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🔴 Datron 4700 Calibrator Repair Part 5 – No.860


Datron 4700 Calibrator Repair Part 5

The reference board fails again so I have to dig into the high side flip flops and reference circuit to track down the fault and fix it once and for all.

The Datron 4700 is very similar to the Datron 4705, Datron 4708, as well as the Datron 4200A and Datron 4000.

This is Part 5, there are more videos about the repairs so check out the playlist and subscribe to make sure you don’t miss them when they are released.

Troubleshooting TP5 flip flop and TP3 flip flops

Part 1: https://youtu.be/Fvf3GMZI46s
Part 2: https://youtu.be/s2plnAavyKY
Part 3: https://youtu.be/XK1Sid5pXqY
Part 4: https://youtu.be/R7b1J9dplSw
Part 5: https://youtu.be/JGXFyaR6Lw8

0:00 – Intro.
0:34 – Demonstrating the 4700 reference assembly fault.
1:03 – Explaining the waveforms from the 4700 reference assembly.
4:57 – Looking the the 4700 reference assembly circuit diagram and my theories about the fault.
10:48 – Repairing a cracked trace.
12:14 – More testing to narrow down the fault on the 4700 reference voltage.
14:58 – Injection of my own 20.6V reference voltage to troubleshoot the flip flops.
16:06 – Finally noticing the clue I had missed earlier.
17:19 – Looking at the circuit diagram and narrowing down the reference assembly fault to the -11V supply.
20:15 – Retesting after replacing a component.
21:24 – Summary of what I had found from testing the 4700 reference assembly.
24:19 – Why the output voltage increased when the reference was being shorted out.
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