Tascam 112 service manual

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TASCAM

TEAC Professional Division

SERVICE MANUAL

Stereo Cassette Deck
M

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II

Schematlcs

- insert

TABLE OF CONTENTS
E 352

1' Specificafions 1_ lilfi ............................................. 2
Block Diagram -- ' 7537 '74?J5A

2. Removal of External Components 2. fifiéfigfiamfib'fi

3' Parts Locafion 3. fifififil .........................

4. Test Equipment/Material and Precautions 4. JJi'flyligfifiéigfifii
4-1 Equipment Required for Maintenance -~--7 4-1.}l V91- Uzifiéfifi
4-2 Precautions ......................... 7 4.2. ,e y;7-y15g§r¢

5. Mechanical Checks and Adjustments 5. flfifi$F1w7éz§Ffi§
5-1 ACapsxan Assembly Thrust ------------- 11 5-1. *rjxfivAs-syzfix b
5-2 Micro Switch ------------ 11 5-2. 740 D 24' vi: """""""
5-3 Head Base Position .. 11 5-3. «a Fr<~xlflfi --------------
5-4 Pinch Roller Pressure -- 14 5-4. EV? '7 D~5Ef§jj
5-5 Reel Torque ------ ,. 14 5-5JJ-1b - HBO
5-6 Tape Speed ---------- 15 5-6. F-D'SEE
5-7 WOW and Flutter """"""" 16 5-7. '79 ' 75y?
5-8 Casselte Holder 18 5-8. fifty i ' 7kllz5

5-9 Damper Adjustment 17 5-9. 5792mm
1 5-10 Lubrication .......... .. 17 5-10 53$ ....................................

5-11 Voltage Conversion 17 6. fififi$7 77115033" 1 w 7 tree

6. Electrical Checks and Adjustments 6-1.§$§E
6-1 Playback Performance 19 6-2. Ezfifi
6-2 Monitor Performance ~ 21 6-8. $335797:
6-3 Recording Performance ~- 21 7A Eliéikflfl

7. Circuit Description 7"1. 35- lfilififllfilizfi ------------------------- 24
7- -1 Mode Control Circuit -' 24 7-1-1. 915Lxfillifillc (U-501) ~ 24
7-1-1 System Control 1C (U501) 24 7~1-2.fi$$llfil@§§ ------ ,. 27
7- 1- -2 Playback Control Circuit 27 7-1-3.§§%i§l1fi1l§li§ ----- 28
7- 1- 3 Record Control Circuit 28 7-1-4. Fffilifilfilflfi -- 29
7- 1- -4 FF Control Clrcuh " 29 7-1-5. REW filifilfilflé ' 29
7- 1- 5 REW Control Circuit 29 7-1-6. PAUSE %- Ffillfillflfifi H 31
7- 1- -6 PAUSE Mode Control Circuit """"" 31 7-1-7. CUE¥-- Ffilliifllfilifi '
7- 1- -7 CUE Mode Comrol Circuir - . 31 7-1-8. 71¢79~EJE€
7 1- 8 Counter Circuit -------- ~32 7-1-9.7-7IJF-Rl~-p7@&§
7- 1 9 Tape end Stop Circuit - 33 7-1-10.ED U 5~71§lfl§ -----------
7- 1- 10 Zero Return Circuit --------- 33 7-1~11.'\'9-7.r/~E;--H§]i§
7- 1- 11 Power ON/MUTE Circuit -------- 34 7-2. 797l§li§ ---------
7... 2 Amplifier Circuit ........................ 35 7-2Lfiifilfi ......... 3b
7- -~2 1 Playback Circuit 36 7- 2- 2 fififilfi-fi
7- 2- 2 Record Circuit ----- -- 37 8. fifilZléIT-y - 'JX l

B. Exploded View: and Parts Llsts n 40 9. §lfil§léll~J ~ U1 l

9. PC Boards and Parts List: .. 50 10.1C7D «15- '9'417713

10. IC internal Block Diagrams -- 57 @3fil321