hotrod
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hotrod [2023/02/15 13:43] – wadmin | hotrod [2023/02/15 15:48] – [Replace power capacitors] wadmin | ||
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===== Bugfix #3 - Refresh soldering ===== | ===== Bugfix #3 - Refresh soldering ===== | ||
+ | HotRod' | ||
==== Rework solder joints ==== | ==== Rework solder joints ==== | ||
- | Ineresting | + | Inspect PCB and look for suspicious |
- | 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 ==== | ||
+ | |||
+ | Strengthen | ||
+ | |||
+ | {{drawio> | ||
+ | //Example of HotRod' | ||
+ | |||
+ | Simply scratch the varnish over tracks using a sharp knife to reveal raw track copper, clean with alcohol/ | ||
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==== Replace power capacitors ==== | ==== Replace power capacitors ==== | ||
- | Aging components should be replaced. | + | If your main power capacitors are from the IC brand, generally shipped in light grey as shown below, they are low quality chinese capacitors which are prone to leak, seriously reducing amp performance. |
+ | Consider replacing them with same value/ | ||
+ | {{drawio> | ||
==== 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> | ||
---- | ---- |
hotrod.txt · Last modified: 2023/02/15 16:01 by wadmin