Hitachi-KHWS1W-dr-sm 电路图 维修手册.pdf

No. 0096E SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT KHWS1W KHWS1WUN November 1999 DIGITAL RECEIVER HITACHI CONSUMER PRODUCTS (S) This documentation is applied to rescrictions for management, export and supply to overseas based on the Wassenaar Arrangement. CONTENTS SPECIFICATIONS .2 SERVICE POINTS .3 ADJUSTMENTS .7 TROUBLESHOOTING .10 BLOCK DIAGRAM OF ANTENNA AND TUNER UNIT.17 DATA OF MICROPROCESSOR .18 SEMICONDUCTORS.24 WIRING DIAGRAM .30 PRINTED WIRING BOARD.31 METHOD OF REMOVED IC .36 CIRCUIT DIAGRAM .37 BLOCK DIAGRAM .41 EXPLODED VIEW.43 REPLACEMENT PARTS LIST .45 01/BKpg KH-WS1 cover10/11/00, 1:42 PM1 RadioFans.CN 收音机爱 好者资料库 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 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 Output/Impedance:Headphones (stereo)/ Suitable impedance: 8-100 Line out (stereo)/2.2 k 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 PM2 RadioFans.CN 收音机爱 好者资料库 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 PM3 RadioFans.CN 收音机爱 好者资料库 KH-WS1 4 Fig. 3 5 9 Catches ConnectorH Connector Sub-Chassis I ConnectorE ConnectorF ConnectorG Fig. 1 Fig. 2 1 2 Back case Front case Battery cover 4 Connector 3 Catches Ant 3 A Connector B Connector C Connector D KH/Pg 04-06 (disassembling)10/11/00, 1:47 PM4 KH-WS1 5 Fig. 4 Fig. 5 5 6 KH/Pg 04-06 (disassembling)10/11/00, 1:47 PM5 KH-WS1 6 Fig. 6 Fig. 7 metal pin 7 8 Connector J 9 KH/Pg 04-06 (disassembling)10/11/00, 1:47 PM6 KH-WS1 7 ADJUSTMENTS Adjustment points (Must adjust RADIO Part only. Adjustment on WS Part is not necessary.) Remarks: * After adjustment, should be fix following parts by Electro Wax. L201, L202, L206 * After adjustment, do not touch the alighed components. (especially L201 and L202) KH/Pg 07-09 (Adjustment)10/11/00, 1:48 PM7 KH-WS1 8 Adjustments (1) Before Adjustment 1) Set the Power SW to ON. 2) Set the Radio Function. (2) Alignment for Tuning Capacitor Voltage Range (Covering) 1) Required Instruments * Signal Generator * DC volt meter 2) Alignment Procedure * Connect a DC Volt meter to TP4 (J201) (3) Alignment for AM IF and MW, SW1, 2 Tracking BandOutput Terminal FMTP4 MWTP4 SW1TP4 SW2TP4 SG frequency & SET TuneAdjustmentReading 87.5 MHzL2021.4 V 0.1 108 MHz6 7.5 V 1)520 kHz (10 kHz step)/522 kHz (9 kHz step)L2101.2 V 0.1 2)1620 kHzCT2077.2 V 0.3 3)Repeat step 1-2 1)2.3 MHzL2081.1 V 0.1 2)7.3 MHzCT2058.8 V 0.3 3)Repeat step 1-2 1)9.5 MHzL2091.6 V 0.1 2)26.1 MHzCT2069.0 V 0.3 3)Repeat step 1-2 Remarks: Instrument Connection *1: With a 470 F/6.3 V capacitor to the TP2 (-) and J209/+B(+) IC202. *2: Mean Note 2 (See page 17) Note: AM TRACKING ERROR SPEC 6dB. StepItem 1AM IF 2(1)MW Ant (2) (3) 3(1)SW1 Ant (2) (3) 4(1)SW2 Ant (2) (3) Required Instrument & Connection InstrumentInputOutput Genescope (*1)Ferrite Ant.*2TP1 AM signal generatorF. Ant *2TP1 400 Hz, 30% Mod. ACVTM, oscillscope MW: Note 2P1TP1 SW1,2: Note 5 P1TP1 Genescope orReceivingAdjustReading SG Freq.Freq. (Set) 450 kHzHigh end Freq.T202Max. Note 1 600/603 kHz600/603 kHzL206Max. 1400/1404 kHz1400/1404 kHzCT204 Repeat steps (1) & (2) 3.2 MHz3.2 MHzL205Max. 7.1 MHz7.1 MHzCT203 Repeat steps (1) & (2) 11.65 MHz11.65 MHzL204Max. 21.45 MHz21.45 MHzCT202 Repeat steps (1) & (2) KH/Pg 07-09 (Adjustment)10/11/00, 1:48 PM8 KH-WS1 9 (4) Alignment for FM IF and FM Tracking Note: 1. Feed in a week signal from the Genescope. Adjust T202 for max. gain and the waveform of Fig. 1. 2. Connect AM signal generator to loop antenna, bring near to ferrite antenna. 3. Input signal methode as follows. 4. Feed in a week signal to IC201 (Note 3) from the genescope. Use the T201 core to from the S- curve shown in the Fig. 2. Adjust the symmetry of A and B about point C for linearity. 5. SW1, SW2 dummy antenna is shown in Fig. 3. 6. FM dummy antenna is shown in Fig. 4. R1=Rg=SGs output impedance (75 ), R2=75 - Rg/2 (5) Alignment for Clock Time Accuracy StepItem 1IF 2(1)FM (2) (3) Required Instrument & Connection InstrumentInputOutput GenescopeIC201TP1 Note 3 FM signalP1TP1 Generator 400 Hz, 22.5 kHz Dev Note 6 Genescope orReceivingAdjustReading SG Freq.Freq. (Set) 10.7 MHzHigh End (orT201Max. 106.1 MHz)Freq.Note 4 90.2 MHz90.2 MHzL201Max. 106.1 MHz106.1 MHzCT201 Repeat steps (1) & (2) BandAdjustment FMCT301 ProcedureConnection 1)Tune FM to 108 MHz 2)Connect a Freq. Counter to J308To J308 3)Adjust CT301 to reach the frequencyTo Counter 118.7 MHz 1.5 kHz KH/Pg 07-09 (Adjustment)10/11/00, 1:48 PM9 KH-WS1 10 TROUBLESHOOTING No No No No No Yes Yes Yes Yes Yes Yes Yes No Yes No No Yes Yes No V in Pin No. 21 22 23 50 51 53 WS H H L H H H RADIO H L H L H H 3.6V <3.6V V out H L No No Yes Yes OK Connect to AC outlet. Can the time display appear? Can the power SW turn ON? Can the power SW turn ON after pressing the Reset key? Is the oscillator circuit of IC301 and pin in operation? Check IC301 control circuit. Does the time and BATT displays appear on the LCD, then they disappear after 2 seconds? Check IC301. Does the port of IC301 pin operate in H? (+3V) IC303 or Q303 is broken down. IC303 operation Does every port of IC301 , , , , and pin operate on the following? Check around IC301. Is it broken down? Is the LCD display followed the right table? Check and follow the flowchart for each functions. Proceed to each flowchart. Is the voltage to the Voltage Selector set correctly? Disconnect the power cord and set the voltage correctly. Check the +3 V line. Check, the oscillator circuit or IC301 is broken down. Check BATT display. Is BATT blinking on the LCD? Check Q302, 307 and D318 CN302 Pin IC301 Pin <4.2VBATT blinks. Check the AC voltage or replace the battery in case of battery exhaustion. Check whether IC301 pin line is in H or not. LCD display Display when the power turns ON without signal. eg) Check after resetting. WS Function WS SAT / SEARCH / AFRST - 1 / Displaying NO BEAM and the function FM Function FM 87.50MHz Is the voltage to IC301 pin 3 V? Is the oscillator circuit of IC301 and pin in operation? Failure in the oscillator circuit of IC302 pin for the LCD driver or in IC302 1. System Check KH/Pg 10-17 (TroubleSht)10/11/00, 1:50 PM10 KH-WS1 11 WS Function No No No Yes LCD Display A WS (SC) LEVEL 1 STEREO LOCKED W SS A T Yes Yes Yes Yes At receiving WS SAT SEARCH AFRST1 NO BEAM (when no signal received) Display Broadcast name (when any signal received) 1 * or eg) or C B B Is the display of part on LCD followed on the following? Is there any sound from speakers even though the display is correct? Problem may in WS circuit. Proceed to item (2). Does only the part of Function display appear? LCD display is abnormal though any trouble is not found in receiving operation. Are the operations of terminal pins for CN304 followed on the table 1 when CN304 is disconnected? Failure in IC301 or CN304 Figure 1 PG304 CN304 1LHH55 2(L) HHH44 3Clock signal33 5Clock signal22 6LLClock signal11 7HHH77 8LLL5771 9LClock signal5974 10LClock signal5872 11LLL6075 Power Off (STANDBY) Power On (NO BEAM) At receiveIC101 No. 64 Pin 80 Pin Table 1 2. WS section (1) Determine whether WS circuit malfunctions or communications to control microcomputer malfunction. KH/Pg 10-17 (TroubleSht)10/11/00, 1:50 PM11 KH-WS1 12 (2) Checking and flowchart for WS circuit Determine the display on LCD and the presence or absence of sound from speakers after turning the power ON. Note:The terminal number of IC101is assumed 64-pin type in the flowchart. For 80-pin type, refer to tables 1 to 4 and note. Start No Yes WS Function YesYes Start No Yes Yes Note : 80 Pin Type nos. and No No No No Is any sound output from speakers when changing the mode into RADIO? Check the audio circuit around IC206, IC207, and IC210. No Check whether IC301 , and pin are in H or not. Check the terminals of PG304 to IC101, IC101 may malfunction. No Is the oscillator circuit of IC101 and pin in operation? Check the oscillator circuit or IC101 may be in failure. Is IC103 pin clocked in at 14.725 MHz Check R155 and around IC103 pin. Are IC102 , , , pin and IC103 , , , pin followed the table 3? Check every port of IC102 and IC103. Is IC103 pin clocked out at 24.576 MHz and clocked into IC102 pin? Check around IC102 pin and IC103 pin, IC103 may malfunction. Are the operations of IC103 and pin followed the table 4? Check around IC103, IC103 may malfunction. Is any clock signal found in IC101 and pin? Table 2 Table 3Table 4 HH H H H H H IC101 No. 64 Pin80 Pin Power Off (STANDBY) Power Off (STANDBY) Power On (NO BEAM) Power On (NO BEAM) At receive At receive Connect to another IC Connect to another IC 28 36 29 37 3038 32 40 33 41 41 42 43 46 47 53 54 58 59 52 L L L L L L L L L L L L L L L L L L (reset) HL (reset) H H L L L L L (reset) HL (reset) HL (reset) Sync Pulse Data signal Data signal Data signal Clock signal Clock signal 27 21 26 25 24 28 20 IC102IC103 7 41 40 39 2 IC102 No. Power Off (STANDBY) Power On (NO BEAM) At receive Connect to IC 101 No.IC102 No. 30 31 32 33 16 22 23 27 3