964的空調系統(二)：風門步進馬達 Servo Motor

2013/01/09 12:03

964/993 的空調系統HVAC 總共有5個步進馬達，

分別控制五個風門： temperature mixing valve right/left, foot well flap, defrost flap, fresh air flap

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原先只是想要清一清 、上上油 CCU面板內的小風扇而已，CCU fan 分解步驟：

http://forums.rennlist.com/rennforums/964-1989-1994-911/687307-ccu-button-replacement.html

(鳥站說，這個不起眼的小馬達要價$308....真是貴死人不償命...)

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卻引發出5個步進馬達與風門也要清潔的問題：

http://www.bergvillfx.com/ccurepair.html

[Servo driver failure...If a servo gets stuck due to mechanical or electric failure the driver IC inside the CCU can be overheated and/or damaged.... The CCU opamps are TCA 2465.]

[如果風門因為機械或電氣故障而卡住，有可能導致CCU內的driver IC燒毀...驅動IC的編號是TCA 2465.]

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分解與清潔的步驟：http://web.archive.org/web/20081115201401/http://www.porsche964.co.uk/technical/servos.htm

附帶一提CCU小風扇在電門關閉後10~20分鐘內必須停止運轉：

[No CCU fan shutdown...

The CCU fan is supposed to stop within 10-20 minutes after ignition off....If the CCU and fan does not shut off the current drain is about 500mA. Pull Fuse #1 to check if the CCU is the item in question. The transistor controlling the power control relay can fail, it's a common BC 337 transistor. An easy fix without having to split the sandwiched PCB boards. While in there, check the two CCU front panel lights 12V 0,9W.(Porsche part# 964 641 920 00) Also clean the CCU inside air temperature sensor.....]

如果持續轉不停，有可能是驅動電晶體 BC337燒毀了，

先從這個電晶體開始檢查/更換，會是比較省錢的起點，

之後是air temperature sensor與5個servo motor/flap 的清潔工作。

HVAC 問題討論：http://www.bergvillfx.com/porschehvac1.html