Hitachi DIGITAL RECEIVER KHWS1W - KHWS1WUN - How to disassemble – Circuit Diagram

Used ICs: TA7358AP – TA8132AF – TC9327F-200 – BA4501F – BU4066BC – TA7368P – TA8126F – DRD3515A – PCF8574AT – MM1385P – MM1385H – HD6432128F A20 – 24LC194 – MAS3506D

FM/MW/SW1/SW2 4-bands Superheterodyne
FM: 87.5 - 108 MHz
MW: 522 - 1620 kHz (9 kHz steps)  520 - 1620 kHz (10 kHz steps)
SW1:2.300-7.300 MHz
Meter band: 120, 90, 75, 60,49, 41 m
SW2:9.500-26.100 MHz
Meter band: 31, 25, 21, 19, 16,13, 11 m
FM/SW1/SW2: Telescopic antenna (aerial)
MW: Built-in ferrite-core antenna (aerial)

Disassemble Procedure

Removal of Back Case 

(1) Remove 3 screws 1 from the back and 2 screws 2 inside the battery compartment.

(2) Detach the Antenna.

(3) Detach the connector A.

Removal of SATELLITE P.W.B. Board)

(1) Detach all connectors B, C and D.

(2) Remove 1 screw 3 from the Satellite P.W.B. Board.

(3) Remove 2 screws 4 from the Satellite P.W.B. Board.

(4) Release the 3 catches and slide the Satellite P.W.B. Board away.

Removal of TUNER P.W.B. Board
(1) Detach 5 connectors E, F, G, H and I from the Tuner P.W.B. Board.
(2) Turn to the opposite side, remove 1 screw 5 from the Tuner P.W.B. Board.
(3) Detach 9 catches and separate the Tuner P.W.B. Board from the sub-chassis.

Removal of Insulator Pad (Fig. 4)
(1) Remove 6 screws 5 from the Insulator pad.

Removal of Main Board.

(1) Remove 4 screws 6 from the Main Board.

Removal of Speaker.

(1) Release one end of the metal pin that secures the speaker position.

(2) Slide out the speaker.

Removal of POWER SUPPLY P.W.B. Board.

(1) Remove 4 screws 7 and detach 1 connector J from the Power Supply P.W.B. board.

Removal of ANTENNA P.W.B. Board

(1) Remove 1 screw 9 from the Antenna P.W.B. board.

(2) Gently pull the Antenna P.W.B. board outwards.

Removal of WS ANTENNA SUPPORT PLATE.

(1) Remove the 6 screws 8 and pull the WS Antenna Support Plate away from the Back case.

Wiring Diagram

Circuit diagram (Schematic)

Click on the pictures to magnify