Hi. Yesterday receiver ''stuck/freeze'' on ''POWER ON''. Today no display, no blink, only main relay click. All compination enter+power button etc.... doesmt work.
Amp section is perfect.
On IC581 all correct ( i have input 5V/OUTPUT 3.3V)
On D582 /cathode/ i have 2.7v
C333/C506/C552/C606 are good, correct voltages.
I don't have osciloscope to check crystals on processor. May be receiver won't boot firmware...
Can you tell me how continou.
Service manual is too big (32mb) to upload here, here is a link...
coojoe_213
Senior Member
Last Activity: 09-26-2018, 10:19 AM
Joined: 11-14-2015
Location: varna
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Pioneer VSX-1020 won't start /relay click /
Last edited by coojoe_213; 08-02-2018, 09:31 AM. -
Re: Sony Str-Db 840 Completely Dead
I remove IC1206 to check voltages without this chip. When i remove IC1206 relay901 close contacts????
Voltages on IC1206 without IC1206:
1. - 0V
2. - 1.67V
3. - 9.07
4. - GND
5 - 9.36V
6. - 1.82V
7. - 1.51V
8. - 6.85V
What do you think?
Do you know any equavalent on NJM2103? I my country there is no any chip NJM2103.
EDIT: Now /after 20 min/ relay RY901 doesn't close contacts without njm2103Last edited by coojoe_213; 03-13-2018, 08:13 AM. -
Re: Sony Str-Db 840 Completely Dead
I check before 5 days c1218 and R1279, they are fine.
C1223/C1225/C1222/C1224 are SMD elements, and i can't check with my esr meter.Leave a comment:
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Re: Sony Str-Db 840 Completely Dead
2SD1733 is a NPN silicon transistor, not darlingon. You can see your web link / / is wrong. 2sd1733 is not hot, absolutly cold....Leave a comment:
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Re: Sony Str-Db 840 Completely Dead
Q1205 is NOT Darlington...Last edited by coojoe_213; 03-09-2018, 02:02 PM.Leave a comment:
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Re: Sony Str-Db 840 Completely Dead
IC1206 Voltages:
1 - 1.33V
2 - 0.25V
3 - 1.28V
4 - GND
5 - 16.5V
6 - 2.79V
7 - 1.26V
8 - 0.85V /When i press Power button, the voltages on pin 8 are again 0.85v/...Leave a comment:
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Re: Sony Str-Db 840 Completely Dead
I don't have any voltages on +3.3V IC1203 , +5V IC1204 , +5V IC1208 , +5V IC1207. On service manual i will have this voltages when main transofrmer work. Main transformer will work when relay RY901 ''close contacts''.
- On the Base of Q1205 I have 1.28V, emitter 0.78V.
Resistance between GND/Emitter Q1205=8.3Kohm...Leave a comment:
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Re: Sony Str-Db 840 Completely Dead
I replace q1205, but all is the same.Leave a comment:
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Re: Sony Str-Db 840 Completely Dead
I don't think Q1205 is bad. If i have 5v on pin8 ic1206 decided all is normal in proccessor, after that IC1206 switch 6.8v on pin 3Leave a comment:
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Sony Str-Db 840 Completely Dead
Hi everyone. My amp is dead, no std by, no relay click. All fuses is perfect, primary on main transf. is excellent.
On the AC Board, after diode on [B]pin 2 (12V)[/B] i have 16v,[B] pin 3 (P_OFF)[/B][B][/B] i have 12 v, and [B]pin 4 (P.RY)[/B]i have 0V. All diodes, fuses and resistors on AC Board are fine.
On IC1206 (NJM2103) pin 5 i have 16v, but on 8 pin i have 0V.
On Q1205 i don't have 6.8v/6.2v only 16v on the collector.
My question is... in this amp, which parts /elements/ responsible for stand by voltages. I have 0.7v on stand by, but i... -
Denon AVR-1705 no sound
Hi. I have Denon AVR1705, without sound on output terminas and no sound on headphone. I check all voltages and they are normal. +1.2V and +3.3V also normal.
This amp is with Sound Processor build with Mode/Input selector BD3811K1 and i thing the problem is may be on this chip. Do you know some solution on this problem.... -
Re: Tangent Amp - problem with display
This is my display. I thing this is perfect to replace. But i don't know where is the problem..., on backlight or some circuit [url]https://www.aliexpress.com/item/1602-16x2-HD44780-Character-LCD-Display-Module-LCM-BULE-light-GOOD-QUALITY/32661453613.html?spm=2114.search0104.3.9.NMtDOG&ws_ab_test=searchweb0_0,searchweb201602_5_10152_10065_10151_10068_5400011_5430020_5410020_10304_10307_10137_10060_10302_10155_10154_5370011_10056_10055_10054_10059_100031_10099_10103_10102_10052_10053_10142_10107_10050_10051_5380020_10171_5390020_10084_1...Last edited by coojoe_213; 08-16-2017, 06:47 AM.Leave a comment:
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Re: Tangent Amp - problem with display
Yes, i know this link, but the person who mod his amp, doesn't have my problem. I have another question. If bulb on display is blow, can i change or no?...Leave a comment:
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Tangent Amp - problem with display
Hi. I have AMP-50 which work perfect put there is no light on display. There is three regulators for voltage 7805, 7808,7908. On 7805 i have 7.1, on 7808 i have 11.71v, on 7908 i have -12.04v . I see on the display everything but not light. Any suggestion?...Last edited by coojoe_213; 08-15-2017, 12:54 PM. -
Re: Luxman L-111a - Bad sound on left channel
If i remove fuses from right chanell, left chanell i 90% perfect??? May zener diod make a problem?
[url]http://www.audiokarma.org/forums/index.php?threads%2Fluxman-l-114a-overheating.413182%2Fpage-2[/url]Re: Luxman L-111a - Bad sound on lef...2Fpage-2[/url]Leave a comment:
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Re: Samsung LCD TV 8 times blink red diode /wont turn on/
TV work now. Problem: inverter , open F5, short IC.Leave a comment:
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Re: Luxman L-111a - Bad sound on left channel
Yes, i have mono switch, if i push the button mono/stereo situation is same.
I try this one yesterday but no result, same. This amp is without relay....Leave a comment:
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Re: Luxman L-111a - Bad sound on left channel
I replace all caps, the problem is same. I replace also volume potentiometer, same.Leave a comment:
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Re: Samsung LCD TV 8 times blink red diode /wont turn on/
Ok, i remove mc33269-5.0, and when i measure output on 78m09, the situation is the same 1.3v :/.
With ohm meter you can see my pics between gnd and two ceramics caps /100nf/ which connect 78m09 output and mc33269 input is 45-50 ohm....Last edited by coojoe_213; 07-14-2017, 02:33 PM.Leave a comment:
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Re: Samsung LCD TV 8 times blink red diode /wont turn on/
If i remove mc33269-5.0 is it problem, only for test?Leave a comment:
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