Pioneer CT-70R Service Manual

VY) PIONEER’
Setvice
PAZETTET
REPAIR & ADJUSTMENTS
ORDER NO.
ARP- 260-0
STEREO CASSETTE TAPE DECK
Cir- 7OR
MODEL CT-70R COMES IN SEVEN VERSIONS DISTINGUISHED AS FOLLOWS:
~T Whom; . |
Type Voltage Remarks
KU AC120V only U.S.A. model
__|
KC AC120V only Canada model
+
HE AC220V, 240V (switchable) European continent model
HB AC220V, 240V (switchable) United Kingdom model
AC220V, 240V (switchable) Australia model
AC120V, 220V, 240V (switchable) General export model
AC120V, 220V, 240V (switchable) U.S. Military model
This service manual is applicable to the KU type. For servicing of the other types, please refer to pp.
66~76.
For the circuit and mechanism descriptions, please refer to the CT-90R service manual (ARP-364-0).
Ce manuel d’instruction se refére au mode de reglage, en francais.
Este manual de servicio trata del método de ajuste escrito en espajiol.
CONTENTS
1. SPECIFICATIONS ......0.0. 050055 085 ea% 3 9. ELECTRICAL PARTS LIST .............. 33
2. FRONT PANEL FACILITIES ............. 4 10. ADJUSTMENTS .......... 0.0.0. cee eee 38
3. DISASSEMBLY ............. 00.0 00000- 8 REGU AGE soc skeek eae ok seek Cav awe 47
4. PARTS LOCATION ................004. 10 ASUSTEES 2.3 Gace a Periebdetesabs achudee o alierccd SBE S 56
5S, ‘EXPLODED VIEW: s 2 pg gees gee gine ams 12 11. SUPPLEMENT FOR HE, HBANDHPTYPES .. 66
6: PACKING «5 esea dead cedaarevss dee ews 18 12. SUPPLEMENT FOR KC TYPE ............ 71
7. P.C. BOARDS CONNECTION DIAGRAM ..... 20 13. SUPPLEMENT FOR D AND D/G TYPES .... 72
8. SCHEMATIC DIAGRAM ................ 27
PIONEER ELECTRONIC CORPORATION 3-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS (USA) INC. 1925 E. Dominquez St., Long Beach, California 90810 U.S.A.
PIONEER ELECTRONIC [EUROPE] N.V. Keetbergiaan 1,2740 Beveren, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia
YH © MAY 1983 Printed in Japan
an

Pioneer CT-70R Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	4.8 cm/s
Heads	1 x record, 1 x playback, 1 x erase
Total Harmonic Distortion	0.8%
Type	Stereo Cassette Deck
Tape Type	Type I, Type II, Type IV
Noise Reduction	B, C
Frequency Response	20Hz - 20kHz (Metal tape)
Dimensions	420 x 120 x 300mm

Summary

SAFETY INFORMATION

Safety Precautions

General safety checks and leakage current measurement.

Product Safety Notice

Highlights special safety characteristics of replacement parts.

SPECIFICATIONS

Technical Specifications

Details performance metrics like frequency response, wow/flutter, S/N.

Miscellaneous and Furnished Parts

Covers power, dimensions, weight, and included accessories.

FRONT PANEL FACILITIES

Main Controls

Power, Timer, Eject, Direction, Counter, Reset controls.

Playback, Recording, and Muting Controls

Memory, Play, Rew, FF, Stop, Pause, Record, Mute controls.

Indicators and Special Functions

Dolby NR, Music Search/Skip, Music Repeat, Blank Search functions.

Tape Type and Mode Selection

Dolby B/C, Tape Indicators, Mode, MPX Filter selections.

DISASSEMBLY

External Component Removal

Bonnet case, front panel, and bottom plate removal steps.

Internal Component Removal

Tape transport, head assembly, and capstan belt removal.

PARTS LOCATION

Front Panel Parts Identification

Locates parts on the front panel view.

Internal Component Location

Locates internal parts from the top view.

EXPLODED VIEW

P.C.BOARDS CONNECTION DIAGRAM

Circuit Board Interconnections

Diagram showing connections between different circuit boards.

SCHEMATIC DIAGRAM

Overall Circuit Diagram

Provides the complete electronic schematic for the unit.

ELECTRICAL PARTS LIST

Component Parts Lists

Lists miscellaneous, fuses, capacitors, resistors, semiconductors.

Sub-assembly Parts Lists

Lists parts for specific assemblies like Dolby NR, Control.

ADJUSTMENTS

Mechanical Adjustments

Covers pinch roller, head azimuth, tape transport, speed, torque, and door.

Playback Adjustments

Covers Head Azimuth, Tape Transport, Playback EQ, and Playback Level.

Erase Current Adjustment

Details the erase current adjustment procedure.

Recording Level Adjustment

Covers Recording Level, Meter OdB Check, Leader Tape Detector.

SUPPLEMENT FOR HE, HB AND HP TYPES

Contrast of Miscellaneous Parts

Lists parts differing from KU type for HE, HB, HP models.

SUPPLEMENT FOR KC TYPE

Contrast of Miscellaneous Parts

Lists parts differing from KU type for KC model.

SUPPLEMENT FOR D AND D/G TYPES

Contrast of Miscellaneous Parts

Lists parts differing from KU type for D/D/G models.