Lenco-C1102-tape-sm 电路图 维修手册.pdf

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1、RadioFans.CN 收音机爱 好者资料库 Contents Electrical Alignment Instructions Page - Technical data . 3 - Playback . 4 1. Azimuth Adjustment 2. Tape Speed Adjustment 3. Output Level Adjustment 4. DNL Adjustment - Recording . 4 1. OSC Frequency Adjustment 2. Bias Trap Adjustment 3. Bias Current Adjustment 4. Do

2、lby Nr. Bias Trap Adjustment 5. Input Sensitivity Adjustment 6. Level Meter Adjustment 7. Record Current Adjustment 8. Peak Indicator Level Adjustment 9. ALC Balance Adjustment - Electrical Adjustment Procedure . 5+6 1. DC F.G. Servo Motor 2. RIP Head (Azimuth) 3. Dolby P.C.B. 4. DNL P.C.B. 5. Power

3、 P.C.B. 6. Pre Amp. P.C.B. Mechanical Alignment Instructions Page - Tape Speed. 7 - Wow and Flutter . 7 - Mechanical Adjustment . 8 + 9 1. Pinch Roller Pressure Measurement 2. Azimuth, Head Location Adjustment 3. Tape Speed Adjustment Location Mechanical Parts List . 10-14 - Take-up Torque . 7 - Fas

4、t Forward and Rewind Torque . 7 - Pinch Roller Pressure . 7 - Tape Speed / Wow and Flutter . 7 - Azimuth Head, Alignment . 7 Electrical Parts List . 15-21 Drawings - Muting SW P.C.B. . . 22 - Reed SW P.C.B. . . 22 - Mic Jack P.C.B. . . 23 - Auto Stop P.C.B. . . 24 - DIN/RCA Jack P.C.B. . . 25 - Powe

5、r Supply P.C.B. (Bottom View) . 26 - Power Supply P.C.B. (Top View) . 27 - LED P.C.B. . . 28 - Peak Level LED P.C.B. . . 28 - PRE P.C.B. (Bottom View) . 29 - PRE P.C.B. (Top View) . 30 - Dolby P.C.B. (Bottom View) . 31 - Dolby P.C.B. (Top View) . 32 - Push SW P.C.B. (Bottom View) . 33 - Push SW P.C.

6、B. (Top View) . 34 - DNL P.C.B. . . 35 - Exploded drawings . . 36+37 - Exploded and Lubrication drawings . 38+39 Wiring Diagram. 40 Electrical Circuit Diagram . 40 RadioFans.CN 收音机爱 好者资料库 Technical data Mains voltage: 220 V, can be resoldered for 110 V (Europe) 240 V (UK) 117 V (USA, ANP, Canada) Ma

7、ins frequency: 50 - 60 Hz Power requirement: 0 W Motors: 1 DC-motor with servo control Cassettes: Compact cassette: Chrome dioxide BASF CrO2 C 60 C 401 R Standard TEAC MTT-502 Tape speed: 4.76 cm/s Fast forward and rewind: 75 s with C 60 cassette Erase and bias frequency: 105 kHz Level meter: 2 VU-m

8、eter 1 Peak Level Indicator Dolby Level at 3 dB Inputs: (for Dolby level) 1. Microphone input with DIN plug for low-impedance microphones Sensitivity: 330 V imped. about 5.6 kOhms Max. input voltage: 33 mV Electret microphones: + 5 V max. 0.5 mA 2. Input DIN plug connections 1 + 4 Sensitivity: 0.33

9、mV impedance: 5.6 kOhms (0.06 mVikOhm) Max. input voltage: 33 mV 3. Line input PHONO plug Sensitivity: 33 mV impedance: 560 kOhms Max. input voltage: 3.3 V 4. Phono Input (DIN) DIN Plug connection 3+5 Sensitivity: 200 mV impedance: 3.3 mOhms Outputs: (for Dolby level) 1. DIN plug, pin 3+5: 1000 mV i

10、mpedance: 15 kOhms 2. LINE output (PHONO): 1000 mV impedance: 15 kOhms 3. Headphone output: 200 mV impedance: 8 kOhms Harmonic distortion (333 Hz): (for 0 dB VU) Standard cassette: 2.0 % Ferri chrome cassette: 2.0 % Frequency response with: - 20 dB VU Standard cassette: 30-15000 Hz 3 dB Ferri chrome

11、 cassette: 30-16000 Hz 3 dB Wow + Flutter: to WRMS 0.06 % to DIN 45507 weighted 0.14 % Drift: 60 dB with stereo recording: 35 dB Erase attenuation: (1000 Hz, full modulation Cr02 tape) 62dB Weight: 5.5 kg Dimensions: 268 x 424 x 107 mm RadioFans.CN 收音机爱 好者资料库 Alignment Instructions Playback 1. Azimu

12、th Adjustment Connect a scope or VTVM to the right channel PRE-AMP OUTPUT jack. Insert a test tape (TEAC MTT-114, 115) into the unit. Adjust the Azimuth adjusting screw for maximum output into the right channel. (See figure 1 R/P HEAD.) 2. Tape Speed Adjustment Connect scope, VTVM and FREQUENCY COUN

13、TER to the right channel PRE-AMP OUTPUT jack. Insert a Test Tape (MTT-111 3 kHz) into the unit. Adjust the tape speed adjusting screw for a 3 kHz value in the frequency counter. (See fig. 1 DC F.G. Servo Motor.) 3. Output Level Adjustment Connect scope and VTVM to the TP-2 and Ground (L-ch and R-ch)

14、. Insert a test tape MTT-150 (Dolby level calibration tape 200 nwb/m) into the unit. Adjust the P 104 (left) and P 204 (right) for a 580 mV reading. 4. DNL adjustment Connect a scope to the PRE-AMP OUTPUT jack. Set the unit for a PLAY function, then depress the PAUSE button, DNL switch, ON. Adjust t

15、he VR 501 (L-ch), VR 601 (R-ch) so that the level of high frequency noise is at a minimum on the scope. (See fig. 1, DNL P.C.B.) Recording 1. OSC Frequency Adjustment Connect the scope and frequency counter to the terminals of the erase head. Set the unit for recording. Adjust L 1 so that there is a

16、n OSC frequency value of 105 kHz on the frequency counter. (See fig. 1 Power P.C.B.) 2. Bias Trap Adjustment Connect the scope and VTVM to the TP-3 and Ground. (See fig. 2.) Set the unit for recording. Adjust the L 104 (L-ch) and L 204 (R-ch) so that the level on the VTVT is at a minimum. (See fig.

17、2.) 3. Bias Current Adjustment AF Generator 333 Hz 1 kHz 0 dB - 1 V Attenuator - 95 dB Unit Mic. Input L R V.T.V.M. Scope Connection should be made as above. Set the unit for recording. For Fe 203, adjust C 133 (L-ch), C 233 (R-ch) to flat level at between 333 Hz and 10 kHz. For Cr02, adjust C 134 (

18、L-ch), C 234 (R-ch) to flat level at between 333 Hz and 12,5 kHz. (See figure 2.) 4. Dolby NR Bias Trap Adjustment Connect the VTVM and scope to the test point pin on the Dolby P.C.B. (See figure 1). Set the unit for recording. Dolby NR switch ON position. Adjust L 303 (L-ch), L 403 (R-ch) for the m

19、inimum indication on the VTVM. 5. Input Sensitivity Adjustment AF Generator 333 Hz 0 dB - 1 V Attenuator -70 dB Unit DIN Input L R TP-2 V.T.V.M. Scope Connection should be made as above. Set the unit for recording. Record level controls (P 103, P 203) set at maximum. Adjust P 102 (L-ch), P 202 (R-ch

20、) for 580 mV reading at TP 2 (L-ch, R-ch). (See figure 2.) 6. Level Meter Adjustment Connection should be made as for ADJUSTMENT 5. When ADJUSTMENT 5 has been completed (580 mV rading at TP a), adjust P 107 (L-ch), P 207 (R-ch) for +3 VU reading on level meters (L-ch, R-ch). (See figure 2.) 7. Recor

21、d Current Adjustment Connection should be made as in ADJUSTMENT 5. Feed -70 dB (333 Hz) into the DIN input. Set the record level controls (103/203) to maximum. Make a recording (use blank tape) then playback what has been recorded and adjust P 105 (L-ch), P 205 (R-ch) for Fe 203 Tape, P 106 (L-ch),

22、P 206 (R-ch) for Cr02 Tape so that the output at TP 2 has a value of 580 mV. (See figure 2.) 8. Peak Indicator Level Adjustment Set the unit for recording. Feed -68.5 dB (1 kHz) into the DIN input Left and Right channels. Adjust P 2 until the peak level indicator lights up. (See fig. 2). AF Generato

23、r 1 kHz 0 dB = 1 V Attenuator -68.5 dB (1 kHz) DIN Input L R Unit 9. ALC Balance Adjustment Disconnect R 1 (or cut the foil pattern) so that the Bias OSC is stopped. Set the ALC switch to the ON position and keep the unit set at recording. Feed -50 dB (1 kHz) signal into the DIN input Left and Right

24、 channels. Adjust P 1 so that the value of the level meter on Left and Right channel will be the same. (See figure 2 ALC BALANCE). AF Generator 1 kHz 0 dB = 1 V Attenuator -50 dB (1 kHz) Unit DIN Input L R Mechanical Checks and Adjustments Model C 1102 Note: All the mechanical checks and alignments

25、should be done with the upper and bottom cabinet assembly (A-1 and A- 2) removed. Take-up Torque (Spec. 30-60 g/cm) 1. Load the torque meter cassette. 2. Set the unit in the play mode and read the value on the dial scale. The meter should indicate a torque of 30 to 60 g/cm. 3. If the torque range is

26、 out of the specified limit, clean the driving surface of the take-up reel base shaft assembly (B 1-8) and tape-up pulley assembly (B 1-12) with pure alcohol. 4. If the above cleaning proves ineffective for a correct tor? que alignment, replace the take-up reel base shaft as? sembly. 5. First, remov

27、e the reel table assembly (B 1-12), then pull out the take-up reel base shaft assembly. After putting a drop of oil on the reel shaft (B 1-17), insert the new part and then fit the reel assembly onto its shaft. Finally tighten two set screws (L 1-1). Fast-Forward and Rewind Torque (Spec. 65-120 g/cm

28、) 1. Load the torque meter cassette. 2. Set the unit at F.F. or REWIND mode and read the value on the dial scale. The meter should indicate a torque of 65 to 120 g/cm. 3. If the value is outside the specified range, clean the driving surface of the fast forward pulley A assembly (B 1-14), fast forwa

29、rd pulley B (B 1-13) and C (B 1-14). 4. If the above cleaning operation is ineffective for a torque alignment replace the fast forward pulley A assembly. 5. To replace, first remove the fast forward and rewind arm A assembly (B 1-29). Pinch Roller Pressure 1. Place the unit in the play mode (but wit

30、hout a loaded tape). 2. Attach the spring scale to the edge of the pinch roller as? sembly (B 1-18) as shown (fig. 1). 3. Gently draw the pinch roller assembly away from the capstan shaft (in a direction parallel to a line that inter? cepts the centre of the capstan shaft and the pinch roller) until

31、 the capstan shaft and the pinch roller are completely separated. 4. Gradually lessen the pressure until the pinch roller just begins to rotate. The scale should then read approximately 500-650 g/cm. 5. If the scale reading is outside the above range, replace the pinch roller spring (B 1-61) or adju

32、st the spring arm as shown. 6. After the replacement, install the pinch roller adjusting nut (B 1-87) with 1 mm vertical clearance. Check whether the pinch roller is vertical to the capstan. Tape Speed / WOW and Flutter Note: Before commencing the following alignments, make sure that all parts in th

33、e tape path, particularly the capstan, pinch roller and head, are cleaned with pure alcohol. Head Azimuth Alignment 1. Connect the AC vacuum tube voltage meter to both chan? nels of the Line-out. 2. Use a test tape (in which 10,000 Hz signal is recorded). 3. To achieve the maximum reading on the AC

34、VTVM adjust the azimuth alignment screw (fig. 2). 4. After the adjustment, fix the screw with lacquer. Tape Speed (Spec. 3000 Hz 45 Hz) 1. Connect the frequency counter to both channels of the line- out. 2. Set the EQ switch to normal position, then load and play a TEAC MTT-111 test tape in which a

35、3000 Hz signal is recorded. 3. Adjust the control located at the top of the meter for a reading of 3000 Hz 5 Hz on the frequency counter (fig. 3). (This tape speed alignment should be done after approx. 30 seconds operating time). 4. Then, verify the reading on the frequency counter as being within

36、the specified range 3000 Hz45 Hz at the beginning, middle and near the end of the tape. Wow and Flutter (Spec. DIN weighted: within 0.2% at record and playback) Note: When using these methods, obtain the maximum wow and flutter value, by repeated play, stop or pause mode of operation. This operation

37、 ls necessary to make sure that the wow and flutter value between record and playback will not create a false reading. 1. Connect the oscillator to the line-in of the unit, and the wow and flutter meter to either channel of the line-out. 2. Set line or record controls of the unit to obtain the optim

38、um input level. 3. Load a test tape (BASF C 60) and set the BASF/EQ switches to the normal position. 4. Apply and record a 3000 Hz signal. 5. Record and play the recorded section. 6. Read the value on the wow and flutter meter. The wow and flutter value should be within 0.2 %, DIN max. 7. If the mea

39、sured value is out of specification, check the take- up torque and pinch roller pressure, and see that the capstan or belt is not stretched or oily. 8. If the above checks prove ineffective, repair or replace the pinch roller assembly (B 1-6), motor and any other defective parts. 9. When the capstan

40、 assembly must be replaced, make sure it is weil oiled. Re-adjust the end clearance by adjusting the thrust-screw (B 1-111) until the clearance is between 0.15-0.3 mm. Parts List CP-637 L (Lenco C 1102) Mechanical Parts Reference No. Descrlption Lenco Part No. Quantity Unlt Price A-1 Cabinet Assembl

41、y, Top 21C7384X 1 Consists of following: A-1 Cabinet, Top 21C7384 1 A-16 Window, Tapecounter 21W7472 1 B 2-37 Cover, Volume Control 24W7808 1 A-2 Cabinet Assembly, Bottom 21C7386X 1 Consists of following: A-2 Cabinet, Bottom 21C7386 1 A-12 Rubber, Foot 21W7299 4 B 2-32 Paper, Shield 24W7641 1 A-3 Do

42、or Assembly, Cassette 21C7392X 1 Consists of following: A-3 Door, Cassette 21C7392 1 A-4 Window, Cassette 2107088 1 A-23 Spring, Cassette Setting 23W9627 2 A-5 Box, VU Meter 21C7389 1 A-6 Cover, Microphone Jack 21C7390 1 A-7 Door, Microphone Jack 21C7391 1 A-10 Button, Push Switch 21N7597 5 A-11 Button, Power Switch 21N7598 1 A-13 Button, VU Meter Box 21N7602 1 A-14 Button, Tapecounter 21N7603 1 A-15 Knob, Volume Control 21N7604 2 A-17 Decoration Plate, Azimuth Hole 21W7473 1 A-18 Plate, Rating (220 V, 50 Hz) 23M7885 1 A-22 Plate, Rating (240 V, 5