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1) FUNCTION IC. : LC7821-1/3

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2) MODE 2 : FREQUENCY OUT/ OUTPUT CONTROL

3) MODE 3 : IF COUNT READ

1) MODE 1 : FREQUENCY OUT/ TUNED CHECK

    

     

 

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<1> CHASSIS-TOP(44) REMOVAL.
   Remove 9 screws(A,K) and then remove the Chassis-top(44).

<2> FRONT PANEL ASS'Y(AA) REMOVAL.
   1. Remove the Chassis-top(44), referring to the previous step <1>.
   2. Disconnect the connector(CN 301, Card-cable) on the Front P. C. Board(d) from connector(CN 115) on the 
       Main P. C. Board (i).
   3. Disconnect the lead wire(CW 302, 5P) on the Front P. C. Board(d) from connector(CN 702) on the Volume
       Volume P. C. Board (b).
   4. Disconnect the connector(CN 801, 2P) on the Standby P. C. Board(g) from connector(CN 102) on the 
       Main P. C. Board (i).
   5. Remove 1 screw(I) of Chassis-panel(37) and then lead wire(H 801, 1P) on the Phones P. C. Board(e).
   6. Disconnect the lead wire(CW 301, 7p) on the Front P. C. Board(d) from connector(CN 113) on the Main
       P. C. Board(i).
   7. Disconnect the lead wire(CW 801, 3P) on the Phones P. C. Board(e) from connector(CN 401) on the Amp
       P. C. Board(h).
   8. Remove 1 screw(I) of Chassis-panel(37) and then lead wire(H 501, 1P) on the Tone P. C. Board (c).
   9. Disconnect the lead wire(CW 701, 10P) on the Volume P. C. Board(b) from connector (CN 109) on the Main
       P. C. Board(i).
  10. Remove 9 screws(H, I) and then remove the Front Panel ASS'Y(AA).

<3> FRONT P. C. BOARD(d) REMOVAL.
   1. Remove the Chassis-top(44), referring to the previous step<1>.
   2. Remove the Front-panel ASS'Y(AA), referring to the previous step<2>.
   3. Disconnect the lead wire(CW 302, 5P) from connector(CN 702) on the Volume P. C. Board(b).
   4. Disconnect the connector(CN 302) from lead wire(CW 801,5P) on the Power P.C.Board (f).
   5. Remove 15 screws(J) and then remove the Front P.C.Board(d).

<4> VOLUME P.C.BOARD(b) REMOVAL.
   1. Remove the Chassis-top(44), referring to the previous step<1>.
   2. Remove the Front-panel ASS'Y(AA), referring to the previous step<2>.
   3. Disconnect the connector(CN 702) from lead wire(CW 302, 5P) on the Front P. C. Board(d).
   4. Disconnect the connector(CN 703) from lead wire(CW 802, 2P) on the Volume2 P. C. Board(a).
   5. Disconnect the connector(CN 701) from lead wire(CW 501, 10P) on the Tone P. C. Board(c).
   6. Disconnect the lead wire(CW 701,10P) from connector(CN 109) on the Main P. C. Board(i).
   7. Full out the Volume Knob(1).
   8. Remove 1 hexagon nut(3), 1 washer(4) and then remove the Volume P. C. Board(b).

<5> VOLUME2 P. C. BOARD(a) ASS'Y(AD) REMOVAL.
   1. Remove the Chassis-top(44), referring to the previous step<1>.
   2. Remove the Front-panel ASS'Y(AA), referring to the previous step<2>.
   3. Disconnect the lead wire(CW 802, 2P) from connector(CN 703) on the Volume P.C.Board(b).
   4. Full out the Volume Knob(1).

<6> VOLUME2 P. C. BOARD(a) REMOVAL.
   1. Remove the Chassis-top(44), referring to the previous step<1>.
   2. Remove the Front-panel ASS'Y(AA), referring to the previous step<2>.
   3. Remove the Volume P. C. Board(b) ASS'Y(AD), referring to the previous step<5>.
   4. Full out the Volume2 P. C. Board(a).

<7> TONE P. C. BOARD(c) REMOVAL.
   1. Remove the Chassis-top(44), referring to the previous step<1>.
   2. Remove the Front-panel ASS'Y(AA), referring to the previous step<2>.
   3. Disconnect the lead wire(CW 501, 10P) from connector(CN 701) on the Volume P. C. Board(b).
   4. Pull out the Balance-knob(5).
   5. Remove 4 screws(J) and then remove the Tone P. C. Board ASS'Y(AC).
   6. Remove 4 hexagon nut(3) and then remove the Shield-balance(12).

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