powersoft Digimod Series User manual

Service Manual
Keep this manual
for future reference
©2016 Powersoft
powersoft_DigiMod500.1000.1500.2000HV.1000NPS_servman_en_v2.3
Digimod
DigiMod 500
DigiMod 1000
DigiMod 1500
DigiMod 2000HV
DigiMod 1000 NPS

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 DigiMod 500, 1000, 1500, 2000HV,
1000NPS Modules.
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
reference code of the spare parts.
Always use an anti-static wrist band while servicing the amplier.
DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
Tools:
Data are subject to change without notice.
For the latest release please refer to the online version available on
www.powersoft-audio.com.
INDEX
1. Testing Components Kit 4
2. Opening the Module’s Cover 5
3. Discharging the Module’s Capacitors Bank 6
4. Assembly Outline 6
5. Troubleshooting 7
Checking the Output Mosfets 7
Checking the R10 NTC 8
Checking the RV1 Varistor 8
Checking the F1 Fuse 8
Checking the Fan and Fan’s Driver 8
6. Main PCB Disassembly 9
DigiMod 500 | 1000 | 1500 | 2000HV 9
DigiMod 1000NPS 10
7. DC Voltage Testing 11
8. Output Current Offset Calibration Procedure 19
9. SilPad Replacement Procedure 20
10. FW Installation Procedure 21
11. Repair Kit List 22
12. Fake/Unauthorized Copies 23
Index:
• Phillips PH 0 screwdriver
• Phillips PH 1 screwdriver
• M3 hexagonal wrench
• M5 socket wrench
• Multimeter
• Soldering station
• Mains insulation transformer
• Function Generator

INDEX
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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
1. Testing Components Kit:
Lamp (min.40W/230V, best 60W/230V) for discharging the
amplifier’s capacitors bank
PSU AUX Voltage Cable
DigiMod Mains DC CableDigiMod AMP AUX Voltage Cable
DigiMod Mains Cable

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
2. Opening the Module’s cover:
Remove the Control Board by unscrewing the two steel
spacers with a M5 socketed wrench and un-clipping the
retainers highlighted in (Fig. 1)
(Fig. 1)
Locate and unscrew all 6 Phillips Head Screws holding
the module’s cover, 3 per side. (Fig. 2,3)
(Fig. 2)
(Fig. 3)
Carefully lift the cover, locate and unplug the fan’s power
cable. (Fig. 4)
(Fig. 4)

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
4. Assembly Outline:
3. Discharging the Capacitor’s Bank:
Connect one side of a 60W light bulb to the pins marked
(+) and the other side to a ground point, repeat on the
other side of the CN13 connector.
AMP SECTION
PS SECTION
(Fig. 5)
Remove Jumper to
insert external circuit
Remove Jumper to
insert external circuit
Remove Jumper to
enable DSP
Remove Jumper to
enable DSP

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
5. Troubleshooting:
Checking the Output Mosfets:
Check for any short in the Output Mosfets by probing with
a multimeter set to Ohm between the points highlighted
in (Fig. 6).
(Fig. 6)
DigiMod 500 | 1000 | 1500 | 2000HV
DigiMod 1000NPS
Ω Ω
Check for any short in the Output Mosfets by probing with
a multimeter set to Ohm between the points highlighted
in (Fig. 7).
Ω Ω
(Fig. 7)
Model Kit Number Description
DigiMod 500 KT000819.R KIT DM500 AMP 1CH
DigiMod 1000 KT000821.R KIT DM1000 AMP 1CH
DigiMod 1000NPS KT000822.R KIT DM1000NPS AMP 1CH
DigiMod 1500 KT000824.R KIT DM1500 AMP 1CH
DigiMod 2000 KT000827.R KIT DM2000 AMP 1CH
In case of any faults in the aforementioned components,
please refer to the table below when ordering the Repair Kit.

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
Checking the R10 NTC:
With the Multimeter set to Ohm, check for continuity in
the R10 NTC, by probing the points highlighted in (Fig. 8).
Checking the RV1 Varistor:
(Fig. 8)
Ω
Flip the module upside down.
With the Multimeter set to Ohm, check for continuity in
the RV1 Varistor, by probing the points highlighted in (Fig.
9).
(Fig. 9)
Ω
Checking the F1 Fuse:
With the Multimeter set to Ohm, check for continuity in
the F1 Fuse, by probing the points highlighted in (Fig. 10).
Ω
(Fig. 10)
Model Kit Number Description
DigiMod 500 KT000818.R KIT DM500 PSU
DigiMod 1000 KT000820.R KIT DM1000 PSU
DigiMod 1500 KT000823.R KIT DM1500 PSU
DigiMod 2000 KT000827.R KIT DM2000 PSU
In case of any faults in the aforementioned components,
please refer to the table below when ordering the Repair Kit.
Checking the Fan and Fan’s Driver (DigiMod1500, 2000HV only)
During the module’s booting procedure, the fan spins at full speed for a brief period of time.
A rst indication of any fault in the fan or the fan’s driver is the absence of the aforementioned passage.
In case of any fault, remove the fan from the casing and test it by supplying it with +24 Vdc.
If the fan begins to spin, the fault is in the fan’s driver, by contrast, if the fan does not begin to spin, the fault coulbe be in both the fan
and its driver.
Take care in mounting the fan with the label facing downwards, and use the original screws, longer ones could damage the capacitor’s bank.
Please refer to the table below if there is a fault in the Fan or the Fan’s driver.
Model Kit Number Description
DigiMod 1500 KT000825.R KIT DM1500 FAN
DigiMod 2000 KT000828.R KIT DM2000 FAN

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
6. Main PCB Disassembly:
DigiMod 500 | 1000 | 1500 | 2000HV
Using a M5 Socketed Wrench, and a regular M5 Wrench, remove all 9 screws and nuts highlighted in the pictures below.
Proceed by removing the retainer spring holding the Zobel resistor in place.
The image below portrays all 8 screws needed to be removed in order to separate the PCB from its casing.
It is now possible to carefully lift the main PCB out of its casing.

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
DigiMod 1000NPS
Using a M5 Socketed Wrench, and a regular M5 Wrench, remove all 4 screws and nuts highlighted in the pictures below.
Proceed by removing the retainer spring holding the Zobel resistor in place.
The image below portrays all 7 screws needed to be removed in order to separate the PCB from its casing.
It is now possible to carefully lift the main PCB out of its casing.

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
7. DC Voltage Testing:
Connect a DC Power Supply to the CN4 connector by means of
the PSU AUX VOLTAGE CABLE. (Fig. 11)
Slowly increase the voltage to +18V, and verify the consumption, it
should be as stated in the following table.
Model Consumption
DigiMod 500 20 mA ±10%
DigiMod 1000 20 mA ±10%
DigiMod 1500 20 mA ±10%
DigiMod 2000HV 20 mA ±10%
18Vdc 20mA
(Fig. 11)
Model Kit Number Description
DigiMod 500 KT000818.R KIT DM500 PSU
DigiMod 1000 KT000820.R KIT DM1000 PSU
DigiMod 1500 KT000823.R KIT DM1500 PSU
DigiMod 2000 KT000827.R KIT DM2000 PSU
In case of any faults in the aforementioned components, please refer
to the table below when ordering the Repair Kit.

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INDEX
18Vdc 20mA
By means of the PSU AUX VOLTAGE CABLE, supply +18Vdc to the module through the CN4 connector.
With an oscilloscope, check if the waveforms on the IGBTs pins are as portrayed in the picture below.

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INDEX
Connect a DC Power supply to the CN4 connector by means of the PSU AUX VOLTAGE CABLE, and supply +18 Vdc.
By means of the DIGIMOD AMP AUX VOLTAGE CABLE, connect a second power supply and set the output voltage to ± 15Vdc, and
check the absorption: it should be as portrayed in the table below.
Model +15V Consumption -15V Consumption
DigiMod 500 230 mA ± 10% 70 mA ± 10%
DigiMod 1000 300 mA ± 10% 70 mA ± 10%
DigiMod 1500 300 mA ± 10% 70 mA ± 10%
DigiMod 2000HV 300 mA ± 10% 70 mA ± 10%
18Vdc 20mA+15Vdc -15Vdc
Model Kit Number Description
DigiMod 500 KT000819.R KIT DM500 AMP 1CH
DigiMod 1000 KT000821.R KIT DM1000 AMP 1CH
DigiMod 1000NPS KT000822.R KIT DM1000NPS AMP 1CH
DigiMod 1500 KT000824.R KIT DM1500 AMP 1CH
DigiMod 2000 KT000827.R KIT DM2000 AMP 1CH
In case of any faults in the aforementioned components,
please refer to the table below when ordering the Repair Kit.

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
By means of the DIGIMOD AMP AUX VOLTAGE CABLE, connect a DC power supply and set the output voltage to ± 15Vdc.
Check the shape of the waveforms by first probing on the 2, 4 pins of the U15 IC, then check the shape of the waveforms by probing
on pins 6, 8.
The waveforms should be shaped as portrayed in the figure below.
+15Vdc -15Vdc

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
+15Vdc -15Vdc
By means of the DIGIMOD AMP AUX VOLTAGE CABLE, connect a DC power supply and set the output voltage to ± 15Vdc.
Check the shape of the waveforms by probing the highlighted pins on the Q3, Q4, Q5, Q6 Mosfets.
The waveforms should be shaped as portrayed in the figure below.

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
By means of the DIGIMOD PSU VOLTAGE CABLE, connect a DC power supply to the CN4 connector and set the output voltage to 18Vdc.
By means of the DIGIMOD MAIN DC CABLE, connect a second DC power supply and slowly supply +30Vdc to the module.
Verify the Rail Bus Voltage by probing on the highlighted points in the CN13 connector, it should be as portrayed in the following table.
18Vdc
+30Vdc
ΩV ΩV
Model Rail Bus Voltage
DigiMod 500 +/- 6.5 Vdc ±10%
DigiMod 1000 +/- 6.5 Vdc ±10%
DigiMod 1500 +/- 8.5 Vdc ±10%
DigiMod 2000HV +/- 14.5 Vdc ±10%

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
By means of the DIGIMOD AMP AUX VOLTAGE CABLE, connect a DC power supply and set the output voltage to ± 15Vdc.
Check the AUX voltages by probing on the highlighted points in the CN14 connector.
Alternatively it is possible to check the Aux Voltages while the board is removed from its chassis by checking the voltage regulators on
the back side of the board, as indicated on (Fig. 12)
+15Vdc -15Vdc
V
Ground
-12Vdc
+12Vdc +5Vdc
(Fig. 12)
Ground
+12Vdc
-12Vdc
+5Vdc

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
+15Vdc -15Vdc
By means of the DIGIMOD AMP AUX VOLTAGE CABLE, connect a
DC power supply and set the output voltage to ± 15Vdc. (Fig. 13)
(Fig. 13)
(Fig. 14)
Check the Control board by measuring its oscillator’s clock signal,
it should be 12MHz. (Fig. 14)
In this conguration, all 3 green LEDs should be on, whilst both
yellow ones should be OFF. (Fig. 15)
Any other LED conguration is a sign oaf a CNTRL Board fault, in
this case replace the CNTRL Board.
(Fig. 15)

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
Signal Signal CH1 Protect CH2 Protect +5Vdc +12Vdc -12Vdc
Indicated on (Fig. 16) are the Control Board LEDs and
their functions.
(Fig. 16)
Connect the power cable to the CN1 connector located
on the opposite side of the control board.
Check if all 3 green LEDs are on.
Connect a function generator or a cd player to the module
through the CN12, CN11 connectors.
Select an audio track from the Powersoft Test CD, or a
Sine wave test tone.
Verify the presence of audio signal by probing on the
CN7, CN3 connectors with an oscilloscope.
Signal Ground 2 Signal Ground 1 Balanced Input +2 Balanced Input -2 Balanced Input -1 Balanced Input +1
CH2 OUT + CH2 OUT -
CH1 OUT + CH1 OUT -
Indicated on (Fig. 17) is the pin out of the CN7, CN12,
CN11, CN3 connectors. (Fig. 17)
8. Output Current Offset Calibration Procedure:
Signal Ground 2 Signal Ground 1 Balanced Input +2 Balanced Input -2 Balanced Input -1 Balanced Input +1
CH2 OUT + CH2 OUT -
CH1 OUT + CH1 OUT -
Connect a Signal Generator/Cd Player to the module via
the CN12, CN11 Connectors.
Supply a 1Vrms 1 KHz Sine Wave or play the rst track
of the Powersoft Test CD, in which case check with a
multimeter if the output signal of the cd player is 1Vrms.
Located on both top corners of the Control Board are the
Output Current Offset Trimmers, adjust them by turning
the at head screw until the yellow LEDs below turns off.
Portrayed on (Fig. 18) are the CH1, CH2 inputs, the
Output Current Offset Trimmers and the Yellow LEDs.
(Fig. 18)

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DigiMod 500 1000 1500 2000HV 1000NPS | SERVICE MANUAL
INDEX
9. SIlpad Replacement Procedure
IS000040 ULTRASOFT 18x30 mm IS000031 HI-FLOW 40x55 mm
Once the repair procedure has been ultimated, replace all silpads.
Remove any residue of dirt, glue or dust that might have been
trapped in the module.
The following images portray where to place the IS000040 Silpad.
DigiMod 1000NPS DigiMod 500, 1000, 1500, 2000HV
When replacing the IS000031 SilPad, clean all the components
and the heatsink prior to tightening te retainer springs in place.