FM Towns:Tower Power Supply Repair and Capacitor list: Difference between revisions

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'''As a result of this, the acid leaks sideways down the card and destroys a lot of resistors, the relay, etc.  It is uncommon to clean, recap, and then the PSU card dies months later.'''<br>
'''As a result of this, the acid leaks sideways down the card and destroys a lot of resistors, the relay, etc.  It is uncommon to clean, recap, and then the PSU card dies months later.'''<br>
Hearing a whining sound when the computer is plugged in and not turned on is an indicator that the capacitor near the black relay has leaked badly.<br>
Hearing a whining sound when the computer is plugged in and not turned on is an indicator that the capacitor near the black relay has leaked badly.<br>
{| class="wikitable"
|+ Gen 1 Card
|-
! Capacitor !! Microfarad !! Voltage
|-
|C6 || 560uF || 180v
|-
|C12 || 47uF || 50v
|-
|C52 || 560uF || 25v
|-
|C54 || 220uF || 25v
|-
|C55 || 220uF || 25v
|-
|C57 || 2200uF || 10v
|-
|C58 || 820uF || 10v
|-
|C60 || 220uF || 50v
|-
|C70 || 22uF || 25v
|-
|C74 || 22uF || 25v
|-
|C75 || 22uF || 25v
|-
|C84 || 1uF|| 50v
|}

Revision as of 01:05, 13 August 2022

The Generation 1 Power Supply

Generation 1 PSU card.


This power supply is not known to be a tremendous source of pain to maintain.
However, it is sideways just like the Gen 2/3/4 cards.

The Generation 2/3/4 Power Supply

Look in the red boxes. Large failure points. Resistors and tantalum capacitors near these areas also like to break.


Very well known and the pain these cause is also well known. This PSU card is sideways like the Gen1 card.
As a result of this, the acid leaks sideways down the card and destroys a lot of resistors, the relay, etc. It is uncommon to clean, recap, and then the PSU card dies months later.
Hearing a whining sound when the computer is plugged in and not turned on is an indicator that the capacitor near the black relay has leaked badly.


Gen 1 Card
Capacitor Microfarad Voltage
C6 560uF 180v
C12 47uF 50v
C52 560uF 25v
C54 220uF 25v
C55 220uF 25v
C57 2200uF 10v
C58 820uF 10v
C60 220uF 50v
C70 22uF 25v
C74 22uF 25v
C75 22uF 25v
C84 1uF 50v
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