Sony STR-K790 Support Question
Sony STR-K790 Support Question
Find answers below for this question about Sony STR-K790 - Lifier.Need a Sony STR-K790 manual? We have 1 online manual for this item!
Question posted by hujcflye on March 26th, 2014
How Do You Remove A Protect Message From Sony Str K790
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Current Answers
Answer #1: Posted by StLFanMan on March 26th, 2014 12:15 PM
StLFanMan
Member since:
August 14th, 2013 Points: 1,576,405
Member since:
August 14th, 2013 Points: 1,576,405
PROTECT or PROTECTOR is flashing in the display of the home audio device.
NOTE: If model-specific information is needed to complete any of these steps, refer to the instruction manual with the product. Manuals are available online through the Manuals/Specs/Warranty link on this page.
If PROTECT or PROTECTOR is flashing in the display of a home audio device such as an A/V receiver, or home theater system (hts), there may be an external speaker issue or connection issue that is triggering the protection circuit. Try following these steps to resolve this issue:
NOTE: Because each of these steps represents a possible solution to this issue, check the A/V receiver status after completing each step.
- If there has been an electrical surge or power outtage, then the internal surge protection inside the home audio device may have been triggered to protect the device from the surge. This is normal. To reset the internal surge protection circuit unplug the AC power cord from the wall for at least 30 minutes.
- Ensure the top of the home audio device has proper ventilation to keep it from overheating. Running the home audio device in a poorly ventilated cabinet can trigger the protection circuit.
- Reduce the volume level. If the impedance of any of the speakers is below the rated impedance range indicated on the rear of the home audio device next to the speaker connections, the home audio device may enter the PROTECT mode. Raising the volume with a low impedance speaker will trigger the protection circuit.
- Turn off the home audio device. Let the home audio device cool down for at least 30 minutes while troubleshooting speaker or speaker connection issues, which can trigger the protection circuit inside the home audio device:
- Disconnect ALL of the speaker wires from the back of the home audio device including the subwoofer.
- Carefully inspect the speaker wire at both ends. Verify that it is tightly twisted and not frayed at all. It only takes one tiny strand of wire to short and cause this error.
- After the home audio device has cooled down, power on the device. If the home audio device operates without displaying any errors then the home audio device is not defective and there is an external speaker issue, which is causing the receiver to protect itself from that condition.
- If the home audio device still displays a PROTECT error or does not turn on, then service will be required. Otherwise, continue troubleshooting with the following steps.
- Connect just the Front A speakers and turn on the home audio device. Turn up the volume and operate the receiver for at least 30 minutes until it completely warms up. If the home audio device operates without displaying a protection error, then slowly continue connecting each additional speaker one by one and test each additional speaker until you determine which speaker/speaker connection is causing the protection error.
If the issue is still unresolved, service may be required.
Related Sony STR-K790 Manual Pages
Service Manual - Page 1
...with no sound output.
SERVICE MANUAL
Ver. 1.1 2007.03
STR-K790
US Model Canadian Model
AEP Model UK Model
• STR-K790 is the tuner and the amplifier section in any AM station,...STEREO/FM-AM RECEIVER
9-887-542-02
2007C16-1 © 2007.03
Sony Corporation
Home Audio Division Published by Sony Techno Create Corporation Depending on next page - General
Power requirements
Area code...
Service Manual - Page 2
STR-K790
Power consumption
Area code
Power consumption
US
210 W
Canadian
290 VA
AEP, UK
220 W
Power consumption ...;F
1.5 kΩ
AC voltmeter (0.75 V)
Earth Ground
Fig. A. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.
Caution: The printed pattern (copper foil) may also be careful!
• Strong...
Service Manual - Page 3
STR-K790
About area codes
The area code of the receiver you purchased is shown on the lower right portion of area code AA only". MODEL IDENTIFICATION - ...
Service Manual - Page 4
...component or a list of the display. M PHONES jack N VIDEO 1 IN/
PORTABLE AUDIO IN/ AUTO CAL MIC jack
Function
Turn to playback.
Turn to select the input source to adjust the volume level of all speakers at the same time.
To connect a portable audio... to a headphone.
- STR-K790
Receiver
Front panel
1 234
?/1
VIDEO 1 IN/ PORTABLE AUDIO IN/
AUTO CAL MIC
DIMMER
SLEEP
2CH
A.F.D.
Service Manual - Page 5
... Front Right Center (monaural) Surround Left Surround Right Surround (monaural or the surround components obtained by Pro Logic processing) Example: Recording format (Front/ Surround): 3/2.1 Sound Field...is output from the SUB WOOFER jack. Lights up when audio signal is input through the COAXIAL jack. Lights up when...STR-K790
About the indicators on presetting radio stations. PLII ;
Service Manual - Page 6
...Connects to the FM wire antenna supplied with this
receiver.
6 AEP, UK models
12
C AUDIO INPUT section
AUDIO IN Connects to a DVD
IN jack
player, etc.
B ANTENNA section
FM ANTENNA jack
AM...IN quality of loud
jack
sound. STR-K790
Rear panel US, Canadian models
12
3
4
DIGITAL OPTICAL
VIDEO 2/ BD IN COAXIAL DVD IN
ANTENNA AM
L
R AUDIO IN AUDIO IN AUDIO IN SA-CD/CD TV SAT
RL...
Service Manual - Page 7
...
g
f
RETURN/EXIT
MENU
TV CH -
STR-K790
Inserting batteries into the remote
Insert two R6...3
4 5 6 7 8 9 q; When you press any of time, remove the batteries to control Sony components as follows.
The buttons are factory assigned to avoid possible damage from battery leakage... the receiver turns on or off the Sony audio/video components that the remote is assigned to direct...
Service Manual - Page 8
STR-K790... or satellite tuner. H*
Press to perform menu operations.
audio settings during recording), or multiple items on the TV screen.
... Name
Function
M MENU
Press to perform menu operations.
disc protection), recorder (e.g. Press TV VOL +/- Press TV CH +/- TUNING...
disc player. (Also starts
recording with components in the forward/backward direction of the DVD...
Service Manual - Page 9
... tuner, CD player, Blu-ray disc player or DVD player.
Therefore, depending on the component, the above explanation is intended to the previous menu or exit the menu while the menu...operate differently than described.
• The VIDEO 3 button on the remote is displayed on the TV screen. STR-K790
Name
Q RETURN/ EXIT O
R V/v/B/b
S DISPLAY
T -/->10/x CLEAR
Function
Press to return to serve ...
Service Manual - Page 10
....
3. FLUORESCENT INDICATOR TUBE TEST MODE All fluorescent segments are displayed.
LFE SP B
x COAX
NEO:6
RDS D.RANGE MONO
k m MHz
4.
Either the message "9 k STEP" or "10 kSTEP" appears. "VACS OFF" appears. (8 second)
10 STR-K790
SECTION 2 TEST MODE
SOUND FIELD CLEAR MODE The preset sound field is cleared when this mode before returning the product...
Service Manual - Page 11
... of the receiver and AUTO CAL microphone. Turn MASTER VOLUME jog, there will be test tone sound output from front left speaker of test tone)
STR-K790
11 "DCAC[]FTM" appears. "AD[]-[]xxx" xxx = 0 to start , below display will change accordingly. DCAC board Checking Connect front left speaker, and the display will...
Service Manual - Page 12
... scan the input FM signal with automatic scanning.
4. Turn the power on. 2. Please use video cable for checking. Set to connect SG and the set. STR-K790
Ver. 1.1
TUNER SECTION [FM Auto Stop Check]
SET
SECTION 3 ELECTRICAL ADJUSTMENT
generator OUT (75 Ω)
Procedure: 1.
Service Manual - Page 13
... Location STANDBY board
POWER board DCAC board
HEADPHONE board DISPLAY board
STR-K790
HDMI SW board (AEP,UK) HDMI BRIDGE board (AEP,UK) DIGITAL board
MAIN board
• Waveforms - Voltage variations may be noted due to waveforms. • Signal path.
Note: The components identified by mark 0 or dotted line with a oscilloscope. • Circled...
Service Manual - Page 15
...
SURROUND
Q708 RELAY
DRIVE
RY701
SPEAKERS IMPEDANCE USE 6-16Ω
TM602(2/2)
CENTER
TM604(2/2)
SUB WOOFER
IC850
2
PROTECT DET
7
POWER AMP -B
+B
-B
FL101 -20V
TUNER +10V RELAY +B AUDIO +7V
AUDIO +5V
AUDIO -7V
Q851,852 -B
SWITCH
D811
Q801 -20V REG
IC1902
3
+10V REG
1
IC821
1
+7V REG...) T902(US,CND)
Q901
RELAY DRIVE
RY901
STR-K790
15
15
4-2. DISPLAY/POWER SECTION -
Service Manual - Page 16
...3
4
5
6
7
8
A
DIGITAL BOARD (SIDE A)
R1943 C1913
B C D E
STR-K790
R1096
FB1350
R1318 C1315 R1321
R1253
FB1306
IC1301
R1313 R1312
R1311
R1555
C1031
FB1310
C1301
R1557
RB1500
... R1128 R1636
R1191
11 1-872-321- (11)
• Semiconductor Location
Ref. No. STR-K790
4-3. PRINTED WIRING BOARD - Location
D1001 B-6 D1109 C-7 D1301 C-3 D1302 C-2
IC1101 D-6 IC1111 C-7 IC1131 E-6 ...
Service Manual - Page 17
...D1502 C-3 D1503 D-3
IC1001 E-3 IC1031 B-7 IC1351 C-2 IC1901 B-7 IC1902 B-5 IC1904 B-6
STR-K790
DIGITAL BOARD (SIDE B)
STANDBY BOARD
C
CNP801
(Page 26)
AM
TUNER
FM 75 ...)
MAIN
G BOARD CNP502 (Page 25)
MAIN
F BOARD CNP501 (Page 25)
17
17
A B C D E F No. 4-4.
STR-K790
8
7
6
5
4
3
2
1
MAIN
D BOARD
CNP504 (Page 25)
DISPLAY
H BOARD
CNS102 (Page 31)
for Circuit Boards Location...
Service Manual - Page 21
4-8. STR-K790
1
2
3
4
5
6
7
8
9
10
11
MAIN BOARD
STANDBY
(3/4)
BOARD
A
CNP504 D
(Page 29)
CNP801 C
(Page 28)
1 +R2 2 STOP 3 STDBY GND 4 +9V (STDBY) 5 PW_RY 6 +R4 7 R4 GND
H/P_RY H/P CTRL C/REAR/... 95 96 98
a1 a2
a5 a4 a6 a3 a7 a8 b8 a9 b1 b2 b3
b5 b4 b6 b7
14
DIGITAL BOARD (5/5)
(Page 22)
STR-K790
21
21 DIGITAL BOARD (4/5) - SCHEMATIC DIAGRAM -
Service Manual - Page 23
4-10. IC5001 IC5002 IC5003 IC5004 IC5005 IC5006
Location
C-3 C-4 C-4 B-4 B-4 C-2
1
F
STR-K790
B199
1-873-511-
23
23
STR-K790 HDMI SW BOARD, HDMI BRIDGE BOARD (AEP, UK only) - • See page 13 for Circuit Boards Location.
:Uses unleaded solder.
1
2
3
4
5
6
7
8
AEP,UK
C5002 C5003 C5004
...
Service Manual - Page 29
...
6.3 Q852 DTA124ESA-TP
6.3
D851 ISS133T-72
C816 10 100V
R854 33k
-5.5
R853 10k
C851 0.1
R855 220k
-5.5
-3.6
-5.5
7
JW607
PROTECT DET
Q851 2SC1815 GR-TPE2 -37
-36.4
-37
R858 470
D852 JW
IC850 NJM4565D
R857 10k
R856 470k
R851 10k
-5.5
1.2
-7
...R
SPEAKERS
IMPEDANCE USE 6-16
SUB WOOFER
D
DIGITAL BOARD
(4/5) CNP506 (Page 21)
No mark:FM
STR-K790
29
29 MAIN BOARD (3/4) -
Service Manual - Page 30
...22k
C614
D602
0.01 1SS133T-72
R616 3.3k
R617 15k
C615
10 50V
R618 22k
R619 22k
4.1 0
Q607 2SC1815 GR-TPE2
AF POWER PROTECT
R609 100
C612
-1
47p
500V
C662 47p 500V -1.1
R659 100
0 Q604
MP1620 -OPY-MK
-37
-37 Q654
MP1620 -OPY-MK
... 0.01
CC12 0.01
CC13 0.01
TM602
FRONT
SPEAKERS
IMPEDANCE USE 6-16
CENTER
No mark:FM
STR-K790
30
30 SCHEMATIC DIAGRAM - STR-K790
Ver. 1.1
4-17.
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