HHB FlashMic DRM85 Manuale utente
Service Manual
Version 0.91 February 2007
DRM85 FlashMic Service Manual Version 0.91 Page 2 of 22
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. LCD removal ...........................................................................................11
8. LCD lens removal.....................................................................................12
Assembly.......................................................................................................13
1. Capsule replacement ...........................................................................13
2. Key pad replacement................................................................................13
3. End Cap replacement................................................................................14
4. AF PCB replacement ................................................................................14
5. Connector PCB replacement......................................................................14
6. CPU PCB replacement..............................................................................15
7. LCD replacement.....................................................................................15
8. LCD lens replacement...............................................................................15
Firmware including updates ..............................................................................16
1. Firmware problems ..................................................................................16
Known Faults..................................................................................................17
1. Failure of Keyboard buttons .......................................................................17
The FlashMic Family ........................................................................................17
1 DRM85 – Omnidirectional...........................................................................17
2 DRM85C - Cardioid ..................................................................................17
3 Differences between the two models............................................................18
Exploded view .................................................................................................19
Parts list .......................................................................................................20
Parts list – part 2 ...........................................................................................21
Parts list – part 3 ...........................................................................................22
DRM85 FlashMic Service Manual Version 0.91 Page 3 of 22
Overview and layout
This service manual is written for the use of trained service personnel only, severe
damage could be caused by disassembly of the FlashMic by untrained operatives.
The manual is laid out with sections on disassembly, assembly, firmware updates,
known faults, and differences between different models.
The sections at the end show an exploded view of the unit and a full parts list.
Throughout the text the item numbers as shown in the exploded diagrams are
enclosed in square brackets, for example [001]
Please note that only a few component parts are available for the PCB’s as changing
other PCB components is not considered practical for field service, if faults occur the
whole PCB must be replaced.
Tools
Normal workshop tools for work on small electronic assemblies are required; the only
additional items that are essential are a number T06 and T08 Torx driver, do not
attempt to use other tools to remove the 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
FlashMic website www.flashmic.info
DRM85 FlashMic Service Manual Version 0.91 Page 4 of 22
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.
Next the barrel of the microphone [002] must be unscrewed from the end cap; this is
also removed by unscrewing anticlockwise, when viewed from the capsule end.
DRM85 FlashMic Service Manual Version 0.91 Page 5 of 22
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. Key pad removal
The key pad [021] Record, Play and Menu buttons should be removed by using a stiff
but not scratchy narrow tool inserted just above the Record button (shown by arrow), a
narrow nylon cable tie is ideal for this task. If a screwdriver is used it is very easy to
scratch the case of the unit or mark the rubber of the keypad.
DRM85 FlashMic Service Manual Version 0.91 Page 6 of 22
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.
3. End Cap removal
The keypad MUST be removed (see 2 above) before the end cap is removed otherwise
damage to the Keyboard and CPU PCB’s WILL occur.
After step 2 above unscrew the barrel [002] and slide away from the end cap. Using a
T08 Torx driver undo the three retaining screws [016]
Then the End cap can be gently removed from the chassis and barrel, take care to
ensure the PCB’s slide out of the end cap squarely.
DRM85 FlashMic Service Manual Version 0.91 Page 7 of 22
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.
The ribbon cable [015] has to be disconnected from the AF PCB, this is done by lifting
the black locking latch on the connector (shown arrowed above), and then the cable
[015] can be carefully pulled out from the connector. Once the cable is free the screw
DRM85 FlashMic Service Manual Version 0.91 Page 8 of 22
[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 9 of 22
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.
DRM85 FlashMic Service Manual Version 0.91 Page 10 of 22
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.
Once the screw [019] is removed the connections can be unsoldered (3 connections
as shown by the arrows below) and the CPU PCB removed, this must be done with
care to ensure no damage occurs to the PCB or the battery connecting wires.
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