Need Fuse Info re: w2100

[Bosco]

I’m sure this seems like a dumb question, but I need fuse info for my Wur 2100. I’m putting together additional pages for the service manual — pages I can understand at a glance (not good with Schematics). Here’s what I need to know.

What each fuse protects

Which Fuses are slo/blow

A good source for purchasing standby fuses.

Here are the two pix I’m using. Oh, there may a fuse protecting the coin mechanism, but my machine doesn’t have a coin mech. That’s why it’s not pictured.

[Bosco]

Jeez, once again forgot to Sign. Bos or Bosco. One more time and I'm changing it to Bozo.

The attached pix are kinda tough to make out. Here they are in Flickr

flic.kr/p/QNdxpY

[robnyc]

Comments are not enabled in the flickr account so I'll what I can here.

On Amp:

#22 8 amp: Low AC source

#21 15 amp -Main line fuse. Should really be no more than 5 amps

#23 Two 2 amp. One is Low Dc the other is the primary of the second power tran. This is the one that comes on when the relay pulls in.
----------------------------
Junction:
Fustat: Wallbox low AC

14 and 19 are part of the selection system and protect stepper and write-in coil ckts. In later designs they used current limiting bulbs for one function.

Examine the fuses that are there. A fast blow will generally be just a single filament of fuse wire while a delay (slow) will have a spring-like element at one end or be wrapped around a cloth thread.

Any electronics parts house should have the fuses.

RobNYC

[Bosco]

RobNYC

First, If you’re in NYC today I hope you’re staying warm. Thanks for the response. I have a couple of questions.

I assume “Low” refers to low voltage. If so, besides lights what components/circuits use low voltage, either AC or DC?

Can you tell me what’s meant by “write-in coil ckts?”

Ditto “secondary power trans.”

Thanks,
Bosco

[Ron Rich]

Hi Bosco,
"Low" usually refers to around 25 volt--either a,or dc, when speaking "jukeboxease"--but in the case of Seeburg, "L" can refer to 117 vac, vs "H" for 240 vac--
The power to the coils--
2nd side of a power transformer.
Ron Rich

[robnyc]

Nov 16, 2018 16:45:46 GMT Bosco said:

RobNYC

First, If you’re in NYC today I hope you’re staying warm. Thanks for the response. I have a couple of questions.

I assume “Low” refers to low voltage. If so, besides lights what components/circuits use low voltage, either AC or DC?

Can you tell me what’s meant by “write-in coil ckts?”

Ditto “secondary power trans.”

Thanks,
Bosco

Bosco, "low" AC or DC refers to stuff powered by the step-down transformer(s). That is usually decorative lights, indicators, coils & relays along with most motors other than the turntable. In jukeboxes it is almost always in the 24-30 volt range.

"Write-in" refers to the process where a selection is made by customer and committed to some form of memory to await play. On your Wurlitzer that means the pin bank under the mechanism.

The secondary power tran is peculiar to Wurlitzer. Since the amplifiers use tubes and those require some period of warmup it was considered desirable to keep the tube cathode heaters powered even when no one was playing anything. Seeburg and most others applied full 6.3 volts to the heaters. Wurlitzer used a much lower "standby" voltage from the main tran and boosted that to full when the machine started looking for and playing a selection. The main transformer is on at all times so that credit and selections can be made. Once selection is made power is applied to the auxiliary transformer which boost the heaters and adds the high voltages called B+.   The thinking was that tube heaters would last longer if not fully powered. Reality is that the heaters will long outlast the emissivity of the cathodes, IOW: the tube will need to be replaced even when it still glows. Wurlitzer operated by its own rules :-).

If you look at the tubes you'll see them glow brighter when the machine is active vs. standby.

Yeah, the snow was a mess and caught nearly everybody by surprise. Stranded cars and busses (those w/out chains) all over. Today it was sunny and 40's. All traces gone. We had a full house here with friends who live in those dopey suburbs and could not get home. Glad this doesn't happen more than a few times a winter.

Rob

[Bosco]

Thanks to both of you for taking the time. Good info.

Bosco