Pioneer ctf 850 service manual

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MODEL CT-F850 COMES IN SIX VERSIONS DISTINGUISHED AS FOLLOWS:

Typo Voltag- Rmarks
KU AC 120V only USA. model

KC AC 120V only Canada model

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

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

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

D/G AC 120V, 220V and 240V (Switchable) US. military model

o This service manual is applicable to the CT-F850/KU, KC. For servicing of the other types,

please refer to the additional service manuals.

CONTENTS

1. SPECIFICATIONS ..................... 3
2. FRONT PANEL FACILITIES .............. 4
3. LEVEL DIAGRAM ..................... 6
4. DISASSEMBLY ....................... 8
5. PARTS LOCATION .................... 11
6. BLOCK DIAGRAM .................... 13
7. CIRCUIT DESCRIPTIONS
7.1 Recording and playback circuit ........ 15
7.2 Tape selector and equalizer ........... 15
7.3 Level meters circuit ................ 16
7.4 Dolby NR circuit ................. 17
7.5 Control circuits .................. 18
7.6 Muting circuits ................... 20
8. MECHANICAL ADJUSTMENTS
8.1 Pinch roller pressure adjustment ....... 25
8.2 Tape speed adjustment ............. 25
8.3 Tape guide adjustment .............. 25
9. ELECTRICAL ADJUSTMENT
9.1 Head azimuth adjustment ............ 26
9.2 Playback equalizer adjustment ........ 27
9.3 Playback level adjustment ........... 27
9.4 Level meter adjustment ............. 27
9.5 Bias trap adjustment ............... 27
9.6 Erasure current adjustment ........... 27
9.7 Bias adjustment .................. 28

10.

11.

12.

9.8 Recording frequency response ......... 28
9.9 Recording level adjustment ........... 29
9.10 Recording Dolby NR level adjustment. . . . 30
9.11 Playback Dolby NR level adjustment . . . . 30
EXPLODED VIEWS

10.1 Exterior ....................... 32
10.2 Mechanism assembly 1 .............. 35
10.3 Sub-chassis ..................... 37
10.4 Mechanism assembly 2 .............. 38

SCHEMATIC DIAGRAMS, P.C. BOARD
PATTERNS AND PARTS LIST

11.1 Miscellaneous parts list ............. 41
11.2 Connection diagram ............... 42
11.3 Schematic diaglam ................ 43
11 .4 P.C. boards connection diagram ........ 46
11 .5 Mother assemblleWX-302) .......... 49
11.6 Power supply and control assembly ..... 53
lRWR-O76)
11.7 Indicator amp assembly ............. 55
11 .8 Sensing assembly ................. 55
11.9 Indicator assembly ................ 55
11.10 Function indicator assembly .......... 56
11.11 Switch assembly .................. 56
11.12 Fuse assembly ................... 56
PACKING ........................... 57