TC-K700ES Servicing Routine (1)

RMbA

Member
ADVICE TO NEWBIES LIKE ME

1. Set up a work a work surface with space for the tape deck, tools, a high-intensity light, and a towel or other soft cushion that will easily slide, for the deck to sit on and be turned when necessary. Have room for a note pad and pen to conveniently write notes as you work.

2. Set up divided storage boxes for small and large parts, with the sections consecutively numbered, to place parts in as you remove them from the deck. As you remove parts, write a brief description on your note pad, such as “screws” or “spring” and the section numbers in which they’re placed.

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3. If possible, use a high-intensity headlamp.

4. Before each stage of your work, take well-focused and well-lighted closeup pictures of what you’re disassembling. Don’t rely on your memory to reassemble!

5. Don’t start the work unless you have set aside at least several hours during which you can continue uninterrupted. Take your time—don’t be in a hurry. When you get stuck: take a breather; take a long, close look at the service manual’s exploded parts diagram; and ask for help online if you’re still stumped.

6. Well before beginning the work, tell your wife or husband, partner, or significant other what you’re planning to do, about how long it will take, the space you will need, any unexpected costs that might come up, etc.

7. Disclaimer: Given the number of mistakes I made disassembling and reassembling this tape deck, undoubtedly I also made mistakes in making notes about what I was doing. So, while I hope these notes and pix are helpful, please be cautious about using them uncritically.

INITIAL DISASSEMBLY FOR CAPSTAN BELT REPLACEMENT

1. Remove the five screws that secure the cover to the chassis—two on each side (#1) and one on the rear of the cover (#2).

2. Lift the cover from the rear and slowly pull it backwards to remove it.

3. Disconnect the six transport cables from their connectors.

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4. Remove the “lid, cassette” (#17).

5. Remove the 5 screws holding the transport assembly in place—two on the top of the chassis and three on the bottom (which are not shown here).

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6. Pulling with equal force on both sides of the transport assembly, slide the transport assembly back away from the front of the chassis and out altogether, taking care to thread the released cables through the chassis access holes.


7. Looking at the bottom of the transport assembly from the rear, remove the four “screw +PS 3x6” (#329) and lift the “retainer assy, thrust” (#327) to expose the “flywheel (take-up) assy” (#336) and the “flywheel (supply) assy” (#339).


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8. Remove the old “belt, capstan” (#340). Clean the take-up and supply flywheels thoroughly with isopropyl alcohol and Q-tips until the tips no longer pick up material from the flywheels. When the alcohol has completely evaporated, install the new belt.


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9. Note: Both flywheels should spin silently, smoothly, and with a bit of momentum when released. The newly installed belt should ride at the center of the take-up flywheel, and in the lower, grooved portion of the supply flywheel.


10. Replace the “retainer assy, thrust” (#327) and secure with the 4 screws, making sure that the “clamp” (#344) are in place under the screws.


DISASSEMBLY TO SERVICE “CHASSIS ASSY, HEAD” (#213)


1. Remove the “screw +PTT 2.6X5 (S)” (#225) that secures the “plate (right) assy, fulcrum” (#224). Be careful to set aside the small white “roller, guide, threading” (#219).


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2. With your finger on the “holder, cassette” #220) to keep it from snapping open, press the “lever assy, tension, back” (#256) and allow the door to open slowly. The door will become free of the assembly.


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3. Release the lower arm of the cassette-holder “spring” (#229) and remove the spring.


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4. Remove the three screws securing “bracket, lever, detection” (#266) and “bracket assy, lever” (#271).


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4. Remove the “plate assy, ornamental” (#222), shown under 3. above.


5. Remove the “holder, cassette” (#220), “piston” (#254), and “roller, guide’ threading” (#219), taking care not to lose the small white roller guide.


6. Remove the right-hand “pinch lever (T) assy” (#211) by disconnecting the “spring, tension” (#243), removing the “stop ring 2.3, TYPE E” (#212), and then sliding the pinch-roller assy up and off the shaft.


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7. Note (photographically document) the height relationship of the left-hand “pinch lever (S) assy” (#241) to the capstan.


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Under the ADVICE TO NEWBIES LIKE ME, my first point should have been: Download the "TC-K333ESX/K700ES Service Manual" from https://www.hifiengine.com or any of the other free sources. Without it, there's no hope—with it there's a chance of figuring things out. I wasn't able to figure out everything on my own—got lots of help—but when I became more patient and understood that the exploded parts diagram had to be studied for some length of time, like several minutes instead of a few seconds, things became clearer. My excuse for being a slow learner is that I was out of practice, since it's been more than 50 years since I worked as a radar technician and test-equipment builder.
 
8. Remove the left-hand “pinch lever (S) assy” (#241) by disconnecting the “spring, tension” (#243), removing the hold-down nut “N3, TYPE 2” (#238), removing the “washer” (#210) and “collar” (#239), noting the order in which they’re placed, and then sliding the pinch-roller assy up and off the shaft, taking care to remove and set aside the “spring, compression” (#242) left on the shaft.

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9. Remove “spring” (#218).

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10. Remove “spring” (#208).

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11. Move the “chassis assy, head” out of the way, taking care not to disturb the fragile head wires and not to lose the three 2.5mm “ball, steel” (#206) in the three chassis depressions.

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12. Clean and re-grease the three tracks and replace the three “ball, steel” (#206) in them.

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13. Replace the “chassis assy, head” and reinstall “spring” (#218), noting its correct orientation. The assembly should move back and forth freely, either by pushing it directly or manually operating the “solenoid, plunger” (#PM901).

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14. Reinstall “spring (#208).

15. Reinstall the take-up “pinch lever (T) assy” (#211), reconnecting the “spring, tension” (#243), sliding the pinch-roller assy back on the shaft, and then replacing the “stop ring 2.3, TYPE E” (#212).

16. Reinstall the left-hand “pinch lever (S) assy” (#241), placing the “spring, compression” (#242) on the shaft, reconnecting “spring” #243), sliding the assembly back onto the shaft, and replacing the “washer” (#210), the “collar” (#239), and the nut “N3, TYPE 2” (#238). Make sure not to over-tighten the nut and that the pinch-roller height-relationship to the capstan is the same as before disassembly.

17. Reseal the nut.

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18. Clean the capstans and pinch-rollers with isopropyl alcohol and Q-tips to remove any “stray” grease that may have gotten on them.

19. Before reinstalling the “plate assy, ornamental” (#222), make sure the “lever, lock” (#272) is in place. The plate assy must be inserted between 2 plastic parts; the hole of the plate should correspond to the “retainer, lead” (#214) just above and behind.

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Here the plate is shown not correctly installed, so the “lever, lock” (#272) is not visible.

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20. Using a small dab of glue, reattach the two “roller, guide, threader” (#219). Replace “spring” (#229) on “plate (left) assy, fulcrum” (#231). Reinstall the “plate (right) assy, fulcrum” (#224).

21. Reinstall the “holder, cassette” (#220) with “piston” (#254) attached and inserted in its tube.

22. With the “holder, cassette” (#220) in the open position, set the short end of “spring” (#229) as before disassembly. The cassette holder should snap open when the “lever assy, tension, back” (#256) is pressed.

REINSTALLING THE TRANSPORT ASSEMBLY

1. Remove any dust or loose materials from the area of the chassis and cassette-door frame where the transport assembly is to be reinstalled.

2. Reinstall the transport assembly, moving both ends of the assembly with equal force so it slides evenly into place.

3. Screw in the two top screws that secure the transport to the chassis, but do not tighten them.

4. Check to ensure that cassette-holder releases as it should.

5. Reconnect the six transport cables, making sure they are fully seated in their connectors.

6. Power up the deck and confirm that all transport functions (PLAY, REW, and FF) are working normally.

7. Screw in the bottom three screws that secure the transport to the chassis.

8. Tighten the top two screws to secure the transport to the chassis.

9. Replace the “lid, cassette” (#17).

10. Reinstall the cover with all 5 screws.

LAST LOOSE ENDS

1. If you have discovered my mistakes in this servicing routine or have suggestions to improve it, please post them to this thread.

2. If other audiokarma.org members have been helpful to you in servicing a TC-K700ES, please credit them on this thread; or if you have discovered helpful TC-K700ES YouTube videos, please share them here.

3. I am truly indebted for the time, patience, and know-how of hdrobien, which were never lessened by my endless questions, mistakes, and bellyaching.
 
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Regarding number 11 above under DISASSEMBLY TO SERVICE "CHASSIS ASSY, HEAD" (#213), if you misplace or otherwise lose one or more of the three 2.5mm "ball, steel" (#206), let me know by replying to this thread and I'll send replacements to you gratis. I wound up buying 250 of them for next to nothing, so glad to share.
 
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