Meridian 861V4 User manual

Service Guide 861V4 Surround Controller
SG006, Issue 1, 11th June 2012
This document is intended to be used in conjunction with the product’s User Guide.
This document shows how to repair the product using the technique of substitution of sub-assemblies, such as
complete circuit boards. Spare parts for this purpose are available from Meridian. Repairs to circuit-component
level are not covered in this document, but circuit diagrams are available from Meridian (subject to the terms of a
non-disclosure agreement - NDA).

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Contents:
Page
1. Main sub-assemblies within product 3
2. Signal routing through product 4
3. Basic functionality explained 5
4. Identification of main sub-assemblies 6
5. Location of main sub-assemblies 15
6. Disassembling the product 16
(6.1) Removing the Outer Cover Assembly 16
(6.2) Removing the Fascia assembly 16
(6.3) Removing the Display board 17
(6.4) Removing the Switch board 17
(6.5) Removing the Inner Lid 17
(6.6) Removing boards from the back-panel 18
7. Removing and replacing the PSU and Cap board 19
(7.1) An overview of the PSU and Cap board 19
(7.2) Removing and replacing a floor-mounted Cap board 20
(7.3) Removing and replacing a side-mounted Cap board 22
(7.4) Removing and replacing the older type of PSU 23
(7.5) Removing and replacing the newer type of PSU 27
8. Adjusting the output voltage of the PSU 28
9. Terminator cards – How many to fit and where to fit them 28
10. Reassembling the unit 30
(10.1) Fitting the Motherboard 30

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1. Main sub-assemblies
Short-form name Meridian System Name Part no.
PSU 800 SERIES PSU PA10140
Display board 800 SERIES DISPLAY BOARD PA10579
Switch board 800 SERIES SWITCH BOARD PA10580
Cap board 800 SERIES CAP BOARD PA10532
Motherboard 861/818/808.3 MOTHERBOARD PA10583
Com board 861 COM BOARD PA10563
IE42 board ASSY IE42 PCB SU2612
IA00 board ASSY IA00 PCB SU1672
OE12 board ASSY OE12 PCB (OE22H) SU0039
CD20 board ASSY CD20 PCB SU2602
EF20 board ASSY EF20 PCB SU3197
OA03 board ASSY OA03 PCB SU2756
OA13 board ASSY OA13 PCB SU2763
IA10 board ASSY IA10 PCB SU1652
IA20 board ASSY IA20 PCB SU1680
IA30 board ASSY IA30 PCB SU1688
IA35 board ASSY IA35 PCB SU1684
IA40 board ASSY IA40 PCB SU2136
IA45 board ASSY IA45 PCB SU2622
TP00 board ASSY TP00 PCB SU1660
ID20 board ASSY ID20 PCB SU1664
ID25 board ASSY ID25 PCB SU2925
ID30 board ASSY ID30 PCB SU1668
VS00 board ASSY VS00 PCB SU1676
VS10 board ASSY VS10 PCB SU2143
VS20 board ASSY VS20 PCB SU1692
VS40 board ASSY VS40 PCB SU2150
VS50 board ASSY VS50 PCB SU2930
Slave patch ASSY SL00 PCB SU1656
RF00 board ASSY RF00 PCB SU1975
Terminator card ASSY TM00 PCB SU2713

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2. Basic signal routing through product
CD20 -
DSP card EF20 - DSP card
IE42 - digital input
card
IA00 - analogue
input card
OE12 - digital
output card
OA03/OA13 -
analogue output
card
OA03/OA13 -
analogue output
card
Digital audio - coax
Digital audio - optical
Analogue audio - unbalanced
IA10
IA20
IA30
IA35
IA40 - analogue
input card
IA45 - analogue
input card
ID20 - digital input
card
ID25 - digital input
card
I|D30 - digital input
card
Analogue audio - multichannel
Analogue audio - multichannel
Analogue audio - Balanced XLR
Analogue audio - unbalanced
Audio from MC cartridge
Audio from MM cartridge
TP00
Analogue audio - unbalanced
These cards in any
combination,
in any sequence
(with a maximum of
one TP00)
SL00
VS00
VS10
VS20
VS40
VS50
Video on
these cards
does not
pass to other
cards
CO00 - computer
card
PSU module
Power PCB
Video inputs
(composite and S) Video outputs (composite and S-video)
Video inputs
(S video) Video outputs
(composite and S-video)
Video input
(component) Video output
(component + OSD)
Video inputs
(composite) Video outputs
(composite)
Video inputs
(component) Video output (component)
Comms patch - no
connections into 861
Digital audio - optical
Digital audio - coax
Digital audio - optical
Digital audio - AES/EBU
Digital audio - AT&T optical
Analogue outputs
Analogue outputs
Digital outputs
Analogue output
unbalanced
Analogue output
headphone jack

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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.

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4. Identification of main sub-assemblies
PA10140: 800 SERIES PSU
PA10579: 800 SERIES DISPLAY BOARD
PA10580: 800 SERIES SWITCH BOARD

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PA10532: 800 SERIES CAP BOARD
PA10583: 861/818/808.3 MOTHERBOARD
PA10563: 861 COM BOARD

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SU2612: IE42 PCB
SU1672: IA00 PCB
SU0039: OE12 PCB (OE22H)

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SU2602: CD20 PCB
SU3197: EF20 PCB
SU2756: OA03 PCB

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SU2763: OA13 PCB
SU1652: IA10 PCB
SU1680: IA20 PCB

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SU1688: IA30 PCB
SU1684: IA35 PCB
SU2136: IA40 PCB

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SU2622: IA45 PCB
SU1660: TP00 PCB
SU1668: ID30 PCB

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SU1676: VS00 PCB
SU2143: VS10 PCB
SU1692:VS20 PCB

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SU2150: VS40 PCB
SU2930: VS50 PCB
SU1656: SLOO PCB

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SU1975: RF00 PCB
TM00 TERMINATOR BOARD
5. Location of main sub-assemblies
The Display board and Switch board are located within the Fascia of the product. Remove the
Fascia to gain access to these boards
The PSU module, Cap board and Motherboard are located within the Main section of the chassis.
The outer-cover and inner-lid must be removed to gain access to these items.
All other cards plug into the Motherboard are accessed from the back-panel. In some cases,
there are ribbon looms which connect internally to the card. Access to these can be made from
the back-panel, but may be made easier by removing the outer-case and inner lid.

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6. Disassembling the product
(6.1) Removing the Outer Cover assembly
Remove the four screws on each side which
secure the Outer Cover to the chassis.
From the rear of the unit, slide the Outer Cover
backwards away from the chassis.
(6.2) Removing the Fascia assembly
Remove the Top Cover Assembly as described
above
Remove the four screws (two on each side)
securing the front-panel assembly to the
chassis.
Carefully tip the Fascia forward and disconnect
this loom from the Display board. The Fascia
can now be removed from the chassis.

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(6.3) Removing the Display board
Noting its orientation, disconnect the small loom from
between the Display board and Switch board.
Remove the four Torx T10 screws and nylon washers
from the Display board. The Display board can now be
removed.
(6.4) Removing the Switch board
Noting its orientation, disconnect the loom between
Display PCB and Switch PCB.
Remove 6 off Screws and Nylon Washers from Switch
PCB. Remove Switch PCB.
(6.5) Removing the Inner Lid
On each side of the chassis remove the four
black self-tapping screws which secure the
inner top cover to the chassis.
There will be one or two screws on the top of
the inner top cover. Remove the screw(s)and
the associated nylon washer(s). Remove the
inner cover

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(6.6) Removing boards from the back-panel
If fitted, remove any Torx-headed screws located
between the board to be removed and the adjacent
boards.
Remove the Torx T8 screws securing the board
along the top and bottom of its mini back-panel.
The board can then be pulled backwards out of the
chassis.
The Com board is connected internally by a loom.
This must be disconnected - see below
The Com board has a 12-way ribbon loom
plugged into a header close to its upper edge.
Here, the mini back-panel has been removed –
this is not essential in order to remove the board.
Noting its orientation, disconnect the loom. The
Com board can now be pulled out of the unit.
(6.7) Removing the Motherboard
Disconnect the two looms which connect the
Cap board to the back of the Motherboard
Using a suitably-long screwdriver, remove the
six screws retaining the top edge of the
Motherboard to the upper chassis rail.
Remove the Motherboard from the rear of the
chassis.

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7. Removing and replacing the PSU and Cap board
(7.1) An overview of the PSU and Cap board
There have been two differing power supplies and used on 861.There has also been two differing mounting
methods for the Cap board. If the PSU is to be changed from the older type to the new, a modification is
required on the Switch PCB within the fascia of the unit.
Whenever a new PSU is fitted, its output voltage must be checked (and adjusted if necessary) as described in
Section 8 of this document.
This picture shows a unit with the oldest
combination of PSU and Cap board. The PSU is
of the old type indicated by the fact that it carries
the “Meridian” logo. The Cap board is mounted on
the floor of the chassis alongside the PSU. If the
Cap board is replaced, the new board must be
fitted to the side of the chassis in order for its
output looms to reach the Motherboard. This may
necessitate drilling four new holes in the side of
the chassis in order to mount the board.
Instructions for doing this are given below.
This unit contains the old type of PSU, but the
Cap board is mounted on the side of the chassis.
The new Cap board can be fitted as a direct swap
for the old one.
This picture shows the new-type PSU and the
Cap board is mounted on the side of the chassis.
The new Cap board and the PSU can be fitted as
a direct swap for the old one.

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(7.2) Removing and replacing a floor-mounted Cap board
Disconnect the output cable loom from the PSU
(old-style PSU shown).
Disconnect the two looms connecting the Cap board
to the Motherboard.
If fitted, this loading resistor needs to be detached
from the chassis. It is bonded to the case with
adhesive and can be prised off without too much
effort. The replacement Cap board does not feature
such a resistor, so it can be discarded.