McIntosh MX121 Service Manual
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McIntosh MX121 Service Manual

McIntosh MX121 Service Manual

A/v control center
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Performance Specifications ..........................................2
Notes ...........................................................................2
Rear Panel ...................................................................3
Section Location ..........................................................4
Block Diagram .......................................................5 - 6
Interconnection Diagram ........................................7 - 8
Display/Keyboard Schematic and PCB ..................9 - 14
Video Schematic and PCB ..................................15 - 22
SERVICE MANUAL
MX121
A/V CONTROL CENTER
SERIAL NO. ABG1001 And Above
CONTENTS
ACX1001 And Above
Audio Schematic and PCB ..................................23 - 36
Balanced Schematic and PCB .............................37 - 40
Plane Schematic and PCB ...................................41 - 46
Remote Schematic and PCB ...............................47 - 50
Power Supply Schematic and PCB ......................51 - 54
Backup Power Supply Schematic and PCB..........55 - 58
HDMI PCB .........................................................59 - 60
Parts List .............................................................61 - 75
Repacking Instruction ................................................77
MX121

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  • Page 1: Table Of Contents

    MX121 MX121 A/V CONTROL CENTER SERIAL NO. ABG1001 And Above ACX1001 And Above CONTENTS Performance Specifications ..........2 Audio Schematic and PCB ........23 - 36 Notes ................2 Balanced Schematic and PCB ......37 - 40 Rear Panel ..............3 Plane Schematic and PCB ........41 - 46 Section Location ............4...

  • Page 2: Performance Specifications

    47k Ohms, 65pf 240 Volts, 50/60Hz at 75 watts High Level: 20k Ohms Unbalanced and Balanced Standby, less than 0.5 watt Note: Refer to the rear panel of the MX121 for the correct voltage. Sensitivity for Rated Output Phono: 4.5mV Overall Dimensions...

  • Page 3: Rear Panel

    MX121 REAR PANEL...

  • Page 4: Section Location

    SECTION LOCATION...

  • Page 5: Block Diagram

    MX121 BLOCK DIAGRAM...
  • Page 6 INTERCONNECT...
  • Page 7 MX121 DISPLAY/KEYBOARD 751294 SCH 1 OF 2 KEYBOARD J1 1:1 8 J1 0:1 SUR.MODE KEY_SURR J1 1:1 7 J1 0:2 KEY_AUTO AUTO NAV KEYS J1 0:3 J1 1:1 6 KEY_PURE PURE DIRECT J1 2:1 K E Y GND K E Y GND...
  • Page 8 DISPLAY 751294 SCH 2 OF 2 J1 4:2 FP5V USB+ KNOB KNOB LOGO BUTTON BUTTON SWM3.3V J1 4:1 USB- USB- LIGHTING CONTROL FP5V J1 4:3 USB+ DS 7 DS 8 DS 16 DS 24 DS 26 I2C DA J1 4:5 CASE I2C CL FP5V...
  • Page 9 MX121 DISPLAY 751294 PCB...
  • Page 10 VIDEO 751295 SCH 1 OF 3 TO S/CVBS VGND V-5V V+5V 10µF J10:5 BD - Y IN1Y 10µF J10:6 DVD - Y IN2Y 10µF J10:3 BD - CB IN1CB 10µF J10:4 DVD - CB IN2CB 10µF 1.21K J10:1 BD - CR IN1CR J12:5 Z2 - Y...
  • Page 11 MX121 VIDEO 751295 SCH 2 OF 3 TO S/CVBS VGND V-5V V+5V 10µF J10:5 BD - Y IN1Y 10µF J10:6 DVD - Y IN2Y 10µF J10:3 BD - CB IN1CB 10µF J10:4 DVD - CB IN2CB 10µF 1.21K J10:1 BD - CR...
  • Page 12 VIDEO 751295 SCH 3 OF 3 OPT1 SWM3.3V F_OPT OPT IN 3 D/MGND A+8V A-8V R1 08 MICDET MICGND J1 3 CALIBRATION MICROPHONE C8 1 R1 01 1µF D/MGND J1 4 SETUP MIC 1µF SWM3.3V U8 :2 F_OPT MICDET R9 9 18.2K 100pF MICGND...
  • Page 13 MX121 VIDEO 751295 PCB...
  • Page 14 AUDIO 751296 SCH 1 OF 6 Front Plane Relay control from Digital PCB Stereo Inputs to Digital PCB 8-Chan Audio from Digital PCB 8-Chan PreAmp Outputs to Bal PCB +12V_ANA -12V_ANA 10µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF...
  • Page 15 MX121 AUDIO 751296 SCH 2 OF 6 22µF RLY_FH FH MUTE 330pF 100K 100K FRONT HEIGHT LEFT J9:2 FRONT HEIGHT RIGHT 100K 100K 330pF 22µF 22µF RLY_FW FW MUTE 330pF 100K 100K FRONT WIDTH LEFT J9:1 FRONT WIDTH RIGHT 330pF...
  • Page 16 AUDIO 751296 SCH 3 OF 6 TUNERL R271 C220 R273 330pF 681K J6:3 TUNER C221 R274 MM Phono Preamp 330pF 681K 10µF R272 47.5 PHONO_L TUNERR BD_L 1.1k 10µF 100pF 7.5k 95.3k 330pF 681K 470µF C222 J6:2 47pF 47.5k 475K .1µF .1µF 95.3...
  • Page 17 MX121 AUDIO 751296 SCH 4 OF 6 + 6.5dB AMP -12V_ANA 22µF R115 R116 10µF Input[1A] FL-PREOUT .1UF Input[1A] VCR_REC_L 22µF U1:1 R117 R118 RLY_F H-W-Out[1A], RCA-Out[1A] 22.1K 22µF R119 R121 R122 R123 R124 8.25k 475K 100K 100pF 100K 100K 330pF .1UF...
  • Page 18 AUDIO 751296 SCH 5 OF 6 +12V_RELAY RLY_FB-CTL +12V_RELAY RLY_F-CTL 10mA Relay Coil RLY_F RLY_FH-CTL RLY_FB_FH +12V_RELAY RLY_C_SW-CTL RLY_C_SW +12V_RELAY +12V_RELAY RLY_S-CTL RLY_Z2-CTL RLY_S RLY_Z2 +12V_RELAY RLY_SB-CTL +12V_RELAY RLY_Z3-CTL RLY_SB RLY_Z3 +12V_RELAY RLY_FB-CTL R267 RLY_FB +12V_RELAY RLY_FH-CTL RLY_FH +12V_RELAY RLY_FW-CTL RLY_FW...
  • Page 19 MX121 AUDIO 751296 SCH 6 OF 6 To Connector Sheet C163 C164 C165 .01µF .01µF C166 10µF R203 R204 R205 10µF C168 47pF C167 100pF 40.2k 4.75K 47.5 R206 C170 C169 R207 10µF R208 R209 4.75K ZONE2_L U5:1 R210 .0033µF C171 22µF...
  • Page 20 AUDIO 751296 PCB...
  • Page 21 MX121 BALANCED 751297 SCH 47µF LEFT BALANCED TO UNBALANCED + BALANCED AMP -12V_ANA 10µF - BALANCED AMP 10µF LEFT + RLY_F 10µF .1UF 47µF 47µF U9:2 100pF AUX1 L-IN U1:1 U1:2 10µF FRONT LEFT LEFT - 47µF 220pF 220pF 100K...
  • Page 22 BALANCED 751297 PCB...
  • Page 23 MX121 BACKPLANE 751298 SCH 1 OF 2 TO DISPLAY PCB TO DIGITAL HDMI PCB H/PDET VIDEO PCB DIGITAL HDMI PCB DIGITAL HDMI PCB J1 0 J1 1 J1 2 A VIDEO PCB J1 4 J1 3 AUDIO PCB J1 6...
  • Page 24 BACKPLANE 751298 SCH 2 OF 2 RS232 POWER CONTROL PCB DIGITAL HDMI PCB CP 3 CP 2 VIDEO PCB CP 4 CP 5 AUDIO PCB BALANCED CP 9 AUDIO PCB...
  • Page 25 MX121 BACKPLANE 751298 PCB...
  • Page 26 REMOTE 751299 SCH Data Idle 132348 Idle DATA-IN Data Data M3.3V M3.3V Idle Idle Data RC_OUT D/MGND D/MGND D/MGND FRONT IRIN Data Data Idle Idle 132346 Idle Idle WAKEUP Data WAKEUP Data Kill KILLIR KILLIR RC_OUT M3.3V FRONT IRIN J3:1 RC_IN RC_IN Idle...
  • Page 27 MX121 REMOTE 751299 PCB...
  • Page 28 POWER SUPPLY 751300 SCH +16V_UNREG IN OUT +12V_ANA +12V_ANA J3:1 J3:14 .1uF 100uF J3:2 J3:13 J3:3 J3:12 -12V_ANA J3:4 J3:11 J1:1 -16V_UNREG IN OUT -12V_ANA J3:5 J3:10 1.85A +12V_RELAY J3:6 J3:9 J3:7 J3:8 J1:2 +16V_RLY_UNREG IN OUT +12V_RELAY SEC 1 .1uF 100uF 1000µF...
  • Page 29 MX121 POWER SUPPLY 751300 PCB...
  • Page 30 BACKUP POWER SUPPLY 751494 SCH 100-120V 50/60Hz 089123 T2AL 250V 220-240V 50/60Hz 089129 T1.6AL 250V 118033 D101 F100 3-AMP AC LINE FILTER T° Line Hot US/JP ONLY J2:1 D100 5 ohm C131 ZD101 R101 ZD100 ZE 39V500MW 2.21M C102 C100 C101 3300pF 100µF...
  • Page 31 MX121 BACKUP POWER SUPPLY 751494 PCB...

  • Page 32: Hdmi Pcb

    HDMI PCB 751344 PCB...

  • Page 33: Parts List

    DS14 LED WHITE SMD 058193 CA12 CABLE FFC12 CONDUCTOR 70MMD 171318 DS15 LED RED 5MM ROUND 058187 CONTACT MCINTOSH SERVICE DEPT. AC RECEPTACLE W/LINE FILTER 3A 118033 (DS15) LED SPACER .220 LENGTH 017642 DS16 LED GREEN 5MM 30 DEG 058190...
  • Page 34 PARTS LIST (Cont’d.) DISPLAY PCB 751294 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 100 1/8W 1% 145005 CONN 12 PIN FFC RA SMT 117990 RES SMD0805 22.1 1/8W 1% 145003 CONN 12 PIN FFC 117907 RES SMD0805 22.1 1/8W 1% 145003...
  • Page 35 CAP ELECT 47UF 50V SMD 066604 CRYSTAL 18.432000MHZ 20PF SMD 180065 CAP MONO .1UF 50V ±20% X7R SMD 061365 FIRMWARE DISPLAY V1.00 MX121 230021 CAP 1206 10UF 10% 6.3V XSR SMD 061389 SCR TS 2-32 X 5/16 PH PN BLK 401118 CAP 1206 10UF 10% 6.3V XSR SMD...
  • Page 36 PARTS LIST (Cont’d.) VIDEO PCB 751295 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. DIODE ZENER 5.1V 5% 070215 CAP 1206 10UF 10% 6.3V XSR SMD 061389 CAP 1206 10UF 10% 6.3V XSR SMD 061389 DIODE ZENER 5.1V 5% 070215 CAP 1206 10UF 10% 6.3V XSR SMD 061389...
  • Page 37 MX121 PARTS LIST (Cont’d.) VIDEO PCB 751295 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 4.75K 1/8W 1% 145008 RES SMD0805 2.21K 1/8W 1% 145024 RES SMD0805 10 1/8W 1% 145017 RES SMD0805 2.21K 1/8W 1%...
  • Page 38 PARTS LIST (Cont’d.) AUDIO PCB 751296 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP MPF 0.033UF 5% 63VDC 064318 C104 CAP MONO .1UF 50V ±20% X7R SMD 061365 CAP MPF 0.01UF 5% 63VDC 064312 C105 CAP ELECT 22UF 35V SMD 066603 CAP MONO .1UF 50V ±20% X7R SMD 061365...
  • Page 39 MX121 PARTS LIST (Cont’d.) AUDIO PCB 751296 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. DIODE ESD SUPPRESSOR SMD 070198 C180 CAP MPF 0.0033UF 5% 63VDC 064455 DIODE ESD SUPPRESSOR SMD 070198 C181 CAP ELECT 10UF 50V SMD...
  • Page 40 PARTS LIST (Cont’d.) AUDIO PCB 751296 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RELAY DPDT SIGNAL 12VDC SMD 087084 RES MF 221 OHM 1% 1/4W 144559 RELAY DPDT SIGNAL 12VDC SMD 087084 RES SMD0805 10 1/8W 1% 145017 RELAY DPDT SIGNAL 12VDC SMD 087084...
  • Page 41 MX121 PARTS LIST (Cont’d.) AUDIO PCB 751296 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. R102 RES MF 475 OHM 1% 1/4W 144509 R162 RES SMD0805 100K 1/8W 1% 145014 R103 RES MF 475 OHM 1% 1/4W...
  • Page 42 PARTS LIST (Cont’d.) AUDIO PCB 751296 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. IC DUAL OP AMP 5532 SMD 133718 R221 RES SMD0805 100K 1/8W 1% 145014 IC VOLUME/TONE CONTROL SMD 133726 R222 RES SMD0805 100K 1/8W 1% 145014 IC DUAL OP AMP 5532 SMD 133718...
  • Page 43 MX121 PARTS LIST (Cont’d.) BALANCED PCB 751297 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. CAP MONO .1UF 50V ±20% X7R SMD 061365 DIODE SMALL SIGNAL 4148 SMD 070199 CAP 220PF 200V 10% NPO SMD0805 061369 DIODE ESD SUPPRESSOR SMD...
  • Page 44 PARTS LIST (Cont’d.) BALANCED PCB 751297 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. RES SMD0805 100K 1/8W 1% 145014 RES SMD0805 10 1/8W 1% 145017 RES SMD0805 100K 1/8W 1% 145014 RES MF 4.99K 1% 1/4W 144521 RES MF 4.99K 1% 1/4W 144521...
  • Page 45 MX121 PARTS LIST (Cont’d.) BALANCED PCB 751297 (Cont’d.) REMOTE PCB 751299 Ref. No. Description Part No. Ref. No. Description Part No. IC DUAL OP AMP 5532 SMD 133718 DIODE SMALL SIGNAL 4148 SMD 070199 IC DUAL OP AMP 5532 SMD...
  • Page 46 PARTS LIST (Cont’d.) POWER SUPPLY PCB Ref. No. Description Part No. Ref. No. Description Part No. CAP ELECT 100UF 25V 066573 CONN PCB MOUNT POWER RED 117719 CAP MONO .1UF 50V 20% Z5U 061346 TERMINAL STRIP 14 PIN .025 SQ 117647 CAP ELECT 4700UF 35V 066541...
  • Page 47 MX121 PARTS LIST (Cont’d.) BACKUP POWER SUPPLY PCB 751301 (Cont’d.) Ref. No. Description Part No. Ref. No. Description Part No. D101 DIODE RECTIFIER 1N4007 070178 R120 RES SMD0805 47.5 1/8W 1% 145004 D102 DIODE RECTIFIER 1N4007 070178 R121 RES SMD0805 15K 1/8W 1%...
  • Page 48 NOTES...

  • Page 49: Repacking Instruction

    If a shipping carton or any of the interior part(s) are needed, please call or write Customer 034499 Accessory Box 034486 Slotted foam Service Department of McIntosh Laboratory. Refer 034487 Divider foam to page 3. Please see the Part List for the correct part numbers. MICROPHONE...
  • Page 50 The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated, who reserve the right to improve design without notice. Because of the constant upgrading of McIntosh products’ circuitry and components, the Company cannot insure, and does not warrant, the accuracy of the within schematic material, which is intended for information only.

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