Hailing Pony (zener diode identification)?

[12Footer]

Yes, I am STILL futzin-around with that Mitsubishi RP TV. No schematic to be had, but I found the gen purpose diode (NTE116 equiv) on the coax connection board to be shorted, and an open zener diode inline with the tuner module B+ amoung other things on the video board.... It scorched the pcb it got so hot.. Therfore,I am thinkin the tuner is history (no replacement found).
But I figures I could maybee just leave the tuner out of circuit, and just use the TV on line-level video from the sattelite receiver.
Anyhow, this zener does not cross to NTE that I can find.
It has this on it:
9N
30
0
It's a low watt job judging by the size.
Any clues on what it's rating is?

 

[treedancer]

Re: Hailing Pony (zener diode identification)?

here ya go 12 footer
If it got as hot as your stating you might want to take some voltage measurements on the upper side of that board.Sounds to me like there might be a power drain on that side.

NTE116
General Purpose Silicon Rectifier
Description:
The NTE116 is a general purpose silicon rectifier in a DO–41 case designed for low power and switching
applications.
Absolute Maximum Ratings:
Peak Repetitive Reverse Voltage, VRRM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600V
Working Peak Reverse Voltage, VRWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600V
DC Blocking Voltage, VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600V
Non–Repetitive Peak Reverse Voltage (Halfwave, Single Phase, 60Hz), VRSM . . . . . . . . . . . . 720V
RMS Reverse Voltage, VR(RMS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420V
Average Rectified Forward Current. IO
(Single Phase, Resistive Load, 60Hz, TA = +75°C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Non–Repetitive Peak Surge Current, IFSM
(Surge applied at rated load conditions for 1 cycle) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30A
Operating Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +175°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +175°C
Maximum Lead Temperature, TL
(During Soldering, 3/8” from case for 10sec at 5lbs tension) . . . . . . . . . . . . . . . . . . . . . +350°C
Electrical Characteristics:
Parameter Symbol Test Conditions Min Typ Max Unit
Maximum Instantaneous Forward
Voltage Drop
vF iF = 1A, TJ = +25°C – 0.93 1.1 V
Maximum Full–Cycle Average Forward
Voltage Drop
VF(AV) IO = 1A, TL +75°C, 1” leads – – 0.8 V
Maximum Reverse Current IR VRRM = 600V, TJ = +25°C – 0.05 10 ìA
VRRM = 600V, TJ = +100°C – 1.0 50
Maximum Full–Cycle Average Reverse
Current
IR(AV) IO = 1A, TL +75°C, 1” leads – – 30 ìA

heres a link

http://pdf1.alldatasheet.com/datasheet-pdf/view/9401/NTE/NTE116.html

 

[12Footer]

Re: Hailing Pony (zener diode identification)?

Yes, i got the gen purpose changed-out, treedancer, but the other is a zener diode, probably a 1/4 watt, under 12volts (the supply regulator is a 7812 best i can trace-back thru the circuit traces eyeball).
I would guess it's a 9.3volt zener, but i don't trust my guess.

 

[KaGee]

Re: Hailing Pony (zener diode identification)?

Feetz there is no direct cross.

If you knew the voltage and wattage we could maybe find something to work. With those unknown, it's a tough guess.
You might investigate PTS in Bloomington Indiana for the tuner repair.
(NTE Rep for 9 years now)

 

[eurolarva]

Re: Hailing Pony (zener diode identification)?

9N30 crosses over to a 7430 which is an 8 pin nand gate. Are you sure the first number is a 9? Typically a zener is a 1N number.

 

[12Footer]

Re: Hailing Pony (zener diode identification)?

Yes, I'm sure of the number and order. I know they start with 1N, so I even tried to cross it as 1n930 -- I think it came up with NTE177, which isn't even a diode.
I did find a source for a "repair kit" of sorts called a "telematics 2000" kit. It's a symptom-specific kit, so I'm hoping it will give me d-101's value

 

[Pony]

Re: Hailing Pony (zener diode identification)?

Have you called Mitsubishi to see if they can tell you the part numbers for the diode and the tuner? It wuld suck to put the wrong diode in ust to have it avalanche again.......

Plenty of places....including the place kagee mentioned usually have the equipment if you have part numbers.....

 

[12Footer]

Re: Hailing Pony (zener diode identification)?

Thanks, guys. I sure do long for the good ol days when SAMs had the schematics to dang niegh anything, and I had a fully equipped repair shop to play in.

Since about 1990, they've been building and supporting their products to be thrown away in a year.

 

[rwise]

Re: Hailing Pony (zener diode identification)?

them and everybody else, its all about the bottom line!

 

[Pony]

Re: Hailing Pony (zener diode identification)?

planned obsolescence at its finest

 

[Pony]

Re: Hailing Pony (zener diode identification)?

Hey 12.....I sent ya PM.8)