ML 390S, 39 or 37 transport schematics

Hi, I have a problem with a ML390S. When switched on, the laser head rattels loudly because the laser bangs against the focus coils. The cdm2 control pcb is ok, the voltages are clean and stable. However, no reference clock is generated for about 20 sec after switch on. After that, a clock is generated which slowly increases in frequency. Can anybody help with the schematis of the control board of the 390, 39 or 37, where the clock generator is? Any help is greatly appreciated.