Adjusting And Checking The Mechanism Section - Denon DR-M33HX Service Manual

8. How to Remove the Logic Circuit Board
(1) Remove the top cover 240. (Refer to section 1)
(2) Remove the CTS circuit board 217. (Refer to section
6
)
(3) Remove the various connectors from the logic circuit
board 202.
(4) Unscrew the 2 screws (3x8 CBTS P tight) 301 holding
the logic circuit board.
(5) Unscrew the screw (3x10 CBTS P tight) 302 holding
the P.W.B support 241.
(6) Pull the logic circuit board 202 forward until the
DIN jack 240 is disconnected from the rear of the
chassis 201; it can then be removed.
9. How to Remove the HX PRO circuit Board
(1) Remove the top cover 240.
(2) Remove the connectors from the HX PRO circuit
board 262.
(3) Remove the 2 screws (301) which secure HX PRO
circuit board. Then the HX PRO circuit board may
be removed.
10. How to Remove the Power Supply Circuit
Board
(1) Remove the top cover 240. (Refer to section 1)
(2) Unscrew the 1 screw (3x8 CBTS P tight) 301 holding
the bracket 216 of the power supply circuit board
215.
(3) By pulling the power switch lever 230 out of the power
supply switch, the power supply circuit board can be
removed upwards.
Before replacing the pinch roller, clean the tape contact
surface of the pinch roller and the capstan shaft.
Most causes of poor tape transport can be traced to dirty
pinch rollers and capstan shafts.
The right side pinch roller 23 can be taken out by remov¬
ing spring 24 and slit washer 317. In the same manner,
the left side pinch roller 104 can be taken out by remov¬
ing spring 106 and SPECIAL NUT 100. After replacing,
play a padless C-90 tape and check for tape curls at the
head tape guide section.
In addition, in the playback mode, check to make sure
that the right side pinch roller contacts the capstan shaft
before the left side pinch roller contacting.
P. Roller arm L
P. Roller orm L
2. Checking the Pressure Force of the Pinch
Roller
In the playback mode, hook a spring weight onto the
bracket at the center of the pinch roller. After separating
the pinch roller from the capstan shaft, allow the pinch
roller to contact the capstan shaft again. When the pinch
roller starts to rotate, check to make sure the rod type
spring weight reading is 350g—450g for the right side and
150g ~ 250g for the left side.
If it is not within the normal range, replace the pinch
roller spring 24 or 106.
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