HHB-DRM85-mic-sm 维修电路原理图.pdf

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1、 Service Manual Version 0.91 February 2007 RadioFans.CN 收音机爱 好者资料库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 r

2、emoval.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 F

3、irmware 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 Ra

4、dioFans.CN 收音机爱 好者资料库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

5、 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 P

6、lease note that only a few component parts are available for the PCBs 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

7、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 Flas

8、hMic 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

9、 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 Fla

10、shMic 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 gen

11、tly 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 ver

12、y 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)

13、 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 PCBs WILL occur. Afte

14、r 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 PCBs slide out of the end cap squarely. DRM85 FlashMic Service Manual Version

15、 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

16、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 Servi

17、ce 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

18、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

19、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 carefu

20、lly 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. DRM85 FlashMic Service Manual Version 0.91 Page 11

21、of 22 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 12 of 22 Then unclip the LCD from t

22、he 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. It is much easier to remove the lens once the end cap is removed from the unit

23、. DRM85 FlashMic Service Manual Version 0.91 Page 13 of 22 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.

24、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: 1. Capsule replacement The capsule replacement is straightforward but make sure that the connector pins (opposite the screw socket) on

25、 the capsule are in correct alignment with the socket in the unit the alignment is correct when the pins on the capsule align with the LCD display window. When replacing the basket make sure the coloured ring 003 is replaced between the basket and the barrel. 2. Key pad replacement When replacing th

26、e keypad it is very important to make sure that the plug on the Keypad PCB 010 is correctly located in the socket that is mounted on the Connector PCB 009 this connector is located at the bottom left hand corner of the PCB in the picture below (indicated by arrow). The PCB is located precisely by th

27、e guides in the end cap moulding but it is essential to push the Keyboard PCB onto the socket squarely, otherwise damage to the plug or socket could result. DRM85 FlashMic Service Manual Version 0.91 Page 14 of 22 3. End Cap replacement Inside the end cap are guides to hold the PCBs securely in plac

28、e, 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 check these are correctly aligned, and do not force the end cap into place.

29、When replacing the three T08 Torx screws 016 do NOT over tighten as this could strip the threads in the chassis 006 4. AF PCB replacement The AF PCB must be slid down chassis 006 from the capsule end. When the PCB reaches the ribbon cable carefully fold the cable so that it goes under the AF PCB and

30、 the free end protrudes for connection after the T06 Torx screw 012 is inserted. Reconnect the ribbon cable making sure the latch on the ribbon cable socket is fully open, then insert the cable fully and close the latch. 5. Connector PCB replacement Lay the Connector PCB beside the CPU PCB so that t

31、he ribbon cable can be inserted, make sure the latch on the ribbon cable socket is fully open, then insert the cable fully and close the latch. The Connector PCB can then be folded over on top of the CPU PCB check the ribbon cable folds neatly between the two boards. Then screw the Connector PCB int

32、o place using the T06 Torx screw 020 and washer 018 DRM85 FlashMic Service Manual Version 0.91 Page 15 of 22 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

33、PCB holes then screw the board in place using the T06 Torx screw before soldering the connections. 7. LCD replacement Note that there are two alignment pins to allow easy positioning of the LCD module, when re attaching the ribbon cable first make sure the latch is open then ensure that the cable is

34、 fully inserted, before closing the socket latch 8. LCD lens replacement The LCD easily clips back into place but ensure the inside surface is cleaned before assembly of the end cap onto the unit. DRM85 FlashMic Service Manual Version 0.91 Page 16 of 22 Firmware including updates The FlashMic firmwa

35、re 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 firmwar

36、e, v3.02.10, which could corrupt the flash memory file system if the batteries were allowed to run flat in the mic. This bug was removed in an update to v3.02.12 that was the subject of a technical bulletin back in August 2006; all microphones should have been updated at that time. The current firmw

37、are is v4.04.06, which contains a still more secure file system. The firmware for the FlashMic may be updated from time to time and the latest version will be available for download from the website: www.flashmic.info 2. File corruption FlashMics with corrupt files systems (and, indeed, any FlashMic

38、) should be reformatted and then updated to v4.04.06. All data will be lost. There are two operator recovery options (first fit fresh or fully charged batteries): Try A first A. Hold down the REC and M buttons whilst powering on. The display will show DRM85 and go no further. Move the rocker switch

39、up or down. If the display shows SAME, them remove the batteries and start again, but move the rocker switch in the opposite direction to before (i.e., turn switch up if the switch was turned down before). The display should show UPDATE, with a progress bar. If successful, note, the firmware version

40、, and then perform a forced format, as described in B B. Forced reformat. Hold down REC, PLAY and M buttons whilst powering on. The display should show DRM85, then the firmware version, then FMT N Use the rocker control to select FMT Y and press in to select (all data will obviously be lost). Assumi

41、ng you manage to re-update in A and successfully reformat, then update the firmware to v4.04.06. Do the update twice (as stated above the Mic holds two copies of the firmware; you are choosing between the two copies in A above, so its important that both copies are updated). DRM85 FlashMic Service M

42、anual Version 0.91 Page 17 of 22 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. Failure of Keyboard but

43、tons This fault is exhibited by a total lack of any operation being possible from the Record, Play or Menu keys. This is caused by the socket that is mounted on the Connector PCB 009 becoming disconnected from the Connector PCB and requires disassembly of the unit as detailed in disassembly steps 1-

44、5 above. It will be found that when the Keyboard PCB 010 that the CPU PCB connector is attached to the plug PHOTO The connector can then be re soldered onto the PCB note that there are small alignment pips on the socket to locate the socket square in the PCB, it is most important to ensure the socke

45、t is square to the PCB once soldering is complete. PHOTO The FlashMic Family There are currently two different models in the FlashMic range and Omni and Cardioid: 1 DRM85 Omnidirectional The pick up of audio is broadly the same all around the microphone 2 DRM85C - Cardioid DRM85 FlashMic Service Man

46、ual Version 0.91 Page 18 of 22 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 si

47、de of the front plate of the capsule. Cardioid Omnidirectional Capsule Omnidirectional part number 512514 Capsule Cardioid part number And to ensure that the units can be differentiated from the exterior the barrel and cap are marked differently Barrel Omnidirectional part number 514478 Barrel Cardi

48、oid part number Please note that the barrel and end cap are supplied as a matched pair to ensure the logo on the barrel is correctly aligned with the with the keypad. All the electronics and the rest of the unit are identical DRM85 FlashMic Service Manual Version 0.91 Page 19 of 22 Exploded view DRM

49、85 FlashMic Service Manual Version 0.91 Page 20 of 22 Parts list Item No. Part No. Description 001 512514 Microphone module Omnidirectional 002 514478 Barrel & end cap (supplied as matched pair) 003 511565 Coloured ring, purple 004 77535 Basket with pop protection 005 93126 Battery compartment SKM-G

50、2 006 90343 Chassis 007 517630 Printed circuit board AF 008 517631 Printed circuit board CPU 009 517632 Printed circuit board Connector 010 517633 Printed circuit board Keyboard 011 511568 LCD 012 22980 Screw 2.5x4 DIN7985 013 Screw ? 014 87150 Flat cable 30 xRM0.5 015 87149 Flat cable 15xRM0.5 016