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3-7 (E)
HDCU-900 MM
3-2-4. PGM Mix Level Adjustment
Measures : Oscilloscope, Audio oscillator
Note
This adjustment is described on the premise that the output
impedance of the audio oscillator is 600 Z.
Preparation
Board extension : AT-141 board (front side)
Adjustment Procedure
1. Input a sine wave of 1 kHz, 2.2 V p-p (0 dBu) from the
audio oscillator to C77-pin (X), D77-pin (Y) and D76-
pin (G) on the extension board of the AT-141 board.
2. Measuring points : TP504 (M-4)/AT-141 or 4-pin (X)/
INTERCOM connector, 3-pin (G)/
HDCU front panel
Adjusting point : 1RV501 (PGM MIX)/AT-141
board panel side
Specifications : A = 100 ±20 mV p-p
n
These specifications are set for service. When using this
unit, adjust the level to suit the user.
AT-141 board (A side and panel side)
A
S404
TP405
TP502
TP402
TP613TP608
TP401
S504
S603
S126S602
S601
RV501
RV502
RV506
RV505
RV405
S503
TP503
TP504
S41 S403
S128
1
1
11
1
1
1
A
B
C
D
E
F
G
H
J
K
L
M
123456789
AT
POWER
/1.001
FINE
HD BB
REMOTE LOCAL
REFERENCE H PHASE
MIC LEVEL
REF
IN
GEN
LOCK
NORM
MIN MIN
12
ENG PROD
PRIVATE
NORM
INCOM
SELECT
TALK
LEVEL
PGM
MIX
SIDE
TONE
2 WIRE
CANCEL
CH-1 CH-2
CCU
S401
S402
RV402
1
RV604
1
RV603
1
RV605
1
RV602
RV401
S102
S110
S101
3-2. Audio System Adjustment
600 Z
Audio oscillator
GND GND
Y
X