Dual 1216, Service Manual

Page 1: ... platter 3 2 lbs Rumble 35 dB below signal level in accordance to DIN 45 500 Weighted rumble 55 dB below signal levet in accordance to DIN 45 500 Tonearm torsionally rigid aluminium tubular tonearm with vertical needle bearings horizontal 2 layer precision ball bearings in hardened and polished races Maximum tracking error 0 180 cm Tonearm bearing frictions referred to stylus tip vertical less tha...

Page 2: ...tch 1 n L 171 2 channel 1 red lead contact plate at plug in head plug in head with cartridge green mu metal housing of cartridge phonograph record inner side of groove left channel 7 channel 1 red Q2 tonearm circuit 1 r r r 1 channel 2 white 1 channel 2 white lead b with phono plug red yellow c with banana plugs channel 1 red channel 2 yellow common black ground green plug in head spring contacts ...

Page 3: ...e is started 9 Tonearm lowers too quickly when drop cycle is started 9 Tonearm returns to rest immediately after being placed on record manually 9 Start cycle 9 Manual start 10 Stop switching 10 Muting switch 11 Record drop 11 Shut off and change cycle 11 Shut off mechanism 12 Turntable stops after automatic setdown of the tonearm 12 Last record keeps repeating 12 Record does not drop when unit is...

Page 4: ...eplaced or exchanged it must be set at the co rect height see Fig 5 Fig 3 Motor field connections lass voltage selector 104 The turntable platter is driven by the idler wheel 108 which is automatically disengaged from the motor pulley when the unit is shut off in order to protect its driving surface Turntable speeds of 33 1 3 45 and 78 rpm are selected by raising or lowering the idler wheel 108 to...

Page 5: ...lley is not correct for local line frequency b Slippage between idler wheel 108 and motor pulley 120 or platter c Excessive friction in motor drive wheel or platter bearings Worn idler wheel Idler wheel does not contact motor pulley correctly Remedy Remove turntable platter with the help of a screwdriver inserted through the hole in the chassis placed there for the purpose Loosen screw on tonearm ...

Page 6: ...s The scale is calibrated over a range of 0 to 5 5 grams allowing an exact setting of stylus within that range in 0 5 gram steps To replace the tonearm with its bearing assembly the following proce dure is recommended 1 Secure the unit in the repair jig set the stylus force to zero and lock the tonearm in place 2 Turn the unit tipside down and unsolder the tonearm leads 3 Remove main lever 204 and...

Page 7: ...mpted only with the help of the Dual Skate 0 meter and test record L 096 This work is best done by an authorized Dual service agency Symptom Fig 9 Anti skating a Anti skating in 0 b Anti skating mechanism in 1 5 on the scale for conical styli Tonearrn on rest position c See b tonearm onty over turntable Causa Remecty Radius for saniere styli Radius r elliptical styli Anti skating 1 Skating force A...

Page 8: ... is done with the indexing lever 33 Setdown points are determined by the eccentric portion of the arm position ing slide 243 and the indexing lever 242 192 Horizontal movement of the tonearm is limited by the arm segment striking the arm positioning slide 243 During the change cycle the main lever 204 raises the 234 arm positioning slide bringing lt within reach of the spring stud On completion of...

Page 9: ...d the motor pulley 120 At the same time the power switch 141 is actu ated by the switch slide 138 through the switch arm and the turntable begins to rotate b The switch lever 181 is brought within reach of the cam follower lever 236 so that it is pushed into the change position after the rotation of the main cam a Adjust set dwon with a 12 record so that stylus touches record aproximately 1 16 ins...

Page 10: ...est This will automatically re adjust the shut off lever which may have shifted out of position 191 185 146 242 Manual start When the tonearm 16 is swung inward by hand the pawl on the switch arm drops into a support on the base plate holding the switch arm in this position and the idler wheel 108 in contact with the platter The slide 138 1inked with the switch arm actu ates the power switch and s...

Page 11: ... 15 Record drop Shut off and change cycle The dog M on the turntable platter gear PR and the shut off lever 222 actuate both the change cycle at the end of the record as well as the shut off after the last record in a stack is played o 4 3 4 roge 27 9 f 1 7 4 et eli w it 144 g At the end of a record the tonearm moves towards the center at an accelerated rate due to the increased pitch of the groov...

Page 12: ...emains in its stop position and allows the tonearm to swing to its rest position When the main cam 197 returns to its neutral position the switch arm 143 drops into a cut out in the main cam opening the power switch 141 and disengaging the drive idler 108 Symptom Turntable stops after automatic setdown of the tonearm Cause a Switch arm 143 is not latched by pawl 194 b Power switch opens Remedy a L...

Page 13: ...it is switched to stop Cause Cam rocker 171 not caught by start lever Remedy Adjust cern rocker so that at the conclusion of the stop function the start lever runs about 1 16 under the follower Symptom Records do not drop Cause Cam rocker 171 has too little force travel Remedy Re adjust eccentric so that when the three supports in the automatic spindle are held in and the main cam is at its neutra...

Page 14: ...ng force Muting switch misadjusted Dis tance between contact springs and shorting contact is too great a Adjust skating lever so that horizontal movement of tonearm causes no movement of anti skating spring b Allow some slack in tonearm leads Bend contacts so that in the neutral position of the main cam the spacing between contacts is about 0 02 inch Clean contacts Spacing too small See above Moto...

Page 15: ...Stop nut 1 29 215 430 Cartridge mount TK 14 complete 1 30 218 636 Set screw 1 31 207 839 Damping ring 1 32 221 726 Switch lever right 2 33 221 726 Switch lever right 2 34 210 146 C ring 3 2 5 35 216 881 Arm lift lever complete 1 36 210 353 Hex nut BM 2 1 37 225 104 Weight complete 1 23 1 38 221 511 Threaded pin f cse 1 39 223 003 Tonearm bearing complete 1 40 217 273 Spring barrel complete 1 41 22...

Page 16: ...Fig 24 Exploded view parts above chassis 0 0 94 r 9 C o e z 16 ...

Page 17: ...Fig 25 Exploded view Parts belovv chassis z 17 ...

Page 18: ... 986 Roller for switch slide 1 137 214 181 Screw bolt 1 138 213 970 Switch slide complete 1 139 217 062 Cover for power switch with voltage selector 1 214 207 Cover for power switch lass voltage selector 1 223 007 Cover for power switch with voltage selector and SEMKO capacitor 1 140 210 492 Machine screw AM 3 x 15 1 141 217 059 Power switch complete with voltage selector 1 214 205 Power switch co...

Page 19: ...asher 3 2 5 197 220 332 am wheel complete 1 198 200 519 Bearing post 1 199 210 366 Hex nut BM 4 8 200 200 528 Shaft 1 201 201 185 Bearing support 1 202 210 475 Machine screw AM 3 x 5 13 203 210 145 C washer 2 3 9 204 201 094 Main layer complete 1 205 210 366 Hex nut BM 4 8 206 201 195 Cover washer 1 207 217 290 Drive washer complete 1 208 217 286 Support bracket assembly 1 209 217 296 Torsion spri...

Page 20: ...g 1 258 209 436 Flat prong socket 4 259 213 980 Input jack housing 1 260 213 984 Power cable with U S type plug and 5 pole Dual plug 1 207 311 Power cable with U S type plug and 4 pole Dual plug 1 261 209 424 Miniatur plug for audio cable 1 262 207 303 Audio cable complete with miniatur plug 1 263 220 142 Power cable complete with 5 pole Dual plug 1 207 312 Power cable complete with 4 pole AMP plu...

Page 21: ...rings are provided with oil retainers and sintered bearings Lubrication should be applied sparingly lt is of primary importance that no oil grease should get onto the friction sur faces of the drive wheel motor pulley or turntable to avoid slippage For the same reason avoid touching these parts Use the following lubricants Adhesive iI Renotac No 342 BP oil Super Viscostatic 10 W 30 Shell Alvania N...