Pioneer KEX-70 User Manual

The photo shows the model KEX-73
) PIONEER
ORDER NO.
CRT - 254-0
CASSETTE CAR STEREO WITH AM/FM ELECTRONIC TUNER
KEX=-70
.
CASSETTE
CAR
STEREO
WITH
LW/MW/FM
ELECTRONIC
TUNER
SPECIFICATIONS
General
Power source.......... DC14.4V (10.8 ~ 15.6V allowable)
Grounding system ......... 000 cece ee eee Negative type
Dimensions (chassis)......... 180(W) x 50(H) x 150(D) mm
(Front face)........ 184(W) x 56(H) x 31(D) mm
WIG a 5:6 ores owed Selma i ewe Waid sR ehis a eva ee 2.0kg
Tone controls (bass) ......... 00.00 ce eee +10 dB (100 Hz)
(treble) ...............005 + 10dB (10 kHz)
Loudness contour........ +12 dB (100 Hz), +4 dB (10kHz)
(volume: —30 dB)
Maximum outputlevel ........... 0.0.0 .c cea eaee 200 mV
Output impedance. ......... 0... cc cece eee eae 1kQ
Tape player
WAPGy
he
ee
var
eele
wees
Compact
cassette
tape
(C-30
~
C-90)
Tape speed .... 0... cece ee eee eee one 4.76 cm/sec.
(+ 0.19 cm/sec. -0.05 cm/sec.)
Fast forward/rewind time ......... Within 120 sec. for C-60
Wow & flutter............. No more than 0.09% (WRMS)
Frequency response...... 30 ~ 20,000 Hz (+3 dB) (at meta!)
30 ~ 16,000 Hz (+3 dB) (at normal)
Stereo separation............. 000 c eee More than 40 dB
Signal-to-noise ratio ........ Dolby NR IN: More than 63 dB
(IEC-A network)
Dolby NR OUT: More than 55 dB
(IEC-A network)
KEX=73
.
FM tuner
Frequency range. ....... 2. cece ee ees 87.5 ~ 108 MHz
Usable sensitivity ............. 12 dBf (1.14V/752, mono)
50 dB quieting sensitivity ....... 17 dBf (1.94V/75Q, mono)
Alternate channel selectivity............ 70 dB (+400 kHz)
Distortion ...............- 0.3% (at 65 dBf, 1kHz, stereo)
Frequency response.............. 30 ~ 15,000 Hz (+3 dB)
Stereo separation .............0.0. 40 dB (at 65 dBf, 1kHz)
AM (MW) tuner
Frequency range ........2 cece cece aee 531 ~ 1,602 kHz)
Usable sensitivity ...... 18uV (25 dB) (S/N: 20 dB) (KEX-70)
Usable sensitivity. ... . 30yV (29.5 dB) (S/N: 20 dB) (KEX-73)
Selectivity. ........ cc ccc cece ee eee 50 dB (+9 kHz)
LW tuner (KEX-73)
Frequency range ..........0e cece eee 153 ~ 281 kHz
Usable sensitivity ............. 70uV (37 dB) (S/N: 20 dB)
SEC. i wie ier mcmesiaawianearass 50 dB (+9 kHz)
Note:
Specifications and the design are subject to possible
modification without notice due to improvements.
¢ ‘Dolby’ and the double-D symbol are trademarks of Dolby Laboratories Licensing
corporation.
¢ Noise Reduction System manufactured under license from Dolby Laboratories
Licensing Corporation.
eee
PIONEER ELECTRONIC CORPORATION 4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
PIONEER ELECTRONICS OF AMERICA 1925 €, Dominguez St. Long Beach; Calif. 30810
PIONEER ELECTRONIC (EUROPE) N.V. Luithagen-Haven 9, 2030 Antwerp, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Austrailia
E K © APR. 1981 Printed in Japan

Pioneer KEX-70 Specifications

General

Brand	Pioneer
Model	KEX-70
Category	Tuner
Language	English

Summary

SPECIFICATIONS

General

General specifications for the cassette car stereo.

FM tuner

Technical specifications for the FM tuning section.

AM (MW) tuner

Technical specifications for the AM/MW tuning section.

LW tuner (KEX-73)

Technical specifications for the LW tuning section.

PARTS LOCATION

CIRCUIT DESCRIPTION

TAPE SECTION

Details about the tape playback section, including Dolby NR.

Dolby NR Circuit

Explanation of the Dolby Noise Reduction system functions.

Equalizer Amplifier

Description of the equalizer amplifier circuit and its functions.

MUTING CIRCUIT

Description of the muting circuit operations.

DESCRIPTION OF DECK CONTROL

Explanation of the deck control functions, including IC PD2001.

FUNCTIONS OF PD7004 CONTROL IC

Details on the functions of the PD7004 control IC for PLL tuners.

PLL Section

Explanation of the phase-locked loop section for tuner control.

PD7004 Specifications

Detailed specifications for the PD7004 control IC.

Charge Pump and Loop Filter

Description of the charge pump and loop filter circuit in the PLL system.

Display Control Section

Explanation of the dynamic lighting system for the display control.

Switch Matrix

Description of the switch matrix controlled by PD7004.

Scan Operation

Details on how the scan operation is performed.

DC-DC Converter

Description of the DC-DC converter circuit for stable tuning voltage.

PNS and MPX Decoder

Explanation of the FM noise canceler and MPX decoder ICs.

AM Tuner (KEX-70)

Description of the AM tuner section for the KEX-70 model.

MW/LW Tuner Section (KEX-73)

Description of the MW/LW tuner section for the KEX-73 model.

LW Circuitry (KEX-73)

Details on the LW circuitry specific to the KEX-73 model.

BLOCK DIAGRAM

KEX-70

Block diagram illustrating the KEX-70 system architecture.

KEX-73

Block diagram illustrating the KEX-73 system architecture.

ADJUSTMENT

CRYSTAL OSC FREQUENCY ADJUSTMENT

Procedure for adjusting the crystal oscillator frequency.

FM IF ADJUSTMENT

Procedure for adjusting the FM Intermediate Frequency (IF) stage.

FM TRACKING ADJUSTMENT

Procedure for adjusting FM tracking across the frequency band.

FM MPX ADJUSTMENT

Procedure for adjusting the FM Multiplex (MPX) separation.

FM ARC ADJUSTMENT

Procedure for adjusting the FM Automatic Reception Control (ARC).

FM SCAN (SEEK) SENSITIVITY CHECK

Procedure to check FM scan/seek sensitivity.

AM IF ADJUSTMENT (KEX-70)

Procedure for adjusting the AM Intermediate Frequency (IF) for KEX-70.

AM TRACKING ADJUSTMENT (KEX-70)

Procedure for adjusting AM tracking across the frequency band.

MW/LW IF ADJUSTMENT (KEX-73)

Procedure for adjusting MW/LW Intermediate Frequency (IF) for KEX-73.

MW/LW TRACKING (KEX-73)

Procedure for adjusting MW/LW tracking across the frequency band.

AM (MW) SCAN (SEEK) SENSITIVITY ADJUSTMENT

Procedure to check AM/MW scan/seek sensitivity.

LW SCAN (SEEK) SENSITIVITY CHECK (KEX-73)

Procedure to check LW scan/seek sensitivity.

DOLBY NR LAW ADJUSTMENT

Procedure for adjusting the Dolby NR playback level law.

DOLBY NR LEVEL ADJUSTMENT

Procedure for adjusting the Dolby NR playback level.

CONNECTION DIAGRAM (KEX-70)

SCHEMATIC CIRCUIT DIAGRAM (KEX-70)

CABINET EXPLODED VIEW

CHASSIS EXPLODED VIEW

PACKING METHOD

ELECTRICAL PARTS LIST

FM Front End Unit (CWB-079)

Electrical parts list for the FM Front End Unit.

FE IF UNIT (CWE-421)

Electrical parts list for the FE IF Unit.

Tuner Control Unit (CWM-070) (KEX-70)

Electrical parts list for the KEX-70 Tuner Control Unit.

Amp Unit (CWK-238)

Electrical parts list for the Amp Unit.

Tuner Control Unit (CWM-073) (KEX-73)

Electrical parts list for the KEX-73 Tuner Control Unit.

Sensing P.W. Board

Electrical parts list for the Sensing P.W. Board.

Switch Unit

Electrical parts list for the Switch Unit.