Author Topic: Tek 2232 horizontal image distorted, turned out to be a simple repair [Solved]  (Read 1030 times)

0 Members and 1 Guest are viewing this topic.

Offline SatbeginnerTopic starter

  • Regular Contributor
  • *
  • Posts: 151
  • Country: es
  • Dutch, early retired, living in Spain
Hi all,

I got my hands on a 2232, that had a compressed horizontal display.
Vertical was OK.
I first checked all the Power Supply voltages, and they were all OK, so I went to the horizontal amplifier.

There the 100V was OK too, but since the picture was compressed, but centered, I figured it had to be something both the amps were suffering from.
I had a better look at the voltage divider that provided bias for both amps, R792 and R793.
R792 was spot-on 5k36, but R793 measured (in circuit) way to high.

I removed R793 (difficult because of the High Voltage cable running on top of it-) and it was gone... completely open!!
I replaced it with a bigger metalfilm 1/4W resistor I selected to be 56k2 et voila: Succes!!

I think this resistor was dimensioned way too small to be used in a 100V circuit, but who am I to judge....

Un saludo,

Satbeginner (Leo)
« Last Edit: April 05, 2017, 08:47:50 am by Satbeginner »
You need a scope to repair a scope, and you need many multimeters to repair another multimeter!
*Tek 2467B, Tek 2465B, Tek 2465B, Tek 485, Tek 475A,  Keithley 175A, Keithley 2000, HP 3468B, HP 3457A, HP 34401A, PM 6671, PM 5716, Fluke 45, Fluke 75, Fluke 77, Fluke 79, AFX 9660BL, KPS 605D, etc. *
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf