I have a chinese crystal engrave machine.

Type HSGP-4KB
laser / laser wavelength
semiconductor diode/ 532nm
laser repetition frequency 4000hz

now it stop engraving and im trying to check the problem.
I realy need help in understand the values of the panel. it say values for:

LDT:21.0°C
LHT:28.0°C
C1T:26.0°C
C2T:60.0°C
PRF:20.0KHz
PWM:102%

I need to understand these values to facilite the comunication with the enginners.
Thx in advance for anyone who could help me