Technics-SJHD-501-Service-Manual电路原理图.pdf
《Technics-SJHD-501-Service-Manual电路原理图.pdf》由会员分享,可在线阅读,更多相关《Technics-SJHD-501-Service-Manual电路原理图.pdf(65页珍藏版)》请在收音机爱好者资料库上搜索。
1、ORDER No.AD9907180C2 Mini Disc Deck SJ-HD501 Mechanism unit: MR3A (RAJ3402) Mechanism Series Colour (N).Gold Type Areas EG.Europe. EB.Great Britain. This product is option for systems of SC-HD301 and SC-HD501. SPECIFICATIONS 1 Specifications SystemMinidisc digital audio system RecordingMagnetic fiel
2、d modulation direct overwrite ReadingNon-contact optical system with Semiconductor laser (=780nm) Sampling frequency: 44.1 kHz Cording system:ATRAC Channel:2channel, stereo Frequency response: 10-20000Hz (0.3dB) S/N Ratio (PLAY):90dB Wow and flutter:Below measurable limit Input Analog input (Level/i
3、mpedance): 500mV/47k Digital input (Optical in 1, Optical in 2) Wavelength: 660nm Output Analog output (Level/impedance): 2.0V/600 General Dimensions (WxHxD): 196x104x237mm Weight:2.0kg Power supply:AC230-240V, 50Hz Power consumption: 12W Notes: 1.Design and specifications are subject to change with
4、out notice. 2.Dimensions and weight are approximate. 3.Total harmonic distortion is measured by the digital spectrum analyzer. 1 2 1. Accessories - AC power supply cord.1pc. - Optical cable.1pc. (RJL1X001B05D) 3 - Remote control batteries.2pcs. R6/LR6 (AA, UM-3) Note:These are available on sales rou
5、te. - Stereo phono cables.2pcs. (RJL2P004B08) - Remote control transmitter.1pc. (EUR645272) 4 2. Precation of Laser Diode 5 3. Caution for AC Main Lead 4. Operating Instructions 5. Handling Precautions for Traverse Deck (MD Unit) The laser diode in the MD unit (optical pickup) may break down due to
6、potential difference caused by static electricity of clothes or human body.So, be careful of 6 electrostatic breakdown during repair of the MD unit (optical pickup). 5.1. Handling of MD Unit (optical pickup) 1. Do not subject the MD unit (optical pickup) to static electricity as it is extremely sens
7、itive to electrical shock. 2. The short land between the No. 25 (LD-GND) and No. 24 (LD) pins on the flexible board is shorted with a solder build-up to prevent damage to the laser diode. (As shown in Fig. 1.) To connect to the PC board, be sure to open by removing the solder build-up, and finish th
8、e work quickly. 3. Take care not to apply excessive stress to the flexible board (FFC). 4. Do not turn the variable resistor (laser power adjustment). It has already been adjusted. Fig. 1 7 5.2. Grounding for electrostatic breakdown prevention 1. Human body grounding Use the anti-static wrist strap
9、to discharge the static electricity from your body. (As shown in Fig. 2.) 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the optical pickup is placed, and ground the sheet. Caution: The static electricity of your clothes will not be grounded through the wr
10、ist strap. So, take care not to let your clothes touch the traverse deck (optical pickup). Fig. 2 6. Operation Checks and Main Component Replacement 8 Procedures 9 10 11 12 13 14 7. Self-Diagnostic Function This unit is equipped with a self-diagnostic function which, in the event of a malfunction, a
11、utomatically display a code indicating the nature of the malfunction. Use this self-diagnostic function when servicing the unit. 7.1. Switching to the Self-Diagnostic Mode 1. Turn the power on. 2. Press and hold the STOP button for at least 2 seconds, and while still pressing the STOP button, press
12、the FWD SEARCH button for at least 2 seconds. (Refer to Fig.1.) The unit enters Self-Diagnostic Mode and is displayed “MD TEST”. Then an error code is displayed, if any. For details of the error codes, refer to Fig.2. In the case of no errors, “-” is displayed on FL. 3. If more than one error exists
13、, the display will sequentially show the respective error codes each time the FWD SEARCH button is pressed. 7.2. Canceling the Self-Diagnostic Mode 1. The Self-Diagnostic Mode can be canceled by pressing the POWER button (POWER) to turn the system off. And then pressing the power button again to tur
14、n it again. 7.3. Clearing the Self-Diagnostic Mode 1. The contents of abnormality display are stored in memory. In order to clear the memory, continue to press the STOP button for at least 5 seconds while in the Self-Diagnostic Mode. The memory will clear. Always be sure to clear this memory after c
15、ompleting repair. Fig.1 15 Fig.2 16 8. Self Check Function This unit is equipped with a self check function which can detect a part of malfunction. Use this function before servicing the unit and check the item as shown below. 8.1. Setting to the Self Check Function 1. Turn the power on. 2. Press an
16、d hold the STOP button for at least 2 seconds, and while still pressing the STOP button, press the REV. SEARCH button for at least 2 seconds. Then the unit enters Self Check Function. (Refer to Fig.3.) Fig.3 8.2. Checking the operation switches 1. When the unit enters the Self Check Function, the FL
17、 display turn off. 2. Press the buttons on the unit except the INPUT SELECTOR button, it displays “-” mark adapted each buttons. (Fig.4 and Fig.5 is shown about a allotment.) 17 Fig.4 Fig.5 8.3. Checking the FL display 1. Press the INPUT SELECTOR button. 2. All buttons works normally except the POWE
18、R button, FL display and LED turns on and off at 0.5 second interval. (Refer to Fig.6 and Fig.7.) Fig.6 18 Fig.7 The Self Check Function can be canceled by pressing and holding the STOP button for at least 2 seconds. 9. Measurements and Adjustments (Laser Power Adjustment) Note: - If you exchange pa
19、rts of MD unit when you repair, you must perform the Laser Power adjustment. 19 - Because this unit uses the optical magnetic recording, the unit outputs over 10 times more laser than a CD player does. In the adjustment mode, the laser is always being output. Therefore, be especially careful not to
20、look laser beam directly or to touch the laser beam when adjusting the unit and checking its operation. 9.1. Necessary Instruments - Laser power meter (LE8010) or cartridge type laser power meter - Test disc (Pre-mastered disc RFKV0006 or RFKV0014) - Recordable disc available on sales route (with mu
21、sic recorded) - Insulated driver for adjustment such as a ceramic driver - Remote control transmitter 9.2. Set the Unit to the Adjustmint Mode 1. Supply power to the unit. 2. With no MD loaded in the player, simultaneously press the STOP button and the FWD. SEARCH button and hold them both pressed f
22、or at least 2 seconds until “MD TEST” appears in the display. (Refer to Fig.8.) 3. At the Self-Diagnostic Mode, press “1” on the players remote control. “RAM LASER” will be displayed to indicate the read power adjustment mode. Fig.8 20 Cautions 1. About handling the MD unit - The magnetic head is a
23、precision unit and is very fragile. Do not deform it. - Laser diode in the optical pickup may be destroyed by the staticelectricity generated in your clothes or body. Be especially careful with the static electricity. - The optical pickup is structured extremely precisely. Do not subject to the stro
24、ng impact or shock. Do not touch the lens. 2. About handling the magnetic head When replacing the magnetic head, do not tighten the mounting screw (RHD17022) too firmly. If the screw is tightened too much to deform the resin, the position of the head is moved, and this affects its recording operatio
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- Technics SJHD 501 Service Manual 电路 原理图