BQ-II Instruction and Maintenance Manual — Digital Edition · Part 10 · scan pages 109-143
View source PDF ↗Parts Lists and Schematics
Trace the listed factory numbers across MX-5050 models with the service-parts finder →
When ordering parts, the part number must be specified.
Components which do not have part numbers should be specified by a reference number.
Concerning components on the printed circuit boards, those which have part numbers should be specified by their respective part number, and those which do not have part numbers should be specified either by their assembly name or reference numbers.
NOTE
The part numbers in parenthesis are included in the assembly numbers indicated in the "Notes" next to "Part No.", therefore, those parts must be specified by the assembly numbers.
10-1 SAFETY COMPONENTS↑ TOP
For safe operation, components specified by the symbol ⚠, in the circuit diagram, must not be replaced with ones of a different type. These safety components are also listed on Table 10-1.
Table 10-1 Safety Component
| Ref. No. | Description | Part No. | Assembly | Notes |
|---|---|---|---|---|
| 2-9 | Transformer, Power | TF11059 | CHASSIS Ass'y | |
| 2-15 | Fuse, 1A, ⌀5.2 | FH7F010 | " | |
| Fuse, 2A, ⌀5.2 | FH7F020 | " | ||
| Relay, Reel Motor switching | RY1DC029 | " | ||
| Resistor, 18 ohm, 3W | R8DJ180M | " | ||
| 11 ohm, 3W | R8DJ110M | " | ||
| 5.1 ohm, 3W | R8DJ5R1M | " | Control P.C. Board Ass'y (PB-44S) | |
| 100 ohm, 5W | R93-002K | " | ||
| Spark Killer 0.1µF+120 ohm (250 WV) | CZ20001W | " | ||
| Connector, 3P pair, MB | CN403031 | " | ||
| " 3P | CN403075 | " | ||
| " 6P pair, MA and | CN406035 | " | ||
| " 6P MC | CN406077 | " | ||
| 4-7 | Capacitor, Reel Motor, 6.5µF (250 WV) | Reel Ass'y | ||
| P.C. Board, Capacitor | PB-73R | |||
| 6-10 | P.C. Board Ass'y, Power Switch | PB-76C | Control Switch Ass'y | |
| Fuse, Power Supply, 2A | FH7E020 | " | ||
| Spark Killer, 0.033µF+120 ohm (250 WV) | CZ20004W | " | ||
| Spark Killer 0.1µF+120 ohm (250 WV) | CZ20001W | " | ||
| Switch, Push, POWER SPEED REEL | WH12008 | " | ||
| 8-2 | Receptacle, A.C. Inlet, Power | CN603012 | Connector Panel Ass'y | |
| Power Cord | PZ9D003 |
10-2 ASSEMBLY HARDWARE CODING↑ TOP
All screws conform to ISO standard, and have a cross-recessed head, unless otherwise noted.
ISO screws have a point inscribed in the head as in the following figure.
⤢ zoomSide views of a countersunk flat-head screw and a round-head screw, each with its shank diameter D and length L marked, and a cross-recessed screw head with an arrow pointing to the small point inscribed beside the recess.
EXAMPLE OF SCREW
⤢ zoomA diagram of the code "BS3x6N" with arrows labelling each part of the code: type of screw, diameter in mm, length in mm and plating, with a key to the plating: no letter for zinc, N for nickel, B for black zinc and K for black nickel.
EXAMPLE OF WASHER
⤢ zoomA diagram of the code "3SW" with arrows labelling its two parts: diameter in mm and type of washer.
| No. | Code | Full Name |
|---|---|---|
| 1 | BS | Bind SEMS Screw |
| 2 | PS | Pan SEMS Screw |
| 3 | TS | Triple Screw |
| 4 | B | Binding Head Screw |
| 5 | P | Pan Head Screw |
| 6 | F | Flat Countersunk Head Screw |
| 7 | O | Oval Countersunk Head Screw |
| 8 | H | Hex Head Bolt |
| 9 | T | Truss Head Screw |
| No. | Code | Full Name |
|---|---|---|
| 10 | C | Hex Socket Head Screw |
| 11 | S | Hex Socket Headless Set Screw |
| 12 | W | Flat Washer |
| 13 | SW | Spring Washer |
| 14 | N | Hex Nut |
| 15 | LW | Lock Washer |
| 16 | K | Knop Washer |
| 17 | FW | Fiber Washer |
| 18 | FC | Flat Head Socket Cap Screw |
| 19 | BC | Button Head Socket Cap Screw |
10-3 PARTS LISTS AND EXPLODED VIEW↑ TOP
1. HEAD ASSEMBLY↑ TOP
| Ref.No. | Description | Part No. | Notes |
|---|---|---|---|
| 1-1 | Head Housing Ass'y | KH-4Y-A | |
| 1-2 | Stud, Head Housing Ass'y | KH4Y005 | |
| 1-3 | Plate, Head Mount Base | KH0C019 | |
| 1-4 | Bracket, L, P.C. Board | KH4Y002 | |
| 1-5 | Bracket, R, P.C. Board | KH4Y003 | |
| 1-6 | P.C. Board Ass'y, Head | PB-76E | |
| 1-7 | Spring, Head, 6mm | GS2016 | |
| 1-8 | Spring, Head, 8mm | GS2015 | |
| 1-9 | Head, Erase, 4T/2CH | GH4E058A | |
| 1-10 | Head, Record, 4T/4CH | GH4R034D | |
| 1-11 | Head, Reproduce, 4T/4CH | GH4P011E | |
| 1-12 | Plate, Trim, Head Housing Ass'y | KH0F038 | |
| 1-13 | Cover, Front, Head Housing Ass'y | KH0F037 | |
| 1-14 | Guide, Head | KG4C002 | |
| 1-15 | Connector, Head P.C. Board | CN328005 | |
| 1-16 | Bracket, Connector | KH4Y004 | |
| 1-17 | Plate, Shield | KH4Y001A | |
| 1-18 | Washer, Polyslider, ⌀3 × t0.5 | F524-3 |
⤢ zoomAn exploded view of the head assembly: the head housing cover, its mounting screws and washers, the head mounting base plate with the erase, record and reproduce heads and their brackets and springs, the head P.C. board and connector, and the front cover and shield plate, with numbered callouts matching the parts list.
EXPLODED VIEW 1. HEAD ASSEMBLY
2. CHASSIS ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 2-1 | Panel, Trim, Transport | (T506408) | Ass'y T5064-A |
| Escutcheon, Pitch Control | (KC4H005A) | ||
| Escutcheon, Cue | (KR4B006A) | ||
| Escutcheon Ass'y, Timer | (T5064-B) | ||
| 2-2 | Shaft, Tape Guide | KG6E003 | |
| 2-3 | Panel, Trim, Control | T506402 | |
| 2-4 | Panel, Chassis, Transport | T506401 | |
| 2-5 | Clamp, Wire | PZ1G053 | |
| 2-6 | Channel, Reinforce, Chassis | T506405 | |
| 2-7 | Spacer, P.C. Board, LED (B) | (KZ7A823) | Ass'y |
| 2-8 | P.C. Board Ass'y, LED (B) | PB-82T | |
| 2-9 | Transformer, Power | TF11059 | |
| 2-10 | Bracket, C, Ventilate | K102911 | |
| 2-11 | Angle, Chassis, Rear | T506413 | |
| 2-12 | Frame, Chassis, Side | T506106 | |
| 2-13 | Angle, P.C. Board, Control | T506403 | |
| 2-14 | Angle Ass'y, P.C. Board, Control | T5064-C | |
| 2-15 | P.C. Board Ass'y, Control | PB-44S | |
| 2-16 | Angle, Reinforce, P.C. Board | T506406 | |
| 2-17 | Collar, Angle Ass'y, P.C. Board | KZ7A322 | |
| 2-18 | Stud, Angle Ass'y, P.C. Board | KZ7A182 | |
| 2-19 | Washer, Trim, Panel | KZ6C051 | |
| 2-20 | Washer, Vinyl, Panel | KZ6C011 | |
| 2-21 | Washer, Panel, Control | KZ6C009 | |
| 2-22 | Angle, Reinforce, Chassis | T506414 | |
| 2-23 | Felt, Blind, Impedance Roller | PZ1B051 | |
| 2-24 | Felt, Blind, Head Ass'y | PZ1B052 |
⤢ zoomAn exploded view of the chassis assembly: the transport and control trim panels with their escutcheons, the transport chassis panel, the power transformer on its bracket below it, the two cast side frames, the control P.C. board at the bottom with its mounting angles, and the reinforcing angles and channels, with numbered callouts matching the parts list.
EXPLODED VIEW 2. CHASSIS ASSEMBLY
3. CAPSTAN, PINCH ROLLER and SHIFTER ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 3-1 | Cap, Capstan Motor | KC0B011A | |
| 3-2 | Stud, Capstan Motor | KZ7B220 | |
| 3-3 | Plate, Capstan Motor | KC4H001 | |
| 3-4 | Motor, Capstan | MR5A008 | |
| 3-5 | Bracket, R, Capstan P.C. Board | KC4V002 | |
| 3-6 | Bracket, L, Capstan P.C. Board | KC4V001 | |
| 3-7 | Knob, Pitch Control | KN1024A | |
| 3-8 | P.C. Board Ass'y, LED (A) | PB-82S | |
| 3-9 | Felt, Blind, Potentiometer | PZ1B037 | |
| 3-10 | Potentiometer, 500 ohm | RV252009 | |
| 3-11 | Bracket, Potentiometer | KC4H002 | |
| 3-12 | Cap, Pinch Roller | KP0C020 | |
| 3-13 | Washer, Polyslider, ⌀6 × t0.25 | F523-6 | |
| 3-14 | Pinch Roller | KP0A007 | |
| 3-15 | Retaining Ring, E type, ⌀4 | F74TE20 | |
| 3-16 | Shaft, Pinch Roller | KP0B010 | |
| 3-17 | Angle, Spring Hook | KZ3A023 | |
| 3-18 | Retaining Ring, E type, ⌀3 | F74TE15 | |
| 3-19 | Retaining Ring, E type, ⌀2 | F74TE09 | |
| 3-20 | Shaft, Roller Arm | KP4L001 | |
| 3-21 | Spring, Roller Arm | GS1011 | |
| 3-22 | Arm Ass'y, Pinch Roller | KP-4N-A | |
| 3-23 | Solenoid, Pinch Roller | GP1B10 | |
| 3-24 | Pin, Solenoid | KZ5A003 | |
| 3-25 | Rod, Solenoid | KZ6A022 | |
| 3-26 | Spacer, P.C. Board Ass'y, LED (A) | KZ7A823 | |
| 3-27 | Cushion, Solenoid | PZ1C021 | |
| 3-28 | Limit Stop, Solenoid | KZ2A016 | |
| 3-29 | Washer, Spherical, Rod | KP0G004 | |
| 3-30 | Spring, Pressure, Rod | GS2003 | |
| 3-31 | Nuts, M4, Rod | F517-4 | |
| 3-32 | Spring, Shifter Arm B | GS1028-A | |
| 3-33 | Shaft, Shifter Arm | KR4B001 | |
| 3-34 | Arm, Shifter A | KR0B005 |
⤢ zoomAn exploded view of the capstan, pinch roller and shifter assembly: the capstan motor and its mounting plate and cap, the pitch control potentiometer, the pinch roller and its arm, cap and solenoid, the cue arm and its switch and latch, and the shifter arms and springs, with numbered callouts matching the parts list.
EXPLODED VIEW 3. CAPSTAN, PINCH ROLLER and SHIFTER ASSEMBLY
3. CAPSTAN, PINCH ROLLER, and SHIFTER ASSEMBLY
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 3-35 | Arm, Shifter B | KR0B006 | |
| 3-36 | Knob, Cue Arm | KR4F002A | |
| 3-37 | Felt, Blind, Cue Arm | PZ1B001 | |
| 3-38 | Shaft, Cue Arm | KR4B007 | |
| 3-39 | Arm, Cue | KR4C001 | |
| 3-40 | Switch, Micro | WH51029 | |
| 3-41 | Bracket Ass'y, Switch, Cue | KR-4K-A | |
| 3-42 | Spring, Cue Arm | GS1033 | |
| 3-43 | Hook, Cue Arm | KR4C003 | |
| 3-44 | Latch Ass'y, Cue Arm | KR-4C-A | |
| 3-45 | Spring, Shifter Arm | GS1087 | |
| 3-46 | Lug, Spring Hook | CN7D-003 |
⤢ zoomThe same exploded view of the capstan, pinch roller and shifter assembly, repeated here after the continued parts list, with the same numbered callouts as before.
EXPLODED VIEW 3. CAPSTAN, PINCH ROLLER and SHIFTER ASSEMBLY
4. REEL ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 4-1 | Nails, Reel Drive | KW0E038 | |
| 4-2 | Reel Table | KW4J002 | |
| 4-3 | Drum, Reel | KW0B017 | |
| 4-4 | Protector, Reel | KW0H007A | |
| 4-5 | Bracket, Reel Motor | KW0G016 | |
| 4-6 | Motor, Reel | MR1C012 | |
| 4-7 | Capacitor, Reel motor,6.5 µF,250WV | (CZ10023) | Ass'y PB-73R |
| P.C. Board, Capacitor | (PB9A179) | ||
| 4-8 | Bracket, L, Capacitor | KW4B003 | |
| 4-9 | Bracket, R, Capacitor | KW4B004 | |
| 4-10 | Bracket, L, Brake | KW0G013 | |
| 4-11 | Bracket, R, Brake | KW0G012 | |
| 4-12 | Retaining Ring, E Type, ⌀2 | F74TE09 | |
| 4-13 | Arm Ass'y, Brake | KW-4J-A | |
| 4-14 | Spring, Brake | GS1024 | |
| 4-15 | Clamp, Brake | KZ3A047 | |
| 4-16 | Pin, Solenoid, Brake | KZ5A003 | |
| 4-17 | Retainer, Brake | KW4B001 | |
| 4-18 | Drum, Brake | KW0A012 | |
| 4-19 | Solenoid, Brake | GP1F02 | |
| 4-20 | Cushion, Solenoid, Brake | PZ1B049 | |
| 4-21 | Retaining Ring, E Type, ⌀3 | F74TE15 |
⤢ zoomAn exploded view of the reel assembly: the two reel tables with their drive nails and drums and the reel protectors on the transport panel, one reel motor on its bracket, the two reel motor capacitors on their left and right brackets, and the two brakes with their arms, springs, drums and solenoids, with numbered callouts matching the parts list.
EXPLODED VIEW 4. REEL ASSEMBLY
5. TENSION ARM, IMPEDANCE ROLLER, and TIMER ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 5-1 | Cap, Arm | KA0C005 | |
| 5-2 | Arm, Tension | KA0A017A | |
| 5-3 | Shaft, Arm | KA4J001 | |
| 5-4 | Washer, Polyslider, 05 × t0.5 | F524-5 | |
| 5-5 | Holder, Arm | KA0B008 | |
| 5-6 | Guide, Tension Arm | KG4D007 | |
| 5-7 | Nut, Holder | KZ6D004 | |
| 5-8 | Drum, B, Spring Retaining | KA0E005 | |
| 5-9 | Arm, Ass'y, Switch | KA-4K-B | |
| 5-10 | Switch, Micro | WH51027 | |
| 5-11 | Bracket Ass'y, Magnet | KA-4K-A | |
| 5-12 | Spring, Takeup, Tension Arm | GS1048 | |
| 5-13 | Angle, Spring Hook | KZ3A023 | |
| 5-14 | Plate, Spring Hook | KZ3A024 | |
| 5-15 | Drum, A, Spring Retaining | KA0E004 | |
| 5-16 | Angle, Limit Stop | KA0H004 | |
| 5-17 | Spring, Supply Tension Arm | GS1025 | |
| 5-18 | Roller Ass'y, Impedance | KI-4G-A | |
| 5-19 | Washer, Holder | KI0H024 | |
| 5-20 | Nut, Holder | KI0H025 | |
| 5-21 | Holder, Plate | KI0H026 | |
| 5-22 | Plate, Optical Shield | KI4G003 | |
| 5-23 | P.C. Board Ass'y, Direction | PB-82M | |
| 5-24 | Bracket, P.C. Board Ass'y | KI4G002 | |
| 5-25 | Sheet, Insulation | SR5K002 | |
| 5-26 | P.C. Board Ass'y, Timer | PB-82L | |
| 5-27 | Button, Push, Memory | KN2067 | |
| 5-28 | Felt, Blind, Button | PZ1B053 | |
| 5-29 | Bracket, Switch, Memory | SR5K001 | |
| 5-30 | Switch, Push, Memory | WH12097 | |
| 5-31 | Lug, Terminal | CN7D-003 |
⤢ zoomAn exploded view of the tension arm, impedance roller and timer assembly: the supply and take-up tension arms, each with its cap, shaft, holder, spring-retaining drum and spring, the micro switch and magnet bracket on one of them, the impedance roller with its optical shield plate and direction P.C. board, the timer P.C. board with its display and insulation sheet, and the memory pushbutton with its switch and bracket, with numbered callouts matching the parts list.
EXPLODED VIEW 5. TENSION ARM, IMPEDANCE ROLLER, and TIMER ASSEMBLY
6. CONTROL SWITCH ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 6-1 | Button, Push, A PLAY REWIND F.FWD EDIT | KN2069 | |
| 6-2 | Button, Push, B, REC | KN2070 | |
| 6-3 | Button, Push, C, STOP | KN2071 | |
| 6-4 | Protector, R, Button | CB20602 | |
| 6-5 | Plate, R, Switch Base | CB20601 | |
| 6-6 | Switch, Micro | WH11007 | |
| 6-7 | Button, Push, POWER SPEED REEL | KN2072 | |
| 6-8 | Protector, L, Button, | CB20701 | |
| 6-9 | Plate, L, Switch Base | PB41E01 | |
| 6-10 | P.C. Board, Ass'y, Power Switch | PB-76C | |
| 6-11 | Stud, Power Switch P.C. Board | KZ7B106 | |
| 6-12 | P.C. Board Ass'y, Aux. Switch | PB-42F |
⤢ zoomAn exploded view of the control switch assembly: two rows of pushbutton switches and their caps mounted on switch base plates, with the switch P.C. boards and their mounting studs below, and numbered callouts matching the parts list.
EXPLODED VIEW 6. CONTROL SWITCH ASSEMBLY
7. AMPLIFIER ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 7-1 | Knob, LINE | KN1045B | |
| 7-2 | Knob, TEST OSC | KN1045F | |
| 7-3 | Knob, PHONE LEVEL | KN1045D | |
| 7-4 | Knob, MIC | KN1045C | |
| 7-5 | Button, READY/SAFE | KN1060 | |
| 7-6 | Button, MONITOR SELECT | WH0B016B | |
| 7-7 | Button, PHONE | KN1061 | |
| 7-8 | Washer, Knob, Amp. | KZ6C052 | |
| 7-9 | Panel, Trim, Amp. | A104501 | |
| 7-10 | Meter, VU | ME11010 | |
| Lamp, VU meter | (ME11010A) | ||
| 7-11 | Cushion, Meter | A104513 | |
| 7-12 | Panel, Chassis, Amp. | A104502 | |
| 7-13 | P.C. Board Ass'y, MIC ATT. | PB-82R | |
| 7-14 | Jack, MIC EXT-OSC | CN601142 | |
| 7-15 | Jack, PHONES | CN602144 | |
| 7-16 | Potentiometer, Amp., 10 kohm | RV214082 | |
| 7-17 | Switch, Rotary, TEST OSC | WH63039 | |
| 7-18 | Felt, Blind, Button | PZ1B053 | |
| 7-19 | Switch, Push, READY/SAFE | WH12099 | |
| 7-20 | Switch, Push, MONITOR SELECT | WH12098 | |
| 7-21 | Felt, Blind, Slide Switch | PZ1B046 | |
| 7-22 | P.C. Board Ass'y, LED MONITOR SELECT | PB-82Q |
⤢ zoomAn exploded view of the amplifier assembly: the front control panel with its knobs, pushbuttons and VU meters, the P.C. board assemblies for MIC attenuation, LED indicators and REC/REP amplification, the mother board, and the connector jacks and switches, with numbered callouts matching the parts list.
EXPLODED VIEW 7. AMPLIFIER ASSEMBLY
7. AMPLIFIER ASSEMBLY
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 7-23 | Switch, Push, PHONES | WH12100 | |
| 7-24 | P.C. Board Ass'y, Phone Amp. | PB-15A | |
| 7-25 | Panel, Rear, Amp. | A104510 | |
| 7-26 | Limit Stop Ass'y, P.C. Board | A1045-AA | |
| 7-27 | P.C. Board Ass'y, Amp. Control | PB-45E | |
| 7-28 | P.C. Board Ass'y, REC/REP. Amp. | PB-14Z | NAB |
| PB-15I | IEC | ||
| 7-29 | P.C. Board Ass'y, Mother | PB-76D | |
| 7-30 | Washer, Trim, Panel | KZ6C051 | |
| 7-31 | Washer, Vinyl, Panel | KZ6C011 | |
| 7-33 | P.C. Board Ass'y, LED, PEAK | PB-82P | |
| 7-34 | P.C. Board Ass'y, LED, READY | PB-82N | |
| 7-35 | Guide, P.C. Board | CN7B-023 | |
| 7-36 | Bracket, Jack | A104509A |
⤢ zoomThe same exploded view of the amplifier assembly, repeated here after the continued parts list, with the same numbered callouts as before.
EXPLODED VIEW 7. AMPLIFIER ASSEMBLY
8. CONNECTOR PANEL ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 8-1 | Panel, Connector | A104512 | |
| 8-2 | Receptacle, A.C. Inlet, Power | CN603012 | |
| 8-3 | Terminal, Ground | CN901040 | |
| 8-4 | Connector, 3 Socket, XLR Type | CN103046 | |
| 8-5 | Connector, 3 Pin, XLR Type | CN103045 | |
| 8-6 | Connector Ass'y, REMOTE | CN7C-006 |
⤢ zoomAn exploded view of the connector panel assembly: the connector panel with four 3-socket and four 3-pin XLR-type connectors, the AC power inlet, the ground terminal and the remote connector, and a separate rail above it carrying two round feet, with numbered callouts matching the parts list.
EXPLODED VIEW 8. CONNECTOR PANEL ASSEMBLY
9. CASE ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 9-1 | Stand, Support, Tape Deck | K105609 | |
| 9-2 | Foot, Stand | CY4049 | |
| 9-3 | Cover, Rear | (K105604) | Ass'y K105603 |
| 9-4 | Felt, B, Rear Cover | (PZ1B030) | |
| 9-5 | Felt, Blind, Rear Cover | (PZ1B047) | |
| 9-6 | Sponge, Cushion, P.C. Board | (PZ1C050) | |
| 9-7 | Felt, A, Rear Cover | (PZ1B029) | |
| 9-8 | Escutcheon, Ventilation | CY5001A | |
| 9-9 | Bracket, C, Escutcheon | K102911 | |
| 9-10 | Board, Side | (K105602) | Ass'y K105601 |
| 9-11 | Grip, Side Board | (CY1004) | |
| 9-12 | Washer, Trim, Side Board | KZ6C028 | |
| 9-13 | Angle, L, Bottom Cover | K105607 | |
| 9-14 | Angle, R, Bottom Cover | K105608 | |
| 9-15 | Cover, Bottom | K105606 | |
| 9-16 | Foot, Bottom | CY4011-A |
⤢ zoomAn exploded view of the case assembly around the assembled tape deck: the tubular support stand and its feet at the top rear, the rear cover with its felts and cushion sponge, the ventilation escutcheon and its bracket, the two side boards with their recessed grips and trim washers, and the bottom cover with its left and right angles and bottom feet, with numbered callouts matching the parts list.
EXPLODED VIEW 9. CASE ASSEMBLY
10. LOCATION OF RESPECTIVE ASSEMBLY↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 10-1 | Reel Ass'y | KW-4J | |
| 10-2 | Head Ass'y | KH-4Y | |
| 10-3 | Pinch Roller Ass'y | KP-4N | |
| 10-4 | Capstan Ass'y | KC-4V | |
| 10-5 | Tension Arm Ass'y B | KA-4S | |
| 10-6 | Control Switch Ass'y A | CB-234 | |
| 10-7 | Side Board Ass'y | K105601 | |
| 10-8 | Tension Arm Ass'y A | KA-4R | |
| 10-9 | Impedance Roller Ass'y | KI-4G | |
| 10-10 | Tape Timer Ass'y | SR-5K | |
| 10-11 | Control Switch Ass'y B | CB-235 | |
| 10-12 | Record & Reproduce Amplifier Ass'y | A1045 | |
| 10-13 | Foot, Rear | CY4013 | |
| 10-14 | Bottom Cover Ass'y | K105605 |
⤢ zoomA drawing of the assembled tape deck, printed sideways, showing where each major assembly is located, with callouts numbered 1 to 14 for the reel, head, pinch roller, capstan, tension arm, control switch, impedance roller, tape timer and amplifier assemblies and the side board, the amplifier panel drawn tilting out on a curved arrow, and the bottom cover and rear feet drawn exploded below.
EXPLODED VIEW 10. LOCATION OF RESPECTIVE ASSEMBLY
PARTS LIST 11. PACKAGING↑ TOP
| Ref. No. | Description | Part No. | Notes |
|---|---|---|---|
| 11-1 | Plate, TOP | K703126 | |
| 11-2 | Packing, L. Side | K703103 | |
| 11-3 | Packing, R. Side | K703102 | |
| 11-4 | Plate, Manual Hold | K703124 | |
| 11-5 | Accessory, Hold Down Knob | KWOHA | |
| 11-6 | Accessory, Operation and Maintenance Manual | OS3-031 | |
| 11-7 | Accessory, Reel, NAB 10 1/2" | ZA-51A | |
| 11-8 | Plate, Spacing, Reel Box | K703123 | |
| 11-9 | Cover, Tape Recorder | PZ9C003 | |
| 11-10 | Packing, Bottom | K703104 | |
| 11-11 | Case, Packing | K703101 |
⤢ zoomAn exploded view of the packaging: the top plate, the left and right side packings, the manual hold plate with the hold-down knob and the manual, the reel and its spacing plate, the recorder in its cover, the bottom packing and the carton, with numbered callouts matching the parts list.
EXPLODED VIEW 11. PACKAGING
10-4 PIN IDENTIFICATION↑ TOP
The following table shows the pin identification of all diodes, LEDs transistors, and integrated circuits (ICs), used in the circuits of this equipment.
⤢ zoomPinout diagrams for the diodes, LEDs, photo interrupter and 7-segment LED display used in this equipment, showing each device's outline, lead or pin arrangement and anode/cathode or terminal labels.
⤢ zoomPinout diagrams for the transistors and integrated circuits IC-1 through IC-7, showing each device's outline, bottom or top view, and its numbered pins or lettered terminals.
⤢ zoomPinout diagrams for integrated circuits IC-8 through IC-18, including the deck control, direction and timer ICs and various logic gates, showing each device's outline and numbered pins.
⤢ zoomPinout diagrams for integrated circuits IC-19 through IC-27, showing each device's outline and numbered pins.
MX5050 BQ2 TAPE RECORDER
SCHEMATIC DIAGRAMS↑ TOP
TYPE I
| OTARI PART No. | ASSEMBLY NAME | DWG. No. |
|---|---|---|
| PB76E0A | HEAD Connection PCB Ass'y | 4-28961 |
| CB3170A | Tape Transport Wiring Diagram | 3-7695 |
| PB82L0A | Timer PCB Ass'y | 4-28963 |
| PB44S0BA | Control PCB Ass'y | 3-8376 |
| PB82R0A | MIC ATT PCB Ass'y | 4-28965 |
| PB14Z0A | REC REP AMP PCB Ass'y | 3-8497 |
| PB45E0A | AMP Control PCB Ass'y | 3-6649 |
| PB76D0A | Mother PCB Ass'y | 3-6287 |
| PB15A0A | HEAD PHONE PCB Ass'y | 3-6399 |
MX5050 BQ2 12.SEP.1984
⤢ zoomConnection diagram 4-28961 for the head P.C. board assembly PB76E0A: a 28-way connector, its pins tied to the erase heads E1 to E4 through 1 Ω resistors, to the record heads R1 to R4 through 10 Ω resistors, and directly to the playback heads P1 to P4, with a ground bus and a legend rating the 1 Ω resistors at 1/2 W and the 10 Ω at 1/4 W, and an Otari drawing title block reading HEAD PCB Ass'y, CONNECTION DIAGRAM.
⤢ zoomTape transport wiring diagram CB3170A, drawing 3-7695: the power inlet and the power transformer's 100, 117, 220 and 240 V taps and secondary windings; the supply and take-up reel motors with their 5.5 µF capacitors; the REEL, POWER and SPEED switches and the EDIT and MEMORY switches; the brake and pinch roller solenoids; the capstan motor P.C.B. connector and the photo interrupter board PB9A310; the REC, F.FWD, RWD, PLAY, STOP and SAFETY buttons; the pitch control; the voltage regulators IC 4 to IC 9, IC 7 and IC 8 marked MKIII-8 ONLY; the timer P.C.B. with its display, the control P.C.B. (PB-44S), the amplifier and LOCATOR connectors, and the CB102 remote control; with an Otari title block reading CB-317, TAPE TRANSPORT, WIRING DIAGRAM, CB3170A.
⤢ zoomCircuit diagram 4-28963 for the timer P.C.B. assembly PB82L0A: six 7-segment display units, D1 to D6 (PN-0214, common cathode), their segment lines wired in common to connector NA pins 1 to 7 (SEG C, B, A, D, E, G, F) and their digit lines to connector NB (SIGN, 1H, 10M, 1M, 10S, 1S), +5 V fed through R1, 150 Ω (1/4 W), and the RESET switch across GND and RESET, with an Otari title block reading TIMER PCB Ass'y, CIRCUIT DIAGRAM, PB82L0A.
⤢ zoomCircuit diagram 3-8376 for the control P.C.B. assembly PB44S0BA: the transport logic, from the STOP, F.FWD, RWD, PLAY, REC, MEMORY, SAFETY and EDIT key inputs through their gates and flip-flops to the controller ICs IC1 and IC2, the CPU clock and RESET circuit, the speed and capstan switching, the solenoid and reel motor drive with relays RL601 to RL607, the power supply rectifiers and the regulators IC4 to IC9, some marked Applied to MKIII-8 or Applied to MKIII-4, and the capstan servo connections, with a parts table, notes on which circuits are on the board and which are for the model described, a change of value for R46 by model, and an Otari title block reading CONTROL P.C.B. Ass'y, PB44S0BA.
⤢ zoomCircuit diagram 4-28965 for the MIC ATT P.C.B. assembly PB82R0A: four identical channels, CH1 to CH4 MIC SIG, each taking its signal in at AV1, AV3, AV5 or AV7 and out at AW1, AW3, AW5 or AW7, with a 3.9 kΩ and 470 Ω divider (R801 to R808) and a switch, SW801 to SW804, choosing the direct or the divided signal, and the return lines AV2, AV4, AV6 and AV8 run straight through to AW2, AW4, AW6 and AW8; a note reads SW801~4: MIC Attenuator SW, 0 dB or −20 dB; with an Otari title block reading PB82R, MIC ATT PcB Assy, CIRCUIT DIAGRAM, PB82R0A.
⤢ zoomCircuit diagram 3-8497 for the REC/REP AMP P.C.B. assembly PB14Z0A: the reproduce head preamplifier, the record amplifier with its line, mic and test oscillator inputs, the bias and erase head drive, the line, headphone and VU meter outputs, and the record/reproduce switching logic, with a parts table of its ICs, transistors and diodes, a table of the potentiometer and switch functions, an equalization table of component values for NAB and IEC at high and low speed, the note THIS SCHEMATIC DIAGRAM IS APPLIED TO PB-14ZA, PB-14ZAA, and an Otari title block reading PB-14Z, REC/REP AMP PCB Ass'y, CIRCUIT DIAGRAM, PB14Z0A.
⤢ zoomCircuit diagram 3-6649 for the AMP control P.C.B. assembly PB45E0A: the shift register and gates that take the mechanism and CH1 to CH4 REC COMM. lines to the CH1 to CH4 REC indicator drivers, the 1 kHz and 10 kHz test oscillators and the external oscillator input switched to TEST OSC, the EQ switching transistors, and the power-on mute circuits A and B, with a parts table, the function of potentiometer VR501 (10 kHz TEST OSC level), and an Otari title block reading PB-45E, AMP CONTROL PCB Ass'y, CIRCUIT DIAGRAM, PB45E0A.
⤢ zoomCircuit diagram 3-6287 for the mother P.C.B. assembly PB76D0A: the board the four channels' amplifier cards plug into, drawn as four matching sections, CH1 to CH4, each with its card connectors, its bias output transformer and its record, reproduce and erase head connections; the headphone level control and outputs (AT1 to AT5); and the ±15 V and ground distribution, with an Otari title block reading PB-76D, MOTHER PCB Ass'y, CIRCUIT DIAGRAM, PB76D0A.
⤢ zoomCircuit diagram 3-6399 for the headphone amp P.C.B. assembly PB15A0A: the four channel signals, CH1 to CH4 at AU-1 to AU-4, each through a 20 kΩ resistor (R701 to R704) and a monitor switch (SW701 to SW704) to a common bus, the headphone level control VR701 (10 kΩ) between AT-1 and AT-3 with its wiper at AT-2, and the two halves of IC701 driving AT-5 and AT-4 through 150 Ω, 1/2 W resistors, with the ±15 V supply at AV-1 to AV-3, tables of the IC, the switch functions and the potentiometer function, and an Otari title block reading PB-15A, HEADPHONE AMP PCB Ass'y, CIRCUIT DIAGRAM, PB15A0A.