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3-9-3. SIDE TONE Adjustment
Rank:
C
Equipment:
Oscilloscope, Audio generator
To be extended:
AT-88 board
Preparation
• MIC switch/CCU front panel → "CARBON"
Test point:
TP48 (GND: E12)/AT-88 board
Adjustment Procedure
1. Connect audio generator and INCOM connector/CCU
front panel as follows.
2. Adjust the level control of audio generator so that the
audio level of 1 kHz sine-wave at TP45 (GND: E1)/
AT-88 board is 200 mV p-p.
3. When turning 1RV2341 (SIDE TONE)/AT-88 board
fully clockwise 2, check the output level at TP48
(GND: E12)/AT-88 board is 100 ±10 mV p-p.
4. Readjust 1RV2341 (SIDE TONE)/AT-88 board so
that the level at the same test point is 50 ±5 mV p-p.
Notes, this specification is for guidance when mainte-
nance.
Therefore, when intercom system is practically used,
adjust 1RV2341 (SIDE TONE)/AT-88 board to the
preferred level.
CCU-700 A
CCU-700AP
3-9-4. PGM MIX Adjustment
Rank:
C
Equipment:
Oscilloscope, Audio generator
To be extended:
AT-88 board
Test point:
TP48 (GND: E12)/AT-88 board
Adjustment Procedure
1. Feed the 1 kHz sine-wave to pin D68 (X), pin A69 (Y)
and pin B69 (GND)/extension board (AT-88).
...Fig-2 (Refer to 3-1-4. Audio connection.)
2. Adjust the output of audio generator so that the level at
TP44 (GND: E1) on the AT-88 board is 200 mV p-p.
3. When turning 1RV2342 (PGM MIX)/AT-88 board
fully clockwise 2, check the output level at TP48
(GND: E12)/AT-88 board is 200 ±20 mV p-p.
4. Readjust 1RV2342 (PGM MIX)/AT-88 board so that
the level at the same test point is 100 ±10 mV p-p.
Notes, this specification is for guidance when mainte-
nance.
Therefore, when intercom system is practically used, adjust
1RV2342 (PGM MIX)/AT-88 board to the preferred level.
E1000
TP22
TP1001
TP23
S1001
E2
MODE1
MODE2
S1002
TP21
E20
TP45
TP44
TP42
E11
S2491
ENG SELECT
RV2342
S1005
S1004
S2301 S2062
S1003
CCU PAINT
-
5
+12
INCOM
-
12
+5
MIC LEVEL
SELECT
AT
REAR
NORM
NORM
INCOM MIC
MIN
MIN
-
-
CH
1
CH
2 CLEAR
DYNAMIC
ENG
CARBON
PRIVATE
(PANEL SIDE)
AT-88 BOARD (COMPONENT SIDE)
3-9. Intercom System Adjustment
RV2432
RV2310
TP47
S2081
RV2382
E12
TP48
S2061
S2082 S2083
S2341
RV2301
RV2302
TP15
TP13
TP10
TP17
LV1 LV21
RV501
TP12
TP1
TP7
RV401
RV101
TP2
RV301
RV81
TP5
LV81
T501
S301
TP6
T401
RV201
RV61
LV61
TP4
TP16
TP11 TP8
TP14
RV41
LV41
LV101
TP3
E1
S2241
PROD SELECT
TP46
TP43
RV2451
RV2341
RV2452
RV2491
TP40
RV2211
RV2212
RV2241
PGM
ENG
PROD
MIX
RTS
CANCEL
PROD
2W
RTS
2W
SIDE
LEVEL
CANCEL
CANCEL
TONE
2W
2W
CANCEL
LEVEL
3-49
TP9
S201
T201
T301
E10
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