Pioneer KEX-73 Service 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-73 Specifications

General

Brand	Pioneer
Model	KEX-73
Category	Tuner
Language	English

Summary

Handling Precautions for IC PD7004 and PD2001

Parts Location Diagram

Circuitry Overview

PD7004 Control IC Functions Overview

Overview of the PD7004 IC for PLL synthesizer tuner control and operations.

PD7004 PLL Tuner Section

Explanation of the Phase-Locked Loop tuner operation for FM and AM reception.

PD7004 IC Specifications

PD7004 AM Tuner Section (KEX-70)

PD7004 MW/LW Tuner Section (KEX-73)

Block Diagram KEX-70

KEX-70 Block Diagram Details

KEX-73 Block Diagram Details

Adjustment Procedures

Crystal Oscillator Frequency Adjustment

Procedure for adjusting the crystal oscillator frequency for accurate tuning.

FM IF Alignment

Steps for aligning the Intermediate Frequency stages of the FM tuner.

FM Tracking Adjustment

Procedure for adjusting the FM tuner tracking for accurate reception across frequencies.

FM MPX (Multiplex) Adjustment

Procedure for adjusting the FM stereo multiplex separation.

FM ARC (Automatic Reception Control) Adjustment

Procedure for adjusting the FM ARC function for optimal signal reception.

FM Scan/Seek Sensitivity Check

AM IF Alignment (KEX-70)

Procedure for aligning the Intermediate Frequency stages of the AM tuner for KEX-70.

AM Tracking Adjustment (KEX-70)

Procedure for adjusting the AM tuner tracking for accurate reception across frequencies.

MW/LW IF Alignment (KEX-73)

MW/LW Tracking Adjustment (KEX-73)

AM Scan/Seek Sensitivity Adjustment

LW Scan/Seek Sensitivity Check (KEX-73)

Dolby NR Law Adjustment

Dolby NR Level Adjustment

KEX-70 Connection Diagram

KEX-73 Connection Diagram

KEX-73 Schematic Circuit Diagram