描述

CQM1H-CPU21

通常一台设备里面有许多个电路板维修，当拿到一部有故障的电路板维修的设备时，首先要根据故障现象，判断出故障的大体部位，然后通过测量，把故障的可能部位逐步缩小，最后找到故障所在。要找到故障所在必须通过检测，通常修理人员都采用测引脚电压方法来判断，但这只能判断出故障的大致部位，而且有的引脚反应不灵敏，甚至有的没有什么反应。就是在电压偏离的情况下，也包含外围元件损坏的因素，还必须将集成块内部故障与外围故障严格区别开来，因此单靠某一种方法对电路板维修是很难检测的，必须依赖综合的检测手段。

现以汇能IC在线维修测试仪检测为例，介绍其具体方法。我们都知道，集成块使用时，总有一个引脚与印制电路板上的“地”线是焊通的，在电路中称之为接地脚。由于电路板维修内部都采用直接耦合，因此，集成块的其它引脚与接地脚之间都存在着确定的直流电阻，这种确定的直流电阻称为该脚内部等效直流电阻，简称R内。当我们拿到一块新的集成块时，可通过用万用表测量各引脚的内部等效直流电阻来判断其好坏，若各引脚的内部等效电阻R内与标准值相符，说明这块集成块是好的，反之若与标准值相差过大，说明集成块内部损坏。

测量时有一点必须注意，由于集成块内部有大量的三极管，二极管等非线性元件，在测量中单测得一个阻值还不能判断其好坏，必须互换表笔再测一次，获得正反向两个阻值。只有当R内正反向阻值都符合标准，才能断定该集成块完好。在实际修理中，通常采用在路测量。先测量其引脚电压，如果电压异常，可断开引脚连线测接线端电压，以判断电压变化是外围元件引起，还是集成块内部引起。也可以采用测外部电路到地之间的直流等效电阻(称R外)来判断，通常在电路中测得的集成块某引脚与接地脚之间的直流电阻(在路电阻)，实际是R内与R外并联的总直流等效电阻。在修理中常将在路电压与在路电阻的测量方法结合使用。有时在路电压和在路电阻偏离标准值，并不一定是集成块损坏，而是有关外围元件损坏，使R外不正常，从而造成在路电压和在路电阻的异常。这时便只能测量集成块内部直流等效电阻，才能判定集成块是否损坏。

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Fuji VME bus VM1220 with 8 ot of 16 chips

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FUJI SHARP VME BUS VISION VIDEO MODULE VM1610

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Perceptron Frame Grabber Board 495-0191 #29402

Perceptron Frame Grabber Board 495-0191-00 #29410

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Astex-5254 Continuous Fusing System.

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APPLIED MATERIALS – 0190-09265 – ASTEX, OZONATOR WAVE

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ASTeX MKS GENERATOR OZONE SEMOZON 14-6008-00 90.2 XP

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ASTEX AX2050-3 MICROWAVE POWER GENERATOR 90DAY WARR

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PERCEPTRON 911-0008 USPP 9110008

PERCEPTRON 911-0018 USPP 9110018

PERCEPTRON 9110017 USPP 9110017

PERCEPTRON 911-0011 USPP 9110011

PERCEPTRON 9110014 USPP 9110014

PERCEPTRON 912-0013 USPP 9120013

PERCEPTRON 911-0010 USPP 9110010

PERCEPTRON 912-0007 USPP 9120007

PERCEPTRON 912-0010 USPP 9120010

PERCEPTRON 912-0011 USPP 9120011

PERCEPTRON 912-0020 USPP 9120020

PERCEPTRON 912-0021 USPP 9120021

PERCEPTRON 911-0004 USPP 9110004

PERCEPTRON 911-0007 USPP 9110007

PERCEPTRON 912-0008 USPP 9120008

PERCEPTRON 911-0052 USPP 9110052

PERCEPTRON 911-0053 USPP 9110053

Perceptron Digital Tricam Camera Sensor 916-4101

PERCEPTRON TRICAM DIGITAL 2

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Perceptron 916-4128 Digital Contour Sensor Camera

PERCEPTRON 495-0191 USPP 4950191

PERCEPTRON CAMERA TRICAM SURFACE SENSOR 912-0014

PERCEPTRON CAMERA TRICAM CONTOUR SENSOR 911-0007

PERCEPTRON CAMERA TRICAM SURFACE SENSOR 912-0007

PERCEPTRON CAMERA TRICAM SURFACE SENSOR 912-0015

PERCEPTRON CAMERA TRICAM SURFACE SENSOR 912-0017

Perceptron Processor Board 495-0191 Frame Grabber 29400

Perceptron Frame Grabber Board 495-0191 #29401

Perceptron Frame Grabber Board 495-0191 #29402

Perceptron Frame Grabber Board 495-0191-00 #29410

Perceptron DSP Frame Grabber 495-0191 96K #29411

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CQM1H-CPU21

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