Basic Functionality Explained - Meridian 861V4 Service Manual

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3. Basic functionality explained

All 861V4 units have three cards which must be fitted in order for the unit to function correctly:
IE16 digital input
CD20 DSP card
EF20 DSP card
In addition, at least one audio output card from the following list must be fitted in order for the unit to product
sound:
OE12 digital output card
OA02M unbalanced analogue output card
OA12M balanced analogue output card
OA03 unbalanced analogue output card
OA13 balanced analogue output card
Most analogue output cards fitted to 861V4 are either OA03 (unbalanced) or OA13 (balanced. However, it is
possible to fit the earlier OA02 and OA12 cards if the card is modified appropriately (details are available from
Meridian). Such modified cards are designated OA02M and OA12M respectively. However, these designation is
not shown on the back panel of the card. Hence, if cards marked should be taken if cards are
For troubleshooting purposes, the analogue output cards can be considered the same and will be referred to as
"OA" cards
The following combinations are possible:
1 x OE12 - for systems with only DSP speakers
2 x OA card - for systems with only analogue amps and speakers
1 x OE12, 1 x OA card - for systems with a combinations of speaker types.
1 x OE12, 2 x OA card - for demo units which may be connected to various speaker systems.
In theory, 1 x OA card without OE12 can be used, but such a set up will support speaker systems up to only
"4.0" channels, so it is unlikely to be found in practice.
Up to two terminator cards may be fitted to the Motherboard. The position and number of these are explained in
Section 9 of this document.