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XR-4803
SERVICE MANUAL East European Model
Model Name Using Similar Mechanism NEW
Tape Transport Mechanism Type MG-25F-136
SPECIFICATIONS
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FM/MW/LW CASSETTE CAR STEREO
MICROFILM
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TABLE OF CONTENTS 1. GENERAL ................................................................... 3 2. DISASSEMBLY ......................................................... 9 3. ASSEMBLY OF MECHANISM DECK ........... 11 4. MECHANICAL ADJUSTMENTS ....................... 14 5. ELECTRICAL ADJUSTMENTS Test Mode ........................................................................ 14 Tape Deck Section .......................................................... 14 Tuner Section ...............
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SECTION 1 This section is extracted from instruction manual. GENERAL – 3 –
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SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. FRONT PANEL ASS’Y 1 Push the button (release). A 2 Remove the front panel ass’y to the direction of the arrow A. COVER ASS’Y 1 2 2 1 3 cover ass’y 2 1 – 9 –
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SUB PANEL, MECHANISM DECK (MG-25F-136) 5 screw (PTT2.6 × 6) 3 connector (CN351) 6 mechanism deck (MG-25F-136) 4 flexible flat cable (CN301) 2 sub panel 1 three screws (PTT2.6 × 8) 1 three screws (PTT2.6 × 8) MAIN BOARD, HEAT SINK 5 two screws 5 three screws (PTT2.6 × 5) (PTT2.6 × 10) 1 screw (PTT2.6 × 8) 3 two ground point screws 5 screw (PTT2.6 × 8) 4 main board 6 heat sink 2 rubber cap (25) 1 two screws (PTT2.6 × 8) – 10 –
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SECTION 3 ASSEMBLY OF MECHANISM DECK Note: Follow the assembly procedure in the numerical order given. 7 Holder the hanger by bending the claw. HOUSING 5 Fit projection on C part. 1 Install the catch to the hanger. 2 Install the hanger onto two claws of the housing. hanger 4 Fit claw on B part. 3 Put the housing 6 Fit projection on D part. under A part. housing C part 8 Hold the hanger by bending the claw. D part A part B part ARM (SUCTION) 2 Move the arm (suction) in the arrow directi
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LEVER (LDG-A) / (LDG-B) shaft A shaft B shaft C shaft A shaft B 1 Fit the lever (LDG-A) on shafts A – C and install it. 3 type-E stop ring 2.0 2 Fit the lever (LDG-B) on shafts A and B and install it. GEAR (LDG-FT) gear (LDG-D) 6 polyethylene washer hole 5 gear (LDG-FT) hole lever (LDG-A) gear (LDG-FB) 4 Align hole in the gear (LDG-D) with hole the lever (LDG-A). 1 2 tension spring (LD-2) 3 Move the lever (LDG-B) 2 tension spring (LD-1) in the arrow direction. – 12 –
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GUIDE (C) 2 guide (C) 1 three claws – 13 –
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SECTION 5 SECTION 4 ELECTRICAL ADJUSTMENTS MECHANICAL ADJUSTMENTS 1. Clean the following parts with a denatured-alcohol-moistened TEST MODE swab: This set have the test mode function. In the test mode, FM Auto playback head pinch roller Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments rubber belt capstan can be performed easier than it in ordinary procedure. idler 2. Demagnetize the playback head with a head demagnetizer. 3. Do not use a magnetized screwdrive
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FM Stereo Separation Adjustment TUNER SECTION 0 dB=1 μV Setting: [SOURCE] button: FM Cautions during repair When the tuner unit is defective, replace it by a new one be- FM RF signal level meter antenna jack (J1) cause its internal block is difficult to repair. generator 4 Ω 0.01 μF Note: Adjust the tuner section in the sequence shown below. + 1. FM Auto Scan/Stop Level Adjustment. set – 2. FM Stereo Separation Adjustment. 3. AM (MW) Auto Scan/Stop Level Adjustment. Carrier frequency : 98.0 MH
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AM (MW) Auto Scan/Stop Level Adjustment Adjustment Location: Make this adjustment after “FM Auto Scan/Stop Level Adjustment”. —SET UPPER VIEW– Setting: [SOURCE] and[MODE] button: MW Tape Speed Adjustment 30 Ω 15 pF 65 pF AM RF signal generator AM dummy antenna (50 Ω) set antenna jack (J1) Carrier frequency : 999 kHz 30% amplitude modulation by TU1 1 kHz signal Output level : 33 dB (44.7 μV) Procedure: 1. Set to the test mode. (See page 14.) 2. Push the[SOURCE] button and set to FM. 3. Push the[M
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SECTION 6 DIAGRAMS 6-1. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC501 m PD17707GC-529-3B9 (SYSTEM CONTROLLER) Pin No. Pin Name I/O Function 1 AMSSEL I Setting terminal for the AMS selection fixed at “L” 2 POS3 I 3 POS2 I Tape position detect input from tape operation switch on the mechanism block 4 POS0 I 5 POS1 I 6 TAPEON O Tape system power supply on/off control signal output terminal “H”: tape on 7 CM ON O Capstan/reel motor (M901) drive signal output terminal “H”: motor on Loa
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Pin No. Pin Name I/O Function Input of acknowledge signal for the key entry Acknowledge signal is input to accept function 41 KEYACK I and eject keys in the power off status On at input of “L” 42 BU IN I Battery detect signal input terminal “H”: battery on METAL control in/out terminal At initial mode: auto/manual mode selection input of METAL function “L”: manual mode 43 MTLSEL I/O At manual mode: METAL on/off control signal output to the CXA2509AQ (IC301) “H”: METAL on At auto mode
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Pin No. Pin Name I/O Function 69 UNISO O Serial data output terminal for the unilink Not used (open) 70 UNISI I Serial data input terminal for the unilink Not used (fixed at “L”) 71 UNICKO O Serial data transfer clock signal output terminal for the unilink Not used (connected to pin ^¥) 72 BUSON O Bus on/off control signal output terminal Not used (pull up) 73 SYSRST O Reset signal output terminal “L”: reset Not used (pull up) 74 VREG O CPU regulator output terminal Connecte
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