REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday, 9 February 2019

NOKIA - 6230 _ 6320B RH-12_RH-28 _ BLUETOOTH TROUBLESHOOTING _ REPAIR HELP

NOKIA - 6230 _ 6320B RH-12_RH-28 _ BLUETOOTH TROUBLESHOOTING _ Repair Help




BLUETOOTH TROUBLESHOOTING CHART.

Phoenix local mode: Tx data 1 ch. 39 (2441 MHz approx. 1 MHz BW).  BC02 Bluetooth control. Options: Internal gain = 52  Spectrum analyzer: RBW = 500 kHz, VBW = 500 kHz, center = 942 Mhz and span = 20 Mhz



Measure PURX voltage = 1.8 V (N131)

No
BB troubleshooting
Ok


Measure N130 BT supply voltage = 2.8V (C144).

No
Replace N131
Ok


Measure N130 VDD-ANA voltage regulator output = 1.8V (C140)

No
Replace N130
Ok


Measure a) N130 VDD_VCO supply voltage = 1.8V (C137)
b) VDD_MEM supply voltage = 1.8V
c) Rx/Tx supply voltage = 1.8V (C130)

No
Check L133, R132
and L130
Ok


Measure SYSCLK voltage = 550 mVpp (26 MHz) 1.3 VDC (C133).
No
Measure D130 supply voltage = 2,8V
at D130 pin 5

 Not OK

Check L131, L132. If passive components-
OK, replace D130.
Ok


Measure RF level = -15 dBm at a TX_A (C131)
and b) TX_B (C132).

No
Check L131, L132. If passive components
OK, replace N130
Ok


Measure RF level = -18 dBm at Z131 SAW filter input.

No
Check T130 and C130
Ok


Measure RF level = -18 dBm at Z131 SAW filter output
No
Replace Z131