Page 1: ...Nakamichi Service Manual Nakamichi High Com II Noise Reduction System...
Page 2: ...r cede 9 3 10 2P Pin dack and VOlMe ecu e cca eee ars ew Ve or wa se NieGes Belson leon 8 Veieieiee a wae a a 9 Adjustments and Measurements 0 0 0 000 cece ce cuees ig ing Ui BohBrissw langww cheat ee...
Page 3: ...Mode Switch 40 3 Filter Switch 1 4 Output Contro 12 5 Inout Level Control 13 6 Master Input Level Control 14 7 GND Jack 15 8 Line Jacks 7 Line In Jacks Rec Out Cal Controls Rec Out Jacks Play In Jacks...
Page 4: ...nic Off MPX or MPX Subsonic with the use of Filter Switch At the further stage it has a compressor or expander com posed of U401B ICs and peripheral circuits that permit aoa Hz Osc Input Level Master...
Page 5: ...Fig 2 3 2 Expander Decoding Fig 2 4 is the basic circuit of the expander _ Compressed signal is fed to V1 and V2 from P1 V2 is similar to V1 and V2 amplifiers of the compressor Level sensar and V2 op...
Page 6: ...on Fig 2 7 indicates the compression characteristics From this chart you can see the changes of compression fevel in accordance with the frequency for instance less compres sion to lower frequency and...
Page 7: ...te the low frequency band near 30 to 40 Hz The subsonic filter used in the High Com II based on the new active filteration technology can realize an ideal filter characteristic Fig 2 9 shows the subso...
Page 8: ...the mute signal is changed from V to 12 V releasing the mute state This means the mute time depends on C402 and R404 after power is ON 2 3 2 Power OFF Transformer output becomes zero as a result of w...
Page 9: ...s y 3 Remove FO8 Meter Band then disassemble FO9 Meter Remove F10 then disassemble F114 Lamp P C B Ass y 4 3 8 Power Switch Refer to Fig 3 2 1 Refer to Fig 3 1 Remove Front Panel Ass y referring to it...
Page 10: ...ide Panel Ass y Refer to Fig 3 1 Remove FO6 and F07 then disassemble FO8 Side Panel Ass y 3 4 Front Panel Ass y and Meter Escutcheon 1 Refer to Fig 3 1 Remove Top Cover Ass y Bottom Cover Ass y and Si...
Page 11: ...4 1 connecting diagram and Fig 4 2 diagram for adjustment High Com IL input Impedance 500Knor more Line In Rec Out t sw Play In Oscilloscope Line Out 10Hz OdB 400H2 0dB 400H2z O48 10dB 60d8 1OKHz 10d...
Page 12: ...202 Eos Low Band off set ere es Band Ret Si RIO3 VR203 oe 8 ial Hi Band off set __ 202 MPX Fig 4 2 Diagram for Adjustment VRIOUYR201 SOK V R102 VRZ202 2M 20 22 iC 10 Fig 4 5 High Com II Low Band RIO4...
Page 13: ...ing on the VTVM Low Band Reference Level Adjustment Set Mode Switch to Play then adjust VR101 VR201 to obtain 600 mV on the VTVM 1 Set Mode Switch to Pass then adjust the external oscillator output le...
Page 14: ...i aoe a 8 cnn aevaanwmensfl zoe an ree aoc me vA aon 4 LPs St O ww r o corplwaichenacnearnepeptyat yo cewty eo es g ee o So tel x ae of 226 i 5 v I Ole tal ee a pole re10 28 Saeco ig 5 2 f Pe erie A...
Page 15: ...trolytic Capacitor 330n 16V OBO5550A Mylar Capacitor 1000P 50V J OBO8680B Heat Sink A 2 pes OE00507A Nut Hex M3 2 pes 0E00612A Screw M3x6 Philips Pan Head 2A 0B05652A Mylar Capacitor 4700P 50V J 2 pes...
Page 16: ...0S 06 07 08 09 10 11 12 L01 LO2 LO3 LO4 LOS JA03635A JA03636A JA03637A JA03638A JA03639A 0J04085C HA03892A HA03893A HA03894A HA03895A HAO03896A HA03897A 0J04090B 0J04091B BA04138A BA04137A BA04141A BA...
Page 17: ...6 2 Synthesis Mechanism Ass y A01 LO2 O1 07 LO5 08 O9 Fig 6 2 16...
Page 18: ...6 3 Rear Panel Ass y B01 Others Fig 6 3 6 4 Meter Ass y B02 7...
Page 19: ...l 2P Pin Jack Volume Holder Volume 50 kQ B Volume 10 kQ B Ground Terminal Switch Cover C Except Others Voltage Selector Lock Plate Others Voltage Seal 100V Japan Voltage Seal 220V 220V Class 2 Voltage...
Page 20: ...t I yes gs 4 ssC eS PR I Play PB Amp Input 8 Mode ct A ___ Filter Switch 1 Subsonic 2 Ott 3 MPX 4 Subsonic MPX Mode Switch a A Cal 400Hz B Record A Cot C Pass Bo Reo 0 Piaybock c Output Fig 7 U401B 1...
Page 21: ...s x13 ane ov RIS 47K s 3 3 R266 z Ci36 1OOOPIJI 8 ez z 8 3 Ri20 56K cial 3 3s 3 C1371 SKIF dloz al E 0 22 35V Cy 0022s Th glx iy ANY e A as Loh S18 LINE 8 INPUT 205 C206 oo kick c150 4p Ov Ourpur Vol...
Page 22: ...0K CHA 33PIN et RISO 47K Pal ANN Ao 88 Fok Fo S R15 47K poeCe ee z z C136 1O00P IW 3 oe 137 ea 98 O oz2uty tt sie Cl4Q 1000P RI49 ISK oo Ww Ao A Ban Boks Boh wl iow cS Rs D 2s D RI7O Mode p Obesa oK C...
Page 23: ...Power Switch Switch AC Input U S A Canada Japan I120V i00V Power i BRN oO VIO YEL Z ojo Sa BLU 6 l Oo a SS Loch Roch Level Meter Note Table of wire colors BLK Black GRY Gray BRN Brown BLU Blue GRN Gr...
Page 24: ...22 Line In Main P C B Ass y Component Side Fig 9 2 10 PERFORMANCE DATA Level dB Level dB 20 5 10 20 10 20 50 400 Frequency KHz Frequency Hz Fig 10 1 MPX Filter Characteristics Fig 10 2 Subsonic Filter...
Page 25: ...k ohms Frequency Response 20 20 000 Hz 1dB Power Source sere rrrreee 100 120 120 220 240 220 or 240 V AC 50 60 Hz according to country of sale Power Consumption 8 W Max Dimensions seer eerrrtee 482 W...
