专注于厨房电器智能控制器的研发和制造 查看全部

What problems often occur in the use of PCB?

浏览次数 : 809
更新时间 : 2020-07-10 17:23:59
1. Degreasing (temperature 60-65℃)
(1), there are many bubbles: abnormal quality caused by more bubbles: it will lead to poor degreasing effect, reason: caused by mismatched tank liquid.
(2). Particulate matter composition: Particulate matter composition Cause: The filter is broken or the high-pressure water washing of the grinder is insufficient, and the outside brings dust.
(3) Fingerprint degreasing will not fall off: Fingerprint degreasing will not fall off Cause: Degreasing temperature bottom, mismatched syrup.
2. Micro-etching (NPS 80-120G/L H2SO4 5% temperature 25-35℃)
(1). The copper surface of the board is slightly white: the reason is the grinding of the board, insufficient oil removal or pollution, and the concentration of the medicine is low.
(2) The copper surface of the board is black: after degreasing, the water is not cleaned and is contaminated by degreasing. The pink surface of copper is the normal effect of micro-etching.
3. Activation (the color of the bath liquid is black, the temperature should not exceed 38℃, and it cannot be pumped up)
(1) Precipitation and clarification of the bath liquid:
Reasons for precipitation in the bath:
① The concentration of supplemented with water immediately changes, and the content is low (the normal supplementary liquid level should be prepreg)
②Sn2+ concentration is low, Cl- content is low, and the temperature is too high.
③Contaminated by Fe+.
(2) A silver-white film appears on the surface of the potion:
A silver-white film appeared on the surface of the potion. The cause: oxides produced by Pd oxidation.
4. Speed up (processing time 1-2 minutes temperature 60-65℃)
(1). The hole has no copper: Cause: The acceleration treatment time is too long, and Pd is removed at the same time as Sn is removed.
(2) High temperature Pd is easy to fall off.
5. The chemical liquid in the chemical copper cylinder is contaminated
Reasons for the contamination of the chemical liquid: (1), insufficient water washing before PTH (2), Pd water brought into the copper cylinder (3), there is a board to drop the cylinder (4), long-term no explosion cylinder (5), insufficient filtration
Cylinder washing: Soak in 10% H2SO4 for 4 hours, then neutralize with 10% NAOH, and finally clean with water.
6. The hole wall cannot sink on copper
Reasons: (1), poor degreasing effect (2), insufficient slag removal (3), excessive slag removal
7. The hole copper is separated from the hole wall after thermal shock
Reasons: (1), bad slag removal (2), poor water absorption of the substrate
8. Strips of water ripples on the surface
Reasons: (1), irrational design of the hanger (2), excessive stirring in the copper sink (3), insufficient washing after acceleration
9. Temperature of chemical copper liquid
Excessive temperature will cause the chemical copper solution to decompose quickly, and the composition of the solution will change to affect the quality of the electroless copper plating. High temperature will also produce a lot of copper powder, causing copper particles in the board surface and holes. Generally controlled at about 25-35℃.
关联 新闻
初学者指南:了解和使用洗衣机的控制面板
Nov .29.2023
欢迎来到我们掌握洗衣机控制面板的初学者指南。无论您是刚刚购买了第一台洗衣机还是希望从现有型号中获得更多,了解控制面板是高效洗衣的关键。
从专家的角度来看:选择烤箱控制板供应商时的五大考虑因素
从专家的角度来看:选择烤箱控制板供应商时的五大考虑因素
Nov .27.2023
在竞争激烈的家电制造业中,选择合适的烤箱控制板供应商至关重要。这不仅仅是满足你当前的需求,而是与一个可以推动你的产品走向未来的合作伙伴保持一致。
如何测试烤箱控制板
如何测试烤箱控制板
Jul .13.2023
烤箱控制板是烤箱的大脑。 它控制烤箱的所有功能,从温度调节到定时器设置。 如果您的烤箱无法正常工作,可能是由于控制板故障造成的。
燃气灶控制板:知识点
燃气灶控制板:知识点
Jun .29.2023
燃气烤箱控制板是任何燃气烤箱的关键组件。 它负责控制烤箱的温度,以及各种烹饪功能。 如果控制板出现故障,烤箱可能无法正常加热,或者根本无法工作。
pop_close
pop_main
在下方订阅颖控®了解更多信息