Apple Monitor IIc A2M4090Z Capacitor list

[BadGoldEagle]

Hi all

One of the AC filter capacitors in my IIc's monitor blew a couple of days ago. I downloaded the SAMS for it (it seems to be the only service manual available), but it doesn't have a capacitor reference/list. Plus my model is 240V so I very much doubt there's a list for it out there.

My monitor is not NOS, it has seen some use but I doubt it's a high hour tube. The electrolytics looked fine (no bulging) but I decided to swap them out anyway (the vertical got screwy not that long ago). I recommend getting 105C+ rated caps. Things get kinda hot in there and it'll only do those new caps a favor. Most of the ones I bought are Nichicons (some are Panasonic and others are TDK), and there are a couple non polarized caps on the main board but they were all easily obtainable.

Here's what's on the boards

1x 25V 3300uF [C701] (that's the big one with a diameter of approx 25mm)

3x 35V 10uF [C104 & C413 & C405]

2x 16V 47uF BI-POLAR / NON-POLARIZED [C107 & C102]

1x 16V 10uF BI-POLAR / NON-POLARIZED [C108]

1x 25V 10uF [C110]

1x 25V 4uF BI-POLAR / NON-POLARIZED [C515]

1x 50V 100uF [C514]

2x 16V 1000uF [C510 & C409]

1x 16V 47uF [C105]

3x 50V 4.7uF [C111 & C702 & C505]

1x 16V 100uF [C103]

1x 16V 330uF [C508]

1x 63V 100uF [C517]

2x 350V 1uF BI-POLAR / NON-POLARIZED [C513 & C518]

1x 16V 2200uF [C704]

1x 16V 470uF [couldn't read...]

1x 16V 220uF [C411]

1x 33uF [C408]

1x 250V 0.1uF X FILTER CAP (daughterboard) [replace with film capacitor]

2x 4700pF (0.0047uF) Y Filter CAP (daughterboard) [replace with film capacitor]

Here's what I recommend getting (remember that you can always go up in voltage as long as you keep the same capacitor value! This makes the list slightly shorter)

1x 25V 3300uF [C701] 

4x 35V 10uF [C104 & C413 & C405 & C110]

2x 16V 47uF BI-POLAR / NON-POLARIZED [C107 & C102]

1x 16V 10uF BI-POLAR / NON-POLARIZED [C108]

1x 25V 4uF BI-POLAR / NON-POLARIZED [C515]

3x 63V 100uF [C514 & C103 & C517]

2x 16V 1000uF [C510 & C409]

1x 16V 47uF [C105]

3x 50V 4.7uF [C111 & C702 & C505]

1x 16V 330uF [C508]

2x 350V 1uF BI-POLAR / NON-POLARIZED [C513 & C518]

1x 16V 2200uF [C704]

1x 16V 470uF [couldn't read...]

1x 16V 220uF [C411]

1x 33uF [C408]

1x 250V 0.1uF X FILTER CAP (daughterboard) [replace with film capacitor]

2x 4700pF (0.0047uF) Y Filter CAP (daughterboard) [replace with film capacitor]

Last but not least, Your Mileage May Vary. I cannot guarantee that your board has the same caps. 

Hope this helps someone!

 

[superjer2000]

I recapped my Monitor IIc a couple of weeks ago. The other thing I did was spray some contact cleaner in the contrast pot and other pots as I was having some issues when turning the dial. 

When i I got it back together I had no video and needed to sort out all of the pots again but it works great now. My filter caps were film type not Rifa so I left them alone. Thst monitor was quite the beast to disassemble!

i did my Apple Monitor II at the same time. 

Both are great displays. 

 

[BadGoldEagle]

I'll probably have to fiddle with a few pots to get a picture back too. The raster was vertically distorted towards the top. A good tune up will be in order. 

My filter caps were film type not Rifa so I left them alone.

Is your monitor a 120V unit by any chance? On the service manual, the US model is the one pictured and the filter caps are not Rifas.

Thst monitor was quite the beast to disassemble!

Yeah! It's quite painful all right. It's got so many screws of different lengths for no apparent reason too. 

 

[superjer2000]

I'll probably have to fiddle with a few pots to get a picture back too. The raster was vertically distorted towards the top. A good tune up will be in order. 

Is your monitor a 120V unit by any chance? On the service manual, the US model is the one pictured and the filter caps are not Rifas.

Yeah! It's quite painful all right. It's got so many screws of different lengths for no apparent reason too. 

Yes - 120V model.  I debated changing the filter caps anyways but decided to leave them alone. 

There are probably six or more pots that needed to be adjusted. I am sure a big part of it was my fault as when I cleaned the pots with the contact cleaner I moved them back and forth upsetting the prior settings. It was hard to reach a lot of them once the monitor was back together but I was able to contort my video adjustment tools to make it work. 

 

[Tarantulas]

Sorry to necropost, but you didn't happen to save a Mouser cart for these caps... did you?

 

[superjer2000]

Sorry to necropost, but you didn't happen to save a Mouser cart for these caps... did you?

I do have it. I keep lists of everything I recap. I'll dig it up and send it but I'm pretty sure there were difference versions of this monitor so it may not be identical.  On mine, a number of the input side caps were poly but I don't think that's the case for all of them. 

 

[Tarantulas]

I do have it. I keep lists of everything I recap. I'll dig it up and send it but I'm pretty sure there were difference versions of this monitor so it may not be identical.  On mine, a number of the input side caps were poly but I don't think that's the case for all of them. 

Here's the map I've worked up:

https://docs.google.com/spreadsheets/d/1op5-XfQ_Ai5LCzx151gmWN5TD8VsXon9Zs58AuRG7uM/edit?usp=sharing

It seems that bipolar 1uf 350v caps are impossible to find...  at least, I'm not having luck finding any.  Everything I see is 100V max.

 

[superjer2000]

Usually I'm pretty meticulous about documenting the caps I used.  I think in this case I may have only documented those I didn't already have in stock.  I'm attaching what I had noted for the Monitor IIc (and Monitor II).  Column I are the caps are ordered that I didn't already have (the oddball ones).  The remaining caps (blanks) are ones I already had on hand so I didn't document the Mouser part #.  ***Note that some of the caps are bipolar***

Hopefully this helps somewhat.  If you need any help locating the other caps, let me know as I can xref against what I likely used.

At the bottom I included the part number for the Diodes I replaced.  I had some crispy looking Diodes (see picture) that I also replaced.

View attachment Monitor IIc and Apple Monitor II.xlsx

 

[superjer2000]

I should have mentioned that for C22 I would have used this:

 667-ECW-FD2W395JB

 

[superjer2000]

OK - One last post as I reread some of the comments above regarding finding bipolar caps for C513 and C518.  On my monitor IIc, those two caps were polarized.  Apple may have made a change to the circuit to eliminate the need for bipolar caps in those locations but that's why my list specifies polarized caps.  C513 and C518 are the black caps (one inside the flyback cage and the other right beside.