HHB FlashMic DRM85 Service Manual
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HHB FlashMic DRM85 Service Manual

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Service Manual
Version 0.91
February 2007

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Summary of Contents for HHB FlashMic DRM85

  • Page 1 Service Manual Version 0.91 February 2007...

  • Page 2: Table Of Contents

    Table of contents Table of contents ....................2 Overview and layout ...................3 Disassembly .....................4 1. Capsule removal ..................4 2. Key pad removal ..................5 3. End Cap removal ..................6 4. AF PCB removal..................7 5. Connector PCB removal ................9 6. CPU PCB removal ..................10 7.

  • Page 3: Overview And Layout

    Torx headed screws as damage will result. Notes Before disassembly takes place, the batteries must be removed. No part of this manual may be reproduced or copied © HHB Communications Ltd www.flashmic.info FlashMic website DRM85 FlashMic Service Manual Version 0.91...

  • Page 4: Disassembly

    Disassembly 1. Capsule removal To remove the capsule the protective basket [004] must be unscrewed from the top of the barrel. This unscrews anticlockwise, when viewed from the top of the microphone. Ensure that the coloured ring [003] is not misplaced when the basket is removed. Be careful not to damage or touch the front elements of the capsule.

  • Page 5: Key Pad Removal

    Pull the barrel forward away from the end cap, this will expose the battery compartment lid [005] and allow access to the screw [013], which holds the capsule in place. Remove screw [013] then push the barrel back toward the end cap and the capsule can be gently pulled from the chassis [006] 2.

  • Page 6: End Cap Removal

    The rubber keypad is lifted away and then the Keyboard PCB [010] can be carefully removed – Please note that on the lower left hand rear edge (shown by arrow in diagram below) is the connector that connects to the main CPU PCB and the keyboard must be removed with the connector square so as to avoid any damage occurring.

  • Page 7: Af Pcb Removal

    4. AF PCB removal The AF PCB [007] is located inside the chassis [006] and is largely hidden from view as it is behind the battery compartment; with the end cap removed the end of the AF PCB (shown by arrow below) can be seen The capsule, keypad and end cap must all be removed before the AF PCB can be removed.
  • Page 8 [012] T06 Torx is unscrewed. Once the screw is removed the AF PCB can be slid down and out of the front end of the barrel. DRM85 FlashMic Service Manual Version 0.91 Page 8 of 22...

  • Page 9: Connector Pcb Removal

    5. Connector PCB removal After completion of steps 1-4 above the connector PCB [009] can be removed. Undo screw [020] with a T06 Torx driver being careful to retain washer [018]. This will leave the connector board only linked via the ribbon cable [014]. Turn the connector board over to gain access to the ribbon cable latch.

  • Page 10: Cpu Pcb Removal

    This latch at either end – shown by arrow above (CPU or Connector PCB) can be released and the ribbon cable removed, this will then free the Connector PCB. 6. CPU PCB removal To remove the CPU PCB [008] one Torx screw [019] must be removed and the three connections from the battery compartment have to be very carefully unsoldered.

  • Page 11: Lcd Removal

    7. LCD removal To remove the LCD from the Connector PCB, first follow steps 1-5 above and then on the Connector PCB [009] release the black latch holding the ribbon cable from the Connector PCB to the LCD module. DRM85 FlashMic Service Manual Version 0.91 Page 11 of 22...

  • Page 12: Lcd Lens Removal

    Then unclip the LCD from the PCB by moving the 4 LCD clips (shown arrowed below) to release the module. 8. LCD lens removal The LCD lens [022] can be removed from the exterior of the FlashMic with no other disassembly but it is very difficult to do.

  • Page 13: Assembly

    Then it is a simple matter to remove the lens by releasing the clip of the lens that is located near the closed end of the cap by using either your finger inserted into the end cap or a non-scratchy tool inserted through the keypad opening. Assembly In general assembly is the reverse of disassembly but there are a number of steps in the assembly that require particular care and these are detailed below:...

  • Page 14: End Cap Replacement

    3. End Cap replacement Inside the end cap are guides to hold the PCB’s securely in place, and during reassembly it is essential to make sure the boards are properly located. When the rear cap is nearly pushed fully home the USB connector, jack socket, and rotary switch will emerge from the end of the rear cap –...

  • Page 15: Cpu Pcb Replacement

    6. CPU PCB replacement Check that the CPU PCB holes for the soldered connections are clean before reassembly. Insert the CPU PCB in place checking the battery connections are in place in the PCB holes then screw the board in place using the T06 Torx screw before soldering the connections.

  • Page 16: Firmware Including Updates

    Firmware including updates The FlashMic firmware is held in non-volatile memory and two copies are kept in memory to ensure that operation is still possible even if the currently in use firmware somehow becomes corrupt. 1. Firmware problems Generally, most booting, freezing or locking up problems have been due to the earliest release of firmware, v3.02.10, which could corrupt the flash memory file system if the batteries were allowed to run flat in the mic.

  • Page 17: Known Faults

    Known Faults To date there have been very few re occurring faults, most problems relate to the use of very early firmware, please see above There is one known hardware problem that has occurred on a few occasions and that is detailed below: 1.

  • Page 18: Differences Between The Two Models

    The pick up of audio is higher from the front of the microphone than from the sides or rear. 3 Differences between the two models The Capsules are two different types as shown below, note that it is easy to distinguish the cardioid as it has two extensions on either side of the front plate of the capsule.

  • Page 19: Exploded View

    Exploded view DRM85 FlashMic Service Manual Version 0.91 Page 19 of 22...

  • Page 20: Parts List

    Parts list Item No. Part No. Description 512514 Microphone module Omnidirectional 514478 Barrel & end cap (supplied as matched pair) 511565 Coloured ring, purple 77535 Basket with pop protection 93126 Battery compartment SKM-G2 90343 Chassis 517630 Printed circuit board AF 517631 Printed circuit board CPU 517632...

  • Page 21: Parts List - Part 2

    Parts list – part 2 87425 Cable mini-USB 1.5m 517609 CD ROM with cover 76670 Microphone clamp black MZQ1 512723 512721 Box base 32x15x0.5 512720 Box cover 32x15x0.5 512725 Cardboard box 512722 Operations Manual Sub parts list to Part no 093126 90366 Flap for battery comp.

  • Page 22: Parts List - Part 3

    Parts list – part 3 Different items fitted to the DRM85C Cardioid version Microphone module Cardioid Barrel & end cap (supplied as matched pair) DRM85 FlashMic Service Manual Version 0.91 Page 22 of 22...

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