Author Topic: FM TOWNS 20F PSU resistor chart  (Read 598 times)

Offline mez

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FM TOWNS 20F PSU resistor chart
« on: August 29, 2016, 02:27:17 am »
Hi everyone,
I would like to change 2 resistors on a 20F PSU :
R8 and R10, l@@k picutres :)

Does anyone has the value ? the complete resistor chart or service manual please ?
thanks a lot




Offline twoquickcapri

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Re: FM TOWNS 20F PSU resistor chart
« Reply #1 on: September 17, 2016, 03:02:40 am »
I have the same problem with on of my towns PSU and I'm working on a list base off my system, the picture above and another one I found on another site. I'm somewhat sure that r10 is right but r11 is really hard to read on my PSU.

R3 = 120 kohms
R4 = 22 kohms
R5 = 47 kohms
R6 = 5.6 ohms
R7 = 560 ohms
R8 = 3.3 kohms
R9  = 10 ohms
R10 = 560 ohms (Green,Blue,Brown?)
R11 = 10 kohms (Brown,black,orange?)
R12 = 160 ohms
R13 = 1 kohm
R14 = 47 kohms
R16 = 22 kohms

Offline mez

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Re: FM TOWNS 20F PSU resistor chart
« Reply #2 on: October 12, 2016, 04:52:43 am »
hi twoquickcapri
yes i confirm :
R10 = 560 ohms
R11 = 10 kohms

Offline mez

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Re: FM TOWNS 20F PSU resistor chart
« Reply #3 on: October 16, 2016, 01:15:45 am »
FM TOWNS 20F just repaired !

Offline famiac

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Re: FM TOWNS 20F PSU resistor chart
« Reply #4 on: February 09, 2017, 11:13:52 am »
how did you figure the resistors went bad? just multimeter testing?

Offline mez

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Re: FM TOWNS 20F PSU resistor chart
« Reply #5 on: February 09, 2017, 11:21:57 pm »
first visually looking bad, see photos
and after yes multimeter