DENON drm10 维修电路原理图.pdf

DENON SERVICE MANUAL STEREO CASSETTE TAPE DECK MODEL DR-M10 NIPPON COLUMBIA CoO, LTD. 收音机爱 好者资料库 RadioFans.CN TABLE OF CONTENTS FEATURES . 0c eeee- s cdibiahe sid ctetssut cate aes wea eee eA ese SDEGIFICATIONS a anwechushtaucercedeee eens senate BLOCK DIAGRAM .- nneduepaka Sen enaneeeee ae LEVEL DIAGRAM .-. deyteacdeminiea es Dee oRa eT Mae PART NAMES AND FUNCTIONS .-.0eeeee rece er ee reer e tees DISASSEMBLY INSTRUCTIONS .-.002e rere renee renee ADJUSTING AND CHECKING THE MECHANISM SECTION .-+- ADJUSTING THE ELECTRICAL SECTIONS .00+e creer eens PARTS LIST OF P.W. BOARD .-.eeceeeee reeset errr cee streets PARTS LIST OF EXPLODED VIEW .- 00 ee eeer eee terete er enes =XPLODED VIEW OF CABINET AND CHASSIS GROUP .-.+- PARTS LIST OF MECHANISM 15 UNIT AND P.W. BOARD .- +: EXPLODED VIEW OF MECHANISM 15 UNIT. . 00-0 eee ee rete WIRING DIAGRAM eiraccii W. BOARD OF KU-5630 AUDIO AMP UNIT. . 02+ seer errr etn P W. BOARD OF KU-5700 MECHANISM UNIT .- 000 ee seer rete SCHEMATIC DIAGRAM OF MECHANISM UNIT .- 20 see errr FEATURES = Computer-controlled servo technology | Silent, soft-touch controls provide maximum ease-of-use. * Computer-controlled, full-logic tape controls enable fool-proof operation. w Music Search system = Tape counter Dolby-C noise reduction systems. = Extended range, dual-color peak meters. m Auto tape selector. ms Bias fine adjustment. 收音机爱 好者资料库 RadioFans.CN SPECIFICATIONS Type Heads Motors Tape speed Fast forward, rewind time Recording bias Overall S/N ratio (at 3% THD level) Overall frequency response Channel separation Crosstalk Wow PD UIUIMS UL Y QOlUL GOIML - oso svi ray Ky NIVS J : LOLLY Ck) bd yOLydL tren | <a? Lama | ae re . Zbl cOlly eziu | OW3H d/ rdv svid dos, sig) = dwy 93y rav Niv9 o3u duy 0g JaLaw Gat , 4aiya YN Aqjod cOlLY P01 ray NIV YaLaW cf - hh a = 1 0 HEADPHONE OUT Rech O 8Q 5mw +0.4dB oun : 3,3dB = Rearrange fi, 9 arse a ee OdB : 0.775V 400HzZ 200nwb/m RECORDING SYSTEM INPUT VR VR301 LINE INPUT (Lech) (dB) +10 -16.2dB i2Omyv -30 -40 -50 -60 -70 OdB : 0.775V 7 4-=8 iC101 DOLBY NR SYSTEM IC RT103 ae REC EQ AMP REC HEAD (Leh) 43 IC201 (Reh) TRIO6 TRIOT +1.2dB Normat 5.2dB +3.4dB Cro2 +4.9dB Metal -16.5dB -19.1dB Normat “17.1dB CroO2 -15.7dB Metal PART NAMES AND FUNCTIONS Pete SILENT ME CAAR SD DENON MTO Tare SELECT 1. POWER switch Controls the supply of AC power to the deck. One push turns the deck on, a second push turns it off. The deck remains in a stand-by (non-operative) mode for approxi- mately 4 seconds after it is switched on. 2. EJECT button Press this button to eject the cassette. When the deck is operating (tape is running), press the stop ( Ml) key first to stop the tape transport; then press the EJECT button. 3. CASSETTE COMPARTMENT COVER If this compartment cover is not closed completely, the decks transport controls will remain inoperative. 4. TAPE COUNTER The number in the counter indicates the amount of tape wound up. 5. DOLBY NR switches The left Dolby NR switch activates (in) or deactivates (out) the decks Dolby noise reduction circuitry. The right switch selects between Dolby B-Type (out) or C-Type NR (in.) 6. PEAK METERS These meters indicate recording or playback peak levels for each channel. 7. TAPE SELECT indicator This indicator light is interlocked with the Auto Tape Select feature which automatically adjusts the deck to the type of tape in use. (NORMAL, CrOz2, or METAL). 8. OUTPUT LEVEL control This control adjusts playback, recording monitor, headphones output levels for the both channels simultane- ously. and 9. NR SYSTEM indicator This indicator light is interlocked with the Dolby NR switch and informs the user that Dolby NR is In use as well as which (B or C) Type. 10. INPUT LEVEL controls These controls are used to adjust recording levels for each channel. The front contro! is for the left channel; the rear control for the right channel. 11. PHONES jack; For private music enjoyment without disturbing others, or for monitoring a recording, a set of headphones may be plugged in. Impedance should be from 8 to 1200 ohms. 14. Tape transport controls p PLAY KEY m STOP KEY dq REWKEY pp FF KEY REC RECORD KEY 1, PAUSE MUTE 1) PAUSE/MUTE KEY Press to playback tape. Press to stop tape in any mode. Press for fast rewind. Press for fast forward tape winding. To begin recording, press the RECORD and PLAY keys Si pressed, the deck is placed in the REC PAUSE (record standby) mode. The PAUSE key causes the tape to stop momen- tarily during recording or to mute the recording input to create blank (non-recorded) portions on the tape. 12. RESET button Operation of the button resets the counter to all zero. 13. Bias Fine ADJ. control (for NORMAL and CrO, tape) Adjust the bias according to the tape characteristics. Standard biasing is obtained at the center click-stop posi- tion, multaneously. If only the RECORD key is Mechanism circuit board side DISASSEMB LY INSTRUCTIONS 4P connector CN2 7P connector CN3 1. How to Remove the Front Panel Note: When assembling, check to make sure the con- (1) Unscrew the 4 screws (1 10) from both sides of the top nectors are inserted correctly. cover (36) and take off the top cover by pulling it up. (2) Press the eject knob (16), open the cassette window (6) Pull out the power switch lever (29) from the power (35) and take off, as shown in the diagram. switch (39). Note: Be careful when handling the cassette window, (7) Remove the eject knob (16). as it is easily scratched. (8) The mechanism can be removed by holding the mecha- (3) Remove the connector (5P) with lead wires, which runs nism and pulling up. from the control circuit Board (35) to the mechanism Note: When assembling, do so after the following circuit board, from the mechanism circuit board. checking. (4) Remove the counter belt (28). 1. The 2 stay holes on the lower side of the (5) Unscrew the 3 upper screws (3x8 CFTS S tight) (107) mechanism unit are matched with the from the front panel (18) and the 3 lower screws chassis protrusions. (3x8 CBTS P tight) (108). 9. The chassis guide hole are matched with the (6) By pulling out the Front Panel forward and spreading protrusion on the lower side of a stay. out the 2 hooks holding the upper side of the Meter 3 The Head wire is not placed between mecha- Circuit Board (3-4), The Meter Circuit Board can be nism unit and the chassis. removed and you can take out the Front Panel for- ward. Note: When assembling, do so while checking to make sure the Button shaft (22) are matched per- fectly with the extreme point of the push switch lever (27). (36) 3. Removal of Counter (1) Remove Top Cover (36) and Front Panel (18). (Refer to Section 1) (2) Counter Holder (25) is fixed to the Front panel (18) by 2 hooks. By spreading out the hook on the lower side of this Counter Holder (25), you can take out the counter (26) in the built-in condition. 2. How to Remove the Mechanisms (1) Remove the top cover (36) and the front panel (18). (Refer to section 1) (2) Unscrew the 2 mechanism holding screws (3x8 CBTS 5S tight) (109) from the bottom surface of the chassis (1) (3) Unscrew the 2 screws (3x6 CBTS S tight) (102) hold- ing the angle (8) and the mechanism and the 3 screws (3x8 CBTS P tight) (101) and remove the angle. (4) Remove the screw (3x8 CBTS P tight) (101). Holding the mechanism unit (5) to the chassis (1) from top. (5) Remove the connectors with lead wires, which runs from the mechanism circuit board, from the circuit board. Audio circuit board side 3P connector CN302 CN303 6P connector CN301 Counter Holder Front Panel (3) Counter (26) is fixed to the Counter Holder (25) by (5) Remove the various connectors from the Audio Circuit 3 hooks. Board and the Logic Circuit Board. By spreading out the 3 hooks of the Counter Holder (6) By removing the 2 screws (3x8 CBTS, P tight) holding while pushing the pulley on the bottom side of the the Audio Circuit Board (31) and washer (111) and Counter, you can take out the Counter. spreading out the 2 hooks (located at right, left) on the chassis holding the audio circuit board to the direction arrow shows, the audio circuit board can be removed forward. Note: Most repairs to the audio circuit board can be performed by removing the bottom cover on the chassis. Refer to the above procedure only when necessary. Push Counter Pulley Hook 4, How to Remove the Control Circuit Board (1) Remove the top cover (36) and the front panel (18). (Refer to Section 1) (2) By unscrewing 4 screw (2.6x8 CBTS P tight) (106) holding the control circuit board (35) and loosening the 2 screws (3x8 CBTS P tight) (101), the control Circuit board and control button (19) can be removed. 6. How to Remove the Power Switch Circuit Board Note: 1) When replacing the tact switch (38), always (1) Remove the top cover (36): (Refer to section 1) check to make sure that it is not floating (2) Pull the power switch lever (29) out of the power above the circuit board. If it is floating, the switch (39). switch will be in the on condition when the (3) By unscrewing the 1 screw (3x8 CBTS P tight) (101) set is assembled. holding the bracket (15) of the power switch circuit 2) Please check to make sure that the tact board (37) the power switch circuit board can be switch is operating correctly after as- removed upwards. sembled. O 8 5. How to Remove the Audio Circuit Board (1) Remove the top cover (36) and the front panel (18). (Refer to section 1) (2) Pull out the volume knob (A) (32), the volume knob (B) (33), and the 2 volume knobs (C) (34). (3) Unscrew the nutsholding the input volume (32), the output volume (4), and the bias volume (36) and remove the metal fittings holding the headphone jack (3-3). (4) By removing the 2 screws (3x6 CBS S tight) (102) holding the angle (8) and the 3 screws (3x8 CBTS P tight) (101), the angle and the volume holder (4) can be removed. ADJUSTING AND CHECKING THE MECHANISM SECTION 1. Replacing the Pinch Roller (14) Before replacing the pinch roller, clean the tape contact surface of the pinch roller and the capstan shaft. Most causes of poor tape transport can be traced to dirty pinch rollers and capstan shafts. The pinch roller (14) can be removed by removing the spring (13) and the slit washer (106). After replacing, run a padless C-90 tape to check for tape curls at the tape guide section of the head. 2. Checking the Pressure Force of the Pinch Roller In the playback mode, hook a spring weight onto the bracket at the center of the pinch roller. After separating the pinch roller from the capstan shaft, allow the pinch roller to contact the capstan shaft again. Check to make sure the spring weight reads between 300 400g when the pinch roller starts to rotate. If it is not within the normal range, replace the pinch roller spring (13). l 300g 400g it = zt ra) sa 3. Replacing the Record/Playback Head (1) How to remove the R/P HEAD. 1) Remove securing screw (101) and azimuth adjust- ing nut (102) from the record/playback head. 2) Remove the soldered head wire and disassemble the mechanical unit to remove the record/play- back head. (2) How to assemble the R/P HEAD. Reverse the above (1) procedures for removing the R/P HEAD. *Solder the HEAD WIRES according to the diagrm. 4. Adjusting the R/P HEAD Azimuth adjustments . Play back the TEAC MTT-114 test tape. Turn the azimuth adjustment nut and adjust so that A of the resurge wave from is maximum and B is minimum. * After the adjustments, apply anaerobic adhesive on the positions indicated in the diagram. Note: Only the azimuth adjustment is necessary; no height adjustments are required. Anaerobic adhesive Head adjust spacer ) Note: Be sure to mount the head adjust spacer. 5. Replacing the ERASE HEAD (6) (1) Unscrew the erase head holding screws (103). (2) By unsoldering the HEAD WIRES can be taken off the mechanism unit. 240 6. Checking for Axis Direction Movements of the Capstan Shaft Hold the capstan shaft from the front of the mechanism and move it in the axis direction; check to make sure some movement exists. 7. Checking the Take-up Torque Load the cassette type torque meter. Check to make sure that the torque meter average reading is within 35 75 g-cm during playback. If it is not within this range, check the voltage (2.5 3V) of the reel motor. If the voltage is low, the torque will be weak; if it is high, the torque will be strong. In addition, check for reel thrust movement in section 8. 8. Adjusting the Reel Thrust Movement Check to make sure that the reel thrust movement is within 0.2 0.4 mm. 9. Checking the FF and REW Torques * When using the cassette type torque meter. Check to make sure the torque meter indicates more than 70 g-cm at the end of FF and REW. When using a modified cassette half. Load the modified cassette half; hook the end of the dial tension meter (full scale 100300 g) onto the tri- angle section. In the FF (REW) mode, feed the tape in at a rate somewhat slower than the take up speed. Check to make sure the dial tension meter reads more than 60 g-cm. 10. Checking the Back Tension Torque During Record/Play back Load the cassette type torque meter; check to make sure the torque meter reads between 25 g-cm during playback and that there is no unevanness. If it is not within this range, check the section on adjusting the reel thrust movement; or else replace the spring (15). 11. Checking the FF and REW Times Load a C-60 cassette tape; check to make sure the tape is fast forwarded or rewound within 70110 seconds. If it is not within this range, check sections 8 and 10. 12. Checking the Operation of the Erase Preven- tion, Metal and Chrome Switch Confirm that the leaf switch properly detecting the tape type detection holes on the cassette housing. 13. Checking the Gap Between the Pulse Detec- tion LED and the Reel Assy Check to make sure the gap between the surface of the shutter section of the reel assy and the LEDs is approxi- mately 1mm. ee LED Approximately 1mm af) es ADJUSTING THE ELECTRICAL SECTIONS Measuring instruments necessary for adjustments (1) Audio signal generator (2) Variable resistance attenuator (3) Electronic voltmeter (4) Oscilloscope (5) Frequency counter (6) Adjustment screwdriver (7) Trap coil adjustment square stick (8) Test tapes (TEAC MTT-111, MTT-114, MTT-150) (A-BEX TCC-262) (DENON HD7E/60) (9) Transport Check cassette tape (SONY MC-112C) Caution on adjusting (1) Before adjusting, clean the head surface, capstan and the pinch roller with a gauze or a cotton swab moisten- ed with alcohol. Demagnetize the R/P HEAD and the E, HEAD with a head eraser. (3) Completely demagnetize the adjustment screwdriver.