hotrod
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hotrod [2023/02/15 14:45] – [Rework solder joints] wadmin | hotrod [2023/02/15 15:43] – [Replace burnt resistors] wadmin | ||
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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:// | ||
- | You want to investigate the following components: | + | You want to investigate |
=== Critical heating components === | === Critical heating components === | ||
- | * Low voltage power resistors | + | |
- | on Capacitors (listing), | + | * **Low voltage power resistors |
- | Strengthen | + | {{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 R78 and R79 of the low voltage part are 5W 470 Ohms, but are exposed to transients up to 4.9W (48V@470Ohms). Upgrading these to higher quality 10W wired resistors is encouraged. Notably, installing the resistors slightly above PCB to increase air flow is recommended. |
+ | {{drawio> | ||
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hotrod.txt · Last modified: 2023/02/15 16:01 by wadmin