Pioneer ctf 1250 service manual

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MODEL CT-F1250 COMES IN SIX VERSIONS DISTINGUISHED AS FOLLOWS:

Type Voltage Remarks
KU AC 120V only U.S,A. model

KC AC120V only Canada model

D AC 120V, 220V and 240V (Switchable) General export model

DIG AC 120V, 220V and 240V (Switchable) US. military model

HB AC 220V and 240V (Switchable) United Kingdom model

HE AC 220V and 240V (Switchable) Europe model

o This service manual is applicable to the CT-F1250/KU,

please refer to the additional service manuals.

CONTENTS

1. SPECIFICATIONS ............. 3
2. FRONT PANEL FACILITIES .............. 4
3. DISASSEMBLY ....................... 7
4. PARTS LOCATION .................... 10
5.LEVELDIAGRAM.....................12
6. CIRCUIT DESCRIPTIONS
6.1 Playback Circuit ................... 14
6.2 Recording Amplifier ................ 14
6.3 Dolby NR Processor Circuit ........... 16
6.4 Control Circuit ................... 17
6.5 Muting Circuit .................... 21
7. BLOCK DIAGRAM ..................... 25
8. TIMING CHART ...................... 27
9. MECHANICAL ADJUSTMENTS
9.1 Pinch Roller Pressure Adjustment ........ 32
9.2 Reel Base Torque .................. 32
9.3 Tape Guide Adjustment .............. 32
9.4 Capstan Motor Lock Range Adjustment . . . 33
9.5 Pitch Control, Center Click Position
Speed Adjustment .................. 33
10. ELECTRICAL ADJUSTMENTS
10.1 Head Angle Adjustment .............. 34
10.2 Playback Equalizer Adjustment ......... 35
10.3 Playback Level Adjustment ............ 35
10.4 Meter Adjustment .................. 36
10.5 Erase Current Adjustment ............. 36
10.6 Confirmation and Adjustment of
Bias Trap ........................ 36
10.7 Bias Adjustment ................... 36
10.8 Adjustment of Record and Playback
Frequency Response ................ 37

%

KC. For servicing of the other types,

10.9 Record Level Adjustment ............. 38
10.10 Confirmation of Tape Calibration
Adjustment ...................... 39
10.11 Adjustment of Dolby NR Recording ...... 39
10.12 Adjustment of Dolby NR Playback ....... 39
11. EXPLODED VIEWS
11.1 Exterior ........................ 42
11.2 Mechanism Assembly 1 .............. 45
-3 Mechanism Assembly 2 .............. 47
11.4 Front Panel ...................... 49
11.5 Panel Stay ....................... 50
11.6 Mother Assembly .................. 51
12. PACKING ........................... 52

13. SCHEMATIC DIAGRAMS, P.C. BOARD

PATTERNS AND PARTS LIST

13.1 Miscellaneous Parts List .............. 53
13.2 Connection Diagram ................ 54
13.3 Schematic Diagram ................. 57
13.4 Control Unit (RWG-104) ............. 64
13.5 Indicator Amplifier Unit ............. 67
13.6 Indicator Unit (RWX-317) ............ 7i
13.7 BLE Unit (RWX-322) ............... 73
13.8 Mother Unit (RWX-319) .............. 77
13.9 Volume Unit ..................... 82
13.10 Function Switch Unit (RWS-O75) ........ 83
13.11 Sensing Unit ...............

13.12 Semi-Fixed Volume Unit .............
13.13 Capstan D.D. Motor ................. 84
13.14 Power Supply Unit (RWR-074) ......... 87
13.15 Fuse Assembly .................... 9i