Meridian 861V4 Service Manual page 29

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Page 29/30
If the 861 is not fitted with an IA45 board:
In the following description, "left" and "right" refer to the position when looking at the back-panel of the unit. Note
that the two types of each analogue output board are equivalent; OA02M and OA12M are equivalent to each
other as are OA03 and OA13.
Here is a list of the various combinations and the associated requirement for fitting terminators for a unit which is
not fitted with IA45 :
No IA45 OE12
No IA45 OE12
No IA45 OE12
No IA45 OE12
No IA45 OE12
No IA45 No OE12
No IA45 No OE12
No IA45 No OE12
No IA45 No OE12
If the 861 is fitted with an IA45 board:
The IA45 multi-channel analogue input board can cause unpredictable problems with data flow across the back-
plane (Motherboard) of the 861. Therefore, if a unit is fitted with an IA45, it may be necessary to experiment with
terminator positions in order to avoid unwanted audio problems. However, there are cases where none of the
combination of terminator fittings will prevent these problems. If this is case and if the system requirements allow
it, changing the output card combination may result in a successful outcome. Such an example is to fit an OE12
even though it is not needed. Nevertheless, it may be the case that a particular unit simply will not support the
IA45 and the combination of boards required. One work-around is to remove the IA45 and to substitute the IA40
multi-channel analogue input board in its place.
For all combinations of output boards, start by fitting both left and right terminator cards. Check the unit will
produce audio successfully when a digital input is fed with each of the following signals:

Dolby Digital 5.1

DTS 5.1

PCM or MHR at 44kHz

PCM or MHR at 48kHz

PCM or MHR at 96kHz.
If problems occur, try removing the one of the terminators – start with the left-hand one. On problem units fitted
with two analogue output cards, it may also prove fruitful to position the IA00 board on the extreme left of the
back-panel and to plug the left terminator card into the slot just to the right of the IA00 board.
No analogue outputs
1 x OA02M or OA12M
2 x OA02M or OA12M
1 x OA03 or OA13
2 x OA03 or OA13
1 x OA02M or OA12M
2 x OA02M or OA12M
1 x OA03 or OA13
2 x OA03 or OA13
Left terminator Right terminator
Yes
Yes
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes