Hitachi KHWS 1 WUN Service Manual
This is the 42 pages manual for Hitachi KHWS 1 WUN Service Manual.
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Extracted text from Hitachi KHWS 1 WUN Service Manual (Ocr-read)
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KH-WS1 – 2 – SAFETY PRECAUTIONS The following precautions should be observed when servicing. 1. Since many parts in the unit have special safety-related characteristics, always use genuine Hitachis replacement parts. Especially critical parts in the power circuit block should not be replaced with other makers. Critical parts are marked with in the circuit diagram and printed wiring board. 2. Before returning a repaired unit to the customer, the service technician must thoroughly test the unit to ascertain that it is completely safe to operate without danger of electrical shock. SPECIFICATIONS - WS (WorldSpace digital broadcast) Section Circuit system: Digital Receiver Broadcast method: WorldStar 1 Method Receiver frequency: L-Band (1453.384-1490.644 MHz) Input/Output terminals Antenna input terminal Type/Impedance: F-type/50 Ω Polarization voltage: LHCP 2.5-2.2 V RHCP 3.3-2.8 V Max. current supply: 70 mA External terminal: 9-pin, for future expansion WS antenna (Built-in, detachable type): WorldStar 1 Method compatible antenna Gain: over 6 dBi Dimensions: 150 x 33 x 156 mm (w x h x d) - Radio Section Circuit system: FM/MW/SW1/SW2 4-bands Superheterodyne Tuning range: 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 Antennas: FM/SW1/SW2: Telescopic antenna (aerial) MW: Built-in ferrite-core antenna (aerial) - General Specifications Power supply: AC: 110-127 V/220-240 V, 50/60 Hz DC: 6 V D cell or IEC R20 or equivalent x 4 (Optional) DC input jack Input voltage : DC 6 V + 30%, –10% (DC 7.8 V – 5.4 V) Current consumption: max. 400 mA Power (mains) consumption: 5 W Audio output: 3 W (PMPO) 300 mW (DC operation, 10% THD) Speaker: 65 mm Cone/8 Ω Output/Impedance: Headphones (stereo)/ Suitable impedance: 8-100 Ω Line out (stereo)/2.2 kΩ Battery life time: 30 hours over by using alkaline (LR20) batteries. 12 hours over by using manganic (R20P) batteries. (Use HITACHI battery/Measured method: EIAJ CP-2905A) Dimensions: 240.5 x 162.5 x 64.5 mm 240.5 x 162.5 x 93 mm (w x h x d) (including the WS antenna and handle) Weight: 1.5 kg (without batteries), 1.9 kg (with batteries) - Accessories AC power cord: 1 AC plug adaptor: 1 F-type connector: 1 set (for making an extention coaxial cable) Waterproof cover: 1 Waterproof tape: 1 NOTE: * Specifications are subject to change without notice. Check that exposed parts are acceptably insulated from the supply circuit before returning the repaired instrument to the customer. - Checking method Measure the resistance value between the both poles of attachment cup (Power supply plug) and the exposed parts (Parts such as Knob, Cover, etc. where the cus- tomer is easy to touch.) and check that the resistance value is 500 kohms or more. INSTRUMENT (Exposed part) Insulation tester (DC 500V) KH/Pg 02 (Spec)10/11/00, 1:44 PM 2
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KH-WS1 – 3 – SERVICE POINTS 1. Removal of Back Case (Fig. 1) (1) Remove 3 screws 1 from the back and 2 screws 2 inside the battery compartment. (2) Detach the Antenna from the Ant }. (3) Detach the connector A. 2. Removal of SATELLITE P.W.B. Board (Fig. 2) (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. 2. Removal of TUNER P.W.B. Board (Fig. 3) (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. 3. Removal of Insulator Pad (Fig. 4) (1) Remove 6 screws 5 from the Insulator pad. 4. Removal of Main Board (Fig. 5) (1) Remove 4 screws 6 from the Main Board. 5. Removal of Speaker (Fig. 6) (1) Release one end of the metal pin that secures the speaker position. (2) Slide out the speaker. 6 . Removal of POWER SUPPLY P.W.B. Board (Fig. 7) (1) Remove 4 screws 7 and detach 1 connector J from the Power Supply P.W.B. board. 7 . Removal of ANTENNA P.W.B. Board (Fig. 7) (1) Remove 1 screw 9 from the Antenna P.W.B. board. (2) Gently pull the Antenna P.W.B. board outwards. 8. Removal of WS ANTENNA SUPPORT PLATE (Fig. 7) (1) Remove the 6 screws 8 and pull the WS Antenna Support Plate away from the Back case. KH/Pg 03 (Service Pt)10/11/00, 2:23 PM 3
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KH-WS1 – 4 – Fig. 3 5 9 Catches Connector H Connector Sub-Chassis I Connector E Connector F Connector G Fig. 1 Fig. 2 1 2 Back caseFront case Battery cover 4Connector 3 Catches Ant · 3 A Connector B Connector C Connector D KH/Pg 04-06 (disassembling)10/11/00, 1:47 PM 4