Adjusting The Output Voltage Of The Psu; Terminator Cards - How Many To Fit And Where To Fit Them - Meridian 861V4 Service Manual

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8. Adjusting the output voltage of the PSU

Note: This instruction applies to all units being serviced, regardless of the type of PSU removed from the unit.
This voltage must be checked and adjusted before any further use of the unit is attempted.
While measuring the voltage, the output of the PSU should be adjusted to provide 5.2V on the output of the PSU.
This is measured between the red and black output wires on the PSU. The adjustment is carried out using a
small screwdriver to turn the trimmer located adjacent to the 6-way header on the PSU as shown here:
Output adjustment trimmer
Once the voltage has been set correctly, the unit can be powered down and the inner and outer top-covers can
be re-fitted.
9. Terminator cards – how many to fit and where to fit them
The 861 may be fitted with "terminator" cards. These are small boards which plug into the Motherboard to affect
data flow across the back-plane. The number and position of the terminator cards is determined by the
combination of output cards fitted to the unit and whether an IA45 input card is fitted. If the correct combination
of terminator cards is not fitted to the unit, audio problems may occur. These include sporadic clicks and pops or
unexpected bursts of noise or tones on the audio outputs.
TM00 Terminator card
There are two positions where a terminator can be fitted. The Com board is always fitted on the extreme right of
the Motherboard (viewed from the rear of the unit). If terminators are fitted, they plug into the slot which is next to
the Com board and/or the outermost slot at the extreme left side of the Motherboard.