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[Console Repair/Mod Center / Duo Monitor - Capacitor C528 capacitance value]

Hi,

First of all, sorry for mostly posting requests for support on this forum.

I've acquired a non-functioning Duo Monitor that I'm trying to fix.
When I've opened the device I've found that unfortunately someone else has already had a go at trying to fix it by replacing some electrolytic caps with ceramic caps - not a good sign.
I have noticed that the capacitor C528 is missing.
I have tried to find info on the capacitor value online, but to no avail (console5 has a list of the electrolytic capacitors on the device, but some of them are missing, like C528 - link )
There is a post on a repair webpage by "grogory" ( link ) where he has some pictures of the disassembly. In a couple of them you can see the capacitor itself, but the values are unclear to me.
Here are some pics with the C528 cap highlighted:


I can see that the rated voltage is 50V, but I am in doubt if the capacitance is either 2.2uF or 22uF.

If you have any idea for the value of that capacitor, please let me know.

Thanks in advance!

[Console Repair/Mod Center / Re: PC Engine ROM2AMP (AMP-30) Capacitor map]

In addition to the cap map, I want to say that if you have the loudspeakers that came with it and they don't sound good, there's a solution:
If you remove the metal mesh in front (a sharp object through it and some gentle leverage might do the trick) you will discover 4 screws that hold the 2 parts of the case together.
Inside, there is a standard 4-inch loudspeaker with a square support plate.
The speaker itself has 8 ohms and rated at 15W max
Space in the case is relatively tight: the loudspeaker is 6cm tall, and I'm not sure if any size bigger than that might fit
In any case it should be easy to find a replacement, de-solder, and re-solder the new part

Hope it helps!

[Console Repair/Mod Center / PC Engine ROM2AMP (AMP-30) Capacitor map]

Hi,

I recently got a PC Engine ROM2AMP accessory as I have seen it produces a nice sound, and I like the design a lot!

I am preventively replacing the caps, so I have created a capacitor chart.

It is based on the image uploaded by user thearthur777 on reddit ( https://www.reddit.com/r/TurboGrafx/comments/1e8uclk/pc_engine_amp30_capacitor_replacement_chart/ )
There is a discrepancy on one capacitor between their capacitor list and my unit.

Maybe my board is a different revision, but given the low sales of this accessory I doubt that there's more than one revision. So, I think the best would be for everyone to verify all their cap values before any de-soldering.

Capacitor map and table:

Item	Capacitance (uF)	Voltage (V)
C103	2,2	50
C104	2,2	50
C107	0,33	50
C108	0,33	50
C109	47	50
C110	47	50
C111	100	10
C112	100	10
C125	22	25
C126	22	25
C201	10	63
C202	100	10
C203	4,7	50
C204	47	10
C205	100	63
C206	1000	35
C301	10	50
C302	10	50
C305	10	50
C306	10	50
C307	22	25
C403	4,7	50
C404	4,7	50
C407	10	50
C409	4,7	50
C411	10	50
C412	4,7	50
C413	10	50
C415	47	25
C416	10	50
C417	10	50
C418	10	50
C501	1	50
C502	10	50
C505	47	10
C506	10	50
C509	4,7	50
C512	10	50
C515	1	50
C601	4700	35
C602	4700	35
C605	220	35
C606	220	35
C607	100	16
C608	100	16
C609	100	10

Then, the usual disclaimer that I am not responsible of any possible negative impact on your console following the information shared.

And finally, if there is any error, please let me know for correction.


Thanks to this forum for the support!

[Console Repair/Mod Center / PC-FX Capacitor maps]

Hi,

Keeping my promise from the previous thread, I am posting the capacitor maps from my PC-FX

Link to my previous post: https://www.pcengine-fx.com/forums/index.php?msg=522315

You will find board sketches to identify capacitors, then a table with their values.

PSU board:
             

Board	Item	Capacitance (uF)	Voltage (V)
PSU	C10	1000	16
PSU	C11	100	16
PSU	C12	1000	10
PSU	C13	1000	10
PSU	C14	470	10
PSU	C15	1	50
PSU	C2	270	200

PWA board:
             

Board	Item	Capacitance (uF)	Voltage (V)
PWA	C101	47	25
PWA	C102	100	10
PWA	C103	100	10
PWA	C105	10	50
PWA	C107	10	50
PWA	C126	0.47	50
PWA	C129	1	50
PWA	C132	3.3	50
PWA	C137	10	50
PWA	C142	47	25
PWA	C150	22	25
PWA	C152	4.7	50
PWA	C158	EMPTY	-
PWA	C180	22	25
PWA	C202	10	50
PWA	C206	10	50
PWA	C304	470	16
PWA	C305	470	6.3
PWA	C307	100	10
PWA	C313	100	10
PWA	C401	100	10
PWA	C407	EMPTY	-
PWA	C415	EMPTY	-
PWA	C418	47	25
PWA	C419	47	25
PWA	C425	EMPTY	-
PWA	C429	47	25
PWA	C431	EMPTY	-
PWA	C432	EMPTY	-

PWH board:
             

Board	Item	Capacitance (uF)	Voltage (V)
PWH	C1413	100	16
PWH	C210	EMPTY	-
PWH	C2906	22	16
PWH	C2907	10	16
PWH	C2909	100	16
PWH	C2910	47	16
PWH	C3504	EMPTY	-
PWH	C3505	EMPTY	-
PWH	C408	47	16
PWH	C409	47	16
PWH	C522	33	16
PWH	C524	33	16
PWH	C602	100	16
PWH	C704	100	25
PWH	C707	10	16
PWH	C715	22	35
PWH	C717	10	16
PWH	C718	10	16
PWH	C721	22	35
PWH	C728	10	16
PWH	C731	22	35
PWH	C741	33	16
PWH	C742	33	16
PWH	C743	10	16
PWH	C744	10	16
PWH	C901	47	16
PWH	C907	47	16
PWH	C910	220	16
PWH	C911	220	16
PWH	C912	220	16
PWH	C916	47	25
PWH	C928	47	16

Then, the usual disclamer that I am not respponsible of any possible negative imapct on your console following the information shared.

And finally, if there is any error, please let me know for correction


Thank you to this forum for the support!

[Console Repair/Mod Center / Re: PC-FX PSU resistor indexing]

Hi @NightWolve,

Thank you very much for your quick, comprehensive, and useful reply!!
Thanks as well fpr fixing my image links

I want to comment on a couple of the points you raised:
The Plan Bs:

• Unfortunately it seems that Will is going through a rough patch and the products as his store are unavailable. I hope he can overcome these hard times soon!
• Thanks for the PC-FX universal PSU! if this resistor indexing doesn't work I may follow that route

High-res images & video
These resources have been super useful! By combining them I ting I've been able to map out all the resistors in my PSU correctly (not only the disintegrated ones)

In case anyone in the future is found in a similar situation as I, here's a table I hope would be useful:

Item	Nominal value (Ohm)	Tolerance	Same among 2 PSUs?	Number of rings	1st	2nd	3rd	4th	Tolerance
R1	470	+/-5	O	4	Yellow	Violet	Yellow	--	Gold
R2	150	+/-5	?	4	Brown	Green	Yellow	--	Gold
R3	150	+/-5	?	4	Brown	Green	Yellow	--	Gold
R4	47	2W	?	--
R5	33	330J/1W	?	--
R6	33	330J/1W	?	--
R7	1500	+/-5	?	4	Brown	Green	Red	--	Gold
R8	EMPTY
R9	EMPTY
R10	330	+/-5	O	4	Orange	Orange	Brown	--	Gold
R11	12	+/-5	O	4	Brown	Black	Red	--	Gold
R12	2200	+/-5	O	4	Red	Red	Red	--	Gold
R13	110	+/-1	?	5	Brown	Brown	Black	Brown	Gold
R14	--		?
R15	820	+/-5	O	4	Grey	Red	Brown	--	Gold
R16	560	+/-5	O	4	Green	Blue	Brown	--	Gold
R17	220	+/-5	O	4	Red	Red	Brown	--	Gold
R18	--		?
R19	680	+/-5	?	4	Blue	Grey	Brown	--	Gold
R20	82	+/-5	O	4	Grey	Red	Black	--	Gold
R21	15	+/-5	O	4	Brown	Green	Black	--	Gold
R22	2700	+/-5	O	4	Red	Violet	Red	--	Gold
R23	4700	+/-5	O	4	Yellow	Violet	Red	--	Gold
R24	26800	+/-1	O	5	Red	Blue	Grey	Red	Brown
R25	4300	+/-1	O	5	Yellow	Orange	Black	Brown	Brown
R26	10000	+/-5	O	4	Brown	Black	Orange	--	Gold

I misI will order the resistors I need + 1 0.47uF capacitor I missed on the PWA board.
Other than that, the rest of the console is already recaped:



I believe someone online was asking for a cap map on the PC-FX, I will do it as well.

I will keep you updated on the progress on the console, thanks again!

[Console Repair/Mod Center / PC-FX PSU resistor indexing]

Hi,

I've recently acquired a non-functional NEC PC-FX console and I'm trying to fix it
First actions are cleaning the components and replacing all the caps in the console (cap maps found online)
None of the caps on the PWA & PWH boards were leaky, and that gives me hope to continue with the project!

My blocking point is the PSU: the Tamura TK-MF5, 2P-P1-2316
All the caps on the board were leaky and corrosion spreaded all over the board (especially on the right area):


 Since I couldn't find any PSU replacements available at the moment, I've decided to try to fix it I've removed caps, transformer, transistors and heat sinks to give the board and these elements a thorough clean After removing A LOT of corrosion, the board is now looking as this:


The problem is that the corrosion attacked a number of resistors so heavily that the color coding was unreadable, and some of them were completely gone even Now I need to find replacements for items whose resistance I don't know I have tried to find any schematics or info online, but I couldn't find anything

So, I am asking if anyone that has a PC-FX console could check if they have a similar PSU, and could let me know the color codes or the ohm values of the following thirteen resistors (circled on this pic):


    R10
    R12
    R13
    R15
    R16
    R17
    R19
    R20
    R22
    R23
    R24
    R25
    R26

I understand that this is a very specific request, so if you can redirect me to some sources or any other help would also be greatly appreciated!
Thanks!

PC-FX PSU