需要HP 70120A操作和服务手册和CLIP

-331，自检失败;
ROM校验和失败我想它不是闪存。
在温暖的一天上车后，它出现并工作了一次。
ROM需要焊料回流的哪些提示，或哪些通孔最常损坏？
吉姆



     以下为原文

  -331, Self-test failed; ROM checksum failure

I guess it isn't flash.  It came up and worked once after being in my car on a warm day.

Any hints on which ROM needs the solder reflowed, or which via breaks most often?

Jim