Marantz 3800 - Page 26

O dB
—10 dB
—20 dB
—30 dB
-40 dB
(3)
for O VU indication on the Dolby
VU Meter (corresponds to 6.3 V rms
at PREAMP OUTPUT Jack).
(c)
Check
frequency
response
at
oscil-
lator
frequencies
from
20
Hz
to
15
kHz.
Response
should
be
flat
(+
1.5
dB).
(d) Reset oscillator frequency to 5 kHz
and observe the output level. Level
should drop 9-dB (+ 2 dB) or to an
output level between 56 mV and
70 mV rms.
(e) Reset oscillator trequency to 100 Hz
and lower the signal level by 30 dB
and lower the signal level by 30 dB to
an output of approximately 200 mV
rms as measured at the PREAMP
OUTPUT Jack.
For encode/decode back-to-back frequen-
cy response:
(a) Ensure all controls except Dolby
| eel ee ae
i a A A Ga —— a aos Ona Fea COS Lt
pa
Figure 2-9 Dolby Frequency Response, Encode Mode
Switch and RECORD LEVEL Con-
trols are set, as listed in Paragraph 3D.
Reset DOLBY Switch to REC !,and
turn RECORD LEVEL Controls fully
clockwise.
{(b) Apply a 100 Hz signal to AUX
INPUT Jack and adjust the amplitude
for 580 mV rms as measured at the
TAPE | OUTPUT Jack.
(c) Connect a short patch cord (RCA
phono plug on both ends) between
the TAPE | INPUT and the TAPE 2
OUTPUT Jacks.
(d) Reset the TAPE MONITOR Switch
to TAPE | and adjust the PLAY (AL
Controls for 0 VU indication onthe
Dolby VU Meter.
(e) Observe output at PREAMP QUT-
PUT Jack for a measurement of
approximately 6.3V.
(f) Check frequency response at cscil-
lator frequencies from 20 Hz to 15
kHz. Response should be fla (+
2 dB).
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