Marantz PMD351 N1B Service Manual page 11

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4.7 REC/PLAYBACK FREQUENCY RESPONSE
ADJUSTMENT
1) Adjust the output level of the audio oscillator to 5.0mV
(-26dB) from the S.R.L. recording condition.
Record 400Hz and 12.5kHz signals with DOLBY OFF.
2) Playback the recorded part and confi rm the level of
differences between 400Hz and 12.5kHz are within ±
1.0dB. If the level difference is out of allowance, adjust
the variable resistor and confi rm the playback level of
rerecording
CH. ADJUSTMENT
L R907
R R908
3) Repeat steps #1 and 2 with High Position and METAL
type tapes for confi rmation.
4.8 REC/PLAYBACK LEVEL ADJUSTMENT
1) Input the 400Hz signal and put the unit into record
mode. Measure the output level to set the reference
level of 0dB.
2) Playback the just recorded part and adjust proper
variable resistor, until the REC/PB levels are within
±0.5dB.
CH. ADJUSTMENT
L RK05
R RK06
3) Repeat steps #1 and 2 with High Position and METAL
type tapes for confi rmation.
4.9 REC/PLAYBACK FREQUENCY RESPONSE
CHECK DOLBY NR
1) Adjust the output level of the audio oscillator to 5.0mV
(-26dB) from the S.R.L. recording condition.
Record the following signals with DOLBY-B ON and
Normal tape at 250Hz, 1kHz, 3kHz, 6.3kHz, 10kHz and
12.5kHz.
2) Playback the just recorded part and confi rm the
difference of levels are within ±1.0dB.
3) Repeat steps #1 and 2, with High Position and METAL
type tapes.
4) Repeat steps #1 and 2, with Dolby-C ON.
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