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SONY WMFX877
Service Manual


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  • Contains Circuit Diagrams
  • Download
  • PDF Format
  • Complete manual
  • Language: English
Price: $4.99

Description of SONY WMFX877 Service Manual

Complete service manual in digital format (PDF File). Service manuals usually contains circuit diagrams, printed circuit boards, repair tips, wiring diagrams, block diagrams and parts list. Service Manual ( sometimes called Repair Manual ) is used mainly by technicians.

If You just want to know how to use Your tv, video, mp3 player etc. You should look for Owner's Manual. After placing order we'll send You download instructions on Your email address.

The manual is available in languages: English

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Text excerpt from page 3 (click to view)
SECTION 1 SERVICING NOTES
This set detects the rotation of the idler gear (A) (side S) using the PH1 (photo reflector). The PH1 is mounted on the MAIN board, therefore the idler gear (A) (side S) cannot be detected with the MAIN board removed. As a result, the motor (M601) cannot be controlled, causing malfunction. Further, the DIRECTION switch (S1) is also mounted on the MAIN board, and with the board removed, the mechanism position cannot be detected and the operation is not changed over. Therefor, when the voltage check is executed with the MAIN board removed, follow the procedure provided below. 1. Setting (1) Refer to “3. DISASSEMBLY”, and remove the MAIN board. (2) Connect the MAIN board to the motor (M601) and the plunger (PM901) using jumper wires. These can be connected easily with the use of the extension tool (Part No. 1-769143-11) (ten in one set). (3) Short the TAPE DETECT switch (S901-1) terminals and the ATS switch (S901-2) terminals. (4) Connect the AF oscillator to the Q15-1 (COLLECTOR) and the TP23 (GND). (5) Supply 1.3 V to the battery terminals using the regulated power supply. 2. Preset state To set the PLAY, FF, REW modes, the preset state must be set. (1) Check that the slider (NR) and the DIRECTION switch (S1) are set to the center position. If not, set the preset state as follow. (2) (3) Move the DIRECTION switch (S1) to the side, which the slider (NR) is facing. The slider (NR) will move when the regulated power supply switch is set to OFF once and then set to ON. Move the DIRECTION switch (S1) according to this timing and set to the center position. 3. FF, REW modes (1) Check that the preset state is set. (2) Input the square wave or sine wave to the Q15-1 (COLLECTOR) and the TP23 (GND). (3) Press the [   RADIO OFF] button (S3) to set the STOP mode. p (4) Press the [FF AMS] button (S4) or the [REW AMS] button (S5). 4. PLAY mode (1) Check that the preset state is set. (2) Input the square wave or sine wave to the Q15-1(COLLECTOR) and the TP23 (GND). (3) Press the [   RADIO OFF] button (S3) to set the STOP mode. p (4) Press the [           REPEAT] button (S9) will move the slider 9( (NR) once towards the side R and then to the side F. Move the DIRECTION switch (S1) according to this timing will set the PLAY mode (side F). Press the [            REPEAT] 9( button (S9) another time and move the DIRECTION switch (S1) according to the movement of the slider (NR) will set the PLAY (R mode).
Note 1: If the above fails, perform from preset again. Note 2: Use the [           REPEAT] (S9), [   RADIO OFF] (S3), 9( p

[FF AMS] (S4), and [REW AMS] (S5) buttons on the remote
controller as much as possible. If no remote controller, do not touch the buttons with your hands, but using a stick with a round tip. Note 3: When using headphones, the timing for move the DIRECTION switch (S1) can be determined from the beep sound.

– MAIN Board (side B) – TAPE DETECT (S901-1) ATS (S901-2)

connect to the plunger (PM901) square wave AF oscillator (sine wave) 10 Hz, – 3.5 dB
+ –

battery terminal ’

battery terminal ‘

FF AMS (S4) REW AMS (S5)
œ REPEAT (S9) p RADIO OFF (S3)

Q15 PH1

S1 DIRECTION FWDNSTOPnREV

TP23 (GND)

connect to the motor (M601)

–3–

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