrow.
Wait for the Red Text to disappear (approx 3 minutes) Once the Update is complete, the program will prompt a confir-
mation box, click OK. The Update is now complete.
Click on “YES” to confirm the FW Update Procedure.
Tick the “Use RS485” Box, and select the assigned COM Port
Click on the right arrow, the LED on the RS485 should be blinking
red.
2
4
6
3
5
7
m_drive
20
M-Drive | SERVICE MANUAL
INDEX
Launching the PowerControl Manager
Click on the module
Select the “default preset 1.5.7.bin” File (or any of its latest releases avail-
able on the restriced area)
The procedure will be over once the “loading preset” pop up disappears.
Click on the EQ Window
Click on “Load”
Click on “Find Amplifiers”
Verify that the RED LED on the RS485 is blinking
Set up the working area in the same manner described in the FirmWare Update Procedure.
The factory preset is available in: restricted area - service amp modules - MDrive tools
Switch the MDrive On.
Launch the PowerControl Manager (v 2.3.15 onward)
1
3
5
2
4
6
13. Initialization Procedure (restore to Factory Presets)
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