Powersoft D-Cell 504 Manuale utente

powersoft_DCell504_servman_en_v1.2

service manual

D-Cell 504

REV 1.2 June 2013

Page intentionally left blank

D-Cell 504

Service manual

Table of contents

1 Important safety instructions 3

2 Tools 3

3 Disassembly the power supply 4

4 Disassembly the amplier board 4

5 Assembly outline

D-Cell 504 power supplies 5

6 Assembly outline

D-Cell 504 amplier board 6

7 Checking the power supply 7

8 Failure of the varistor 7

9 Failure of the inductor 8

10 Checkng the output stage 8

11 Failure of the MOSFETs 9

12 Further tests 9

13 Spare part list 10

D-Cell 504 10

1 Important safety instructions

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

This technical document is aimed to be a support guide in

solving the most recurrent failures of the D-Cell504 amplier

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 in red print

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.

2 Tools

fPhillips PH 0 screwdriver.

fPhillips PH 1 screwdriver.

fSmall cutter

fTweezers

fFunction generator or test CD + CD player.

fDouble trace oscilloscope (it must be disconnected from the

ground) and probes.

fMultimeter.

fSoldering station.

fMains insulation transformer/variac.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

3 Disassembly the power supply

1. Remove the six top cover xing screws

2. Carefully remove the PSU board from the heat

sink

4 Disassembly the amplier board

1. Remove the six top cover xing screws

2. Carefully remove the PSU board from the heat

sink

FIGURE 1: DC Power supply: remove six screws.

FIGURE 2: AC Power supply: remove six screws.

FIGURE 3: D-Cell 504 amplier board: remove six screws.

5 Assembly outline D-Cell 504 power supplies

FIGURE 4: D-Cell 504 AC power supply.

FIGURE 5: D-Cell 504 DC power supply.

6 Assembly outline D-Cell 504 amplier board

FIGURE 6: D-Cell 504 amplier board - Top view.

FIGURE 7: D-Cell 504 amplier board - Bottom view.

7 Checking the power supply

Evidence of a fault in the power supply stage is a

blown main fuse (located close to the main switch).

Before replacing it, check if the protection varistor is

also blown. If not, disassemble the power supply board

from the chassis and check all components as illustrated

in the following paragraphs.

If the protection varistor is blown, move on to the

next step regarding the varistor issue

8 Failure of the varistor

A varistor RV1 short circuit, resulting in its

permanent damage, can occur if a mains voltage higher

than 250VAC is applied to the D-Cell PSU. In this case

the main fuse is also always blown.

1. Components to be replaced:

fRV1 varistor

fF1 Fuse

We recommend anchoring the varistor with

silicone glue to the nearest capacitor.

FIGURE 8: Fuse.

FIGURE 9: Fuse on PCB.

9 Failure of the inductor

If the 47 µH inductor in position L835T should

fail, please replace it with a new inductor of the same

nominal value but with a maximum current tolerated

of 1.3 A. This specic power supply fault is present in

rst series power supplies equipped with inductors

with an inadequate maximum current tolerance.

1. Components to be replaced:

f47 µH inductor

We recommend securing the inductor to the

body of the coil with silicone.

10 Checkng the output stage

Hold the probes of a multimeter on the two fuses

in the secondary stage of the power supply, F800T and

F8001T. Then check in the AMP stage which of the

two channels has at least one MOSFET with the drain-

source junction short circuited

FIGURE 10: L825T inductor.

FIGURE 11: L825T inductor position on the PCB.

FIGURE 12: Output fuses on the PCB.

11 Failure of the MOSFETs

1. The MOSFETs are located on the bottom side of

the amplier’s PCB.

2. Components to be replaced:

fChannel 1 MOSFETs Q200, Q201

fChannel 2 MOSFETs Q500, Q501

We recommend to carefully position the Sil-Pads to

ensure the proper heat exchange between the com-

ponents and the chassis.

12 Further tests

1. After checking and replacing all the defective

components, try to test the module applying an

incremental voltage through a variac.

2. Connect the probes of your multimeter to the

CN800T connector on the power supply board;

with respect to ground:

fon pins 1 to 4 sense +VCC,

fon pins 12 to 16 sense –VCC.

3. The unit should start to work at about 90 VAC. The

Rail voltages ±VCC must be about ±40VDC.

FIGURE 14: MOSFETs.

FIGURE 13: Output MOSFETs on the bottom side of the PCB.

13 Spare part list

D-Cell 504

Powersoft

code Description Position

FU000020 Fuse 3.15A 250VDc (5x20mm) Fast

CF Series Main switch

VR000006 VARISTOR S20K300 RV800T

LI000015 PTVA 47UH 1.3A H=14mm

D=9.4mm L835T

FUS00001 FUSE 10A 6.1mmx2.69mm FAST F

serie451 LITTELFUSE F800T, F801T

MO000043 IRC IRFB5615PBF

150V/25A/32mOhm Q200, Q201,

Q500, Q501

IS000042 GAP PAD ULTRASOFT 40MILS

18X50 DIGIMOD Q200, Q201,

Q500, Q501

Indice

Altri manuali powersoft Amplificatore

powersoft

powersoft M30D Manuale utente

powersoft

powersoft M30D Manuale utente

powersoft

powersoft Mezzo Series Manuale utente

powersoft

powersoft X Series Supplemento

powersoft

powersoft X4 Manuale utente

powersoft

powersoft Digam K20 Manuale utente

powersoft

powersoft Ottocanali I204 DSP+ETH Manuale utente

powersoft

powersoft Ottocanali HGT Series Manuale utente

powersoft

powersoft X Series Manuale utente

powersoft

powersoft Ottocanali 4K4 Manuale utente

powersoft

powersoft DigiMod 2000HV Manuale utente

powersoft

powersoft DigiMod 3004PFC4 Manuale utente

powersoft

powersoft Mezzo Series Manuale utente

powersoft

powersoft T Series Manuale utente

powersoft

powersoft LiteMod 4HV Manuale utente

powersoft

powersoft Digimod Series Manuale utente

powersoft

powersoft M50Q Manuale utente

powersoft

powersoft QTU1400 Manuale utente

powersoft

powersoft X4 Manuale utente

powersoft

powersoft IpalMod Manuale utente

powersoft

powersoft DigiMod PFC2 Manuale utente

powersoft

powersoft X Series Manuale utente

powersoft

powersoft Duecanali 3904 Manuale utente

powersoft

powersoft K2 DSP+AESOP Manuale utente

Manuali Amplificatore popolari di altre marche

ASTRO

ASTRO HVO V40 P Manuale utente

Marantz

Marantz SUPERSCOPE BLA-545 Istruzioni per il montaggio

NAD

NAD CI980 Manuale utente

Technics

Technics SE-CH770 Manuale utente

Harman Kardon

Harman Kardon HK6300 Manuale utente

NAD

NAD T975 Manuale utente

McIntosh

McIntosh MA6850 Manuale utente

Electro-Harmonix

Electro-Harmonix ENGLISH MUFF’N Manuale utente

Viatron

Viatron Autrix Manuale utente

GME

GME GA9800 Manuale utente

Atlas

Atlas CP700 Manuale utente

Roland

Roland KC-1000 Manuale utente

Pyle

Pyle PFMRA350BW Manuale utente

Advantage

Advantage S-250 Manuale utente

IRT Electronics

IRT Electronics DVA-3007 Manuale utente

Dimavery

Dimavery BA-100 Series Manuale utente

Sony

Sony XM-S400D Manuale utente

Schertler

Schertler ROY X Manuale utente

powersoft D-Cell 504 Manuale utente

Manuali Amplificatore popolari di altre marche