Sir . . . Philip I think that if your need for a schematic is still relevant to no sound thru the speaker, maybe this select will suffice. 73's de Edd
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:I'm striking out everywhere. Anyone. Originally I searched for a schematic for a Channel Master cassette recorder model 6305. I contacted Channel Master who said it was discontinued so they don't have any documents. I searched Ebay no luck. I went on google no luck. I contacted Sams. They have schematics for models 6304 and 6306 but no image. It may be that 6304 and 6306 are electrically identical and look similar. I don't want to buy the schematic for either the 6304 or 6306 unless I see the image. So I'll try again. I need the schematic for the Channel Master cassette recorder model 6305 or the images for the 6304 and 6306 or somewhere I can this information or even buy a 6305.
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Sir . . . Philip I think that if your need for a schematic is still relevant to no sound thru the speaker, maybe this info selection will suffice. This is for a pocket radio but should be relevant to your situation of the remoting of the wiring from the PCB proper, over to the units earphone jack. One would have 3 wires remoted from the PCB to the earphone jack. Referring to the speaker and output transformers secondary, there is the need to get interconnection between : 2 going up to 3 4 going up to 5 Common ground junctions 1 & 6 going up to 7. With your reporting of an earphone WORKING, when plugged in would be indicative of the 2 to 3 and 4 to 5, loops and 1+6 to 7 loops being intact. Therefore . . . . . your open circuit must be between 4 to 5 or else that 3-5 pressure leaf switch within the jack being "sprung" open. Clarification . . . The contacts associated with 3 and 5 normally are pressing into each other to provide a normally closed circuit unless one plugs in an earphones mini plug. In that situation, the very tip end of the incoming plug presses 3 contact aside, to open the normal 3-5 connection and relieves your speaker of getting any audio signal. There is then contact of the earphone to 7 and 3 with contact 5 having been pressed aside and its connection having been opened. Soooooooooo . . . . if the earphone is working . . . . suspect the earphone switch or the path from 4 to 5 being open. Quick test: Find the ungrounded 4 terminal on your speaker along with connection 3 of your earphone plug and place a jumper " test wire" between them and expect the speaker to work , IF having a good speaker, but its not working well, if a sugared Coke was spilled into and froze its cone. If your mentioned loose "floating wire" found, was solder tacked onto THE BOTTOM floating islands of solder blobs on the PCB, that may be hard if not impossible to find its ORIGINAL solder point blob. ON THE OTHER HAND, if its connection point was to the TOP of the component side of the PCB, it should have had its OWN dedicated hole to pass thru and then be soldered on the bottom side. If its on the 4 end it should be close to the 4 terminal of the speaker, and a magnifying glass inspection should find that hole with a few strands of broken wire showing. Lets see how you come out now . . . . . 73's de Edd
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:I'm striking out everywhere. Anyone. Originally I searched for a schematic for a Channel Master cassette recorder model 6305. I contacted Channel Master who said it was discontinued so they don't have any documents. I searched Ebay no luck. I went on google no luck. I contacted Sams. They have schematics for models 6304 and 6306 but no image. It may be that 6304 and 6306 are electrically identical and look similar. I don't want to buy the schematic for either the 6304 or 6306 unless I see the image. So I'll try again. I need the schematic for the Channel Master cassette recorder model 6305 or the images for the 6304 and 6306 or somewhere I can this information or even buy a 6305.
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::I'm striking out everywhere. Anyone. Originally I searched for a schematic for a Channel Master cassette recorder model 6305. I contacted Channel Master who said it was discontinued so they don't have any documents. I searched Ebay no luck. I went on google no luck. I contacted Sams. They have schematics for models 6304 and 6306 but no image. It may be that 6304 and 6306 are electrically identical and look similar. I don't want to buy the schematic for either the 6304 or 6306 unless I see the image. So I'll try again. I need the schematic for the Channel Master cassette recorder model 6305 or the images for the 6304 and 6306 or somewhere I can this information or even buy a 6305.
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: : : Hi Ed- Your schematic and directions were helpful. Thank you. Let me bring you up to date. Using you numbers terminal 3 of the earphone jack, is my white wire that according to your schematic is connected to 2 of the transformer secondary. Terminal 5 of the earphone jack is my broken yellow wire. Plugging in the earphone gave me some kind of audio. That was a breakthrough since I didn’t have any audio to begin with. This showed me at least the output stage was at least working in some kind of fashion. Now I had to find the yellow wire terminal on the PCB. My speaker had a brown wire and a black wire. The black wire measured zero ohms to ground. The top of the PCB had an arrangement of 9 solder terminals opposite 9 corresponding terminals for a total of 18 terminals, which had wires and printed circuit conductive paths to various components on the bottom of the PCB. On the pc bottom were 19 corresponding pins. It is a block with a plunger at the end facing the buttons. Empty Brown wire plunger 9 terminals top I think the plunger gets activated when the Record button is pressed. The 3rd terminal top from the left on the block had a brown wire. The 2nd terminal top from the left on the block was empty although it had a solder blob. I disconnected the brown wire from the speaker and checked continuity from the brown speaker wire to the 2 ND from left (empty terminal) and 3rd from left (brown wire). I got zero ohms to both. Apparently there was an internal jumper between 2 & 3. I hooked back the speaker. I took a chance and touched the yellow wire to both 2nd and 3rd terminals. I got some kind of audio the same audio from the earphone. But the audio wasn’t good. I need to do that. So I’m in the process of trying to lift the chassis and exposing the wires. But what could cause the predominant static? Do the heads need to be cleaned? Is a transistor defective? Can I send an audio signal to the arm of the volume control after I somehow disconnect it from the input show anything? Write to you soon. : |
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::I'm striking out everywhere. Anyone. Originally I searched for a schematic for a Channel Master cassette recorder model 6305. I contacted Channel Master who said it was discontinued so they don't have any documents. I searched Ebay no luck. I went on google no luck. I contacted Sams. They have schematics for models 6304 and 6306 but no image. It may be that 6304 and 6306 are electrically identical and look similar. I don't want to buy the schematic for either the 6304 or 6306 unless I see the image. So I'll try again. I need the schematic for the Channel Master cassette recorder model 6305 or the images for the 6304 and 6306 or somewhere I can this information or even buy a 6305.
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:::I'm striking out everywhere. Anyone. Originally I searched for a schematic for a Channel Master cassette recorder model 6305. I contacted Channel Master who said it was discontinued so they don't have any documents. I searched Ebay no luck. I went on google no luck. I contacted Sams. They have schematics for models 6304 and 6306 but no image. It may be that 6304 and 6306 are electrically identical and look similar. I don't want to buy the schematic for either the 6304 or 6306 unless I see the image. So I'll try again. I need the schematic for the Channel Master cassette recorder model 6305 or the images for the 6304 and 6306 or somewhere I can this information or even buy a 6305.
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