Sony STR-DG720 Service Manual ▷ View online
STR-DG720
13
2-6. STANDBY BOARD
screw
(+BVTP
(+BVTP
3
× 8)
CNP901 (3P)
CN4001
STANDBY board
STR-DG720
14
SECTION 3
TEST MODE
AM CHANNEL STEP 9 kHz/10 kHz SELECTION MODE
(US, Canadian model only)
* Either the 9 kHz step or 10 kHz step can be selected for the AM
(US, Canadian model only)
* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
* Procedure:
Turn the [INPUT SELECTOR] control to set AM and press the
[
[
?/1
] button to turn off the main power.
While depressing the [TUNING MODE] button, press the [
?/1
]
button to turn on the main power.
Either the message “9k STEP” or “10k STEP” appears for a mo-
ment and select the desired step.
Either the message “9k STEP” or “10k STEP” appears for a mo-
ment and select the desired step.
VACUUM FLUORESCENT DISPLAY TEST MODE
* All fl uorescent segments are tested.
* All fl uorescent segments are tested.
When this test is activated, all segments light on at the same time,
then each segment lights on one after another.
then each segment lights on one after another.
* Procedure:
While depressing the [TUNING MODE] and the [DISPLAY]
buttons simultaneously, press the [
buttons simultaneously, press the [
?/1
] button to turn on the
main power.
1. ALL segments light on.
2. Turn the [INPUT SELECTOR] control, confi rm display.
3. Turn the [INPUT SELECTOR] control, confi rm display.
4. Turn the [INPUT SELECTOR] control, all segments light off.
SOUND FIELD CLEAR MODE
* The preset sound fi eld is cleared when this mode is activated.
* The preset sound fi eld is cleared when this mode is activated.
Use this mode before returning the product to clients upon com-
pletion of repair.
pletion of repair.
* Procedure:
While depressing the [2CH] button, press the [
?/1
] button to turn
on the main power.
The message “S.F. CLR.” appears for a moment and initialization
is performed.
The message “S.F. CLR.” appears for a moment and initialization
is performed.
SOFTWARE VERSION DISPLAY MODE
* The software version is displayed.
* Procedure:
* The software version is displayed.
* Procedure:
While depressing the [SPEAKERS (OFF/A/B)] and the [DIS-
PLAY] buttons simultaneously, press the [
PLAY] buttons simultaneously, press the [
?/1
] button to turn on
the main power.
The model name, destination and the software version are dis-
played for a moment.
The model name, destination and the software version are dis-
played for a moment.
KEY CHECK MODE
* Button check
* Procedure:
* Button check
* Procedure:
While depressing the [SPEAKERS (OFF/A/B)] and the [2CH]
buttons simultaneously, press the [
buttons simultaneously, press the [
?/1
] button to turn on the
main power.
Either the message “REST 14” appears.
Every pressing of any button other than the [
Either the message “REST 14” appears.
Every pressing of any button other than the [
?/1
] counts down
the buttons. The buttons which are already counted once are not
counted again. When all buttons are pressed “REST 00” ap-
pears.
counted again. When all buttons are pressed “REST 00” ap-
pears.
SWAP ALL MODE
* When this mode is used, output the audio signal of front L/R
* When this mode is used, output the audio signal of front L/R
channel to all channel.
* Procedure:
1. While pressing the [MEMORY/ENTER] and [DISPLAY] but-
1. While pressing the [MEMORY/ENTER] and [DISPLAY] but-
tons, press the [
?/1
] button to turn on the main power.
2. The message “DSP TEST” appears.
3. Press the [AMP MENU] button on the remote commander, and
3. Press the [AMP MENU] button on the remote commander, and
the message “9_DSPTST” appears.
4. Press the [
b] button on the remote commander to enter the
DSP test mode menu.
5. Press the [
v] button on the remote commander twice to enter
the swap mode, and the message “SWP.AUTO” appears.
6. Press the [
b] button on the remote commander twice to select
“SWP.
[]
ALL”.
SHIPMENT MODE
* All preset contents are reset to the default setting.
* Procedure:
1. While depressing the [SPEAKERS (OFF/A/B)] and the [MU-
* All preset contents are reset to the default setting.
* Procedure:
1. While depressing the [SPEAKERS (OFF/A/B)] and the [MU-
SIC] buttons simultaneously, press the power [
?/1
] button to
turn on the main power.
2. “CLEARED” appears and switch off the set.
RE-BOX CLASSIFICATION TEST MODE
* Procedure:
1. While pressing the [MEMORY/ENTER] and the [INPUT
* Procedure:
1. While pressing the [MEMORY/ENTER] and the [INPUT
MODE] buttons simultaneously, press the power [
?/1
] button
to turn on the main power.
2. “R.BOX
[][][]
xxx” appears.
3. xx indicates number of times set powered on.
4. Press any button or power off the set to release test mode.
4. Press any button or power off the set to release test mode.
L
SW
C
R
SL
S
SR
SBL SB SBR
LFE
SP A
NEO:6
COAX
HDMI
DEX
DTS -ES
x
II
PL
RDS ST
CAT
96/24
MONO
D.RANGE
SAT
D D
D D
PL OPT
D D
dB
Hz
k
ft.
m
MHz
MEMORY
SP B
L
R
S
LFE
NEO:6
COAX
HDMI
EX
-ES
x
RDS
MONO
D.RANGE
SAT
k
m
MHz
SP B
SW
C
SL
SR
SBL SB SBR
D
DTS
ST
CAT
D D
PL
D D
dB
Hz
ft.
MEMORY
STR-DG720
15
DCAC FACTORY TEST MODE
DCAC Factory Test mode have two stages:
1. DCAC DSP Data Line Checking
2. DCAC board Checking
DCAC Factory Test mode have two stages:
1. DCAC DSP Data Line Checking
2. DCAC board Checking
Factory Test System Setup
1. When power off:
Press the three buttons [MEMORY/ENTER] + [MOVIE] +
[
[
?/1
].
“DCAC
[]
FTM” appears.
Afterward, press the [TUNING MODE] to start DCAC factory
test mode.
test mode.
1. DCAC DSP Data Line Checking
After press the [TUNING MODE], DCAC Factory test mode will
start, below display will show:
“DCAC
After press the [TUNING MODE], DCAC Factory test mode will
start, below display will show:
“DCAC
[][][]
x”
x=1, 2, 3, 4
If there is error happen, below display will show:
“ERR
[]
SD0x” x=1
t D1501 or R1530 problem
x=2
t D1502 problem
x=3
t D1503 problem
x=4
t D1504 problem
2. DCAC board Checking
Connect front left speaker of the receiver and AUTO CAL micro-
phone. Turn [MASTER VOLUME] jog, there will be test tone
sound output from front left speaker, and the display will change
accordingly.
Connect front left speaker of the receiver and AUTO CAL micro-
phone. Turn [MASTER VOLUME] jog, there will be test tone
sound output from front left speaker, and the display will change
accordingly.
“AD
[]
-
[]
xxx”
xxx=0 to 255 (depends on loudness of test tone)
SECTION 4
FM TUNER CHECK
FM AUTO STOP CHECK
Procedure:
1. Turn on the set.
2. Input the following signal from Signal Generator to FM
1. Turn on the set.
2. Input the following signal from Signal Generator to FM
antenna input directly.
* Carrier Frequency: A=87.5 MHz, B=98 MHz, C=108 MHz
Deviation
Deviation
: 75 kHz
Modulation : 1 kHz
ANT input
ANT input
: 35 dBu (EMF)
Note:
Please use 75 ohm “coaxial cable” to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
Please use 75 ohm “coaxial cable” to connect SG and the set. You
cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with
automatic scanning.
4. Confi rm that input Frequency of A, B and C are detected and
automatic scanning stops.
The stop of automatic scanning means “The station signal is re-
ceived in good condition.”
ceived in good condition.”
DSP Data Line
Check
Start
Pass
Pass
Auto Cal Mic
Check
END
SPK Front Left
DCAC MIC
Receiver
generator
OUT (75
Ω)
set
STR-DG720
16
SECTION 5
DIAGRAMS
• Circuit Boards Location
DIGITAL board
MAIN board
STANDBY board
DCDC CONVERTER board
DCAC board
HEADPHONE board
VIDEO 2 board
POWER board
DISPLAY board
HDMI RE board
VIDEO board
XM board
(US, Canadian
model only)
(US, Canadian
model only)
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