Bench Power Supply Failed
Based on your comments to hex4def6's answer, I understand the following:


The voltage adjustment works fine (verified with an external voltmeter)
The voltage indicators are fine (verified with an external voltmeter)
The supply can drive output current (verified with an external ampermeter + the load resistor gets hot)
The current indicator is broken (it shows zero current even when an external ampermeter measures non-zero current)
The current capability reduced 


Are these statements correct?

If they are:

It seems like the supply itself is generally Ok, but its current indicator is broken + some reduction in current capability.

In order to indicate the possible root-causes of the issue we need to see a complete schematics. I didn't find your VLS-10M on the web, but I found VLS-35M: 



These two are probably the same architecture, just having different number of paralleled pass transistors for driving the current (this one has 8 and delivers 35A intermittent current , while yours should be 2-3 which accounts for 10A).

If it is really the case that internal ampermeter is broken, I see three places where this could happen, without ruining the whole PSU:

RED: The pot used for current scale adjustment or the analog scale itself can be broken

ORANGE: The negative feedback (stabilizing) power resistor which is also used as a shunt for internal ampermeter can be broken

YELLOW: The pass transistor which feeds the above shunt resistor can be broken

Both orange and yellow failures would result in reducing the current capability of your PSU. If the current capability of your PSU is the same as before, I'd say that the issue is either the pot or the analog scale. However, based on your description, it looks like there is some reduction in current capability. 

In order to verify this probe the voltage on the shunt resistor - if the voltage changes when you change the output current (by attaching smaller load for example) then both the resistor and the transistor are (probably) fine.

BTW, how comes PSU which is rated for 8A continuous current has 5A fuse?

Hope this helps.