Kenwood KRA 4050 Service Manual

Page 2

KR-A4050/5050
CONTENTS

REMOTE CONTROL OPERATION ......................... 4 BLOCK DIAGRAM ................................................... 41
DISASSEMBLY FOR REPAIR CIRCUIT DESCRIPTION 43

BLOCK DIAGLAM ADJUSTMENT ....... 53
CIRCUIT DESCRIPTION .. REGLAGE ............. 54
ADJUSTMENT ..... ABGLEICH .............................................. 55
REGLAGE ADJUSTMENT/REGLAGE/ABGLEICH ..... 56
ABGLEICH .............................................................. 14 WIRING DIAGRAM ................................................. 57

WIRING DIAGRAM ............................
PC BOARD (Component side view) .
SCHEMATIC DIAGRAM ...........................

PC BOAD (Component Side View) ,,
SCHEMATIC DIAGRAM ..................
EXPLODED VIEW (UNIT) ,.

59
.. 63
75

EXPLODED VIEW (UNIT) PARTS LIST 77
PARTS LIST ........................ SPECIFICATIONS (K, P Iype) I. 81
CONTROL & INDICATORS ........ SPECIFICATIONS (E type) UBACK COVER
DISASSEMBCY FOR REPAIR ACCESSORIES ,,,,, BACK COVER
(KR4A4050 E. Type)

Metallic cabinet Front glass Front panel Knob

IAOIGOJSIAOBI IBIDvZODS-OSI (ABC-051708) IK27-2IO7-08I

KENWOCICI "" "

n74 u.

Phone jack Knob Knob Knob Knob
IE1 1-022308) (K294413508) (K27A2110~08l (K29-2111-08) «294444-03
Terminal board Lock terminal board AC coyd' AC cord bushing Ac outlet

(J42-0199-08)

IE7O-0023A08) IE70~OOO4-08I (E30-I (ED3-I

Phono iack Phono jack Phono IBCk Slide switch Miniature phone jack Foot
IE13-024905) {BUS-063305) (151343445435) X 2 [552-0032-08) (E11A0188-05) IJOZIOBQ-Oa

2 Refer m parts list on page 77-

Page 9

2) Destination set SW: E type/K type IDSOS to 0903)

KR-A4050/5050

CIRCUIT DESCRIPTION (Except E, r We,

3) Specification set SW: AM1700k/AM 1610k (D924)

Destination Desti- BAND Reception Channel Reference WI") destinatlon set SW at 0 1 Effective °an 0' K me
set SW nation frequency band space frequency specifigcson AM reception frequency band
FM a7.5~1oa.o MHz 100 kHz 50 kHz 53 530 1510 m
0 K AM 5304610 kHz 10 kHz l0 kHz 0 _ 2
5304700 kHz 1 530-1700 kHz
1 E FM B7.5~108.0 MHZ 50 kHz 50 kHz
AM 531-1602 kHz 9 kHz 9 kHz
Pin description
Pin No. Pin nnrno I/O Name Function
1 PW 0 VRDOWN Potentiometer down operation control. High: V down
Low: Normal state
2 PVZ l BACKUP Backup (AC outlet om detection. High: Normal state
Low: AC outlet off
When the power IS switched on, high is input.
When low is input, the microprocessor stops clock generation and enters the backup state.
When the signal changes from low to high. the backup state changes to the normal state.
3 RMC l REMOCON REMOCON signal inpm. active Law
4~11 FXO-PX3 | KRO-KR? KEY RETURN signal input. High There is input.
pDo_pD3 Low: There is no input.
l2~16 PCO~PC3 0 KSo-KSA KEY SCAN signal output. Normally high is output
PFC Key scan is periorrned when KEY is ON.
17 PH 0 SMUTE SURROUND efiect audio signal output ONIOFF control. High: output ON
Low: output OFF
18 PF2 O VOLLED Volume LED Slgnal output. High: OFF
Low. ON
19 PFEl O SELST Data latch signal output to TCSlSZ/TCBi 64.
Data is latched on the new edge
20 PEG 0 DATA LM700liPLL IC) TC9162/T69164 (selector IC) control serial data output.
Data is latched on the rising edge of the clock.
21 PE1 O CLOCK LM7001, TC9162/TC9164 control serial data transler shilt clock output. Data is latched on the rising edge
of the clock.
22 FEZ O PLLLT CE signal output to LM7001 When the Signal is high, LM7001 is enabled.
23 PE3 0 VIDEO 172 VIDEO signal switching control. High: VIDEO 2
Low: VIDEO 1
24 P50 0 POWER Power supply circuit relay on/cff control. High: ON
Low: OFF
25 FBI 0 MUTE 1 TAPE 2 REC OUT mute control. High. MUTE OFF
Low: MUTE ON
26 P82 0 MUTE 2 LINE OUT mute control. High: MUTE OFF
Low: MUTE ON
27 F53 O CDDL CD DlRECT LED slgnal output. High:OFF
LCM/ION
23 FAQ l 5 Tuner tuned detection. High: N0 SIGNAL
Low: TUNED
29 PA! l STEREO Tuner FM stereo detection. High: MONO
Law: Stereo
30 PA2 |/o SDATA This pin and serial data pin 59 are shorted.
31 PAS I/O BUSY Serial busy signal input/output.
32 V55 - GND GND.
33-48 SO~Sl 5 O Sa-So, Sr Fluorescent display segment drive signal output.
49~51 T7-T5 O - NO.
52-56 T4~T0 0 G5-Gi Fluorescent display digit drive signal output.
57 V, - V, Fluorescent display output driver circuit power supply.
56 lNT2 l - Unused pin. This pin and GND are shorted.
$9 lNTl I SDATA This pin and serial data input pin 30 are shorted.
60 XTAL O XTAL Clock generation circuit output.
51 EXTAL | EXTAL Clock generation circuit input.
82 EST I RESET Reset signal input.
63 We 0 VRUP Volume up operation control. High: UP
Low Normal state
64 VW _ Vpo +5 V power supply.

11

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Page 46

PC BOARD (Component side view)

VIDEO 2 VIDEOI TAPE 2 TAPE | CD
gm glam? r-. r-'
PLAY PLAY REC PLAY REC

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T2A L 250V (6050) 2

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F2 72.5A L 250V (

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62 Refer to the schematic diagram for the vatuas of resistors and capacitors.