Denon-DVM-745-Service-Manual(1) 电路图 维修手册.pdf

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1、Denon Brand Company, D when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) 4.Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6) CAUTION: 1.The Flat Pack-IC shape may differ by models.

2、 Use an appropriate hot-air flat pack-IC desoldering machine, whose shape matches that of the Flat Pack-IC. 2.Do not supply hot air to the chip parts around the flat pack-IC for over 6 seconds because damage to the chip parts may occur. Put masking tape around the flat pack-IC to protect other parts

3、 from damage. (Fig. S-1-2) Top View OutIn Bottom View Input 5 10 Pin 1 Pin 1 FFC Cable Connector CBA * Be careful to avoid a short circuit. Fig. S-1-1 6 DVM-1845/745 3.The flat pack-IC on the CBA is affixed with glue, so be careful not to break or damage the foil of each pin or the solder lands unde

4、r the IC when removing it. With Soldering Iron: 1.Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3) 2.Lift each lead of the flat pack-IC upward one by one, us

5、ing a sharp pin or wire to which solder will not adhere (iron wire). When heating the pins, use a fine tip soldering iron or a hot air desoldering machine. (Fig. S-1-4) 3.Bottom of the flat pack-IC is fixed with glue to the CBA; when removing entire flat pack-IC, first apply soldering iron to center

6、 of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) 4.Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6) Hot-air Flat Pack-IC Desoldering Machine CBA Flat Pack-IC Tweezers Masking Tape Fig. S-1-2 Flat Pack-IC Desoldering Braid Soldering Iron Fig. S-1-3 F

7、ine Tip Soldering Iron Sharp Pin Fig. S-1-4 7 DVM-1845/745 With Iron Wire: 1.Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, you can remove it easily. (Fig. S-1-3) 2.Affix the wire to a workbench

8、 or solid mounting point, as shown in Fig. S-1-5. 3.While heating the pins using a fine tip soldering iron or hot air blower, pull up the wire as the solder melts so as to lift the IC leads from the CBA contact pads as shown in Fig. S-1-5. 4.Bottom of the flat pack-IC is fixed with glue to the CBA;

9、when removing entire flat pack-IC, first apply soldering iron to center of the flat pack-IC and heat up. Then remove (glue will be melted). (Fig. S-1-6) 5.Release the flat pack-IC from the CBA using tweezers. (Fig. S-1-6) Note: When using a soldering iron, care must be taken to ensure that the flat

10、pack-IC is not being held by glue. When the flat pack-IC is removed from the CBA, handle it gently because it may be damaged if force is applied. 2. Installation 1.Using desoldering braid, remove the solder from the foil of each pin of the flat pack-IC on the CBA so you can install a replacement fla

11、t pack-IC more easily. 2.The “” mark on the flat pack-IC indicates pin 1. (See Fig. S-1-7.) Be sure this mark matches the 1 on the PCB when positioning for installation. Then presolder the four corners of the flat pack-IC. (See Fig. S-1-8.) 3.Solder all pins of the flat pack-IC. Be sure that none of

12、 the pins have solder bridges. To Solid Mounting Point Soldering Iron Iron Wire or Hot Air Blower Fig. S-1-5 Fine Tip Soldering Iron CBA Flat Pack-IC Tweezers Fig. S-1-6 Example : Pin 1 of the Flat Pack-IC is indicated by a mark. Fig. S-1-7 Presolder CBA Flat Pack-IC Fig. S-1-8 8 DVM-1845/745 Instru

13、ctions for Handling Semi- conductors Electrostatic breakdown of the semi-conductors may occur due to a potential difference caused by electrostatic charge during unpacking or repair work. 1. Ground for Human Body Be sure to wear a grounding band (1 M) that is properly grounded to remove any static e

14、lectricity that may be charged on the body. 2. Ground for Workbench Be sure to place a conductive sheet or copper plate with proper grounding (1 M) on the workbench or other surface, where the semi-conductors are to be placed. Because the static electricity charge on clothing will not escape through

15、 the body grounding band, be careful to avoid contacting semi-conductors with your clothing. CBA Grounding Band Conductive Sheet or Copper Plate 1M 1M CBA 9 DVM-1845/745 CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart This flowchart indicates the disassembly steps to gain access to item(s)

16、 to be serviced. When reassembling, follow the steps in reverse order. Bend, route, and dress the cables as they were originally. 2. Disassembly Method (1): Identification (location) No. of parts in the figures (2): Name of the part (3): Figure Number for reference (4): Identification of parts to be

17、 removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered. P=Spring, L=Locking Tab, S=Screw,CN=Connector *=Unhook, Unlock, Release, Unplug, or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking Tabs (L-2) (5): Refer to “Reference Notes.” ID/ LOC. No. PART REMOVAL Fig. No

18、. REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER Note 1 Top CoverD16(S-1)- 2 Front Assembly D2*8(L-1)1 3 Bracket (Top) D32(S-2)- 4 Stopper Bracket L, R D34(S-3)- 5 Slide Tray Assembly D4 D5 CN5001, CN5004 2 3 4 6 Function CBAD4*2(L-2), CN2201- 1 Top Cover 2 Front Assembly 3 Bracket (Top) 4 Stopper

19、Bracket L, R 5 Slide Tray Assembly 10 Tray Guide (R) Unit 19 DVD Main CBA Unit 17 Changer CBA 18 AV CBA 20 PCB Holder 11 Loading Pulley 12 Slide Tray Gear (B) 13 Slide Tray Gear (A) 14 Motor Assembly 15 Switch CBA 16 Tray Guide (R) 7 Power Switch CBA 8 Rear Panel 9 Tray Guide (L) 6 Function CBA 7 Po

20、wer Switch CBA D4 CN2103, (S-4)- 8 Rear PanelD6 4(S-5), 11(S-6), (S-7)- 9 Tray Guide (L) D7 (S-8)- 10 Tray Guide (R) Unit D7 2(S-9), CN3003, CN3004 - 11 Loading Pulley D8 (S-10), Belt L- 12 Slide Tray Gear (B) D8 (S-11), *(P-1)- 13 Slide Tray Gear (A) D8 - 14 Motor Assembly D8 (S-12)- 15 Switch CBA

21、D8 *2(L-4)- 16 Tray Guide (R) D8 - 17 Changer CBAD9 CN3102, CN3301, 2(S-13) - 18 AV CBAD9 5(S-14), CN1001, CN1601 - 19 DVD Main CBA Unit D10 3(S-15)- 20 PCB HolderD10 - (1) (2) (3) (4) (5) ID/ LOC. No. PART REMOVAL Fig. No. REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER Note 10 DVM-1845/745 Referen

22、ce Notes CAUTION 1: Locking Tabs (L-1) are fragile. Be careful not to break them. 1-1. To release eight Locking Tabs (L-1), first release five Locking Tabs (A), and then three Locking Tabs (B). (Fig. D2) CAUTION 2: Electrostatic breakdown of the laser diode in the optical system block may occur as a

23、 potential difference caused by electrostatic charge accumulated on cloth, human body etc., during unpacking or repair work. To avoid damage of pickup follow next procedures. 2-1. To remove the Chuck Arm, remove the Screw A, two Rotary Tray Washers and Rotary Tray Spring. (Fig. D5) 2-2. Short the th

24、ree short lands of FPC cable with sol- der before removing the FFC cable (CN5004 on the Relay CBA). If you disconnect the FFC cable without shorting them, the laser diode of pickup will be destroyed. (Fig. D5) 2-3. Disconnect the Connector (CN5001). Remove the Slide Tray Assembly carefully. (Fig. D5

25、) CAUTION 3: When reassembling, confirm the three short lands of FPC cable is solderd, and connect the FFC cable (CN5004 on the Relay CBA) completely. Then remove the solder from the three short lands of FPC cable. (Fig. D5) CAUTION 4: Before reinstalling, turn the Slide Tray Gear (B) fully clockwis

26、e. (Fig. D4) (S-1) (S-1) (S-1) 1 Top Cover (S-1) Fig. D1 2 Front Assembly (L-1) (A) (B) (B) (L-1) (L-1) (L-1) (L-1) Fig. D2 3 Bracket (Top) 4 Stopper Bracket R 4 Stopper Bracket L (S-3) (S-2) (S-2) (S-3) (S-3) Fig. D3 11 DVM-1845/745 Slide Tray Gear (B) CN2201 6 Function CBA (L-2) (L-2) (S-4) 7 Powe

27、r Switch CBA CN2103 5 Slide Tray Assembly Turn Fig. D4 Slide Tray Assembly Screw A Rotary tray washer Rotary tray washer B Chuck arm View for A Short the three short lands by soldering. (Either of two places.) FPC Cable A Rotary tray spring Relay CBA CN5001 CN5004 FFC cable from the DVD Main CBA Uni

28、t FFC cable from the Changer CBA View for B (Relay CBA) Fig. D5 12 DVM-1845/745 (S-5) (S-5) (S-5) (S-5) (S-6) (S-6) (S-6) (S-7) 8 Rear Panel Fig. D6 (S-8) 10 Tray Guide (R) Unit 9 Tray Guide (L) CN3004 CN3003 (S-9) Fig. D7 (S-10) Belt L 11 Loading Pulley 12 Slide Tray Gear (B) 14 Motor Assembly 15 S

29、witch CBA (S-12) (L-4) 13 Slide Tray Gear (A) 16 Tray Guide (R) (P-1) (S-11) Fig. D8 CN3102 CN3301 CN1001 CN1601 17 Changer CBA (S-13) (S-13) 18 AV CBA (S-14) (S-14) Fig. D9 13 DVM-1845/745 (S-15) 20 PCB Holder 19DVD Main CBA Unit Fig. D10 14 DVM-1845/745 SLIDE TRAY ASSEMBLY DISASSEMBLY INSTRUCTIONS

30、 1. Disassembly Flowchart This flowchart indicates the disassembly steps to gain access to item(s) to be serviced. When Reassembly, follow the steps in reverse order. Bend, route, and dress the cables as they were originally. 3 Plate Holder 2 4 Plate Holder 3 5 Plate Spring6 Belt L7 Gear Plate 8 Mec

31、ha Cable9 Detector Switch10 Rotary Motor Assembly 11 Relay CBA + Sensor CBA 12 Slot Lever 13 Rotary Stopper 14 Mecha Holder Assembly 15 Motion Gear 16 Loading Pulley 17 Rotary Tray Gear 18 Idler Gear 19 Idler Pad 20 Idler Arm 21 Slide Tray Chassis 1 Chuck Arm 2 Rotary Tray 15 DVM-1845/745 2. Disasse

32、mbly Method (1): Identification (location) No. of parts in the figures (2): Name of the part (3): Figure Number for reference (4): Identification of parts to be removed, unhooked, unlocked, released, unplugged, unclamped, or desoldered. P=Spring, L=Locking Tab, S=Screw, CN=Connector, W=Washer *=Unho

33、ok, Unlock, Release, Unplug, or Desolder e.g. 2(S-2) = two Screws (S-2), 2(L-2) = two Locking Tabs (L-2) (5): Refer to “Reference Notes.” Reference Notes 1. Disassembly note Slide the Rotary Tray slowly in the direction of the front while rotating it. 2. Reassembly note Align the rails on the Rotary

34、 Tray with the slot on the sensor and align pin A with hole A on the Rotary Tray. 3. Reassembly note Re-solder the leads on the Rotary Motor Assembly or the Detector Switch as shown in Fig. MD4. 4. CAUTION: Electrostatic breakdown of the laser diode in the optical system block may occur as a potenti

35、al difference caused by electrostatic charge accumulated on cloth, human body, etc., during unpacking or repair work. To avoid damage of pickup: a. Short the three short lands of the FPC cable with solder before removing the FFC cable (CN5005). If you disconnect the FFC cable (CN5005) without shorti

36、ng them, the laser diode of the pickup will be destroyed. (“View for A” in Fig. MD5) b. Disconnect the two connectors (CN5003 and CN5005) on the Relay CBA. 5. CAUTION: When Reassembly, confirm the FFC cable (CN5005) is connected completely. Then remove the solder from the three short lands of the FP

37、C cable. (“View for A” in Fig. MD5) 6. Disassembly note Remove the spring (P-2). Then remove the Slot Lever with the Rotary Stopper while turning the Slot Lever in the direction of the arrow as shown in Fig. MD6. 7. Reassembly note a. Install the Slot Lever and the Rotary Stopper with spring (P-2) a

38、s shown in “Bottom View of the Slide Tray” of Fig. MD6. b. Align pin B on the Slot Lever with slot B on the Motion Gear. 8. Disassembly note The Mecha Holder Assembly and the Motion Gear should be removed together. 9. Reassembly note The pins, slots or holes on the Mecha Holder Assembly, the Motion

39、Gear and the Slide Tray align as follows: Pin C on the Mecha Holder Assembly with hole B on the Slide Tray Chassis Pin D on the Mecha Holder Assembly with slot C on the Motion Gear Pin E on the Mecha Holder Assembly with cavity A on the Slide Tray Chassis Slot A on the Mecha Holder Assembly with rib

40、 A on the Slide Tray Chassis ID/ LOC .No. PART REMOVAL Fig. No. REMOVE/*UNHOOK/ UNLOCK/RELEASE/ UNPLUG/DESOLDER Note 1 Chuck ArmMD1 (S-1), 2(W-1), (P-1), Magnet, Yoke, Clamper - 2 Rotary TrayMD2 - 1 2 3 Plate Holder 2 MD3 2(S-2), (S-3)- 4 Plate Holder 3 MD3 2(S-4)- 5 Plate SpringMD4 (S-5)- 6 Belt LM

41、D4 - 7 Gear PlateMD4 3(S-6), (S-7)- 8 Mecha CableMD4 6(L-1), *CN5002, *CN5101, (S-8) Lead clamper, Desolder - 9 Detector Switch MD4 Desolder3 10 Rotary Motor Assembly MD4 Desolder3 11 Relay CBA + Sensor CBA MD5 4(S-9), *CN5003, *CN5005 4 5 12 Slot LeverMD6 *(P-2) 6 7 13 Rotary Stopper MD6 - 6 7 14 M

42、echa Holder Assembly MD5 MD6 - 4 5 8 9 15 Motion GearMD6 - 8 9 16 Loading Pulley MD7 (S-10), (W-2)- 17 Rotary Tray Gear MD7 - 18 Idler GearMD7 *(P-3), (S-11), (W-3), (W-4) - 19 Idler PadMD7 - 20 Idler ArmMD7 - 21 Slide Tray Chassis MD7 - (1) (2) (3) (4) (5) 16 DVM-1845/745 (W-1) (W-1) (S-1) (P-1)Cla

43、mper Magnet Yoke 1 Chuck Arm Fig. MD1 1 2 Pin A Hole A Rails on the Rotary Tray Slot on the sensor 2 Rotary Tray Fig. MD2 3 Plate Holder 2 4 Plate Holder 3 (S-2) (S-3) (S-4) (S-4) Fig. MD3 8 Mecha Cable 8 Mecha Cable 9 Detector Switch Detector SwitchDC Mini Motor 10 Rotary Motor Assembly 6 Belt L 7

44、Gear Plate 5 Plate Spring Bottom View of the Slide Tray (S-6) (S-8) Lead clamper (S-7) (S-5) (L-1) (L-1) CN5002 CN5101 yellow black blue red brown (L-1) (S-6) Desolder Desolder Slide Tray (S-6) Fig. MD4 17 DVM-1845/745 11 Relay CBA + Sensor CBA Bottom View of the Slide Tray Slide Tray View for A Sho

45、rt the three short lands by soldering. (Either of two places.) FPC Cable A (S-9) (S-9) CN5003CN5005 Fig. MD5 Fig. MD6 Pin E Pin C Pin B turn (P-2) Pin C Pin E Pin D Pin D Slot C Slot B Slot A Slot A Slide Tray 15 Motion Gear 12 Slot Lever 13 Rotary Stopper 12 Slot Lever 13 Rotary Stopper (P-2) Botto

46、m View of the Slide Tray Bottom View of the Mecha Holder Assembly Rib ACavity AHole B 14 Mecha Holder Assembly 18 DVM-1845/745 Fig. MD7 (P-3) (W-3) (W-2) (W-4) (S-11) (S-10) 17 Rotary Tray Gear 20 Idler Arm 19 Idler Pad 18 Idler Gear 16 Loading Pulley 21 Slide Tray Chassis 19 DVM-1845/745 FLOW CHART

47、 NO.2 The fuse blows out. After servicing, replace the fuse. Check the presence that the primary component is leaking or shorted and service it if defective. Check the presence that the rectifying diode or circuit is shorted in each rectifying circuit of secondary side, and service it if defective.

48、FLOW CHART NO.3 When the output voltage fluctuates. Yes No FLOW CHART NO.4 When buzz sound can be heard in the vicinity of AV circuit. Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side, and service it if defective. (D1003, D1

49、006, D1008, D1016, D1030, Q1002, Q1004, Q1011, Q1014, Q1020, Q1022) Does the photo coupler circuit on the secondary side operate normally? Check IC1001, D1012, D1024 and their periphery, and service it if defective. Check IC1001, IC1006 and their periphery, and service it if defective. FLOW CHART NO.5 -FL is not outputted. Is -24V voltage supplied to the anode of D1003? Check D1003 and periphery circuit, and service it if d