Teac A-650 Service Manual Download | Manualshive

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Summary of Contents for A-650

Page 1: ...formation to assist the skilled service technician to prop erly repair adjust and maintain the TEAC A 650 Stereo Cassette Tape Deck The A 650 is a high quality deck designed to be used as an indispens...

Page 2: ...g 24 VU Meter Calibration Record 24 LED Peak Level Indicator Calibration DOLBY NR COPY OUT FM Switch Function Check Recording Performance Bias Trap Adjustments Record Bias Setting Record Level Setting...

Page 3: ...netizer 17 Cleaner 18 Oil For take up torque check For fast forward rewind torque checks String Length about 50 cm 20 Cassette Reel Adapter Diameter 22 mm The tools above 1 3 are constructed as shown...

Page 4: ...phones Specified output level 15 7 dB 130 mV 8 ohms EQ 1 3180 ms 70 ms for CrO2 tape EQ 2 3180 ms 70 ms for FcCr tape EQ 3 3180 ps 120 ms for regular Hi Fi tape 1 2 track 1 channel Erase Head 1 4 trac...

Page 5: ...on used for recording and playback S N ratio is improved by 5 dB at 1 kHz and 10 dB at frequencies over 5 kHz 65 dB minimum 30 dB minimum at 1 kHz 40 dB minimum at 125 Hz BIAS EQ 1 2 5 maximum BIAS EQ...

Page 6: ...D HALL EFFECT ELEMENT FLYWHEEL I 7 576 Top View Fig 3 1 SUPPLY REEL TABLE LED PC BD VU METERS POWER SWITCH MIC JACKS ERASE HEAD PHONES JACK T 575 Front View Fig 3 2 6 1 I DRIVE BELT PAUSE SOLENOID TAK...

Page 7: ...s Demagnetize tire tools before use When mounting or removing a spring pay heed to the position direction of the anchor or hook The wrong position may result in a change in the tension BSB M3x6i b 3 B...

Page 8: ...ivot stud pin of the Plate Take off the 2 screws H from the transport chassis Loosen the 2 screw G to separate the Cassette Holder Door F and the Cassette Holder E Detach the Door F from the chassis R...

Page 9: ...place the Flywheel together with the Capstan Housing Ass y Clean all driving surfaces of the Flywheel and the Drive Belt with TEAC TZ 261 Cleaner kit A for Flywheel B for Belt or with pure alcohol Do...

Page 10: ...er Ass y B clean the driving surface of the Idler with the TEAC TZ 261B Rubber Cleaner or with pure alcohol 3 PSA M2 6x6 O F n gf E 2 5 sb Remove whole Reel Motor Ass y J from the mount ing studs by t...

Page 11: ...cc of Oil here NOTE Always replace tire complete Reel Table Ass y as an entire assembly Take up or Supply NOTE Lubrication should be generally done at about every 1 000 hours of operating time of the...

Page 12: ...ndicate Force of 36 64 g 1 3 2 2 oz This corresponds to a torque of 40 70 g cm 0 6 1 0 oz inch For the torque calculation refer to Fig 5 2 If the reading is out of specified range clean the driving su...

Page 13: ...t of specified range adjust the tension of die Pressure Spring by bending the tab of the Pinch Roller Ass y slightly 1 2 C 33 T 620 Fig 5 6 Brake Tension Adjustment 5 TORQUE MEASUREMENT USING THE CASS...

Page 14: ...sure and the tape driving function for correction and make sure the tape path is clean 1 2 3 Play the MTT l 11 test tape Read the indication on the wow and flutter meter The wow and flutter value shou...

Page 15: ...e to create a false reading Connect test equipment to the deck as shown in Fig Set LINE and OUTPUT controls on the deck to obtain convenient input and output levels Flywheel Thrust Adjusting Screw Clo...

Page 16: ...Switch Be sure that when inserting any cassette tape in the Cassette Holder and closing it the Cassette In Switch S509 is actuated to run the Capstan Motor If the Capstan Motor does not rotate loosen...

Page 17: ...he Cassette Holder after the Record Preventing Arm is completely pulled out of the record protection tab hole The Cassette Holder always should remain locked even when any place on the Cassette Holder...

Page 18: ...be achieved When either Fast Forward Rewind PAUSE or STOP Button is depressed the Play mode should be dis engaged The PAUSE function should be engaged only when the PAUSE Button is depressed When the...

Page 19: ...for other than spec ified items are done in the sequence of left channel then right channel Double designated REF NO in dicates left channel right channel example VR 101 201 Value of dB in tire text r...

Page 20: ...COPY calibration Record bias 1 Record bias 2 Record bias 3 Bias trap Bias trap Record EQ 1 Record EQ 2 Record EQ 3 VR602 o I DC24VADJ O CD 0 Ct VR60 g I DC 13V ADJ Q 8 tn o z m 8 Or i BIAS TRAP LIO I...

Page 21: ...VTVM Secure the nut with a drop of locking paint Control Setting OUTPUT Set for convenient output level 1 2 NOTE Except for the Playback Frequency Response checks all alignments in the PLAYBACK PERFO...

Page 22: ...e specified output level At this time the physical position of the OUTPUT controls indi cates the Specified Control Setting referred to in sub sequent procedures MTT 116U 3 position SPKR OSCILLOSCOPE...

Page 23: ...ecified output level 5 dB 435 mV Load and play a TEAC MTT 150 test tape Measure the level across the test load resistor Load and play a TEAC MTT 150 test tape Adjust VR103 203 for 3 VU HI on the VU me...

Page 24: ...maximum Apply a 400 Hz signal at 19 dB 2 dB 69 mV 109 mV to the LINE IN jacks and check for 580 mV Minimum Input Level checks for the LINE inputs lights at full intensity LINE MIC DIN NOTE To prevent...

Page 25: ...d in this procedure must have load impedance of IM ohm or more Load any recordable tape Place the deck in the RECORD PAUSE mode Apply a 400 Hz signal at 9 dB 274 mV Make sure the VTVM indication is 5...

Page 26: ...at 39 dB 8 69 mV and a 10 kHz tone at 39 dB 20 Rewind and play this recorded section 21 Compare the differences between the output level of the 400 Hz signal and that of the 10 kHz signal 22 The outp...

Page 27: ...itches 3 position Test tape MTT 501 Adjustments VRI05 205 VTVM E o o LINE IN IL FrT OSCILLOSCOPE O s OUTPUT LI Hi Fi TAPE 6 Repeat the above CrO2 TAPE procedure with the following ex ceptions B1AS EQ...

Page 28: ...his recorded erased section Read the indication on the VTVM The VTVM should indicate 51 dB minimum 2 18 mV maximum This 51 dB corresponds to the specified signal to noise ratio of 46 dB minimum the di...

Page 29: ...IN MPX switch at IN and OUT positions The output level should vary 4 dB to 7 dB between the IN and OUT positions The output level in the IN position should be lower than the OUT position Repeat the ab...

Page 30: ...sed 5 Control Setting OUTPUT Specified Setting See 6 2 2 Specified Setting See 6 3 2 Minimum Setting record Load tape Apply and record a 1 kHz signal at 1 dB 0 869 V for several seconds I Rewind the t...

Page 31: ...he deck in the record mode for about 30 seconds I Rewind the tape to the starting point of recording 2 Play the tape and measure the output level differences between the left and right channels 3 A NO...

Page 32: ...M o o Control Setting OUTPUT Specified Setting See 6 2 2 Specified Setting See 6 3 2 Minimum Setting Load a TEAC MTT 5O5B test tape Apply a 100 Hz test signal at 9 dB 274 mV Place the deck in the reco...

Page 33: ...S Si s 3 i 3 5 s 3 I fel i i J II t x J I l I n il if I l o r T a U Jj 2 X J it__ K 8 s S B 1 u L dr r nsT T Eh h o 2 5 2 i 1 f I i j cL u uj C ai I il isu II I I JI I I S A Tt sLsi 2 rr T J T il s 1...

Page 34: ...d Output Level LINE VR402 MIC VR40I are posi tioned at Specified Input Level Each level given in the diagram shows values when a 400 Hz Specified Input Level is applied 03 CUT 0109 _L 35dB_ p J___ 2Sd...

Page 35: ...witch Defective Trimmer Capacitors VC602 VC604 VC606 Defective Parts associated with parts indicated above Cannot erase also Bias Oscillator Ass y faulty Can erase sound from record monitor mode is no...

Page 36: ...3 NAKA CHO MUSASHINO TOKYO PHONE 0422 53 1111 7733 TELEGRAPH ROAD MONTEBELLO CALIFORNIA 90640 PHONE 21 3 726 0303 FLAT 78 PORTLAND HOUSE 7TH FLOOR BLOCK C No 41 D MA TAU WEI ROAD KOWLOON HONG KONG PHO...

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