Panasonic MX-5 & MX-5A Chassis Service Manual


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Panasonic MX-5 & MX-5A Chassis Service Manual

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dahbrown
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May 29, 2007, 4:07 AM

Post #1 of 19 (3303 views)
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Panasonic MX-5 & MX-5A Chassis Service Manual	Can't Post

Hi,
I was wondering if anyone would know where I could obtain a copy of the above service manual. I have purchased a few on line but they are all in Russian.
The TV that I have has a MX-5Z chassis. When I bought the schematic diagram they included one page of the service manual - page 15 of 32 which has the voltage points at the components. This page was titled "MX-5 & MX-5A Service Manual"
I would like to obtain the rest of the manual.
Any ideas?
Thanks - Dave

TV guy 1966
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May 30, 2007, 3:28 AM

Post #2 of 19 (3291 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

Need model# please.

dahbrown
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May 30, 2007, 3:37 AM

Post #3 of 19 (3288 views)
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Re: [TV guy 1966] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

Hi TV-Model is TC-51M02. But the cct diagram that I got form Panasonic had TC-21S85RQ on the bottom of it.
Thanks
Dave

rrobor
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May 30, 2007, 5:09 AM

Post #4 of 19 (3286 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

There is no point in asking for a manual unless you tell us where you are. Im sure I have an MX5A but is it correct for you. Is it Pal, NTSC or Secam, is it BG or D. Does the supply use 110 or 240V.

dahbrown
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May 30, 2007, 5:22 AM

Post #5 of 19 (3285 views)
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Re: [rrobor] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

I am in Australia. 240v, PAL.
The problem is that I have no picture sound. Want to verify the voltage on the HOT (Q551) and the transformer (T552). I suspect that the HOT is shot pulling the voltage down? Possibly the transformer may have caused this?
Thanks

rrobor
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May 30, 2007, 6:40 AM

Post #6 of 19 (3282 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

You have a Pal BG TV, the distributer for the manual will be High Country Data Service, they used to be just outside Sydney, now they are in Kilmore Victoria. Whole thing will be about $16 and I believe $8 P+p. It has a protect diode I believe D820 an R2KS and it has a blue ceramic capacitor that goes short in the line. Your first job is to pull the Line output transitor out and fit a 60W globe in E to C connections. Want High country try http://www.forums.hcsd.com.au/

TV guy 1966
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Jun 1, 2007, 3:22 AM

Post #7 of 19 (3270 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

I ran the Mdl# on the Panasonic service web site and sorry no go here in the states.

dahbrown
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Jun 3, 2007, 2:02 AM

Post #8 of 19 (3260 views)
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Re: [rrobor] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

OK. Finally got around to doing that. 60w globe is connected in place of HOT, across E & C points.
I have checked the HOT and the resistance between B & E is about 45 ohms. Looking at the datasheet this looks to be OK. Across C & E and B & C is an open cct.
So I am guessing that the HOT is OK?
Thanks for your assistance

Dave

techchris
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Jun 3, 2007, 9:07 AM

Post #9 of 19 (3256 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

you didnt say if the light lit or not and what voltage you had on the collector point of the HOT

dahbrown
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Jun 3, 2007, 10:57 AM

Post #10 of 19 (3254 views)
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Re: [techchris] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

Yes, that would be handy!!!!
The light did not glow at all. There was no voltage on the collector to the earth side of capacitor 561, or other earth points.
What can I check next?

techchris
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Jun 3, 2007, 12:19 PM

Post #11 of 19 (3251 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

it looks like the fault is back in the power supply.check all the secondary diodes off the smps transformer for voltages.if none check for short circuits from each cathode to chassis,if ok check for kickstart voltage on the power supply regulator,usually supplied from the rectified HT line through high value resistors to one pin of the regulator.you should have about 120volts,5volts,and one or two other low voltages(approx 25-40) coming out of the power supply.I dont have a circuit so I am guessing these values but it puts you in the right direction.

(This post was edited by techchris on Jun 3, 2007, 12:21 PM)

rrobor
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Jun 4, 2007, 12:17 AM

Post #12 of 19 (3238 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

Does the set have a 5V line, is there a red led lit at the front. Check all the secondary diodes in the piower supply for DC voltage, if you get any at all its liable to be stuck in standby which could be the 5V regulator which has been known to fault in this set. Have you 340V on the mains filter if nothing there the surge resistor may be gone due to the regulator. On no power, take the globe off and measure the resistance there, if zero the protection diode is faulty,do some checks and get back with results.

dahbrown
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Jun 4, 2007, 1:29 AM

Post #13 of 19 (3233 views)
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Re: [rrobor] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

Thanks for the comprehensive checks to perform. Will do them when I get home tonight. I know that when it put the 60w globe in place of the HOT the red LED was lit. I know that before it was intermittent.

rrobor
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Jun 4, 2007, 3:13 AM

Post #14 of 19 (3229 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

When you say the red led was intermittent, did you switch on and it flashed a code for a time. If it did, count the flashes to the long gap. If this is using Philips technology then the set is locked off due to a buss line fault. To explain, the processor sends out a signal which goes through each major IC. If the IC fails the signal stops there, the micro flashes a code on the front led and shuts the set down. The flash code usually relates to the stage, IE 4 flashes Its IC401 which is probably the vertical IC. By having the red led at all suggests the supply primary is functioning, there is feed to the 5V line so look for the 3 pin 5V regulator, or if the set has an Eprom, a small 8 pin chip next to a large processor chip, check for 5V on one of the corner pins. This must be 5V, with perhaps a 2%+- tolerance. If you can find absolutely no fault then replace the vertical IC or check its pins for dry joints.

dahbrown
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Jun 4, 2007, 3:25 AM

Post #15 of 19 (3228 views)
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Re: [rrobor] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

From memory, the LED was either on or off. It would come on during testing one time, then the next time it would not turn on.
Tonight, I will put the HOT back in and test it all again, and take notice of the LED.
Thanks heaps for your patience.

dahbrown
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Jun 4, 2007, 11:57 AM

Post #16 of 19 (3222 views)
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Re: [rrobor] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

I have checked the voltage on the 5V & 8V regulators. With the following suprising results:
IC1202 (5V regulator) 11 VDC input - 4.9VDC output
IC851 (5V regulator) 5VDC i/p - 3.54VDC o/p
IC852 (8V regulator) 5VDC i/p - 3.54VDC o/p
IC802 Should have 140V on pin 1, but has 71VDC
IC451 (Vertical Deflection IC) only has 11.71 for pin 6 (VCC)
T552( HV transformer) Pin 9 & 10 only has 71V, should be 140V
I also resoldered the Vertical IC, made no difference.
Where to from here?

rrobor
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Jun 5, 2007, 3:42 AM

Post #17 of 19 (3210 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

Interesting numbers. Your supply functions and your line stage functions, its just they have no puff. I suspect you dont have any sophisticated tools like a CRO or ESR meter so we have to diagnose with that. OK the mico has 5V and has the set working, that though is a dedicated 5V line and uses little power so all is OK there. The rest of the lines are low, the Vertical IC give you 12V on a line which came from the flyback transformer which tells you the flyback is being driven and can create a field. So you have eliminated the majority of your set, it is the supply. The supply is half working. The likely cause is then Electrolytics, not the small stuff though, the mains filter or the B+ filter would be my bet, next would be a leak in the chopper transformer or some odd ailment causing the drive to be wrong, But go for the filters. If you can check for 340V on the mains filter whilst working.

dahbrown
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Jun 5, 2007, 5:22 AM

Post #18 of 19 (3207 views)
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Re: [rrobor] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

I checked L801, the line filter just after the switch, last night and there was 240V (I assume you meant 240V and not 340?).
I am a bit suspect about T801, which appears to be the main transformer. I spoke with Steve @ highcountry and he does not have the service manual for this model. He says that Panasonic are reluctant to give them out.
So I am working off the schematic. I could send this to you if it would assist. I am not sure what I am supposed to read on the i/p and o/p of T801.
I no longer have a CRO, it too packed up (not having much luck!!!)
I await your next suggestion.

rrobor
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Jun 5, 2007, 8:23 AM

Post #19 of 19 (3200 views)
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Re: [dahbrown] Panasonic MX-5 & MX-5A Chassis Service Manual [In reply to]	Can't Post

You are dealing with mains power, DO NOT ASSUME. I may be an ignorant twit leading you down the garden path. Think and act as that is what I am doing and protect yourself. I say this as, as a young tech I asked someone to pull the mains plug out, I saw a plug pulled and assumed. OOPs wrong plug. These are the laws of electricity, you must know or take precautions because you dont. To return to your subject, your mains voltage is AC, it cycles between -375V and +375V if you fit a bridge across that, the RMS value is somewhere near + or - (dependant on what way you hitch) 340V the AC RMS is approx 250V. So no on your filter capacitor I need over 320V DC. that is not on the chokes that is AC and will be 240V. if you wish me Im @hotmail.com, and guess who. I dont know which state you are in, I could get that schematic in Victoria on Spencer street for a few dollars, Other states Im unsure of. Your model is quite rare try for that for a TC14S15A

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