Denon DR-M33HX Service Manual page 17

(2) Adjusting the record/playback levels
1) Load the test tape DX7/50N and record a signal
of IkHz (-41 dB).
2) Adjust RT103 (L ch), RT203 (R ch) so that the
output level is the same when the MONITOR switch
is switched from SOURCE to TAPE position.
3) Load the test tape and record a signal of 1kHz (—41
dB).
4) Adjust RT 102 (L ch), RT 202 (R ch) so that the
output level is the same when the MONITOR switch
is switched from SOURCE to TAPE position.
5) Load the test tape DX3 and record a signal of 1kHz
(-41 dB).
6) Adjust RT104 (L ch), RT 204 (R ch) so that the
output level is the same when the MONITOR switch
is switched from SOURCE to TAPE position.
(3) Checking the Dolby C record/playback overall fre¬
quency response
1) Set the DOLBY NR switch to the "C" position.
2) Using the test tapes DXM, DX7/50N, DX-3, perform
record/playback in the same manner as 8-(1).
3) Check to make sure that the record/playback overall
frequency response meets the specifications in the
diagram.
Dolby C Record/Playback Overall Frequency Response.
Tape; DX7N
Dolby: on, C
Level; —20dB from Dolby
■ggaMB
—
BasaaBBBBsan
iBsaga
■IBBBIlIBBBiBaaHBHiaiQaHl
■■■■■iiaiaHaBBMiiBiBI
■BiHfliia B
aaaaBBBBBBBM
0--
^ "
y
* /
HaiaBHiiiBB
■■■■■lIBBaBBaBHIIIMBI
"3--
1 1 1 ini 1 1 1 M MiMxr ]
■■■■■iiHaBBaMBiiiwn
- V
\
20 50 100
200 500 IK 2K 5K lOK 20K
9. Adjusting the CTS
(1) Adjusting the CTS Amplifier Gain
1) Load the test tape HD7E.
2) Connect the oscilloscope to the test point TP(L)
of the CTS circuit board.
Set the switch S701 to the TEST side and press
the CTS START button.
During its operation, adjust VR501 (L ch) so that
the DC level at TP(L) alternate frequently between
H L or L ->■ H.
3) Connect the oscilloscope to the test point TP(R)
of the CTS circuit board and press the CTS
START button.
During its operation, adjust VR601 (R ch) so that
the DC level at TP(R) alternate frequently be¬
tween H ->■ L or L ->■ H.
4) Set the switch S701 to the AUDIO side.
(2) Checking the CTS Operation
1) Load the LX cassette tape. Light the preset
lamp and set to the preset mode. Record/playback
IkHz and 12kHz signals and note the frequency
response.
2) Press the CTS START button. After it is completed,
(CTS lamp lit), record/playback the IkHz signals and
check to make sure the frequency response is improved
over those recorded in section 1).
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