Sansui SD 7000 Service Manual

Page 1

SANSUI ELECTRIC COMPANY LIMITED

Page 2

-.-.-....--.u-.LM..~.

TABLE OF CONTENTS

Section L119 Page
1. SPECIFICATIONS ................................ 1-1
2. CONTROLS INDICATORS AND

OTHERS ..................................... 2-1
2-1. Upper Front (1) .............................. 2-1
2-2. Lower Front (2) .............................. 2-8
2-3. Side Panel ...... . .......................... 2-5
2-4. Rear Panel ................................. 2-6
3. 4-TRACK RECORDING AND ~
PLAYBACK.......................... ........... 3-1
' 3-1. Tracking Pattern .............................. 3-1
3-2. Tracking Number ............................. 3-1
3-3. 4-Track 2-Channel Stereophonic
Recording ................................ 3-1
3-4. Monophonic Recording In
4-Track Pattern .............................. 8-2
3-5. 4-1raek 2-Channei Stereophonic
Playback .................................. 3-2
3-6. 4-1rack Monophonic Playback ...................... 3-2
4. OPERATION OF RELAYS ........................... 4-]
4-1. Forward Operation ............................ 4-1
4-2. Reverse Operation ............................ 4-1
4-3. Fast Forward Operation ................. . . ........ 4-1
4-4. Rewind Operation ............................. 4-2
4-5. Automatic Rewind, Contact 1 of
Automatic Switch 3715 .......................... 4-2
4-6. Automatic Reverse, Contact 2 of
Automatic Switch 5715 .......................... 4-2
4-7. Automatic Repeat. Contact 3 of
Automatic Switch 8715 ............. . . . . . ....... 4-2
4-8. Record Button Operation .................. _ ....... 4-3
4-9. Speed Switching Operation ........................ 4-3
4-10. Stop Button Operation . . . , ...................... 4-3
6. ELECTRICAL ADJUSTMENT ......................... 5-1
5-1. VU Meter Adjustment ........................... 5-1
5-2. 100 kHz Filter Adjustment ........................ . 5-1
5-3. Bias Current Adjustment ......................... . 5-1
5-4. Recording Sensitivity
Adjustment ................................ 5-1
5-5. 20 Hz Frequency Adjustment . ...................... 5-1
5-6. Sensitivity Adjustment in
Automatic Tape Transport

Circuit ........... . . ..................... . 5-1

Page 49

hulk

Ill-5. Pinch Roller Replacement
(See Fig. 10.9)

The pinch roller, being forced against the
capstan and acting as a torque transmitter. greatly
affects wow and flutter. Therefore, a worn out pinch
roller or an oillcss metal needs to be replaced. These
parts can be replaced separately, but replacement of
the pinch roller ammbly is recommended. Proceed
as follows: Remove the two 8 type screws {23 , ®
and the two P type washers ® . 69 from the front
panel. Remove, then, the pinch roller housing (20 and
pull off the pinch roller assembly 69 from the front
panel. Assemble the pinch roller and other necessary
parts using the reverse or the disassembly procedure.

.g 1 m .m»-- . . :.~
., MKMW-lww.. .m-,...~-.- . TVs-.7 . ,.

ill-6. Reel Motor Replacement

Replace the reel motors when found defective
or after 30,000 hours of normal operation.

1. Disassembly (SeeFigs. 10-10. 10-11, 10-12)

1) Remove the two reel tables {3) , @p by
removing the two table sheets Q9 , Q) and the

sithypescreWS ® 0 @ s®t®l®l
a; . SeeFig. 10.10.

2) To pull off the 20 Hz sensing amplifier hoard.
G-1039A® from the 15 pin connector, remove
the two B type screws 6) , Q), the two P type
washers ® . © and the two rubber bushings
@ , © . See Fig. 10-11.

3) Remove the reel platform assembly ® by
removing the six B type screws . ® , ® ,
® , ® , ® and the six S type washers
©.®.®.®.®.®.

4) Remove the two brake drums (3) , © by
removing the four 8 type screws (9 . Q) l G) .
6). See Fig.10-12.

5) Remove the bracket assembly 0 by removing
thesletypescrews 0 , o, 0, 0 . O .
0 , thesixStypewashers 0,0. 0, 0 .
0 , 0 and the six Ptype washers 0 ,0,
o. 0 , 0 , o . See Fig. 10-12.

6) Remove the two real motors 65> , ® , by
removing the witht B type screws {(1) , 63 ,
€30 .@.®.@' 029. ®,thewight

Stypewsshers®.@.®v®o@.
@D' . ® . {it and the eight reel motor

table shear

105

Page 102

1".2 ' .

__/

80-7000 Salunu'.

12-1. 015111550111ny 0f the Mechanical Section")

To disassemble the mechanical Section (1), see

Fig. 12-14, Mechanical Section. Rear (1).

Notes: tIhe numerals in the exploded views

and parts list show the sequence of
disassembiy. Therefore, assemble the
set if necessary, using the reverse 0!
the individual procedures.

Peru No.

Stock No. Dena-1911011

IcApply the locking paint In place to all
the screws after tightening them com-

pletely.

*Wipe off any used lubricants after
every disassembly. Apply. then. disul-
fide molybdenum or Mobile Grease
Special in place.

P01131110. Stock No.

Deviation

cmummamw-

64:583281328883882883888330088

5101053 Btype Screw. M41110
5121M StypeWaaher.4x1.4x1.0
5120161 P type Washer. 4 11 10 x 0.8
5101063 BtypoScrew.M4x 10
5121300 StypeWasher.4x1.4x1.0
5120161 P type Washer. 4 11 10 x 0.8
5101063 B type Screw. M4 at 10
5121360 StypaWasher,dx 1.41110
5120161 theWasherAx 10:10.8
6610020 Bracket. motor mtg.
5101063 8 type Screw,M4 z 10
5121360 StypeWashor,411 1.4: 1.0
5101063 B type Screw, M4 11 10
5121350 8 type Washer. 4 it 1.4 x 1.0
5101063 Btypo Screw,de 10
5121360 5 type Waite-v.4 x 1.4 x 1.0
5101063 B type Scraw,M-1 1t 10
5121360 5 type Washer, 4 x 1.4 x 1.0
4320020 Caxton Motor

6030010 Belt, capstan

5106060 Stype Screw,M4x4
5106060 Stypa Sam,M4114
0140010 Pullev. motor

5102664 F tyne Screw, M4 11 12
5102864 F type Saew. M4 at 12
5102664 F type Sam. M4 at 12
5102804 FtypcSaedex 12
5102664 FtypoSaew.M4x 12
6630010 Tab(0,cap013n motor mtg.
5106060 Stype Screw,M4x4
5106060 S type Saew. M4 :1 4
6100010 Capsten Wheel

5110261 H011. 11111.4 x 7 x 3.2
5121360 StypeWoahor.4x 1.41110
5102865 F type Saew. M4 :1 15
5110261 Hot. Nut, M4 11 7 x 3.2
5121360 StypeWamerAx 1.0x1._0
5102655 F type Screw. M4 11 15
5110261 Hex. Nut,M4 x 7 x 3.2
5121360 5 typo Washer. 4 111.4 x 1.0
5102865 F typo Screw. M4 )1. 15
6300010 M0131 Cm

5152016 C type R100. 235 0
6320010 Ball Bearing

6300000 Olllen Metal

6930010 Oil Retainer

6200010 Shaft. capstan

5101043 6 type Sam. M3 at 6
5121340 StvpoWasheer 1.1110]

883818128898

838828898883883809833

5101043
5121340
5240230
5101041
5121340
5101041
5121340
1130230
5101043
5121340
52001)
5101043
5121340
5101043
5121340
5102043
5102043
5220020
5430010
5102054
5230020
5102004
5230020
5102064
5230020
5102064
5230020
5102954
5230020
5102054
5230020
5101043
5121340
2110000

6101043
5121340
5120141
5101043
5121340
5120101

1102180
5240240
3910040
5101053
5121340
5220060

B type Screw. M3 1: 6
Stype Washer. 3x1.1x 0.7
Platter-11.03040 switch mtg.
B type Screw. M3 11 4

S typo Washer. 3 x1.1x 0.7
B type Screw, M3 :1 4
StypeWasth, 3 x 1.111 0.7
Pushbutton Switch. LA type
B type Screw, M3 :1 6
StypeWasher, 3 x1.1x 0.7
Enforcement. counter

8 W08 Screw, M3 11 6

S typeWasher, 3 111.11: 0.7
6 type Screw, M3 )1 6

5 type wwms 111.111 0.7
F type Saew. M3 11 6

F typo 500w. M3 11 6
Fame. counter mtp.
Counter

F typo Screw. M4 :1 12

Hex. Spacer 1L . 18 mm)

F typo Screw. M4 at 12
Hex. Spacer, (L I 18 mm)

F typo Screw. M4 11 12
Hex. $00001. (L - 18 mm)

F typo Screw. M4 )1 12

Hex. Spacer. (L -18 mm)

F typo Screw. M41 11 12
Hex. Spacer. (L - 16 run-11

F typo Screw. M4 )1 12

Hex. Spacer. (L - 18 mm)
B type Screw, M3 2: 6
Stychashor. 3 111.111 0.7
2-Lug Terminal Strip
Autormtic Switch Ass'v.

B type Screw. M3 11 6

S type Washer, 3 111.11: 0.7
P type Washer. 3 x 8 a1 0.5
6 type Screw. M3 71 6
StypeWahev,3x1.1 11 0.7
P type Washer. 3 x 8 x 0.5
Hex. Nut. M7

P type Washer. 7 0

Rotary Switch. 1123-4
Bracket. automatlc switch
Lead Clampar

B type Screw, M3 11 6

S typeWosher. 3 x 1.111 0.7
Fram. lead wire holdp

1 2-31