Tascam M-300 Series, Operation & Maintenance Manual

Page: 78 / 167

1-4.
CHANNEL FADERS AND POTS
I nput Channel Sections of the 300 Series Mixers
are all identical. TAPE I Ns 1 -8 are internally
connected to LINE INs 1 ·8 and disconnected
when 1/4" phone plugs are inserted to Ll NE
I Ns.
1) Channel Faders (INSERT .... D.OUT)
Connect a -10 dBV, 1 kHz signal to the channel
I NSERT jacks and set the channel faders for a
-10 d8V reading at D.OUT. Confirm that
setting of the faders to the shaded area (be·
tween 7-8 on the scale) provides a -1 0 d8V
output.
2) TRIM-LINE Port (LINE I N .... D.OUT)
Connect a -10 dBV, 1 kHz signal to L I N E IN.
Press the LINE switch to select the LINE IN
signal. Adjust the T RIM-LINE pot for a -1 0 dBV
reading at D.OUT.
3)
EQualizer (LINE I N -> D.OUT)
Connect a -10 dBV, 1 kHz signal to L I N E I N
and press the E O O N switch. Read the levels
at D .OUT while turning the GA I N knobs of the
three sections ( H IGH, M I D and LOW). If the
readings vary approx.
±
1 5 dB in regard to a
-10 dBV nominal level, the EO electronics
are considered normal.
4) AUX 1 and AUX 2 Level Pots
(LINE IN -> AUX 1 , AUX 2 OUTPUTs)
Connect a -10 d BV, 1 kHz signal to L I N E I N
and press the AUX 1 LINE switch. Confirm that
AUX
1, 2 O UTPUTs provide nominal levels
(O dBu at 1 /4" phone jacks, -10 dBV at RCA
phono jacks) when the AUX 1 , 2 level pots are
set to the max. position or fully right.
5) E F F ECT Sand Control (LINE IN .... E F F ECT
OUTPUT)
Connect a - 1 0 dBV, 1 kHz signal to the L I N E
I N jacks and press the channel ON switches.
Confirm that setting of the E F F ECT send
control to maximum provides nominal levels to
the E F F ECT OUTPUT (0 dBu at 1/4" phone
jacks, -10 dBV at RCA jacks).
6) TRIM-MIC Pot (MIC IN .... D.OUT)
Disengage the L I N E switch to select the M I C
I N signal. Connect a -60 dBV, 1 kHz signal to
M I C IN and adjust the TR IM-M I C pot for a
-10 dBV reading at D.OUT (TR IM-MIC control
range is 45 d B approx.).
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