tilover
Member
Hello forum ,
i have 2 trouble makers which decided to rest on my workbench way too long .
So time for repair , but i need more info te get them going ;
- ti 59 ( and an ti58 ) suffer from internal smp powersupply fail .
the little unit does not generate the 2 negative voltages anymore .
i tried to find out the obvious ( tantaliums ) but the were fine , finally i found one broken resistor of unknown value .
so need to know what to use for the 3 transistors , and the value of that one resistor .
- pc100 ( a ? ) this is the type of which i could not find any schematics for , it is the early type with one single board
i noticed fading of the print and that ended in not printing or moving at all .
if you can help me with these oldies , highly appreciated .
regards,
tilover
![m_IMG_3009.jpg m_IMG_3009.jpg](https://forum.vcfed.org/data/attachments/65/65764-5e24c3190a6aaf70979371f66e9f9b92.jpg)
![m_IMG_2114.jpg m_IMG_2114.jpg](https://forum.vcfed.org/data/attachments/65/65765-02531dce956ef01155f13346e420f439.jpg)
![m_IMG_3019.jpg m_IMG_3019.jpg](https://forum.vcfed.org/data/attachments/65/65766-620051aa08f2e818be736e612c20307e.jpg)
i have 2 trouble makers which decided to rest on my workbench way too long .
So time for repair , but i need more info te get them going ;
- ti 59 ( and an ti58 ) suffer from internal smp powersupply fail .
the little unit does not generate the 2 negative voltages anymore .
i tried to find out the obvious ( tantaliums ) but the were fine , finally i found one broken resistor of unknown value .
so need to know what to use for the 3 transistors , and the value of that one resistor .
- pc100 ( a ? ) this is the type of which i could not find any schematics for , it is the early type with one single board
i noticed fading of the print and that ended in not printing or moving at all .
if you can help me with these oldies , highly appreciated .
regards,
tilover
![m_IMG_3009.jpg m_IMG_3009.jpg](https://forum.vcfed.org/data/attachments/65/65764-5e24c3190a6aaf70979371f66e9f9b92.jpg)
![m_IMG_2114.jpg m_IMG_2114.jpg](https://forum.vcfed.org/data/attachments/65/65765-02531dce956ef01155f13346e420f439.jpg)
![m_IMG_3019.jpg m_IMG_3019.jpg](https://forum.vcfed.org/data/attachments/65/65766-620051aa08f2e818be736e612c20307e.jpg)