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1、SERVICE MANUAL r.llpage ,_ ! . ui) . . ., . . . . -. lff S-t.- ALPINE ELECTRONICS INC. Contents Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Parts Location and Disassembly Instructions . 3 to 5 A
2、djustment Procedures . 6 to 8 Adjustment Locations . 9 to 10 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 to 12 Replacement of Mechanical Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3、. . . . . . . . . . . . . . . . . . 13 to 14 Trouble Shooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 to 18 Parts Layout on P.C. Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、. . . . . . . . . 19 to 26 Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 to 28 Schematic Diagram (1/2) . 29 to 30 Schematic Diagram (2/2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . 31 to 32 Electrical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 to 47 Packing Method View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . 48 Packing Assembly Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 Cabinet Assembly Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7、. . . . . . . 48 to 49 Exploded View (Cabinet) . 50 to 51 Exploded View (Cassette Deck) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 to 53 Cassette Deck Assembly Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8、 . . . . . . . . . . . . . . . . . 54 Semi-Conductor Lead Identifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to 57 Specifications Power Consumption . 35W Power Source . _ 110/127 /220/240V AC 50/60 Hz ( For Multi Voltage Model only) 120V AC
9、 60 Hz ( For Single Voltage Model only) Tape Speed (MTT-111 ) . 4.76 cm/sec. 2% Wow 100mV/50K ohm; Mic; 0.3mV/600 ohm Semi-conductors . 17 !Cs, 68 Transistors, 50 Diodes, 4 Zener Diodes, 1 Bridge Diode Dimensions . 435(W) x 116(H) x 254(0) rn m Weight . 5.61-ff 1: .: t-61:l . -. -. ,t.:.,1, t , ,:.,
10、 / .ft;:)., ,I - PHONES jack BIAS FINE ,ootml k,-bC _: _ -I -. ./:, I :IGHT MIC jack STOP switch ( LEFT/MONO MIC jack TAPE SELECT knob OUTPUT LEVEL/PHONES LEVEL Pause indicator (Yellow) PAUSE switch ( 11 ) DOLBY N R select knoh- control knob REC LEVEL (L/R) control knobs REC MUTE switch ( o) Figure
11、1 AUTO PLAY/AUT REW indicators (Green) MONITOR (SOURCE/TAPE) indicators (Amber/Green) MEMORY EXECUTION indicator (Green) TEST OSC indicator (Red) AUTO PLAY switch AUTO REW switch TEST OSC switch REC CAL (L/R) control dials MONITOR switch COUNTER switch MPX FILTER switch MEMORY switches CLEAR switch
12、Figure 2 EOUTPUTjacks LINE INPUT jacks FREQUENCY selector switch Figure 3 -3- 11111111111111111 fJ AC supply cord Voltage selector switch (For Multi-voltage Model only) REMOTE jack - 1. Removal of Top Cover (1) Remove six screws marked o as shown in Figures 4 and 5. (2) Remove the top cover in the d
13、irection of the arrow as shown in Figure 4. 2. Removal of Front Panel, Keyboard Switch P.C. Board, REC CAL P.C. Board and Dolby (C) LED P.C. Board (1) Pull out four knobs as shown in Figure 4. (2) Remove the cassette door upward as shown in Figure 4. (3) Remove the link spring as shown in Figure 10.
14、 (4) Remove eight screws marked as shown in Figures 5 and 6. (5) Disconnect all connectors from the REC CAL P.C. Board, Keyboard Switch P.C. Board and Dolby (C) LED P.C. Board. (6) Remove the front panel from the chassis. (7) Remove a tack, remove the REC CAL P.C. Board as shown in Figure 7. (8) Rem
15、ove a screw marked ,remove the Dolby (C) LED P.C. Board as shown in Figure 7. (9) Pull the Keyboard Switch P.C. Board winding the hooks carefully as shown in Figure 7. 3. Removal of Rear Cover (1) Remove ten screws marked I. as shown in Figure 5. (2) Remove two tacks as shown in Figure 5. (3) Remove
16、 the rear cover. REC CAL P.C. Board Keyboard SW. P.C. Board Hooks Tack Dolby (C) LED P.C. Board Front Panel (Back Side) Figure 7 Front Panel Direction of top cover removal Top Co, Cassette Door Figure 4 0 Bottom,0. Multi-Voltage Model only Rear cover Figure 5 0 ii - . - :;/ _ l . l_, - Figure6 -4- 1
17、 4. Removal of Optical Meter with Lamp P.C. Board and FL Counter P.C. Board (1) Remove two screws marked * as shown in Figure 8. (2) Remove the crystal meter and frame meter as shown in Figure 9. (3) Pull out the optical meter as shown in Figure 8. (4) Disconnect all wires from the optical meter and
18、 both P.C. Boards. (5) Remove the optical meter with Lamp P.C. Board, and FL Counter P.C. Board. 5. Removal of Master Board P.C. Board (1) Remove four screws marked ! as shown in Figures 6 and 8. (2) Remove two tacks as shown in Figure 6. (3) Remove two mic jack stoppers as shown in Figure 9. (4) Re
19、move two nuts (Bias Fine/Phone Level) as shown in Figure 9. (5) Remove two screws marked QS) as shown in Figure 9. (6) Disconnect all wires from the P.C. Board. 6. Removal of Power 18000Hz Adjust for VR505 E flat of fre- Tape: Nor. VR506 quency Re- 13dBl 20.,1700GHz sponse When the frequency respons
20、e becomes up or down because of unevenness of the head or tape running, readjust following instruction. Refer to Figure 15, 17. 1. Up or down less than 10 KHz. CrO2 . VR511,512EQ Readjust by VR515 and VR516. (Metal) FeCr . VR509, 510 Volume Nor . VR505, 506 -7- AL-80 Step Description Mode Adjust Tes
21、t Connection Remarks Points Points Instruction 2. Up or Down about 14 KHz. Refer to Figure 16, 17. CrO2 . VR517, 518 B V R522 ,as 10 Readjust by VR519 and VR520. (Metal) FeCr . VR521 Volume Nor . Bias Trap Rec/Play T.P.7 Test Signal Input Tape: Metal Figure 13 : 400 Hz, 17mV Adjustment N R: C positi
22、on T.P.8 (300mV -25 dB) 11 ( 1 ) Pre Amp. L251 Adjust for min. output L252 (2) Dolby L351 Adjust for min. output L352 Note: Bias: OFF Remove A connector from the master P.C. Board to the erase head. Connection Instruction PLAYPACK 0 T.P.5, 6/T.P.7, 8 Unit Figure 11 LINE IN AC VTVM T .P .11, 12 Signa
23、l Generator T.P.7, 8 T.P.1, 2/T.P.3, 4/T.P.9, 10 N CXl CXl NN 0: 0: Figure 12 T.P.7, 8/ T.P.13,14 AC VTVM fflr o -j Signal Generator Unit AC VTVM Figure .13 Distortion Meter Frequency Respose Playback EO Frequency Response. When changing under 10 kHz, adjust the EO volume. 2 kHz 10 kHz -:,. Frequenc
24、y -Frequency Figure 14 Figure 15 When changing around 14 kHz, adjust the bias volume. Examples: R/P Frequency Response 14 kHz -Frequency -Frequency . Flattens with EO volume. Figure 16 . Flattens with bias volume. . ,Check the peak point of playback and recording, Fi9ure 17 -8- ei . l , R50T ,-; 1,
25、. 11 -I, I pill :-VR,59q:, (;: , .J w -w .!. .J 0 NU Ct: w Ct: LEFT LINE IN E20! _ I_., 3: (/) u (/) -0 LEFT MIC IN !E202l RIGHT MIC IN TEST OSC 400HZ LEFT PLAYBACK HEAD HD501-3 r-1 1 POWER a 1 I CONTROL I CIRCUIT I L _ J L.() N a: C DOLtEy OFF SELECT SW. S301-I w u Ct: : 0 (/) TAPE ;._-rMONITOR SW.
26、 S802-I IC 901 P. 8. MUTE MUTE REC. MUTE CIRCUIT POWEH ON/OFF MUTE -11 AL-80 , LEFT -:J.-,-c RECORD HEAD f H050H _J w _ w, _Jr) 1-0 :) :) 0 REC +B BIASOSC S. BIAS FINE 1-,v Cl RCUIT t-,- ERASE HEAD HD502 0.8. METER E401 TO RIGHT LEFT LI NE AMP ; r- LINE OUT E201-3 ,. - PHONES OUT E451 TO RIGHT PHONE
27、S AMF r-7 I POWER S. CONTROL I L _ -_ .J AC PLUG CORD POWER SUPPLY r-7 +2ov - MASTER I t=;:;+12v- I EIOI O PLAY -I BOARD I o REC I I a r-;- o NN REGULATOR Q + PLAY STOP FF REW PAUSE REC REC MUTE -.-:1 CIRCUIT I L _ _J +f:i: REC MUTE I FUNCTION KEYS EBOI REMOTE DIN JACK 12 CONTROL CIRCUIT IC601 IC602
28、 IC603 SOLE NOID MOTOR DRIVE PLAY FF REW SOLENOID DC MOTOR 1r;r-AL- FL COUNTER a FUNCTION SWITCH CIRCUIT MEMORY ( WRITE CALL EXECUTION CLEAR AUTO PLAY AUTO REW COUNTER/Tl ME ) ) I I Replacement of Mechanical Parts Removal of Cassette Deck Prior to Replacement Procedures, remove the cassette deck ass
29、embly according to Removal of Cassette Deck on page 5. Replacement of Head ( 1) Remove two screws marked * from the cas- sette door bracket of the cassette deck as shown in Figure 18 and the cassette door can be re- moved. (2) Remove two screws marked o and wires from both sides of the R/P head A as
30、 shown in Figure 19, and it can be removed, with head P.C. Board. Remove the head from the P.C. Board with a soldering iron. Remove two screws marked and wires from both sides of the erase head B as shown in Figure 19, and it can be removed. (3) After finishing assembling, adjust head azimuth, heigh
31、t and tilt angle. Apply screw-lock after adjustment. Replacement of Belt and Flywheel (1) Remove screw marked and the motor bracket, two belts and the flywheel can be remov- ed as shown in Figure 20. (2) After replacing the belt and flywheel, clean them with isopropyl alcohol. (3) After finishing as
32、sembling, confirm tape speed and wow/flutter with test tape (MTT-111). Motor Bracket Flywheel Main Belt Sub Belt D , Figure 20 -13- Cassette Door Bracket Erase Head * R/P Head 7_ _(B_) _(1_ _-+-(A_)_ Head P.C.Board BLK AL-80 Figure 18 Figure 19 . Replacement of Motor ( 1) Remove a screw marked as sh
33、own in Figure 20 and two screws marked * and two wires (white, white/red) from motor side as shown in Figure 21, and the motor can be removed. (2) After finishing assembling, confirm tape speed and wow/flutter with test tape (MTT-111). Replacement of Pinch Roller ( 1) Remove a washer to take off pin
34、ch roller assembly from the cassette deck as shown in Figure 22. White Figure 21 Washer (2) After replacing the pinch roller, clean it with iso- propyl alcohol. (3) After finishing assembling, confirm tape speed and wow/flutter with test tape (MTT-111 ). Pinch Roller Figure 22 Trouble Shooting Guide
35、 Symptom Possible Cause Remedy No power. 1. Defective power switch (S101 ). 1. Replace switch. 2. Disconnected Fuse (F101 v 103). 2. Replace fuse. (For multi-voltage model only). 3. Defective DC supply block. 3. Check and repair DC power. 4. Defective power connections. 4. Check and repair wiring. C
36、apstan shaft does not rotate. 1. Main belt out of place or its discon-1. Re install or replace main belt. nection. 2. Defective motor. 2. Replace motor. 3. Burning of flywheel shaft. 3. Lubricate or replace flywheel shalt. -14 - Symptom Head base does not go up. Cassette tape does not run. (No takin
37、g up operation). Possible Cause 1. Defective play solenoid (SL 1 ). 2. Defective control circuit. 3. Deformation of spring plate. 4. Deformation of assist base stopper. More than 90 87 to 90 1. Sub belt out of place or its discon- nection. 2. Slippage of play idler. 3. Defective take-up reel. Play I
38、dler -15- AL-80 Remedies 1. Replace play solenoid. 2. Check and repair. 3. Modify spring plate. Solenoid 4. Modify the angle of bending part of assist base stopper. Bending Part / Assist Base 1. Reinstall or replace sub belt. 2. Clean play idler. 3. Replace take-up reel. - Symptom FF/REW does not fu
39、nction. Excessive wow/flutter. Photo sensor mismoves during PLAY FF or REW mode. Possible Cause 1. Defective FF (SL3)/REW (SL2) solenoids. 2. Defective control circuit. 1. Defective flywheel assembly. 2. Defective motor. 3. Defective drive belt. 4. Defective pinch roller assembly. 5. Slippage betwee
40、n tape and pinch roller. 6. Swing of center clutch. 7. Swing of back tension. 1. Misdirection of radiational and receptional elements (01, D1). 2. Defective elements (01, D1). -16- Remedies 1. Replace them. 2. Check and repair. 1. 2. 3. 4. 5. 6. 7. Replace flywheel assembly. Replace motor. Replace d
41、rive belt. Replace pinch roller assembly. Clean pinch roller. Replace center clutch. Modify back tension spring and apply grease on the spring plate. Apply grease here Spring plate Chassis ! t 1. Fix radiational and receptional elements on the best suitable position. 2. Exchange elements. ./ P C Boa
42、rd . _,/ -. ,.-/ ;:,/ Element Symptom Possible Cause Remedies Photo sensor (electric counter) 1. Defective brake on reel plate. 1. Replace brake. Overruns. 2. Brake arm does not slide smoothly. 2. Apply grease. 3. Foreign substance is adhered to brake. 3. Take off foreign substance. Playback does no
43、t function. 1. Dirty recording/playback head. 1. Clean head. 2. Defective recording/playback head. 2. Replace head. 3. Disconnected wire between recording/ 3. Check wiring and repair. playback head and playback amplifier. 4. Defective playback level adjust-4. Readjust or replace volumes. ment volume
44、s (VR251, 252,351, 352) or their slippage. 5. Defective playback amplifier. 5. Repair or replace. 6. Defective Dolby circuit. 6. Repair or replace. 7. Defective contact of monitor switch 7. Repair or replace. (S802) or its defect. 8. Defective skewing amplifier. 8. Repair or replace. 9. Defective mu
45、ting circuit. 9. Repair or replace. 10. Defective output level 10. Replace volume. volume (VR403). 11. Defective contact of I ine-out 11. Repair or replace. jack of its defect. Erasing does not function. 1. Defective rec. inh. switch (S2). 1 . Replace switch. (No signal input) 2. Removal of safety t
46、abs of cassette 2. Fix tabs. tape. 3. Dirty erase head. 3. Clean head. 4. Defective erase head. 4. Replace head. 5. Wire disconnection to erase head. 5. Check wiring and repair. 6. Defective bias OSC. 6. Check and repair. 7. Defective bias OSC trans. 7. Replace trans. Recording does not function. 1. Defective contact of line-in 1. Repair or
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