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Sony WRT-800A Service Manual
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Sony WRT-800A Service Manual

Sony WRT-800A Service Manual

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WRT-800A
SERVICE MANUAL
AU Model

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  • Page 1 WRT-800A SERVICE MANUAL AU Model...
  • Page 2 ! WARNING This manual is intended for qualified service personnel only. To reduce the risk of electric shock, fire or injury, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

  • Page 3: Table Of Contents

    6-1. Board Layouts ..................... 6-1 6-2. Schematic Diagrams..................6-2 7. SPARE PARTS 7-1. Notes on Repair Parts .................. 7-1 7-2. Exploded View and Parts List ..............7-2 7-3. Electrical Parts List ..................7-4 7-4. Supplied Accessories .................. 7-6 WRT-800A (AU)
  • Page 4 3-860-354-31(1) Introduction Parts Identification Power Supply The WRT-800A is a wireless microphone to be used The microphone can operate on one LR6 (size AA) alkaline in combination with the WRR-800A/801A UHF battery continuously for about 12 hours at 25°C (77°F).
  • Page 5 If a battery does leak, clean all leakage from the unit and insert new battery. Leakage left in the unit may cause poor battery contact. If there seems to be poor battery contact, consult your Sony dealer. On the antenna Do not touch the antenna while using as it will significantly degrade good performance, causing drop outs, etc.

  • Page 6: Service Overview

    Grip B Remove the grip B straight out in the direction of the arrow. Nameplate Tweezers Ferrite Bead * Tools Required Harness . LR screwdriver (Sony part No. : J-6402-350-A) Unsolder. Capsule ass’y White Black Capacitor (harness) (680 pF) Capsule ass’y...
  • Page 7 Unsolder. Switch driver Vinyl-chloride sheet Plus (+) polarity terminal plate Press down the dented portion in the center of the plus (+) ANT terminal relay polarity terminal plate in the direction of the arrow using a screwdriver tip. WRT-800A (AU)

  • Page 8: Notes When Assembling Parts

    Chassis A Cut. Adhesive sheet Chassis A Apply following the bond. Sony bond master Positive (+) polarity terminal plate (Part No. 7-432-916-01) When attaching the AU-258 board to the chassis A, Positive polarity terminal plate insert the AU-258 board in the order of 1 and 2 1 Bend the leg by 135 degrees to the in the direction of the arrow as shown.
  • Page 9 SIL the 2-pin socket (CN401) securely and Capsule ass’y attach the chassis B to the chassis A. Pad rubber 5. Grip B Stop ring pliers (Sony part number: 7-721-010-07) Stick light Attach the cut-out portion to the stick light side.

  • Page 10: Electrical Alignment

    Frequency: DC to 10 MHz DC VOLT METER Effective digits: 3 1/2 digits Tools Name Part No. Remarks RF adjusting connector See next page. Adjustor 7-721-052-81 0.4x1.3mm AF input connector See next page. LR screw driver J-6402-350-A For grip removal WRT-800A (AU)

  • Page 11: Adjustment

    ..How to make an AF input connector Required Parts 3-2-10. Battery Alarm Signal Check Cable with BNC connector : 1 (Part No.1-555-758-00) Sub harness (3P) : 1 (Part No.1-956-140-11) 3-2-11. Spurious Emissions Check Sub harness Shield White Black Solder. Cable with BNC connector WRT-800A (AU)
  • Page 12 1. Preparation (1) When adjustments are performed, remove the AU-258 and RF-87 boards from WRT-800A unit. Refer to the “Section 2 Service overview” for removal. (2) Insert the harness of the AU-258 board into the connector CN302 on the RF-87 board.

  • Page 13: Vcc) Regulated Voltage Check

    DC output voltage:+1.5± 0.1 Vdc DC current meter DC current meter Frequency counter DC voltmeter Adjustor (SONY part No.7-721-052-81) RF adjusting connector (See page 3-2.) Switch and control setting S301, S302, S303, S304/ RF-87 board (A-side) Switch and control setting...

  • Page 14: Reference Frequency Deviation Adjustment

    : 20 kHz or 15 kHz Adjustment : 50 us DE EMPHASIS Adjustor (SONY part No.7-721-052-81) AF input connector (See page 3-2.) RF adjusting connector (See page 3-2.) Be sure to perform this adjustment after “3-2-3. Reference Frequency Deviation Adjustment” has been completed.

  • Page 15: Distortion Ratio Check

    (4) Check that the distortion analyzer reading is less than RF adjusting connector (See page 3-2.) 0.9 %. Switch and control setting S301, S302, S303, S304/ RF-87 board (A-side) WRT-800A S301 S302 S303 S304 Channel setting AU66 model 67-01 WRT-800A (AU)

  • Page 16: S/N Check

    (7) Check that audio analyzer (level meter) reading is 0± 1.0 dB. (8) Next, switch the oscillation frequency for the audio analyzer (oscillator) from 100 Hz to 10 kHz. (9) Check that the reading for the audio analyzer (level meter) is _1.0± 1.0 dB. WRT-800A (AU)

  • Page 17: Rf Power Output Adjustment

    Specification : Power meter reading = Maximum Adjustment : 1CT401/RF-87 board (B side) (3) Adjust 1RV401 so that the power meter reading meets the following specification. Specification : Power meter reading = 5.0± 0.2 mW Adjustment : 1RV401/RF-87 board (B side) WRT-800A (AU)
  • Page 18 2. Frequency check Connections (For connecting the DC power supply, refer to the “Prepa- rations” on page 3-3.) RF adjusting connector SMA-BNC conversion connector RF-87 Board AU-258 Board (B side) (A side) Modulation analyzer Frequency counter RF IN AF OUT WRT-800A (AU)

  • Page 19: Battery Alarm Signal Check

    Connect a jumper wire between TONE land and Spectrum analyzer GND land by soldering. (TONE signal OFF) Switch and control setting S301, S302, S303, S304/ RF-87 board (A-side) WRT-800A S301 S302 S303 S304 Channel setting AU66 model 67-01 3-10 WRT-800A (AU)

  • Page 20: Spurious Emissions Check

    ± 0.1 V so that battery alarm signal goes on. (3) Check that the frequency counter (resolution : 0.1 Hz) reading is 32.782 kHz± 1 Hz. (4) After the checking, remove (unsolder) the jumper wire between TONE and GND on the AU-258 board. 3-11 WRT-800A (AU)
  • Page 21 : 20 dB (2) Check that the spurious emissions level reading for the spectrum analyzer remains less than _40 dBm. Carrier frequency 10 dBm _40 dBm V : 10 dB/div H : 500 MHz/div 5 GHz 2.5 GHz (fc) 3-12 WRT-800A (AU)

  • Page 22: Block Diagram

    SECTION 4 BLOCK DIAGRAM WRT-800A (AU)
  • Page 23 RF carrier signal is turned off. WRT-800A is comprised of the following: The power supply voltage 3 V (VCC) for circuit is turned off about one second after the POWER switch (S201) is AU-258 board switched to OFF position.

  • Page 24: Semiconductor Pin Assignment

    DTC143ZE-TL (R1=4.7 K, R2=47 K) MA132WK-TX WIDE -TOP VIEW- -TOP VIEW- -TOP VIEW- MA133 2SC4919 UMG8-TR (R1=4.7 K, R2=47 K) MA133-TX 2SC4919-TL 2SD1328-RST 2SD1328-RST-TX 2SD2216-Q -TOP VIEW- -TOP VIEW- MA729 2SD1620 MA729-TX 2SD1620-TD -TOP VIEW- 2SK377-A 2SK377-B LBR3378S-TP-J161K ;RED WRT-800A (AU)
  • Page 25 PWRON LOGIC MUTE COMP OUT SUM IN CLOCK PWRON1 GENERATOR MUTE NJM2100E (JRC)FLAT PACKAGE CXA1786N-T4 (SONY)FLAT PACKAGE NJM2100E-T1 PLL FREQUENCY SYNTHESIZER (1.1 GHz BAND) DUAL OPERATIONAL AMPLIFIERS -TOP VIEW- (DUAL-SUPPLY TYPE) OSCI : REFERENCE FREQUENCY INPUT –TOP VIEW– OSCO φR...
  • Page 26 ; HIGH LEVEL 1; HIGH LEVEL NJM2107F (JRC)FLAT PACKAGE NJM2406F (JRC)FLAT PACKAGE NJM2107F -TE2 NJM2406F -TE2 SINGLE OPERATIONAL AMPLIFIER SINGLE COMPARATOR —TOP VIEW— —TOP VIEW— +INPUT _INPUT (+1 to +3.5V) (+2.5V to +7V) (_1 to _3.5V) _INPUT +INPUT OUTPUT OUTPUT WRT-800A (AU)
  • Page 27 1, 2, 4, AF-Muting 7, 11,12, 17, 18 Power supply 5, 9, 13, — — I/F CTS Communication 27, 29, 31, I/F TEST Communication 32, 39 to 41 47 to 50 I/F RTS Communication I/F TXD Communication I/F RXD Communication WRT-800A (AU)

  • Page 29: Schematic Diagrams And Board Layouts

    1 uH PLUS AU-258 BOARD TERMINAL RF-87 BOARD (A SIDE) (A SIDE) BOARD NO. 1-668-097-11 BOARD NO. 1-668-098-11 MINUS TERMINAL ANTENNA CAPSULE ASSY CN103 AU-258 BOARD RF-87 BOARD (B SIDE) (B SIDE) BOARD NO. 1-668-097-11 BOARD NO. 1-668-098-11 WRT-800A (AU)

  • Page 30: Schematic Diagrams

    6-2. Schematic Diagrams WRT-800A (AU) : S/N 600001 and Higher 2.9V 3.0V R102 C106 C112 220p 0.1µF R111 C117 1/16W 4.7µF 2012(B) 1/16W C120 R115 6.3V 2700p 220k R118 TA-A 3.0V C105 C109 C116 IC103 1/16W 100k R119 C125 R122 0.01...
  • Page 31 WRT-800A (AU) : S/N 600001 and Higher 3.0V Q402 Q404 DTA143ZE-TL VCC2 2SC5015-T1 Q405 2SC5015-T1 3.0V 2.9V 0.7V R412 L403 C422 R415 L404 R417 L401 8.2n 6.8n 4.7k 2.1V 3.0V 220µH 1/16W 1/16W 1/16W 2.3V 3.0V 0V C424 CT401 2.9V 2.9V...

  • Page 33: Spare Parts

    Therefore, specified parts should be used in the case of replacement. 2. Standardization of Parts Some repair parts supplied by Sony differ from those used for the unit. These are because of parts common- ality and improvement. Parts list has the present standardized repair parts.

  • Page 34: Exploded View And Parts List

    3-608-717-01 o ANT TERMINAL RELAY 3-609-615-02 o PAD RUBBER 3-612-847-01 o LABEL, MODEL NUMBER 7-623-505-01 s LUG, 2 7-624-197-41 s STOP RING 17, TYPE-C 1-500-547-11 o BEAD, FERRITE 1-414-142-11 s INDUCTOR, MICRO 1uH A-8319-010-A s UNIT ASSY(CE) 3-613-376-01 o NET INNER WRT-800A (AU)
  • Page 35 P 1.7X2 P 1.7X2 * When using Lug. 2 (Part No. 7-623-505-01), cut it. Refer to section 2-2-1. WRT-800A (AU)

  • Page 36: Electrical Parts List

    1-110-569-11 s TANTALUM, CHIP 47uF 20% 6.3V C202 1-115-167-11 s TANTALUM, CHIP 10uF 20% 4V R126 1-216-823-11 s METAL, CHIP 1.5K 5% 1/16W C203 1-162-965-11 s CERAMIC, CHIP 0.0015uF 10% 50V C204 1-164-227-11 s CERAMIC, CHIP 0.022uF 10% 25V WRT-800A (AU)
  • Page 37 1-238-858-11 s RES, ADJ, CERMET 47K CP401 1-760-668-21 s VOC 790MHZ RV104 1-238-858-11 s RES, ADJ, CERMET 47K CP402 1-251-235-11 s ISOLATOR CU407BIF-807 (For WRT-800A S201 1-762-712-11 s SWITCH, SLIDE CT301 1-141-322-11 s CAP, CHIP TYPE TRIMMER 20PF CT401 1-141-435-21 s CAP, CHIP TYPE TRIMMER 3PF...
  • Page 38 1-236-907-11 s NETWORK RESISTOR (CHIP) 100Kx4 RV401 1-238-851-11 s RES, ADJ, CERMET 220 S301 1-771-366-11 s SWITCH, ROTARY CORD S302 1-771-366-11 s SWITCH, ROTARY CORD S303 1-771-366-11 s SWITCH, ROTARY CORD S304 1-692-881-41 s SWITCH, SLIDE X301 1-760-474-11 s CRYSTAL 1.0MHz WRT-800A (AU)
  • Page 40 Printed in Japan Sony Corporation 1998. 1 16 WRT-800A (AU) E 9-976-858-01 Broadcasting & Professional Systems Company ©1998 Published by Global Support Promotion Dept .

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