Thandar TG2001 Function Generator Repairs

[Orion63]

Hi, I bought this Thandar TG 2001 function generator from a local garage sale. However, when plugged it up, I could see the display responding well for the changes in the Frequency, Amplitude and the Offset knobs. But I do not get an output from the Main Output BNC or the TTL BNC. I have checked the DC voltages +21V, -21V, +16V, -16V, +12V, -12V,+5.2V and the -5.2V on the board, and they are spot-on correct. I don't see any visual damage, like burnt resistors or transistors on the PCB.
Any suggestions on what to look for ? Can anyone share a schematic/service manual if possible ? Regards

[45Overload]

Orion,
Function Generators often have d.c. coupled output stages which will blow up if the test leads are accidentally shorted or if they are accidentally connected to a voltage source.  I would check the output stage parts with the schematic that I know you have!
-45O