Soon the unit arrived with no damages during transport. I was aware of the seller's note 'Unit has a faint odor when power applied'.
It also reported Fail 9 which indicated failure in power supply. Thus I didn't wanted to power it without finding the cause.
I opened the instrument and found one discoloured tantalum capacitor and burned resistor. I replaced them with good ones.
I also found two quality controll issues.
Bent pin 1 of MC14049 was easy to fix.
One leg of 10R resistor was lifted. I have no doubt that it was overlooked during PCB inspection. I was worried how repairing this point will affect AC calibration but finally I did it.
There were also two burned fuses.
When I was sure that nothing is shorting power lines (checked with ohmmeter) I was very curious if it will run.
Next, I set correctly mains voltage selector to match EU standards.
Then I removed boards related to AC function and set DIP switch to detect only DC U, I, R.
I was ready to go.
After pressing power switch Fail 9 and Fail 1 appeared on the display.
Fail 9 meant another shorted tantalum cap and Fail 1 is related to overheating of power amplifier. But the heatsinks were cold.
I tracked mentioned shorted cap and replaced it. Then I checked resistance of NTC thermistors mounted on heat sinks. It was correct.
I replaced 4 tant caps connected to the thermistors and I tried powering one more time.
This time I was happy: the instrument started without any error and worked for five minutes.
Then magic smoke and fire escaped.
It was another 10uF/25V tant cap. At this point I decided to replace every tant and electrolytic cap in the instrument.
It was easy with desoldering station.
Then noisy fan was replaced with SUNON SP100A1123XST. Original Redpoint fan is shown as a reference.
I was ready to troubleshoot new issues.