In part 1 of this video series I attempt to tackle an intermittent and elusive fault on the 182T CRT display

0:00 – Intro/Overview
8:53 – Visual inspection/teardown
12:55 – 182T power rail testing
14:50 – scratchy intensity pot symptom
15:40 – 3kV test point check
16:25 – A2 control module PCB cleaning
17:16 – New fault symptom, loss of HV supply
18:44 – All low voltage rails found to be low!
20:12 – Isolation of power supply module from unit, LV rails back up
22:30 – Isolating the HV supply
24:00 – small rant about poor design
25:33 – LV rail testing with HV supply & CRT disconnected
27:13 – Reconnecting HV/CRT and CRT powers back on!
30:00 – injecting calibrator signal to ext input – CRT shuts off again…
31:26 – troubleshooting the low LV rails again
36:15 – isolating the power supply module 2nd time
37:24 – checking +100V rail on scope
38:16 – checking filter caps for ripple C1-C4
41:26 – testing series regulator transistors Q1 and Q4 on curve tracer
44:23 – testing VR2 9V reference Zener on curve tracer
47:32 – testing power supply module after Zener replaced with 8.2V
48:52 – adjusting +100V to spec
49:11 – checking all LV rails – all in spec!
49:57 – testing with unit reassembled
53:55 – Outro