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Service Guide 861V4 Surround Controller
th
SG006, Issue 1, 11
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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Table of Contents
Related Manuals for Meridian 861V4
Summary of Contents for Meridian 861V4
- Page 1 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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Page 2: Table Of Contents
Page 2/30 Contents: Page Main sub-assemblies within product Signal routing through product Basic functionality explained Identification of main sub-assemblies Location of main sub-assemblies Disassembling the product (6.1) Removing the Outer Cover Assembly (6.2) Removing the Fascia assembly (6.3) Removing the Display board (6.4) Removing the Switch board (6.5) Removing the Inner Lid (6.6) Removing boards from the back-panel... -
Page 3: Main Sub-Assemblies Within Product
Page 3/30 1. Main sub-assemblies Short-form name Meridian System Name Part no. 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... -
Page 4: Signal Routing Through Product
Page 4/30 2. Basic signal routing through product Analogue output unbalanced CO00 - computer TP00 Analogue audio - unbalanced card Analogue output headphone jack PSU module IA35 Audio from MM cartridge Power PCB IA30 Audio from MC cartridge Comms patch - no IA20 SL00 Analogue audio - unbalanced... -
Page 5: Basic Functionality Explained
Page 5/30 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... -
Page 6: Identification Of Main Sub-Assemblies
Page 6/30 4. Identification of main sub-assemblies PA10140: 800 SERIES PSU PA10579: 800 SERIES DISPLAY BOARD PA10580: 800 SERIES SWITCH BOARD... - Page 7 Page 7/30 PA10532: 800 SERIES CAP BOARD PA10583: 861/818/808.3 MOTHERBOARD PA10563: 861 COM BOARD...
- Page 8 Page 8/30 SU2612: IE42 PCB SU1672: IA00 PCB SU0039: OE12 PCB (OE22H)
- Page 9 Page 9/30 SU2602: CD20 PCB SU3197: EF20 PCB SU2756: OA03 PCB...
- Page 10 Page 10/30 SU2763: OA13 PCB SU1652: IA10 PCB SU1680: IA20 PCB...
- Page 11 Page 11/30 SU1688: IA30 PCB SU1684: IA35 PCB SU2136: IA40 PCB...
- Page 12 Page 12/30 SU2622: IA45 PCB SU1660: TP00 PCB SU1668: ID30 PCB...
- Page 13 Page 13/30 SU1676: VS00 PCB SU2143: VS10 PCB SU1692:VS20 PCB...
- Page 14 Page 14/30 SU2150: VS40 PCB SU2930: VS50 PCB SU1656: SLOO PCB...
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Page 15: Location Of Main Sub-Assemblies
Page 15/30 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. -
Page 16: Disassembling The Product
Page 16/30 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... -
Page 17: (6.3) Removing The Display Board
Page 17/30 (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. -
Page 18: (6.6) Removing Boards From The Back-Panel
Page 18/30 (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. -
Page 19: Removing And Replacing The Psu And Cap Board
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. -
Page 20: (7.2) Removing And Replacing A Floor-Mounted Cap Board
Page 20/30 (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. - Page 21 Page 21/30 Remove the Cap board by undoing the four screws securing it to the chassis through either the underside or the side of the chassis as relevant. Retain all fixing screws, washers and the hexagonal mounting-pillars used on the Cap board as these parts will be required to mount the new assembly Position of holes in side of chassis for fitting new-type Cap board to units previously fitted with “floor-mounted”...
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Page 22: (7.3) Removing And Replacing A Side-Mounted Cap Board
Page 22/30 (7.3) Removing and replacing a side-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. Remove the Cap board by undoing the four screws securing it through the side of the chassis. -
Page 23: (7.4) Removing And Replacing The Older Type Of Psu
Page 23/30 (7.4) Removing and replacing the older type of PSU Disconnect the input and output cable looms from the PSU. Undo the nut retaining the grounding cable to the chassis and remove the cable from the stud. This is located on the floor of the chassis in the void behind the mains inlet. - Page 24 Page 24/30 Modifying the Switch PCB (required when replacing the old-style PSU) When fitted with the new-type PSU, the 861 requires a modification to the Switch board. This involves removing a capacitor and fitting a three-pin “watchdog” IC. The Switch board is located within the front-fascia assembly. To gain access to it, the fascia must be removed as described in Section 6.
- Page 25 Page 25/30 Noting the orientation, disconnect the loom between the Display board and the Switch board. Remove the six screws and nylon washers from the Switch board. Remove the Switch board. Remove capacitor C3 Scrape away a section of the solder-resist layer of this track as shown here...
- Page 26 Page 26/30 The watchdog IC - Meridian part-number D81813 Solder the two outer pins of the IC into the footprint left by the removal of the capacitor. The centre pin (VCC) of the IC should be connected to the exposed track as shown.
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Page 27: (7.5) Removing And Replacing The Newer Type Of Psu
Page 27/30 (7.5) Removing and replacing the newer type of PSU Disconnect the Mains Input and Motherboard PCB looms from the PSU. Undo the nut retaining the grounding cable to the chassis and remove the cable from the stud. This is located on the floor of the chassis in the void behind the mains inlet. -
Page 28: Adjusting The Output Voltage Of The Psu
Page 28/30 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. - Page 29 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.
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Page 30: Reassembling The Unit
Page 30/30 10. Reassembling the unit In most instances, reassembly is a straightforward reversal of the disassembly process. Ensure all earth connections are fully tightened. (10.1) Fitting the Motherboard To ensure the Motherboard is aligned correctly, locate it inside the chassis without securing it. Slide one of the plug-in boards into the guide rails to align the Motherboard.