hotrod
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hotrod [2023/02/15 14:33] – [Rework solder joints] wadmin | hotrod [2023/02/15 15:41] – wadmin | ||
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===== Bugfix #3 - Refresh soldering ===== | ===== Bugfix #3 - Refresh soldering ===== | ||
+ | HotRod' | ||
==== Rework solder joints ==== | ==== Rework solder joints ==== | ||
Inspect PCB and look for suspicious solder joints as per those detailed here https:// | Inspect PCB and look for suspicious solder joints as per those detailed here https:// | ||
- | On Critical heating components, | + | You want to investigate in priority the following components: |
- | on Capacitors | + | |
- | Strengthen PCB tracks, | + | === Critical heating components |
+ | |||
+ | * **Low voltage power resistors R78 and R79** can get really hot and their solder joints are stressed a lot. Inspect these first. | ||
+ | {{drawio> | ||
+ | |||
+ | * **Footswitch cricuit R97** is a good candidate too. Heats a lot. | ||
+ | {{drawio> | ||
+ | |||
+ | * Inspect all polarisation resistors in PCB, especially R4, R11, R16, R57, R58, R61, R62, and eventually power resistors R74 and R75. | ||
+ | |||
+ | === Capacitors | ||
+ | |||
+ | * power capacitors C31, C33, C35, C36, C40, C41 are large capacitors on which vibrations tend to stress solder joints. Inspect and rework them if needed. | ||
+ | {{drawio> | ||
==== Apply solder paste on weakened tracks ==== | ==== Apply solder paste on weakened tracks ==== | ||
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{{drawio> | {{drawio> | ||
- | //Example of HotRod' | + | //Example of HotRod' |
Simply scratch the varnish over tracks using a sharp knife to reveal raw track copper, clean with alcohol/ | Simply scratch the varnish over tracks using a sharp knife to reveal raw track copper, clean with alcohol/ | ||
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==== Replace burnt resistors ==== | ==== Replace burnt resistors ==== | ||
- | Install stronger components for LV power stage. | + | Resistors of the low voltage part are 5W 470 Ohms, but are exposed to transients up to 4.9W (48V@470Ohms). Upgrading these to 10W 470Ohms wired resistors is encouraged. Notably, installing the resistors slightly above PCB to increase air flow is recommended. |
+ | {{drawio> | ||
---- | ---- |
hotrod.txt · Last modified: 2023/02/15 16:01 by wadmin