Kenwood RXD 751 W Service Manual

Page 1

RXDE501~751(K)COVER(98t4t23le42 y [w 2 if

MINI HiFi COMPONENT SYSTEM

RXD-501/501E/501W/551/551E/551W/5718/A5/ KENWOOD
701/701 E/701W/751/751E/751W/7718/A8

SERVICE MANUAL
(XD-501~A8)**

© 1998-3/351-5420-00 (K/K) 3661

L

From glass Lighting board
(810-) (B19-1589-04)

Lighting board
(B19-1586-04) (A60-)

MINI in cnmzm 5mm

Phone jack 1 I
O (E11-0169-05) lK-l w @ (EON
Cassette lid (L)

5.5 (m

(A53-)

Front glass
(310-2445-13)

AUTO REVERSE

Amy

AUTO REVERSE

Lighting board
(B19-1587-03)

a

KENWOOD

"Refer to page 2 if you want to know system configuration.

Panel assy

Knob
(K29-)

Phone jack
(E11-0280-05)

Cassette lid (RV
(A53-)

From glass
(310-2447-13)

Panel (CD)
(A29-)

* Refer to parts list on page 58.

In compliance with Federal Regulations, following are reproduc-
tions of labels on, or inside the product relating to laser product
safety.

Refer to RXD-500/700 (851-5300-00), If you require

KENWOOD-Cropt certifies this equipment conforms to DHHS
Regulations No. 21 DFR 1040. 10, Chapter 1, Subchapter J.

DANGER : Laser radiation when open and interlock defeated.
AVOID DIRECT EXPOSURE TO BEAM

TUNER preset frequency in detail.

Page 12

RXD 501~ /51(K)COVER(98. 4. 2321: 43 y [IN 23

RXD- 501/551/571/A5/701/751/77I/A8

CIRCUIT DESCRIPTION

6. Input expander IC (parallel-serial)

- X28, ICG (TC74HC166AP)

Pin No. Name I/O Description
1 - | +5V
2 - | N. C.
3 DPSS | DECK DPSS DETECTION H = MUSIC L = NO MUSIC
4 A-PLAY | A DECK PLAY SW H = NOT PLAY L = PLAY
5 A-PACK | A DECK PACK DETECTION H = PACK OUT L = PACK IN
6 - | GND
7 CD CLK | CD CLOCK INPUT
8 GND | GND
9 - | + 5V
1O B-PACK | B DECK PACK DETECTION H = PACK OUT L = PACK IN
11 B-PLAY | B DECK PLAY SW H = NOT PLAY L = PLAY
12 R REC | REVERSE REC DETECTION H = REC PROHIBITION L = REC PERMITTED
13 PS IN | PS IN
14 F REC | FORWARD REC DETECTION H = REC PROHIBITION L = REC PERMITTED
15 PS LOAD | PS LOAD
16 Vcc | +5V
7. Key matrix

FL driver u-COM (uPD780204-038)

- X14, IC1
VOLTAGE (V) ADO (33pin) AD1 (32pm) AD2 (31pin) AD3 (30pin)
0 ~ 0.82 POWER EX. BASS CD PGM TUNING UP
0.84 ~ 1.64 - - DUBBING TUNING DOWN
1. 66 ~ 2. 52 - DISPLAY SRS BAND
2. 54 ~ 3. 38 - INPUT SOUND AUTO
3.40 ~ 4.18 - MODE / DEMO SET ENTER
4.20 ~ 4. 78 - TIMER - -
VOLTAGE (V) AD4 (29pin) AD5 (28pin) ADS (27pin)
0 ~0. 82 CDKd A/B DOLBY NR
0.84 ~ 1.64 CD >>I TAPE » REV MODE
1.66~2. 52 CD. TAPE> DISCI
2. 54 ~ 3. 38 CD VIII TAPE l DISC SKIP
3.40~4. 18 CD2 TAPE 4 DISC2
4.20 ~ 4. 78 TAPE 0 TAPE « DISC 3
12

Page 18

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PC BOARD(Component side view) CASSETTE MECHANISM UNIT
CD MECHANISM UNIT X32-359X-XX X28-2960-10

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19 20 Refer to the schematic diagram for the value of resistors and capacitors.