Denon DR-M33HX - FF and REW Time Check; ADJUSTING THE ELECTRICAL SECTIONS; Tape Transport Check and Azimuth Adjustment; Tape Speed Check and Adjustment

12. Checking the FF and REW Times
Load a C-60 cassette tape; check to make sure the tape is
fast forwarded or rewound within 70—110 seconds. If
it is not within this range, check sections 9 and 11.
13 Checking the Operation of the Erase Preven¬
tion, Metal and Chrome Switch Operation
Arms
Check to make sure the operation arms 58, 59 operate
the switches positively, depending on whether or not there
are holes.
14. Checking the EJECT Switch 75
To check the operation of the EJECT SW with only the
mechanism unit, make sure the angle 205 operates the
switch positively when the hook lever 203 is operated.
15. Checking the Gap Between the Pulse Detection
LED and the Reel Ass'y
Check to make sure the gap between the surface of the
shutter section of the reel ass'y and the LEDs is approxi¬
mately 1 mm.
25 Reel Ass'y
• Measuring instruments necessary for adjustments
(1) Audio signal generator
(2) Variable resistance attenuator
(3) Vacuum tube voltmeter
(4) Oscilloscope
(5) Frequency counter
(6) Adjustment screwdriver
(7) Trap coil adjustment square stick
(8) Test tapes (MTT-111, MTT-114, MTT-150)
(TCC-262)
(DENON DX3H, DXM, HD7E, LX)
(9) Transport Check cassette tape
(MC-112C)
• Cautions on adjusting
(1) Before adjusting, clean the head surface, capstan and
the pinch roller with a gauze or a cotton swab moisten¬
ed with alcohol.
(2) Demagnetize the R/P HEAD and the E. HEAD with a
head eraser.
(3) Completely demagnetize the adjustment screwdriver.
(4) Unless instructed otherwise, set the various controls
as follows:
-INPUT volume. maximum
- OUTPUT LEVEL volume. maximum
- DOLBY NR switch .OFF
- MONITOR switch.TAPE
- BIAS FINE ADJ. Volume (DR-IVI33HX) . . . Center
1. Tape Transport Check
Load the transport check cassette (MC-112C). In the oper¬
ational mode, illuminate the fixing guides of the R/P HEAD
with a lamp and cfiBek^fe-Wake sure the tape edge does
not come in contact with the tape guide section.
The tape transport is the most important element in de-
terming the performance of a cassette deck.
Avoid moving the various adjustment screws, nuts, etc., as
much as possible. Refer to the pages on "Adjusting and
Checking the Mechanism Section" when replacing or adjust¬
ing the R/P HEAD.
2. Adjusting the Azimuth
(1) After completing the tape transport check load the
test tape (MTT-114).
(2) Play back the test tape; adjust the azimuth screw so
that section A of the resurge wave form is maximum
and section B is minimum.
MTT-II4
3. C hecking and Adjusting the Tape Speed
1) Connect the frequency counter to the LINE OUT
terminal and load the test tape (MTT-111).
DR-M44HX
2) Play back the test tape; at the midpoint of the tape,
where the transport is stable, adjust VR 901 so that
the frequency counter reading is in the range of 3,000
Hz± 6Hz.
DR-M33HX
3) Playback a test tape. At about halfway through the
tape, where the tape transport is stable, adjust the
adjustment points on the back of the capstan motor
so that the frequency counter will have a reading with¬
in the range of 3,000 Hz ± 6Hz.
DC motor Hole sensor P.W.B
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