SERVICE MANUAL -'
Contents
1. MONOPHONIC SYNTHESIZER SERVICE MANUAL 5 CIFICATIONS 3 CIRC UIT D KLM 126B rts not listed BLOCK DIA ADJUSTMENT PROCEDURE KEIO ELECTRONIC LABORATORY CORPORATION TOKYO JAPAN 1 SPECIFICATIONS lt CONTROL SECTION gt 1 Keyboard 2 Voltage controlled oscillator 3 Voltage controlled low pass fitter F C 32 2 2 3 octaves Scales 32 16 8 4 1 6 octaves Wave form AN PW PWM 4 modes PW adjust PWM intensity Pitch 1 OCTAVE OR MORE portamento Frequency modulation intensity by MG Frequency modulation intensity by EG EXT Cut off frequency s Peak sell OSC Cut off frequency modulation intensity by MG Cut off frequency modulation intensity by EG EXT 4 Envelope generator Hold time 5 Modulation generator 6 External input 7 Manual controller 8 Power SW volume Attack time Decay time Sustain level Release time Wave form N A IM TU LN CONTINUALLY Frequency Signal level adjust Control wheel CENTER CLICK STOP Volume lt PATCH PANEL SECTION gt 1 Keyboard 2 3 4 7 Noise generator 8 Manual controller 9 Signal out Keyboard control vollage output exponential OV 8V Keyboard trigger output 4 VCO control voltage input linear response OV 8V External2. MS 1004 5 1005 9P 5 1006 MLR O3TRC 1 MLA 03TAC 150 7 PHONE JACKS 2PSG 7501 x 11 2PSG 7615 8 PC BOARD KLM 130A x 1 KLM 1265 x 1 6 BLOCK DIAGRAM SCALE WAVE FORM PITCH i t EXT SIG LEVEL WAVE FORM FREO HOLD TIME ATTACK SUSTAIN LEVEL RELEASE TIME EXT TRIG IN O O TRIG OUT voL 510 2 O DUT CONTROL WHEEL OUT N O Signal gt Electric Control 7 ADJUSTMENT PROCEDURE 7 1 Power supply check 1 Positive ripple Should be no more than 2mVp p Set oscilloscope vertical gain at 10mV cm and check that power supply ripple is 2mV or less d Check the tuning of C 1 C 2 and C 3 the WT 10A meter to make sure pitch deviation is with 2 cents for each Change the scale to 32 16 and 4 and check the tuning of all four C keys to make sure 2 Negative ripple that the pitch deviation of each is within 10 cents Same as positive should be no more than 7 3 CV adjustment 2mVp p Use a 4 1 2 digital voltmeter to measure the KBD 7 2 Pitch adjustment CV OUT signal 1 1 a Measure output voltage first when you play Perform adjustment with synthesizer controls at normal setting 8 Waveform Master Tune Pitch and all other knobs at 0 See figure 1 a Play C 3 high on the keyboard and
3. just the high semi fixed screw until you obtain the correct tuning as indicated by WT 10A connected to the SIG OUT jack b Play key 1 and adjust the low semi fixed screw c Repeat steps a and b as many times as necessary until both are tuned to the correct pitch mec East Fig 1 key C 3 then when you play key 2 The output voltage for C 3 should be exactly half that for 0 3 Adjust the CV high O semi fixed screw as necessary so that C 2 produces half the voltage of C 3 b Measure C 2 and then C 1 in the same way Adjust the KBD CV low semi fixed screw as necessary so that C 2 produces exactly half the voltage of 3 Repeat steps a and b as many times as necessary until the output voltage of each of 1 2 and C 3 Is exactly half that of the next Digital voltage meter 7 4 VCF adjustment Connect frequency counter to the Sig out jack 1 VC LPF Reter to the settings shown in figure 2 Set the Fe knob at 5 and the LPF PEAK knob at 10 Then adjust the O semi tixed screw as neces sary so that the LPF oscillation frequency is 500Hz R 3 FREQUENCY COUNTER
4. ISTORS 1 4w 1002 1 1 AW 4030 16 1 4W 4272 16 1 AW 2 94ki2 1 1 4W 4 27k2 1 1 4W S 11K 1 1 44 61 9 0 15 1 4W 100k2 15 1 AW 1 1 DE MYLAR CAPACITORS 50V 0 00t4F 3 50 0 0033 50 0 01 1 50 0 0224 3 xx x TANTALUM CAPACITORS 16V 6 B4F x 1 16V 104F 1 CERAMIC CAPACITORS 25V 0 14F 50 22 50 47 50V 100pF 50V 560pF ELECTROLYTIC CAPACITORS 16V 104F x 1 16V 334F 50V 1 04F 9 1 2 50V 4704F 1 POLYPROPYLENE CAPACITORS 200V 0 224F 1 O POLYSTYRENE CAPACITORS 50 62000 x 1 O POLYESTER CAPACITORS 100 4 1 TRANSISTORS 28 564 5 3 28 6448 1 25 8485000 1 special selected 28C 1583G x 1 250 16855 7 25 30 0 x 1 2SA 30A RG 2 DIODES 18 1555 x 24 18 1865 x 4 LED GD 4 203RD 1 KORG35 1 MC14007 x 1 aPC4558 wATBIS 1 140 1 081 071 2 A7915 x 1 MC140698 x f SEMI FIXED RESISTORS 581905 10 0 2 SR19DS 100kn x 4 ROTARY VARIABLE RESISTORS 802815 EVH 5LA802B 14 EVH 5LABO2ZA 15 EVH SLA802A 16 EVH 5LAB02B16 EVH SLAB02A26 EVC BOSP 18814 RJAP20B14 ROTARY SWITCH SRM 103420P x 2 32 x 1 CONNECTORS BE4P SHF 1 x 7 5 1 BESP SHF t BS3P SHF 1 BS4P SHF 1 Female Connector MS 1002 x 4P MS 1003
5. frequency control input OCT V 3V 3V External pulse width modulation input 5V 5V External signal Input 3VPP max External cut off frequency con wol input 20CT V 5 5V Initial control pul OV 5V External trigger Law Envelope signal reverse out pul 5V Triangle output Rectangle output 1 0 5 5 Pink noise output SVPP White noise output SVPP Control wheel output 5V 0V 5V Signal output 2VPP output impedance 3 5kn max 10 Power 5 Watts Dimension Weight Accessories 499 W x 309 D 249 H mm 6 3kgs Patch cord 35 cm x 1 3 CIRCUIT DIAGRAM BY mm za Ta E Tres i 119 Se a NOVA ue ar 3 n voor WAY 222 KLM 1304 EN gt mol 107 157 a nes nas van lt A ia 7 1 Po a pon me TET 7 RE A we PRE RONAN Wen rien 4 PRINTED CIRCUIT BOARD KLM 126B 5 PARTS LIST Mechanical parts not listed CARBON RESISTORS not listed METAL FILM RES
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