REPAIRING AND NOT THROWING AWAY

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 !

Monday, 4 February 2019

SILVA SCHNEIDER PCD136 CIRCUIT DIAGRAM – PORTABLE MW-FM RADIO WITH CASSETTE RECORDER

Silva Schneider PCD136 circuit diagram – portable MW-FM radio with cassette recorder

Used ICs: MM1469PH – TA2157F – TC94A29FB-005 – TA2111N – UTC1316 – BA3308
ALIGNMENT PROCEDURES
AM I.F. ALIGNMENT
1. Set the POWER BUTTON to POWER "ON".
2. Set the FUNCTION SELECTOR SWITCH to RADIO & AM BAND.
3. Connect a SWEEPSCOPE OUTPUT to AM antenna terminal.
4. Connect a SWEEPSCOPE INPUT to pin13 or 14 of IC1 through a 1uf capacitor and ground.
AM R.F. ALIGNMENT
1. Connect an RF generator to a standard radiating loop.
2. Connect a SCOPE and VTVM across the speaker output.
FM I.F. ALIGNMENT
1. Set the POWER SWITCH to POWER "ON".
2. Set the FUNCTION SELECTOR to RADIO & FM BAND.
3. Connect a SWEEPSCOPE OUTPUT to pin21 of IC1 through a 20pF capacitor and ground.
4. Connect a SWEEPSCOPE INPUT to pin13 or 14 of IC1 through a 1uf capacitor and ground.
FM R.F. ALIGNMENT
1. Connect an RF generator to the FM antenna terminal and ground.
2. Connect a SCOPE & VTVM across the speaker output.
CASSETTE ALIGNMENT
1. Set the FUNCTION SELECTOR SWITCH TO TAPE.
2. Connect a Scope & VTVM across the speaker output.
3. Insert the 8KHz tape in to cassette deck and push play BUTTON.
4. ADJUST HEAD for speaker maximum output
5. Motor speed adjustment for tape speed.
CD ALIGNMENT
Auto alignment
Exploded view
Circuit diagram
Click on the pictures to magnify
Posted By: FRANK at 05:50
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