Denon DTR-80P Remote Control Circuit Information

The following information was typed up from a photocopy of one page of what
is presumably a service guide for the Denon DTR-80P. The main point of
interest is the diagram of the remote-control circuit, which is reproduced
as a GIF and should accompany this file. Most of the information below is
concerned with modifying a remote control unit to enable the test mode.

Notes:-
   (1) Clarification of the values shown in the GIF:-
       For resistor values, for "F" read "ohms" and for "KF" read "kilohms".
       Variable resistor values are in ohms.
       Capacitor values are in nanofarads.
   (2) No doubt the copyright etc. of this circuit design belongs to Denon.
   (3) E&OE.
   (4) Any attempts at modifying or building a remote-control are at
       your own risk. All and any other disclaimers!

                                                         24th Nov. 1993

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16. ADJUSTMENT

Adjustment points and explanation
   ___________________________________________________________________
  | No |     ITEM             |  Adjustment VR |       Tools          |
  |-------------------------------------------------------------------|
  | 1  | Linearity adjustment | Mechanical     |  Oscilloscope,       |
  |    |                      |                |  Test tape DAT-ER01  |
  |----|----------------------|----------------|----------------------|
  | 2  | Cylinder and clock   | VR601          |  Oscilloscope,       |
  |    | pulse synchronism    |                |  Test tape DAT-PG01  |
  |----|----------------------|----------------|----------------------|
  | 3  | REC level adjustment | VR301          |  Oscilloscope,       |
  |    |                      |                |  Test tape DAT-ER01, |
  |    |                      |                |  DAT-tape (non       |
  |    |                      |                |  recorded tape)      |
  |----|----------------------|----------------|----------------------|
  | 4  | Error rate check     |                |  Frequency counter   |
  |    |                      |                |  Test tape DAT-ER01  |
  |____|______________________|________________|______________________|

  16.1. TEST MODE

1) How to start the TEST MODE.

      DTR-80P has the TEST MODE. To start the TEST MODE, the following
      steps must be followed.

         1. Make the Test-Remoto-Control by adding a resistor (20 kilohm
            +/- 1%) and a tact switch to remoto control circuit.
            (See Fig. 11)
         2. Turn the power switch on.
         3. Connect the Test-Remoto-Control to the headphone terminal.
         4. Slide the "HOLD" switch and the "TIMER" switch of the
            Test-Remoto-Control to the "OFF" position.
         5. Set the DAT tape.
         6. Press the "TEST" button of the Test-Remoto-Control for a second.
         7. Now DTR-80P starts the TEST MODE and "T-NTP" is displayed on the
            LCD.

       The following three TEST MODE repeats whenever the "TEST" button of
       the Test-Remoto-Control is pressed at a time.

               T - NTP  (Without tape check mode)
               T - LIN  (Linearity adjustment mode)
               T - SID  (Start-ID detecting check mode)

       NOTE: to return normal MODE from the TEST MODE, turn the power
       switch off and on.

Fig. 11  Test-Remoto-Control circuit

                           [SEE GIF]

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Just in case you have trouble reading the values of the resistors, they are:
8.2k, 2.7k, 160, 3.3k, 3.9k, 4.3k, 180, 5.1k, 360, 6.8k, 8.2k, 11k, 13k, 1k.