--- a/content/hp8662a.rst Wed Apr 11 23:17:04 2018 +0200
+++ b/content/hp8662a.rst Wed Apr 11 23:11:52 2018 +0200
@@ -42,6 +42,7 @@
before even attempting to fix the PSU.
.. image:: {filename}images/hp8662a/dirty_hp.jpg
+ :class: image-process-large-photo
And I must say that if most of the unit is very easy to service due to the
@@ -51,14 +52,18 @@
so very tedious.
.. image:: {filename}images/hp8662a/top_before_2.jpg
+ :class: image-process-large-photo
.. image:: {filename}images/hp8662a/bottom_before.jpg
+ :class: image-process-large-photo
.. image:: {filename}images/hp8662a/front_after.jpg
+ :class: image-process-large-photo
Also, there are hundreds of screws in this unit! it's insane.
.. image:: {filename}images/hp8662a/top_after.jpg
+ :class: image-process-large-photo
Whatever, I finally got to a point I could clean most of the parts of the unit,
so I started to reassemble it. Unfortunately, I did not took enough pictures
@@ -66,12 +71,14 @@
like an HP 8662A...
.. image:: {filename}images/hp8662a/reassembling_2.jpg
+ :class: image-process-large-photo
Once I had the structure of the generator back togother, with the back plane in
place but no other board nor module plugged in, I started to take care of the
PSU.
.. image:: {filename}images/hp8662a/reassembling_1.jpg
+ :class: image-process-large-photo
The PSU
=======
@@ -87,6 +94,7 @@
the mani switch on the front panel only activate the switching.
.. image:: {filename}images/hp8662a/PSU_simplified_schematic.jpeg
+ :class: image-process-large-photo
The 4 boards the PSU is made of are:
@@ -106,6 +114,7 @@
regulation being made on the 5.2V rail, which is not regulated by A7A1.
.. image:: {filename}images/hp8662a/PSU_block_diagram.jpeg
+ :class: image-process-large-photo
So I gave a close look at thes boards, beginning by the main board, the I found
the culprit for the smoke: the input protection thermistor. Strangely, it still
@@ -138,6 +147,7 @@
the inverter board were very low. Somethin was wrong.
.. image:: {filename}images/hp8662a/PSU_inverter_schematic.jpeg
+ :class: image-process-large-photo
Looking at the schematics and the boards, I did find several failure points:
@@ -160,6 +170,7 @@
skookum but does the job for a few cents.
.. image:: {filename}images/hp8662a/broken_choke.jpg
+ :class: image-process-large-photo
After these fixes, I reassembled the PSU and tried again: the result was quite
promising, but not a complete success: the PSU seemed to start, but very