Powersoft D-Cell 504 User manual

powersoft_DCell504_servman_en_v1.2

service manual

D-Cell 504

REV 1.2 June 2013

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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

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