Fisher MT-730 User manual

WY € £
Stereo Turntable
MT-730
MT- 730
134080 20
(Lid Supplied, Black)
134080 21
(Without Lid, Black)
134080 22
(Lid Supplied, Silver)
U.S.

CONTENTS
Arm Feed Cord Stringing ...............c ccc ccc cc cence cen ceeeeeeeeseetussussucussuseucens 2
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Cabinet & Chassis Parts List .......... 0.0... ccc cece cece cece ce neve eeeenseusueeeesecucues 7,8
Turntable Adjustments .............. 0.0 cece cece cece cece cece eee e eee tateetesesueneneunene 9,10
Printed Circuit Board (Bottom View) ..............ccc cece cece sceeeeeesseeenes 11,12,13,14
P.C: Board Parts:list ci csicecesteca ccaiscag ce oobens eck Seaied agen ss be teeieeeeada cee oes 15,16
IC Signal Flow & Equivalent Circuit ............ 00... ccc cece eee eee ee cee see euneuenees 17
Semiconductor Lead Identification .............ccccesceccecseecececeseeceueeuaeeneeees AB
Schematic Diagram :.. 32k dad ds weed weedy sew dee eowiunlepeated sovlceaenegaden eae 19,20
Point to Point Wiring Diagram ............. 0c ccc cece cece cece eee ce eeceeeenesucueueens 21,22
Caution of Usage for Motor ............. ccc cece ccc cece cece cece eee e te etnseeenneneuaenenans 23
Caution of Usage for ICO3 ..... ccc cece cece cee cece ene eeencuenseceeeneueaes 23
ARM FEED CORD STRINGING

SPECIFICATIONS
MT-730
Automatic Functions
Yes
Yes
Yes
Automatic Tonearm Return atEnd ofRecord | Yes
Manual Function
Yes
Stop Yes
Tonearm Data
Resonance <18Hz
130 mm
Straight
Effective Length
Bearing Type
Pivot
0.159
Vertical Pivot
Friction Sensitivity 0.2g -
Max. Tracking Error . +£0.2°
GENERAL
Power Requirements 120 V AC +10 % 50/60 Hz
Power Consumption 10 Watts
Dimensions (W x H x D) 17.33” x 4.5” x 14.5”
Weight (approx.) 10.5 Ibs.
Because its products are subject to continuous improvement, Fisher Corporation reserves the right to modify
product designs and specifications without notice and without incurring any obligation.
Horizontal
Friction Sensitivity

CABINET & CHASSIS EXPLODED VIEW

CABINET & CHASSIS EXPLODED VIEW ccontinuea)
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CABINET & CHASSIS EXPLODED VIEW (continues)
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Ref.
No.
CAI
CAI
CA2
CA2
CA3
CA4
CAS
CA6
CA7
CAB
CAS
CAQ
CAI0
CAI1
CAi2
CAI3
CA13
CAI4
CAI5
CAI6
CAI7
CAI7
CA18
Part No.
PACKAGE
131 6 2519 00201
131 6 3069 17050
131 6 4159 10106
134 2 2104 12300
134 2 4208 15100
141 2 4219 32700
141 6 1139 98300
141 6 1139 98301
141 6 1139 98304
141 6 2519 19490
141 6 3119 23401
141 6 3119 24900
144 6 3119 25000
141 6 3119 25100
144 6 3119 25200
141 6 4559 03300
ACCESSORIES
131 6 2719 10801
131 6 4159 34100
131 6 4319 10802
131 6 4519 14400
131 6 4939 00200
134 2 2901 11601
142 6 4119 32082
CABINET
4 2359 75220
4 2359 76794
4 2359 77145
4 2359 77345
4 2359 77572
131 2 1310 34625
131 2 7103 48800
131 2 7103 26100
131 2 3608 14100
134 6 4739 13403
141 6 4559 03300
141 0.1249 30600
141 0 1249 30601
131 0 2002 16800
131 0 2002 16803
A\ 4 2432 00040
131 2 6111 21300
134 2 6102 15701
141 2 5229 00402
134 2 6302 11500
131 2 4201 20702
141 2 1219 29500
141 2 1219 29501
141 2 1659 35800
131 2 4201 21100
131 0 4004 14403
141 2 1439 14000
141 2 1439 14001
131 2 6113 51000
141 2 1329 14400
141 2 1439 14101
131 2 2904 11000
131 2 2904 11001
131 2 4201 20705
CABINET & CHASSIS PARTS LIST
Description
Bag Polyethylene Ind
Patching Sheet
Notes
Screw Transit(+,-)
Spacer
Screw Transit
Box Corrugate-exp (lid supplied, Black)
Box Corrugate-exp (without lid, Black)
Box Corrugate-exp (lid Supplied, Silver)
Bag Polyethylene-exp
Pad
Pad Front
Pad Rear
Pad (lid supplied, Black/Silver)
Pad PU (without tid, Black)
Serial No. Sheet
Bag Fan
Notes
Service Station List
Warranty Card
Customer Card
Adapter EP
Explanatory Booklet
Connector 12P Assy [CN1]
Connector 3P Assy [CN9]
Connector 1P Assy (Terminal PCB)
Connector 4P Assy [CN2]
Connector 1P Assy (Contro! PCB)
Name Plate
Label
Label
Cramp Wire
Stylus Label
Serial No. Sheet
Lid Assy (lid supplied, Black)
Lid Assy (lid supplied, Silver)
Hinge Assy (lid supplied, Black)
Hinge Assy (lid supplied, Silver)
Power Cord
Bushing
Mat Turntable
Turntable
Beit
Screw, +M3.0x35
Panel Front (Black)
Panel Front (Silver)
Knob
Screw
Wire Shield Assy
Panel Control (Black)
Panel Control (Silver)
Shelter
Filter
Panel Control
Pad Lid (Black)
Pad Lid (Silver)
Screw, Bdg Hd. Tapping
Ref.
Q No.
+
<
CA19
CA20
CA20
CA21
CA22
CA23
CA24
CA25
CA26
CA28
CA29
CA30
CA31
CA32
CA33
CA34
CA36
CA37
CA38
CA39
CA39
CA40
CA4t
CA42
CA43
CA44
CA45
CA46
CA47
CA48
CA49
CASO
CAS1
CA52
CAS3
CA54
CASS
CAS6
CAS7
CAS8
CASS
CA60
CA61
CA62
CA63
CA64
CA65
CA66
CA67
CA68
CA68
CA69
CA70
CA71
CA72
CA73
CA74
CA75
CA75
CA75-1
1
2
CA75-2
CA75-2
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Part No.
131 2 4201 23703
141 2 1129 08800
141 2 1129 08802
131 2 4201 19501
141 0 7519 03900
134 2 4201 13600
134 2 5202 11800
134 2 5205 12000
131 2 4201 20300
141 2 4459 31800
141 2 3719 06200
131 2 4201 25205
AX 4 2512 30500
131 2 3608 12405
141 2 1149 39400
131 2 4201 20801
134 0 5011 02803
AX 4 2312 06051
131 2 4203 84507
131 2 1601 85202
131 2 1601 85200
131 2 4201 25203
131 2 3608 11000
141 2 4419 21100
141 2 1659 35700
141 2 8559 06501
141 2 4459 31700
131 2 5203 23603
134 2 4201 13400
141 2 8559 06506
141 2 1259 07300
141 2 8559 06505
141 0 3129 01900
141 2 4459 33800
141 2 8519 31900
141 2 3519 67400
141 2 8539 53800
131 2 4201 20800
131 2 4201 19500
131 2 4201 19504
141 0 5519 10300
141 2 5649 22600
141 2 8519 60000
134 2 4201 12800
141 2 7519 64000
141 2 5519 52100
141 2 3519 67100
141 2 4459 31800
4 5272 00181
4 2319 76680
4 2319 76680
141 2 3519 66900
141 2 3519 67500
141 2 3519 66800
141 2 4219 06300
134 2 5101 32400
141 2 3519 67000
141 0 6419 01000
141 0 6419 01001
4 1579 27031
4 1579 29451
134 2 1402 12700
141 0 6419 01100
141 0 6419 01101
Description
Screw
Cabinet (Black)
Cabinet (Silver)
Screw, Button Hd. Tapping
Shaft Turntab! Compl.
Screw
Rubber Cushion
Cushion
Screw TP
Cushion
Metal Mount Trans
Screw
Power Trans [T1]
Cramp Wire
Cover
Screw, +M2.6x8
Motor Assy [M1]
Switch Push Power [S4]
Washer Plain, M4.5x10x0.5
Knob Power (Black)
Knob Power (Silver)
Screw, Brazier Hd. Tapping, +M3.0x16
Cramp Wire
Cloth
Knob
Spring Mounting
Cushion(Leg)
Felt
Screw
Spring Mounting
Plate Bottom
Spring Mounting
Unit Plate Assy
Cushion
Spring, Slide Base
Angle Mount(Photo C)
Spring Plate
Screw, +M2.6x6
Screw, Button Hd. Tapping
Screw, Button Hd. Tapping
Worm Assy
Belt
Spring Plate
Screw
Spindle Lifting
Worm Wheel(A)
Angle Mount(Motor)
Cushion
Comutate MTR Magnet (Arm) [M3]
Leaf Switch (Lift Down) [S2]
Leaf Switch (Lift Up) [$3]
Cover(Holder)
Plate(Filter)
LED Holder
Screw
Spring
LED Holder Base
Pick-up Assy (Black)
Pick-up Assy (Silver)
Cartridge(MG-37L)
Stylus(ST-37LD)
Retainer Needle
Tone Arm Assy (Black)
Tone Arm Assy (Silver)
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CABINET & CHASSIS PARTS LIST (continuea)
nef Part No. Description Q’ty
CA76 134 2 5101 26500 Spring
CA77 =141 2 4579 05000 Washer, M3.2x10x0.2
CA78 = 141. 2: 3519 70300 Angie Mount
CA79 =131 2 4112 10200 Rope
CA80 141 2 7319 58000 Holder Slide
CA81 134 2 4106 27000 Shaft
CA82 141 2 5519 52200 Worm Wheil(B)
CA83 141 2 5649 24700 —éBelt
CA84 141 2 5739 07000 Support Shaft
CA85 131 0 3020 11800 Pully Assy
CA86 141 2 3519 69000 Angle Mount
CA87 = 141: 2 «8519 33300 Spring Lock Caset Case
CA88 141 2 3169 23200 Frame
CA89 = 41 2 3519 69100 Angle Mount
CA90 =141 2 4459 33200 Cushion
CA91 = 141: 2: 5289 01600 _—Raail
CA92 141 2 3169 22201 Guide Angle
CA93. «141 2 3519 72200 Angle Mount
CA94 141 2 1259 07400 ‘Plate Bottom
CA95 4 5272 00180 Comutate MTR Magnet (Lifter) [M2]
cx1 101 3 1302 00311 Screw, Pan Hd., +M2.0x3
CX2 = 101 3 1303 03011 Screw, Pan Hd., +M3.0x30
CX3 =: 103 3 1303 00511 Screw, Pan Hd. Tapping-2, +M3.0x5
CX4 103 3 1904 00611 Screw, Brazier Hd. Tapping-2, +M4.0x6
CX5
143 3 1702 00818 Screw, Bind Hd. Tapping-B, +M2.0x8
CX6 =: 112 3: 1302 00011 +E Ring, M2.0
CX7 =. 110 3 2104 00011 Spring Washer-2, M4.0
CX8 =: 106 3 1204 00311 — Hex. Nut-2, M4.0
PCB1 141 0 1939 05390 Control P.C.B. Assy
PCB2 141 0 1939 02710 PCRP.C.B. Assy
PCB3 141 0 1939 02721 PTRP.C.B. Assy
PCB4 141 0 1939 02731 LED P.C.B. Assy
PCB5 141 0 1939 05470 ‘Terminal P.C.B. Assy
PCB6 141 0 1939 05400 Switch LED P.C.B. Assy
PCB7 141 0 1939 05410 Switch P.C.B. Assy
PCB8 141 0 1939 05420 Speed Switch P.C.B. Assy
PCB9 141 0 1939 05430 Volume P.C.B. Assy
PCB10 141 0 1939 05450 Fuse P.C.B. Assy
NOTES:
1. Parts order must contain Model Number, Part Number and
Description.
Seo ow onan pperon ns wer oe eo an a
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oa sa ss
2. Ordering quantity of screws and resistors must be multiple of
10 pcs.
PRODUCT SAFETY NOTICE
Each precaution in this manual should be followed
during servicing. Components identified with the IEC
symbol A\ in the parts list and the schematic diagram
designate components in which safety can be of special
significance. When replacing a component identified
with A\, use only the replacement parts designated, or
parts with the same ratings of resistance, wattage or
voltage that are designated in the parts list in this manual.
Leakage-current or resistance measurements must be
made to determine that exposed parts are acceptably
insulated from the supply circuit before returning the
product to the customer.

TURNTABLE ADJUSTMENTS
Stylus Pressure Adjustment
1.
2.
3.
Place the unit on a horizontal.plane and remove the lid.
Turn on the Power switch of the unit.
Press <| button on the control panel to shift the tonearm to
the place as indicated in Fig. 1.
Turn the stylus pressure adjustment screw as shown in Fig.
2 through the stylus pressure adjustment hole, so that the
stylus pressure meter indicates 1.8 ~ 2.2g.
Adjustment Hole
Fig. 1
Stylus Adjustment Screw
Fig. 2
Tonearm Position Adjustment
1.
2.
3.
Turn on the power switch of the unit.
Remove the lid and the turntable.
Press < button on the control panel to shift the arm to the
place where the tonearm position adjustment cam can be
observed. (Fig. 3)
Adjust the cam, so that the tonearm becomes perpendicular
to the rear wall of the cabinet. (Fig. 3)
=I
Tonearm Position
Adjustment Cam
Fig. 3
Stylus Height Adjustment
1.
Turn on the power switch of the unit.
2. Remove the lid and the turntable.
3. Press <j button on the control panel to shift the arm to the
place where the stylus height adjustment screw can be
observed. (Fig. 4)
4. Adjust the stylus height to 6mm=+0.5mm above the turntable.
Stylus Height
Adjusting Screw Fig.4
Rotation Adjustment
1. Turnon the power switch of the unit.
2. Use the stroboscope sheet and adjust each volume to obtain
proper rotations per minute. (Fig. 5)
Note: In the first instance, perform the adjustment for 33-1/3
r.p.m.
VRO1 for Rotation Adjustment Volume (33-1/3 r.p.m.)
VRO2 for Rotation Adjustment Volume (45 r.p.m.)
Fig. 5
Arm Trace Adjustment
1.
2.
3.
Turn on the power switch of the unit.
Place a record on the turntable and trace the silent groove on
the last portion of the record. ;
If the groove is not traced correctly, cut off R31 (3.3kQ) on
the Control P.C.Board and re-check the tracing. (Fig. 6)
Fig. 6
fal

TURNTABLE ADJUSTMENTS <Ccontinuea)
Photointerrupter Position Adjustment for Arm Feed
1.
2.
3.
Turn on the power switch of the unit.
Place a record with less eccentricity on the turntable and
play it.
After the record has rotated three or four times, raise the arm
by pressing the CUEING button.
Turn the arm feed adjustment screw with a screwdriver
through the hole on the right side of the cabinet, so that the
arm rises straight up. (Fig. 7)
na |
Arm Feed Screw
Fig. 7
Lead-in Position Adjustment
1.
2.
3.
Turn on the power switch of the unit.
Place a record on the turntable and perform the lead-in
operation.
Adjust the lead-in position adjustment cam, so that the
record is led into the correct position.
Note: If the cam is turned clockwise, the tonearm moves
inward. It moves outward if the cam is turned counter-
clockwise. (Fig. 8)
Lead-in Position Adjustment Cam
Fig. 8
End Return Sensitivity Adjustment
1.
2.
3.
Turn on the power switch of the unit.
Connect the oscilloscope to TP . (Fig. 9)
Play a record and adjust VRO1 (100 K-B), so that the peak
value of the DC element becomes 2.6 ~ 2.8V. (Fig. 10)
Confirm that the END Return is smoothly exercised.
PSE ye ic TOE RLS RITE RTE
Fig. 9
2.6~ 2.8V
OV
Fig. 10