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Topic:
Replacing Fuse in TSU6000 docking station
This thread has 20 replies. Displaying posts 1 through 15.
Post 1 made on Wednesday April 6, 2005 at 15:25
tyrrp
Long Time Member
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August 2003
76
My docking station seems to be broken. I have tested the transformer and it is working fine. My next port of call is replacing the fuse but I have a few questions first. I live in Ireland but have a US tsu6000.

1. From the forums I have found that the fuse has the following on it:-
bel Ĺ A
MS 125V
T500mA

Is this an acceptable replacement that I found on the Irish Radionics site ([Link: radionics.ie]
Description Fuse, F, submin, PCB, axial leaded, fast acting, 125Vac, 500mA
RS Stock No. 422-034
Manufacturer LITTELFUSE
Part No. 251.500HAT1

If not then were can I get the right one.

2. What size Torque bit do I need to open the dock.

3. Can I do this easily myself. I have a soldering iron and a solder sucker. Is there any danger of me damaging other parts of the board.


Before I do this is there anything else I should try first. The battery is getting low (3 bars) but when I put it on the dock the Low Power symbol starts to flash. Is this normal.
Post 2 made on Wednesday April 6, 2005 at 21:22
Lyndel McGee
RC Moderator
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12,825
1. You can get the same fuse from Digi-Key. Search for Digi-Key in this forum for the past 1 year. This is a carbon axial lead slow-blow fuse.

2. Torx #6

3. Yes, you can do it easily. Just be sure to watch the ribbon cables as they are thin mylar. I'll warn you though that there are about 6 clips around the edges of the DS that are a real pain in the ass to get loose just to get the thing open. Don't rip the thing apart or you risk damaging the cables..

However, if you are careful, you can do it quite easily. There are 4 T6 screws. One is underneath each rubber pad.
Lyndel McGee
Philips Pronto Addict/Beta Tester
OP | Post 3 made on Thursday April 7, 2005 at 05:05
tyrrp
Long Time Member
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76
I have had a look and even went to the bel site but there doesn't seem to be the exact same fuse.

Anyone have a part number
Post 4 made on Thursday April 7, 2005 at 07:00
Mark Nolan
Founding Member
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July 2001
106

I assume you have checked that the 251 is the right form-factor. If so, then it is likely to be the 471 series (time lag) or the 473 series (slo-blo). Usually, the T indicates a time lag, but if Lyndel says it is slo-blo then I would be inclined to go with him.

You can see pictures of littelfuse fuses at their website (www.littelfuse.com), which should help. You could then match the serial number at Radionics, because I can see how shipping just a fuse from the US may seem excessive.
OP | Post 5 made on Thursday April 7, 2005 at 11:01
tyrrp
Long Time Member
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76
I have worked out that the Littelfuse 473.500 is the closest to what I am looking for.

These are the details on the radionics site:-

Fuse, T, submin, PCB, axial, leaded, time delay, 125Vac/dc, 500mA
RS Stock No. 419-319
Manufacturer LITTELFUSE
Part No. 473.500HAT1

The date sheet shows all the set points as almost the same and the physical size is the exact same as the BEL. So I have ordered some. I will let you all know how is goes and the steps I go through.

Fingers crossed.
OP | Post 6 made on Monday April 11, 2005 at 15:30
tyrrp
Long Time Member
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76
Right. I have come across a problem.

Got the new fuses today. Opened the docking station. Found the fuse and removed it. Looked at the fuse and guess what. The fuse is not what the others have been telling me. It is a:-

bel 3/4a
MS 125A
T750mA

What is the story. Have they changed the fuse. The T750mA is marked on the board so the board must be different as well.

Obviously I should use the same fuse but it seems a bit strange that no body else has come across this before.
Post 7 made on Monday April 11, 2005 at 15:56
bomberjim
Super Member
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3,894
As you say, seems a little strange nobody else has mentioned it. As a guess, I'd say that at some point, they increased the fuze size to cut down on the number of failed chargers having to be repaired under warrentee. I also suspect that the current differential between the 2 fuzes was deemed neither dangerous or critical, and would imagine that you could use either one. Of course, you would expect that the 500 ma fuze would be more likely to fail sooner, even with all design and operating specs in tolerence.

As an aside, my Marantz charger failed after about 2 and a half years. I was pretty sure it was the fuze, but with a 3 year warrantee, I let Marantz repair/replace without doing it myself. If a larger fuze had been installed, it might not have failed.
Jim L
OP | Post 8 made on Tuesday April 12, 2005 at 04:32
tyrrp
Long Time Member
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August 2003
76
Right. Can't find a 750mA fuse in Ireland. So I am going to try and order from the States but in the meantime I think I will install the 500mA anyway. It's lower rated so now damage can be done so it's worth a try.
OP | Post 9 made on Monday April 18, 2005 at 05:10
tyrrp
Long Time Member
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August 2003
76
Well replaced the 750mA with a 500mA because the only place that can get me the 750 has a minimum order of 3000.

Everthing is working fine for now and I have 10 of the 500mA so if they blow I can replace them easily.

I broke a couple of the clips when opening the station and since the two parts are screwed together anyway I decided to break the rest to make future access easier.
Post 10 made on Saturday April 15, 2006 at 03:40
formatter
Lurking Member
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April 2006
1
Hi , did you test the blown fuse with a multimeter ? I think I have blown the fuse in my docking station. I cannot charge the pronto and no lights come on when I place it in the charger . I have removed the fuse and am trying to get another one. Tandy electronics has tested it for me but wasn't sure if it was blown or not becuase it is still conducting a very slight current . I accidently reversed the polarity on the adaptor when I killed it.
Post 11 made on Saturday April 15, 2006 at 13:29
Lyndel McGee
RC Moderator
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12,825
With a multimeter set to measure resistance (ohms) the fuse may still show some conduction of current. However, a good fuse will typically show less than 100 ohms resistance. Replace the fuse and it will be fine.
Lyndel McGee
Philips Pronto Addict/Beta Tester
Post 12 made on Saturday March 17, 2007 at 15:21
Andrew Potts
Long Time Member
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March 2004
26
I have this problem - a TSU7000 base that just stopped working. If I bridge the fuse in the base station, it all comes to life again.

In the absence of finding and fitting an identical fuse, would it be OK to break out with a couple of wires and fit a regular 750mA fuse?
Post 13 made on Saturday March 17, 2007 at 18:27
Lyndel McGee
RC Moderator
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12,825
Will likely work but the Bel fuse is a slow-blow ferrite core fuse and I'd recommend replacing with the 750ma Bel or equivalent fuse..
Lyndel McGee
Philips Pronto Addict/Beta Tester
Post 14 made on Monday March 19, 2007 at 07:11
Andrew Potts
Long Time Member
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March 2004
26
Lyndel - thanks. I went ahead anyway, and used an external 800mA quick blow fuse (I have a large packet of them) and no blow so far! At least now I can change the fuse without opening the dock again, and I have my Pronto back up and running. Trying to get the Bel fuse here in the UK was a bit tricky, and my fix just took a few minutes.
Post 15 made on Wednesday April 4, 2007 at 16:09
thexlr8r
Lurking Member
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Posts:
April 2007
3
hi,

ive been reading these posts after my local repair shop wasnt interested in repairing (or even looking at) my Philips TSU6000 remote/charger.

having read here, i now know exactly what the fault is. The Fuse.

In my case its completely fried :(

I like your idea of having the fuse located externally and i would be very grateful if you could post (or email me) some pics of what fuse you used and holder (if any).

many thanks.

i will get this thing working yet, lol!

peace

the xlr8r
if it aint broke...DONT FIX IT!
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