Denon DR-M07 - Electrical Parts

g OR-M07
METHOD OF ADJUSTMENT
{1] SPECIFICATIONS FOR MECHANICAL PARTS
Table 1
Item Standard Remarks jaa.
Winding torque (PLAY) 30 ~ 60 gcm SONY (TW-2111}
FF. REW torque 65 ~ 125 gem SONY (TW-2231) pera eee seieesh
Back tension torque 1~ 5 gcm SONY (TW-2111) the direction shown by an
Pinch roller pressure 160 ~ 260g Note 1 arrow in the playback
FF. REW duration within 120 seconds C-60 mode, and read the value
when the pinch roller stops
rotating.
Note: 1. Measurement for pinch roller pressure :
Fig. 12
{II] SPECIFICATIONS FOR ELECTRICAL PARTS
® Preparation for measurement
1. Measuring Tools Required for Adjustment
* Screwdriver for adjustment: small regular screwdriver for adjusting the semi-fixed volume control
Low-frequency oscillator
Attenuator
* V.T.V.M.
Oscilloscope
Frequency counter
* Test Tape (TEAC MTT-111, MTT-114, MTT-150, DENON HD-7, or equivalent)
Digital voltmeter
® Precautions for Adjustment
(1) Before adjustment, clean the head surface, capstan shaft, and pinch roller with a soft cloth dampened with
alcohol.
(2) Demagnetize the recording head and the erasing head with a head demagnetizer.
(3) Demagnetize the screwdriver used for adjustment.
(4) Set the recording input level to the maximum (i.e., turn the volume control clockwise.)
(5) Set the Balance Volume, Bias Fine Volume to the center.
(6) Use LINE IN as the input, and LINE OUT as the test points (refer to Fig. 19 for further details). Set the
switches as follows, if not otherwise specified.
DOLBY NR switch: OFF
TAPE SELECTOR switch: NOR
1. Playback Adjustment
1-1. Azimuth Adjustment
Playback the test tape (TEAC MTT-114). Set the azimuth adjusting screw so as to set A to the maximum and B to
the minimum in accordance with the Lissajous’ figure.
(Some oscilloscopes may be of the model in which A and B are reversed. Be sure to check that the phase of the
signal in the left channel is the same as that in the right channel.)
REC/PB Head
Azimuth Adj. Screw
Test Tape (MTT-114)
Fig. 13