Mattel Drums 5281 User's Manual
Contents
1. lead to the Random Access Memory RAM U2 and also to the keypad matrix on the upper left side of the schematic RAM U2 and the keypad matrix share lines EO Part of the time U2 is sending interrogation pulses to the keypad and the rest of the time it is sending addresses to RAM U2 There are four inputs EO E3 and four outputs GO G3 to the keypad matrix allowing 16 possible combinations These lines are multi plexed but differently from the procedure just described When U1 scans the keypad E an interrogation pulse is sent along line EO first A very short time later a pulse is sent along line E1 likewise for E2 and E3 and then back to U1 senses which keypad buttons are pressed by looking at lines GO G3 For example the Tom Tom 1 Fast button is de pressed An interrogation pulse sent along line E2 is then coupled to line G1 Micro processor U1 has been programmed to know that if G1 is enabled when E2 is interrogated then the Tom Tom 1 Fast button has been depressed The same process happens if more than one keypad button is depressed For example Cymbal Slow and Tom Tom 2 Fast are de pressed U1 first interrogates EO and sees that G3 is enabled U1 now knows that Cymbal Slow is depressed In sequence U1 then interrogates E1 and E2 but does not see any buttons depressed Next E3 is interrogated and U1 sees that G1 is enabled and knows that Tom Tom 2 Fast has been depressed Other f2. Check operation of unit with customer s AC Adaptor Listen for low level hum at settings af the Volume control Chock i customer s complaint that of hom heard we playing Syon mi 10 E 1 as seen from solder side of PC Board Figure 2 T1 In Circuit Resistance 12 Resistance 0 06 ohms 0 37 ohms 0 45 ohms 0 49 ohms 0 28 ohms Figure 3 P C Board Component Layout NOTES ar IA a jiem en Arm um ml T T 3 T T T sa m wel Is 1 ar ce I sat us er 470 Cor 7777771 r CYMBAL CYMBAL wel ECE wa 3 necono Fast l ma l 9 vu ssi CETT HR moe ot E ES umm PLAYBACK er MED LI N E carey ue e mal vx os E E som e bus RIS 10K zm SLOWER FAST EN 3 td mmm mm hb EE n Pede nen f NN lt TE raga im fess messe EE EE ale Tate BASS DRUM LINE ACOENTUNE
3. he FT FTI Foor switch 3 synceass 2 1 2r xocn 2 a T xocn a er 3 r Ta TTT RT GROUND CONNECTION NEEDS MADE TO THE BRASS BASE Figure 4 Schematic RI 04V Sma 155 42 DESIGNATION PCB u u2 va u5 06 u7 02 05 07 08 03 04 06 VRI D1 D27 D28 LED 1 5 Ti RT 8 R14 17 R19 20 R22 25 R28 R31 R62 69 R72 R75 R86 R9 R88 810 813 R18 850 51 R21 R26 R55 R57 R60 R61 R78 R27 R34 R37 R73 R29 R30 R32 R33 R35 R36 R38 39 R42 43 R45 46 R44 R47 R53 R49 R56 R59 871 R74 R76 R79 R82 R89 R90 93 02 3 C6 C23 C3940 C4 C15 C17 C22 C25 C30 c32 PARTS LIST DESCRIPTION PART NUMBER P C Board Assy w parts 5281 9159 IC LM6402 Microcomputer 5281 9019 1C 21144 Random Access Memory 0098 0710 IC Sound Generator Pes 82812219 IC RC4558 Dual OP Amp 0098 1230 IC LM386 Power Amp 0098 1020 5837 Noise Generator 0088 0011 Transistor PN2907 0099 1180 Transistor PN2222 0086 0320 FET 2N5638 0086 0346 Transistor 250975 0086 0343 Diode Zener HZ11B1 0086 0439 Diode IN914 or
4. Check that batteries are fresh and inserted correctly Check that the correct external adaptor is used the tip of the mini plug must be positive the ring sleeve must be ground Check that amplifier is connected correctly and its Selector knob is switched to the correct position Check that the Speaker switch on amplifier is acti vated Check that batteries are fresh and inserted correctly Make sure phono cables are fully inserted in jacks or try a new set of phono cables If an external DC adaptor is used it must be rated for 9 VDC at a mini mum of 200 mA Increase volume on Synsonics Drums unit and de crease volume on amplifier Try a new set of phono cables If using a DC adaptor change C39 and C40 from 1 uF to 10 uF at 16 VDC if not previously completed ON BOARD DIAGNOSTIC TEST ROUTINE A program in microcomputer IC U1 will test U1 U2 RAM LED 1 LED 5 and certain keypad buttons It will not provide definitive test for U3 through U7 PROCEDURE RESULT 1 With power OFF press the three Cymbal keypad buttons 2 Turn on power while holding All 5 LEDs turn on for 1 second down the three Cymbal keys 3 Release the three CymbatKeys Snare LED goes out if U2 is OK Tom Tom 2 LED goes out if memory in U1 is OK 4 Press Stop Record Playback Only Cymbal LED lights Only Snare LED lights Only Tom Tom 1 LED lights Slower Only Tom Tom 2 LED lights Faster Only Bass LED lights Bass All
5. 5281 9179 Label Right Headphone Line Output 5281 4249 15 Label Left Side DC Power Accessory 6281 4239 16 Foot Pad Rubber Ox caw 5281 2289 17 Screw 7 16 short 0405 0466 18 Screw 3 4 long due 0405 0456 Packing Carton individual 5281 9219 Packing Material Bubble Material 5281 0660 Instruction Book 5281 0920 FTA 1182 2M GMN Printed in USA
6. allow about 2096 of the signal on the Right Channel to blend with the Left Channel and about 20 of the Left Channel to blend with the Right Channel This provides a surround effect to the sound simulating the effect that the ear further away from the sound source will hear less volume than the ear closer to the source The Output Level Control adjusts the level to the output stages C25 and C26 for U5 and C17 and C18 for U6 act as a bandpass filter to attenuate excessively low or high frequencies US Left Channel and U6 Right Channel amplify the signals to drive Headphones or any other external equipment such as a guitar amplifier or stereo system R56 C27 Left Channel and R59 and C20 Right Channel provide immunity from RF energy being sent Channel and R60 and R61 Right Channel reduces the signal from the Line Out jacks to line level to the output equipment R55 and 57 Left PRELIMINARY CHECKLIST Before you refer to the TROUBLESHOOTING section which follows look at this list of possible solutions Then if any problem persists you should be able to correct it by referring to the TROUBLESHOOTING section SYMPTOM 1 No sound from Synsonics Drums unit LEDs do not light 2 No sound from Synsonics Drums unit LEDs light when unit is played 3 Loud hum from Synsonics Drums unit immediately upon turn on 4 Low volume hum is heard when Synsonics Drums unit is turned
7. 5 LEDs light for 2 seconds then turn off DISASSEMBLY 1 Place the Synsonics Drums unit upside down drum pads facing down protecting it from scratches by a piece of cloth or piece of carpeting 2 Remove 5 short and 3 long screws which attach the lower housing to the upper housing 3 Lift lower housing straight up and away from the upper housing 4 using batteries for testing wrap pieces of cellophane tape around them and the battery tray 5 The PC Board may be lifted upwards without removing any connectors To remove the PC Board first disconnect J6 from its connector in the center of the PC Board 6 To access the piezoelectric transducers first lift the PC Board Then lift the suspect drum head and remove its four grommets Separate the two halves with your fingers to reveal the transducer 7 During reassembly the wires in the ribbon cable must loop around the LEDs Otherwise the PC Board will not seat properly IMPORTANT Damage to the Upper Housing will result if the screws are not replaced exactly as shown in the Exploded View Figure 1 DISASSEMBLY NOTES Figure 1 Exploded View TROUBLESHOOTING Starting at Step 1 follow each test in numerical order The correct voltage or waveform being measured will lead you to the next step an incorrect measurement will lead you to the defective component Test the unit by placing it upside down drum pads towards table with the
8. bottom housing removed Clamp the Board against the upper housing with your fingers You will be able to lift the front of the unit and activate the various drum pushbuttons and drum pads Test Spasonics Drums folowing procedure tined Disassemble unit as described in Disassembly ae Sot Power Switch to af Using fresh i a BV et in Operating Instructions s Unit Fails Instructions arapa pr ne Unit Posses VOG nat OK correctly with yeas Dm m ao Chocks may comparten tel VO Dad ec U LEE axtamal VOC adaptor is connected to Ting to common heck osha P G nacas shorted 5 08 or Tum Power Switch on and measure about 8 VOC at TP 2 a rm m Cheek S1 and D28 Check 05 and QB for shorts Cheek continuity af TI ATI and 033 Check substitution Figure 2 034 R78 1 05 and 08 by Waveform OK Chock for 8 VOC at TP 4 5 VOC at TP 5 and S VOC at TP 6 Voltage OK not OK nt Scope for 4 Vp p at about 150 kHz at TP 7 Signal not OK Signal OK For 8 VDG check 025 VOC chack 026 and 36 9 VOC check 027 037 and H probem is not found M the cathode end of D25 and 028 and anode of 027 If voltage retums than shorted component or trace exists on Board Chaek R21 and CT Chack by abc wih known good one Scopo for corect waveforms at TP 8 TP 9 10
9. ADDITIONAL INFORMATION CON CERNING THE OPERATION OF THE SYN SONICS DRUMS REFER TO THE OWNER S OPERATING INSTRUCTIONS SYNSONICS DRUMS TECHNICAL DESCRIPTION The Synsonics Drums is a musical instrument which electronically synthesizes the percus sive sounds of the cymbal snare drum 2 dif ferent tom tom drums and a bass drum Additionally three memories are provided to allow the storage of drum patterns Referring to the Synsonics Drums schematic Figure 4 a 9 volt source available from internal batteries or from an optional external source powers the unit The power source is fed to polarity protection diode D28 and to power switch S1 A unique circuit called a DC to DC converter is composed by Q5 Q6 T1 R78 C34 R77 and other associated cir cuitry These components form an oscillator operating at about 100KHz T1 being multi tapped has various voltages available at its secondaries These voltages are rectified and filtered generating the 9 VDC 5 VDC and 9 VDC needed to operate the various circuitry Overvoltage protection zener diode VAT senses the 9 VDC line so that if peaks exceed 10 4 V increased negative bias on NPN tran sistor Q5 will decrease the output voltage A technique called multiplexing is used several times in the Synsonics Drums In multiplexing one line or group of lines is able to carry sig nals for use by different parts of the system at different times For example output lines
10. MATTEL ELECTRONICS SERVICE MANUAL SYMSONMICS DRUMS MODEL 5281 MATTEL ELECTRONICS 5150 Rosecrans Aver Hawthorne itor nia 30250 SYNSONICS DRUMS SERVICE MANUAL TABLE OF CONTENTS Operating Instruction ge eei se eben DARI sie o oop ea e e 1 T echnical 2 Preliminary Checklist On Board Diagnostic Routine Disassembly ax une A a 6 Figure 1 Exploded View 3 fi Troubleshooting Procedure 8 Figure 2 T1 Iri Girouit Resistainca u ia a e 12 Figure 3 P C Board Component Layout Figure 4 Schematic Parts List TOOLS and TEST EQUIPMENT REQUIRED e Basic Electronic Hand Tools e Digital Multimeter DMM 10MHz Triggered Oscilloscope e 6 1 V Alkaline C size Batteries or e Stereo Audio Amplifier and Speakers 9 VDC Power Supply OPERATING INSTRUCTIONS To Play Drums To Record 1 Plug stereo headphones into the HEAD 1 There are 3 separate memories in the PHONE jack of the Synsonics Drums or Using phono cables plug the OUT PUT jacks of the Synsonics Drums into the Aux in or Tape in jacks of a stereo amplifier Turn the Selector knob or the Tape selector to choose the Synsonics Drums as the signal source 2 Turn OFF ON VOLUME control to ON and set Volume to mid position Set the Volume control on the stereo amplifier to mid position 3 Strike the four drum pads with fingers or dru
11. and TP 11 Waveform not OK Lift P C Board away from rubber kaypad Chock for shorted contacts where the keypad meats P C Board Scope these Test Points with P C Boord ted if waveform returns replace keypad not replace UT then UZ Waveform OK Check for comet waveforms at TP 12 TP 13 14 and 15 when each of the keypad anf pred Si ql con Clean keypad contacts on P C Board with denatured alcohol remove power Chack diodes 01 016 A Check cbr ead by end A1 substituting own gno on U Perge Wi god on Waveform OK ck that voltage drops fom 5 VOC to 0 V at TE 1 and TP 10 when Stop Bass nd Accent ara depressed respectively No Yes Check for corect waveform at 19 Wavelorm OK Clean keypad contacts on P C Board with denatured Alcohol remove power Check R14 R18 Check rubber keypad by substituting with a known good om hack RIB Check OI by stung with a known good one Check UT then U2 by sub sitting with a known good one Check that LED 1 through LED B appropriate Keypad button i pre jf when thoir Check that conect waveform appears at TP 20 TP21 TP 22 and TP 23 whon a Cymbal S Tom Tom 1 and Tom 2 button respectively Waveform rot OK Check D17 D21 RO R13 and LED 1 LED 5 Check Q1 by substitution Than if only Bass LED ails to light replac
12. e UT then U2 Check ROB 89 Replace UI then U2 with a nown good one Wavelom OK Check that waveforms at TP 24 und TP 25 an corect Wavelom OK Waveform nat OK Check lor a Vp p sine wave that decays rapidi 0 13 and 16 of U3 whun Cymbal fom 2 and Snare dumpads am hit special Waveform OK ma not OK Check R74 and R75 Replace Ut then UZ with a knawn good one Check RO R93 Replace appropriate transducer in dumpad Check U3 by substitution Step 3 review correct operation of cheek OK replace UT Check for correct waveform at TP 36 when Bass Drum is activated For TP 32 check RIS R38 and For TP 33 check R88 07 C12 R72 R73 R30 R28 R28 022 and 23 For TP 34 check B2 R42 and CS For TP 35 check R89 08 RBG R44 C14 E13 and RAS all components test OK then replace U3 fan etal sum into the Loft and Aight Line Out jocks Check for normal sound os is played Sat Volume to maximum Check for correct waveform at TP 39 when Bass Tom 1 and Snare keypad butions aro depressed cf stereo headphones into Headphone Calc d chee sede Specs Drums are played Check R67 and ROT Check continuity of J2 and Check R52 RAO C25 C20 C27 RGB and C39 Check US by substitution hk C21 C29 RSS and BO Check conii
13. elease the Record and Cymbal Memory keys 3 After a second delay all 5 LEDs will light to indicate the recording process has started Strike any of the drum pads and or any of the drum control keys to record their sound in memory WHEN USING THE DRUM PADS TO RE CORD BE SURE TO STRIKE THEM HARD ENOUGH TO LIGHT THE LEDs If an LED does not light the sound for that drum has not been recorded 4 After 16 beats the memory will return to the first beat of the loop It then replays the pattern you recorded adding to it any new beats you may play When a loop replays you will hear everything recorded in previous loops 5 The memory loop will repeat until halted by pressing STOP Once you press STOP you cannot add to a memory loop The next time you activate record in that memory it will be erased to make room for a new pattern ALL MEMORIES ARE AUTOMATICALLY ERASED WHEN THE SYNSONICS DRUMS IS TURNED OFF To Playback From Memory 1 Hold down the PLAYBACK key while pressing one of the 3 Memory keys Remember that the 3 Cymbal keys double as memory keys The drum sequence stored in that memory will immediately start playing back 2 Pressing TEMPO SLOWER orFASTER will gradually change the overall tempo or speed of playback 3 Synsonics Drums will continue to play back the memory loop until the STOP key is pressed Pressing STOP to end playback will not erase the contents of a memory FOR
14. es 0099 1040 Diode 14001 0099 1030 Light Emitting Diode MV5053 0086 0437 Transformer TY77 0089 0554 Resistor 10K ohm 5 1 AW mmt 0095 1020 Resistor 470 ohm 5 1 4W CF 0095 0701 Resistor 200 ohm 5 1 4W 0095 0610 Resistor 4 7K ohm 5 1 4W eee eget sees 0095 0940 Resistor 39K ohm 2 1 AW CF 0084 0441 Resistor 1K ohm 5 1 4 0095 0780 Resistor 120K ohm 5 1 4W 0095 1280 Resistor 1 2K ohm 5 1 4W 0095 0800 Potentiometer 50K Tuning 0084 1360 Resistor 5 6K ohm 5 1 4W 0095 0960 Resistor 82K ohm 5 1 4W 0095 1000 Resistor 12K ohm 5 1 4W 0095 1040 Resistor 390K ohm 5 1 4W 0095 1400 Resistor 220K ohm 5 1 4W 0095 1340 Resistor 130K ohm 5 1 4W 0095 1290 Resistor 20K ohm 5 1 4W f 0095 1090 Potentiometer 10K ohm Volume w switch 0084 1370 Resistor 10 ohm 5 1 4W 0095 0300 Resistor 100K ohm 5 1 4W 0095 1260 Resistor 2 2K ohm 5 1 4W 0095 0860 Resistor 47K ohm 5 1 4W 0095 1180 Resistor 3 3K ohm 5 1 4W 0095 0900 Resistor 3 9K ohm 5 1 4W 0095 0920 Resistor 68 ohm 5 1 4W CF 0095 0501 Resistor 75K ohm 5 1 4W 0095 1230 Capacitor 100 pF 10V Cer 0085 0749 Capacitor 10uF 16V Elect 0085 0020 Capacitor O 1uF 12V Cer 0096 4090 REF DESIGNATION DESCRIPTION PART NUMBER 5 Capacitor 0 68
15. m sticks The harder the drum pads are hit the louder the sound produced 5 4 Another way to produce drum sounds is with the drum control keys Each group of three keys corresponds to one of the four drum sounds The first left key in each group will give a slow drum roll the second middie key will give a medium speed drum roll the third right key will give a fast drum roll 5 The Bass Drum may be played by pressing the BASS OFF ON key Pressing this key a second time will turn off the bass drum 6 For a closed cymbal or high hat sound hold down the ACCENT key while striking the Cymbal drum pad or pressing one of the three Cymbal control keys 7 Tom Tom 1 can be tuned over 5 octave range Adjust the TUNING control on the left side of the unit while striking the Tom Tom 1 drum pad until you reach the desired pitch 8 The tempo or speed of the bass drum can be varied by pressing the TEMPO SLOWER or FASTER control keys Hold down either Faster or Slower key to produce a gradual speeding up or Slowing down of the tempo When the bass drum reaches the desired tempo release the key fe Synsonics Drums Each memory consists of a 16 beat loop with each beat counted off by the bass drum The duration of a memory loop is determined by the Tempo of the bass drum 2 recording hold down the Record kev while pressing one of the 3 Memorv keys The 3 Cymbal keys double as memo keys R
16. n to accept drum signals and when to reset their state by the Read Write and Reset lines respectively Clock signals for U1 are generated by C1 and R21 at approximately 150KHz Custom programmed Read Only Memory ROM within the U1 tells the microprocessor when and how to perform the various functions to make the Synsonics Drums operate Among these functions are Writing into and reading out of RAM U2 interrogating and sensing the keypad matrix receiving and sending signals along the bi directional Drum Sound Chip bus setting the Tempo faster or slower and generating Accent and Bass Drum signals these will be discussed next Signal input for Drum Sound Generator U3 may come from the four drum pads or from the keypad matrix or memory both through U1 As stated before signals from the drum pads travel to U1 through the Drum Sound Chip bus during record The signal from the Cymbal travels to U1 only via pin 8 on U3 Snare travels to U1 only via pin 17 on U3 and so on The same procedure follows during playback from U1 Cymbal travels to U3 only via pin 37 U1 Snare travels to U3 only via pin 38 on U1 and so on Within U3 are Voltage Controlled Oscillators VCO and Voltage Controlled Amplifiers all helping to create the unique sound of each instrument The frequency of a VCO varies with changes in the DC control voltage applied to it In a VCA the gain is adjustable by varying a DC control voltage F
17. ollowing U3 are waveshaping circuitry and U7 a white noise generator U7 produces the signal that gives the snare drum and cymbal their characteristic hissing sound This noise source is coupled to the snare and cymbal outputs of U3 through Q3 cymbal and 4 snare Each output of U3 is at a very low level on the order of 10 mV Each output feeds some amplifying scheme to increase the level suf ficiently to drive the next stage Q7 amplifies the output of Tom Tom 1 and Q8 amplifies the output of Tom Tom 2 For Tom Tom 1 C12 R73 R72 C11 and R39 provide the waveshap ing characteristics For Tom Tom 2 R44 R86 C14 C13 and R43 provide the waveshaping characteristics Q4 modulates the waveform produced by C9 R35 C10 and R36 with the hiss produced by U7 Q3 modulates the wave form produced by C6 R33 C7 and R34 with the hiss produced by U7 If Accent transistor Q2 is enabled then C6 is damped by R32 shortening the time constant and making the characteristic high hat sound Bass drum originates in U1 as a square wave and pulls C15 to ground through R26 and D24 forming a thump sound Cymbal and Tom Tom 2 are coupled to the Right Channel while Snare and Tom Tom 1 are coupled to the Left Channel Bass Drum is coupled to both the Left and Right Channels equally Next in line are U4A and U4B which sum the various inputs on each channel and act as a low pass filter The matrix formed by R48 R50 R51 and R52
18. uF 12V Poly 0085 2640 C7 Capacitor 100pF 12V Cer 0096 3340 C8 C12 C14 Capacitor 16V Elect 0085 0007 Capacitor 2 2uF 12V Elect 0097 2530 10 11 C13 Capacitor 0 01uF 12V Cer 0096 2020 C16 C18 C24 C26 Capacitor 470pF 12V Cer 0096 3500 C20 C27 Capacitor 0 05uF 12V Cer 0096 4070 C21 29 Capacitor 470uF 12V Elect 0097 2150 c33 Capacitor 0 0022uF 12V Poly 0096 1560 C34 Capacitor 1000pF 12V Cer 0096 3530 C35 C37 Capacitor 33uF 12V Elect 0097 2580 C36 Capacitor 220uF 12V Elect 0097 2130 C38 Capacitor 330uF 12V Elect 0097 2620 JI Jack External DC Adaptor 0089 0113 J2 J4 Jack RCA Line Out 0089 0111 3 Jack Headphone 0089 0112 J5 Jack 5 pin DIN 0089 0110 J6 Jack 8 pin Header 0089 0032 Stereo Cable 0089 0030 1 Keypad Rubber 5281 2319 2 Transducer Piezoelectric 0099 1390 3 Ribbon Cable 5281 4519 4 Housing Assy Upper ine Inlay 5281 9119 5 Drum Case Assy Upper incl Pad 5281 9149 ES 6 Drum Case Lower Vs 5281 9169 7 Battery Tray Assy incl Contacts 5281 9139 Spring Conical battery contact 5281 4379 Contact Battery contact 5281 4429 8 Support LED Short Bass Drum 5281 6459 9 Support LED Long 5281 6449 10 Knob Volume and Tuning 5281 2599 11 Label Keypad 5281 4259 12 Housing Assy Lower incl Battery Door and Label 5 5281 9109 13 Battery Door Assy incl foam
19. unction buttons used are Stop used during record or playback Bass and Accent for Cymbal which pull lines HO H1 and H3 respectively to ground They are not part of the 4 x 4 matrix described above LED 1 through LED 5 illuminate any time that their drum function is played The signal may originate from the four drum pads keypad switches or U2 Two things must happen for one of these LEDs to light One its interrogate line EO E3 FO for Bass LED must be a logic low and two Q1 must be turned on For example if the Record keypad button were depressed we would not want LED 2 to light U1 then would not enable Q1 if Record was depressed One signal source is the keypad matrix which has been already discussed A second source f is the drum pads Mounted directly below each drum pad is piezoelectric transducer It converts mechanical movement the striking of a drum pad into an electrical voltage The drum pads are input sources to the Drum Sound Generator IC U3 Signals from the drum pads going to Microprocessor U1 travel along the bi directional Drum Sound Chip Bus at pins 6 8 15 and 17 of U3 The micro processor is a digital device but the output of the piezoelectric transducers is analog For recording the drums pads must be hit hard enough to set latches in U3 at this bus This is why the musician must hit the drum pads hard enough to cause the LEDs to light during recording U1 tells the latches in U3 whe
Download Pdf Manuals
Related Search