The MZ work completed. I replaced the bad cross connection terminal. The gain slider is working now.

I looked at the error spectrum on an FFT analyzer. I could see the lock was more tight.

Then I proceeded to the MZ epics panel.

1) C1:PSL-MZ_MZTRANSPD has no meaning (not connected). So I put  C1:PSL-ISS_INMONPD as the MZ trans monitor.

2) The EPICS setting for the MZ gain slider was totaly wrong.
    Today I learned from the circuit, the full scale of the gain slider C1:PSL-MZ_GAIN gave us +/-10V at the DAC.
    This yield +/-1V to V_ctrl of the AD602 after the internal 1/10 attenuation stage.
    This +/-1V didn't correspond to -10dB~+30dB, but does -22dB~+42dB and is beyond the spec of the chip.

    The gain of AD602 is calculated by

G [dB] = 32 V_crtl + 10,  for -0.625 [V]< V_ctrl < +0.625 [V].

    In order to fix this I used the following commands which overrode the EPICS parameters.
    The tip of EGUF/EGUL is to know how much the gain (virtually) goes for the full scale of the DAC output. 

ezcawrite C1:PSL-MZ_GAIN.EGUF 42
ezcawrite C1:PSL-MZ_GAIN.EGUL -22
ezcawrite C1:PSL-MZ_GAIN.DRVH 30
ezcawrite C1:PSL-MZ_GAIN.DRVL -10
ezcawrite C1:PSL-MZ_GAIN.HOPR 30
ezcawrite C1:PSL-MZ_GAIN.LOPR -10

   and for the permanent change I modified the db file /cvs/cds/caltech/target/c1iool0/c1iooMZservo.db
   This will be active when cliool0 is rebooted.

# This yields the output limited to -6.25V ~ +6.25V, which corresponds to -10dB ~ +30dB
# modified by Koji Arai (29-Sept-2009)
grecord(ao,"C1:PSL-MZ_GAIN")
{
        field(DESC,"GAIN- overall pre-modecleaner servo loop gain")
        field(SCAN,"Passive")
        field(PINI,"YES")
        field(DISV,"1")
        field(DTYP,"VMIVME-4116")
        field(OUT,"#C3 S5 @")
        field(EGUF,"42")
        field(EGUL,"-22")
        field(PREC,"1")
        field(EGU,"dB")
        field(HOPR,"30")
        field(LOPR,"-10")
        field(DRVH,"30")
        field(DRVL,"-10")
        field(LINR,"LINEAR")
        field(OROC,"0")
        field(DOL,"0")
}

# previous code
grecord(ao,"C1:PSL-MZ_GAIN")
{
        field(DESC,"GAIN- overall pre-modecleaner servo loop gain")
        field(SCAN,"Passive")
        field(PINI,"YES")
        field(DISV,"1")
        field(DTYP,"VMIVME-4116")
        field(OUT,"#C3 S5 @")
        field(EGUF,"30")
        field(EGUL,"-10")
        field(PREC,"4")
        field(EGU,"Volts")
        field(HOPR,"30")
        field(LOPR,"-10")
        field(LINR,"LINEAR")
        field(OROC,"0")
        field(DOL,"0")
}