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WM-GX780/GX788
SERVICE MANUAL
Ver. 1.2 2006.04
Sony Corporation
9-877-201-03
Personal Audio Division
2006D16-1
Published by Sony Techno Create Corporation
© 2006.04
Photo: WM-GX788
SPECIFICATIONS
Radio section
Frequency range
FM:
87.5 - 108 MHz
530 - 1 710 kHz (North, Central,
AM:
and South America)
531 - 1 602 kHz (other
countries/regions)
Tape section
Frequency response
Playback: 40 - 15 000 Hz
Recording/playback: 100 - 8 000 Hz
Output
Headphones (i) jack
Load impedance 8 - 300 Ω
Input
Microphone (MIC) jack
General
Power requirements
1.5 V
Rechargeable battery
One R6 (size AA) battery
Dimensions (w/h/d)
Approx. 77.1 × 108.0 × 22.5 mm
× 4
×
(3
1
⁄
3
⁄
29
⁄
inches) excl. projecting
8
8
32
parts and controls
Mass
Approx. 152 g (5.4 oz) (main unit only)
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
Supplied accessories
AC power adaptor (1)
Battery case (1)
Stereo headphones or earphones with
remote control (1)
Charging stand (1)
AC plug adaptor (1) (Saudi Arabian
model only)
Rechargeable battery (NH-14WM(A),
1.2 V, 1 350 mAh (min), Ni-MH) (1)
Rechargeable battery carrying case (1)
Carrying pouch (1)
Stereo microphone (1)
Design and specifications are subject to
change without notice.
RADIO CASSETTE-CORDER
US Model
AEP Model
WM-GX788
E Model
Chinese Model
WM-GX780/GX788
Tourist Model
WM-GX788
NEW
MF-WMGX788-162
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Table of Contents
Related Manuals for Sony WM-GX780
Summary of Contents for Sony WM-GX780
- Page 1 Approx. 77.1 × 108.0 × 22.5 mm × 4 × ⁄ ⁄ ⁄ inches) excl. projecting parts and controls Mass Approx. 152 g (5.4 oz) (main unit only) RADIO CASSETTE-CORDER Sony Corporation 9-877-201-03 Personal Audio Division 2006D16-1 Published by Sony Techno Create Corporation © 2006.04...
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Page 2: Table Of Contents
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE Unleaded solder has the following characteristics. COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS • Unleaded solder melts at a temperature about 40 ˚C higher than APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS ordinary solder. -
Page 3: Service Note
WM-GX780/GX788 SECTION 1 SERVICE NOTE [Service Mode] The service mode enables to operate the mechanism of WM-GX780/ 3. FF, REW modes GX788 while the MAIN board is opened. Check that the PRE-SET status is set. Rotation of the idler gear (A) (S side) is detected using the photo- Connect square wave or sine wave to resistor (R712). - Page 4 WM-GX780/GX788 [ Slider (NR) ] [ Tape drive mechanism ] Tape drive mechanism in PLAY mode Gear (NR) (FWD : Left side REV : Right side) Idler Gear Idler Gear (A)(S side) Slider (NR) (A)(T side) Gear Gear (REEL)(S side)
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Page 5: General
WM-GX780/GX788 SECTION 2 GENERAL This section is extracted from instruction manual. • LOCATION OF CONTROLS Plug in firmly. VOL* HOLD REW – MENU FF + FF/CUE REW/REVIEW Y•x Y•REPEAT** HOLD MIC** MENU ENTER FF + MENU REW – RADIO ON/BAND TUNE/PRESET –/+... -
Page 6: Disassembly
WM-GX780/GX788 SECTION 3 DISASSEMBLY Note : Disassemble the unit in the order as shown below. CASE BLOCK ASSY CASSETTE LID ASSY BUTTON REC, BUTTON ASSY ORNAMENT BLOCK ASSY REEL, FLEXIBLE RETAINER MAIN BOARD, BELT (F0) BRACKET (CASSETTE) ASSY, HOLDER (FA) ASSY... -
Page 7: Button Rec, Button Assy
WM-GX780/GX788 3-2. Button Rec, Button Assy 1 rec spring 2 button rec 3 torion spring (hold) 4 button assy 5 knob (hold) 3-3. Cassette Lid Assy 5 cassette lid assy 2 two screws (M1.4)(EG) 1 screw (M1.4)(EG) 4 shaft 3 Slide the knob (open) -
Page 8: Ornament Block Assy Reel, Flexible Retainer
WM-GX780/GX788 3-4. Ornament Block Assy Reel, Flexible Retainer 1 claw 2 claw 3 claw 1 claw 3 claw 5 ornament block assy reel 4 boss 7 flexible retainer 6 screw (M1.4) 3-5. MAIN Board, Belt (F0) 4 Remove four solders of leaf switch. -
Page 9: Motor (M901)
WM-GX780/GX788 3-6. Motor (M901) 1 two screws (M1.4) 2 motor (M901) 3 motor retainer (F1) 3-7. Bracket (cassette) Assy, Holder (FA) Assy 3 screw (M1.4) 5 bracket (cassette) assy 8 holder (FA) assy 2 lock lever (B) 6 flexible board (head) 1 two screws (M1.4 ×... -
Page 10: Pinch Lever (Ra) Assy, Pinch Lever (Na) Assy
WM-GX780/GX788 3-8. Pinch Lever (RA) Assy, Pinch Lever (NA) Assy 1 claw 2 Remove the pinch lever (RA) assy in the dereciton of the arrow. 4 Remove the pinch lever (NA) assy in the direction of the arrow. 3 claw 3-9. -
Page 11: Mechanical Adjustment
WM-GX780/GX788 SECTION 4 SECTION 5 MECHANICAL ADJUSTMENT ELECTRICAL ADJUSTMENT PRECAUTION PRECAUTION TUNER SECTION 0dB=1µV Clean the following parts with a denatured-alcohol-moistened Specified voltage : 1.3 V (DC) swab: Switch and control position [AM] record/playback/erase head pinch roller MENU switch BAND switch : AM... -
Page 12: Diagrams
WM-GX780/GX788 SECTION 6 DIAGRAMS Note for Printed Wiring Board and Schematic Diagrams Note on Schematic Diagram: Note on Printed Wiring Board: • All capacitors are in µF unless otherwise noted. pF: µµF • Y : parts extracted from the conductor side. -
Page 13: Block Diagram
WM-GX780/GX788 6-1. Block Diagram IC301(1/3) IC301(2/3) J301 POWER AMP-L R-CH Q306 IC501 RV301 REMOTE R-CH AVLS REC AMP DATA R-CH Q504 REV/FWD FWD REC/PB HEAD POWER AMP-C R-CH BEEP Q506 FWD/REV REV REC/PB HEAD BUFF Q303 Q304 Q305 MB/GRV R-CH... -
Page 14: Printed Wiring Board (Side A)
WM-GX780/GX788 6-2. Printed Wiring Board (Side A) :Uses unleaded solder. • Semiconductor Location J301 REMOTE Ref. No. Location C-10 E-11 D101 D-10 D201 D-10 D302 D-11 D303 B-11 D304 B-11 D305 B-10 D401 IC501 IC601 IC703 IC901 J501 PH701 (PLUG IN POWER) -
Page 15: Printed Wiring Board (Side B)
WM-GX780/GX788 6-3. Printed Wiring Board (Side B) :Uses unleaded solder. S503 S303 • Semiconductor REVE TUME TAPE SW Location Ref. No. Location DRY BATTERY SIZE "AA" BATTERY PACK (IEC DESIGNATION R6) D402 (Ni-Cd) 1PC 1.5V D403 NC-6WM 1.2V SPEED CONTROL... -
Page 16: Schematic Diagram (1/2)
WM-GX780/GX788 6-4. Schematic Diagram (1/2) • See page 12 for Waveforms. • See page 18 for IC Block Diagram. TP21 SVC347 470p 0.022 100k LCD701 Q704 0.0022 12A02S-TL AM OSC 100p 470k MA2S357 TP39 470k 0.0022 0.022 0.0022 Q703 TP62 0.0022... -
Page 17: Schematic Diagram (2/2)
WM-GX780/GX788 6-5. Schematic Diagram (2/2) • See page 18 for IC Block Diagrams. TP32 TP33 C608 0.0047 Q604 C606 UN5216QRS-(TX) 0.0047 TP601 C603 IC601 C609 LB11675V-TLM 0.047 C510 1 6.3V TP31 FB502 FB503 TP46 TP55 C512 1 6.3V FB501 TP47... -
Page 18: Ic Block Diagrams
WM-GX780/GX788 6-6. IC Block Diagrams TA2154FN(EL) IC301 TA2123AF(EL) SYSTEM CONTROL N.C. VCC2 MIC IN L V REF V REF NF L RADIO IN L REV REC L MIC IN R REV REC R NF R FWD REC R RADIO IN R... -
Page 19: Ic Pin Function Description
WM-GX780/GX788 6-7. IC Pin Function Description • IC701 TC9328AF-118 Pin No. Pin Name Description COM 1 to 1 to 4 Common terminal. COM 4 5 to 22 S1 to S18 Segment output terminal. MONO/ Stereo/Mono select terminal (H :STEREO / L:MONO) - Page 20 WM-GX780/GX788 Pin No. Pin Name Description LOCAL//DX TUNER sensitivity select terminal (H: LOCAL, L: DX). Phase comparator output. VREG — Power supply voltage. F/R CTRL HEAD select terminal (L: FWD, H: REW). PRE CTL PRE AMP control terminal.(H :AMP OFF / L :AMP ON)
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Page 21: Exploded Views
WM-GX780/GX788 SECTION 7 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • Color Indication of Appearance Parts • Accessories are given in the last of electrical have some differences from the original one. Example: parts list. -
Page 22: Main Section
WM-GX780/GX788 Ver. 1.2 7-2. Main Section MF-WMGX788-162 S303, S503 S302, S502 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-034-068-51 LID, BATTERY (FOR SILVER) X-3383-309-1 LID ASSY, CASSETTE (BLUE) (GX788:AEP) 3-034-068-91 LID, BATTERY (FOR BLUE) 3-245-282-01 WINDOW (CASSETTE) -
Page 23: Mechanism Deck Section (Mf-Wmgx788-162)
WM-GX780/GX788 7-3. Mechanism Deck Section (MF-WMGX788-162) M901 PM901 HP901 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks X-3377-589-3 HOLDER (FA) ASSY /M 3-007-433-12 SHEET (N), REFLECTION X-3377-228-1 LEVER (RA) ASSY, PINCH X-3377-584-5 CHASSIS ASSY (FA) 3-046-789-01 SPRING (HDA) -
Page 24: Electrical Parts List
WM-GX780/GX788 SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS • SEMICONDUCTORS parts list may be different from the parts All resistors are in ohms. In each case, u: µ, for example: specified in the diagrams or the components METAL: metal-film resistor uA...: µA... - Page 25 WM-GX780/GX788 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C404 1-107-819-11 CERAMIC CHIP 0.022uF 10.00% 16V C701 1-119-923-81 CERAMIC CHIP 0.047uF 10.00% 10V C406 1-125-837-91 CERAMIC CHIP 6.3V C702 1-125-777-11 CERAMIC CHIP 0.1uF 10.00% 10V C407 1-117-919-11 TANTAL.
- Page 26 WM-GX780/GX788 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < FERRITE BEAD > Q305 8-729-426-36 TRANSISTOR XP1215-TXE Q306 8-729-425-94 TRANSISTOR XP1116-TXE 1-414-760-21 FERRITE Q401 8-729-800-37 TRANSISTOR 2SD1048X6-TB 1-414-760-21 FERRITE Q402 8-729-927-99 TRANSISTOR 2SC4617TL-Q 1-414-760-21 FERRITE...
- Page 27 WM-GX780/GX788 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 1-218-977-11 RES-CHIP 100K 1/16W R408 1-218-953-11 RES-CHIP 1/16W 1-218-953-11 RES-CHIP 1/16W R409 1-218-961-11 RES-CHIP 4.7K 1/16W 1-218-990-11 SHORT CHIP R410 1-218-981-11 RES-CHIP 220K 1/16W 1-218-990-11 SHORT CHIP...
- Page 28 WM-GX780/GX788 Ver. 1.2 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R703 1-208-927-11 METAL CHIP 0.5% 1/16W S707 1-786-515-21 SWITCH, TACTILE(REW PRESET-) R704 1-218-985-11 RES-CHIP 470K 1/16W S708 1-786-515-21 SWITCH, TACTILE(FF PRESET+) R705 1-218-981-11 RES-CHIP...
- Page 29 WM-GX780/GX788 Ref. No. Part No. Description Remarks 3-255-270-41 MANUAL, INSTRUCTION (FRENCH, DUTCH) (GX788:AEP) 3-255-270-51 MANUAL, INSTRUCTION (SWEDISH, FINNISH) (GX788:AEP) 3-255-271-11 MANUAL, INSTRUCTION (JAPANESE, ENGLISH, KOREAN) (GX788:JE) 3-255-271-21 MANUAL, INSTRUCTION (TRADITIONAL CHINESE, SIMPLIFIED CHINESE) (GX788:JE) 3-255-271-31 MANUAL, INSTRUCTION (ENGLISH, ARABIC) (GX788:EA)
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Page 30: Revision History
WM-GX780/GX788 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2003.04...