HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: smitty3855
New Today: 0
New Yesterday: 2
Overall: 12622

People Online:
Members: 0
Visitors: 453
BOT: 3
Total: 456
Who Is Where:
 Visitors:
01: Home
02: Forums
03: Forums
04: Forums
05: Your Account
06: Forums
07: Forums
08: Forums
09: Home
10: Home
11: Forums
12: Forums
13: Your Account
14: Forums
15: Photo Albums
16: Your Account
17: Forums
18: Forums
19: Home
20: Forums
21: Home
22: Home
23: Forums
24: Forums
25: Forums
26: Home
27: Forums
28: Home
29: Forums
30: Photo Albums
31: Home
32: Forums
33: Home
34: Home
35: Home
36: Home
37: Your Account
38: Home
39: News
40: Forums
41: Forums
42: Your Account
43: News
44: Forums
45: Forums
46: Your Account
47: Forums
48: Home
49: Your Account
50: Home
51: Forums
52: Home
53: Your Account
54: Home
55: Home
56: Your Account
57: Reloading Database
58: Home
59: Your Account
60: Forums
61: Home
62: Home
63: Forums
64: Photo Albums
65: Forums
66: Your Account
67: Forums
68: Your Account
69: Forums
70: Forums
71: Forums
72: Photo Albums
73: Forums
74: Forums
75: Forums
76: Your Account
77: Your Account
78: Home
79: Your Account
80: Home
81: Home
82: Home
83: Home
84: Forums
85: Your Account
86: Forums
87: News
88: Home
89: News
90: Home
91: Home
92: Home
93: Forums
94: Forums
95: Home
96: Home
97: Home
98: Photo Albums
99: Photo Albums
100: Home
101: Forums
102: Forums
103: Home
104: Home
105: Home
106: Forums
107: Your Account
108: Forums
109: Forums
110: Home
111: Your Account
112: Your Account
113: Forums
114: Forums
115: Forums
116: Photo Albums
117: Forums
118: Forums
119: Forums
120: Home
121: Your Account
122: Forums
123: Forums
124: Home
125: Forums
126: Home
127: Forums
128: Your Account
129: Home
130: Forums
131: Photo Albums
132: Your Account
133: Forums
134: Forums
135: Your Account
136: Your Account
137: Your Account
138: Home
139: Forums
140: Home
141: Forums
142: Home
143: Home
144: News
145: Your Account
146: Home
147: Your Account
148: Your Account
149: Home
150: Home
151: Forums
152: Forums
153: Forums
154: Forums
155: Forums
156: Your Account
157: Photo Albums
158: Forums
159: Forums
160: Your Account
161: Forums
162: Forums
163: Forums
164: Home
165: Forums
166: Forums
167: Your Account
168: News
169: Your Account
170: News
171: Articles: Submit New
172: Home
173: Forums
174: Forums
175: Forums
176: Forums
177: Forums
178: Forums
179: Forums
180: Forums
181: Forums
182: Forums
183: Home
184: Forums
185: Forums
186: Your Account
187: Forums
188: Home
189: Home
190: Forums
191: Forums
192: Forums
193: Home
194: Home
195: Forums
196: Forums
197: Forums
198: Forums
199: Forums
200: Forums
201: Forums
202: Forums
203: Forums
204: Forums
205: Home
206: Your Account
207: Your Account
208: Forums
209: Home
210: Your Account
211: News
212: Home
213: Home
214: Forums
215: Forums
216: Your Account
217: Home
218: Home
219: Your Account
220: Home
221: Forums
222: Forums
223: Forums
224: Forums
225: Home
226: Forums
227: Your Account
228: Your Account
229: Forums
230: Tell a Friend
231: Home
232: Forums
233: Forums
234: Forums
235: Forums
236: Home
237: Home
238: Home
239: Your Account
240: News
241: Forums
242: Forums
243: Your Account
244: Home
245: Photo Albums
246: Home
247: Home
248: Forums
249: Forums
250: Home
251: Forums
252: Forums
253: Forums
254: Forums
255: Photo Albums
256: Home
257: Forums
258: Home
259: Forums
260: Forums
261: News
262: Home
263: Forums
264: Home
265: Forums
266: Home
267: Forums
268: Your Account
269: Home
270: Your Account
271: Forums
272: Your Account
273: Home
274: Forums
275: Forums
276: Home
277: Home
278: Forums
279: Home
280: Forums
281: Forums
282: Forums
283: Forums
284: Home
285: Photo Albums
286: Forums
287: Forums
288: News
289: Home
290: Forums
291: Home
292: Home
293: Forums
294: Home
295: Forums
296: Home
297: Forums
298: Forums
299: Forums
300: Forums
301: Forums
302: Home
303: News
304: Home
305: Forums
306: Your Account
307: Forums
308: Forums
309: Forums
310: Forums
311: Home
312: News
313: Photo Albums
314: Forums
315: Your Account
316: Forums
317: Home
318: Forums
319: Forums
320: Forums
321: PointBlank Online
322: Forums
323: News
324: Forums
325: Home
326: Forums
327: Home
328: News
329: Home
330: Your Account
331: Forums
332: Your Account
333: Forums
334: Photo Albums
335: Forums
336: Home
337: Your Account
338: Home
339: Home
340: Home
341: Forums
342: Home
343: Forums
344: Home
345: Forums
346: News
347: Home
348: Home
349: Forums
350: Forums
351: Forums
352: Home
353: Your Account
354: Forums
355: Forums
356: Forums
357: Forums
358: Forums
359: Forums
360: Home
361: Home
362: Your Account
363: Forums
364: Forums
365: Home
366: Photo Albums
367: Forums
368: Forums
369: Forums
370: Forums
371: Forums
372: Home
373: Forums
374: Forums
375: Forums
376: Forums
377: Forums
378: Forums
379: Forums
380: Your Account
381: Home
382: Forums
383: Forums
384: Home
385: Your Account
386: News
387: Forums
388: Forums
389: Forums
390: Home
391: Forums
392: Forums
393: Forums
394: Photo Albums
395: Home
396: Forums
397: Forums
398: Your Account
399: Forums
400: Your Account
401: Forums
402: Home
403: Home
404: Forums
405: Forums
406: Home
407: Home
408: Forums
409: Forums
410: Home
411: Photo Albums
412: Home
413: Treasury
414: Home
415: Home
416: Forums
417: Forums
418: Your Account
419: Forums
420: Home
421: Forums
422: Forums
423: Forums
424: Forums
425: News
426: Forums
427: Forums
428: Forums
429: News
430: Forums
431: Forums
432: Home
433: Forums
434: Photo Albums
435: Home
436: Forums
437: Forums
438: Forums
439: Forums
440: Forums
441: Photo Albums
442: Forums
443: Forums
444: Your Account
445: Your Account
446: News
447: Forums
448: Forums
449: Forums
450: News
451: Home
452: Forums
453: Home
  BOT:
01: Forums
02: Forums
03: Forums

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 305
 Pictures: 2361
  · Views: 440106
  · Votes: 1310
  · Comments: 86
 

Support our Advertisers

RCBS ammoMaster Chrono repair.
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Reloading Ammunition

View previous topic :: View next topic  
Author Message
gelandangan
Super Member
Super Member


Joined: May 07, 2006
Posts: 5871
Location: Sydney Australia

PostPosted: Sun Feb 23, 2014 7:38 pm    Post subject: RCBS ammoMaster Chrono repair. Reply with quote

Got a mate in real distress.
His RCBS chrono died out of a sudden, when he need to check his load for an IPSC comp.
The unit he brought the unit to me it is dead as door post.
A quick test on the power input show that there is a short circuit in the unit somewhere.
So, I opened the damned thing.



Opening the unit, my first impression is that it is definitely very cheaply made.
Absolutely do not worth the price tag.
It is a PCboard within cheap plastic enclosure shaped in fancy bullet style .
The buttons are membrane type which are good only for a short amount of push, and the membrane switch is GLUED on to the cheap plastic, thus made it not repair friendly.

First scanning for the obvious problem such as corrosion, dirt accumulated between pins or other usual problems.
Nope, beside some oxidized lacquer near the PCB, the whole board looks Ok.

Here are the pictures of the board front and back




And here are pictures of the Piece of S membrane switch.

[


_________________
A straight line is the shortest distance between two points.
A smile is the shortest distance between two people.

The government I trust .. is my .45-70 Government.

Do - Not try!


gelandangan.weebly.com/


Last edited by gelandangan on Sun Feb 23, 2014 7:54 pm; edited 1 time in total
Back to top
View user's profile Visit poster's website
gelandangan
Super Member
Super Member


Joined: May 07, 2006
Posts: 5871
Location: Sydney Australia

PostPosted: Sun Feb 23, 2014 7:53 pm    Post subject: Re: RCBS ammoMaster Chrono repair. Reply with quote

Using my lab power supply I try to power up the unit and it swallowed up a whooping 6 Amps 9 volt (almost 60 WATTS !!) onto the board Shocked
My hands bangs on to the table trying as fast as possible to remove the power. Ouch!

Next touching each of the power device with temperature probe to find where the 60 watts is sinking to, I found that the large MOSFET (AMP3095P) near the power input is heated up.
This mosfet is rated 30V/6A, I wonder why in the world you would need such a large MOSFET in a small battery operated device?
I digress..

So hooking up my scope, I isolate and test trigger the mosfet, and it works Ok. Hmmm..
Lets test the ESR of the accompanying capacitor.. and AHA!!
The goddam capacitor shorted down to 2 ohm.



So I replaced the capacitor and now the unit works again.

All in all it is a simple repair, but for the price you paid for the piece of crap chrono, you would expect the company uses better rated parts.

My suggestion if you want to buy one of these, you will be much better off buying a Chrony instead.

_________________
A straight line is the shortest distance between two points.
A smile is the shortest distance between two people.

The government I trust .. is my .45-70 Government.

Do - Not try!


gelandangan.weebly.com/
Back to top
View user's profile Visit poster's website
Pumpkinslinger
Super Member
Super Member


Joined: Sep 22, 2007
Posts: 4489
Location: NC foothills

PostPosted: Sun Feb 23, 2014 11:05 pm    Post subject: Re: RCBS ammoMaster Chrono repair. Reply with quote

Good info Gelan, thanks!

_________________
Mike

"I ain't no better than anyone else, and there ain't no one better than me!" Ma Kettle

Back to top
View user's profile AIM Address Yahoo Messenger Photo Gallery
Vince
Super Member
Super Member


Joined: May 25, 2005
Posts: 13632
Location: Brisbane AUSTRALIA

PostPosted: Mon Feb 24, 2014 5:53 am    Post subject: Re: RCBS ammoMaster Chrono repair. Reply with quote

That's good to know Gelan...thanks for that mate. I have looked at these units in the past and thought they looked a little too "gimmicky" for me...now it seems that they are cheap and nasty inside as well.

_________________
Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
Back to top
View user's profile AIM Address MSN Messenger Yahoo Messenger Photo Gallery
dhc4ever
Super Member
Super Member


Joined: May 26, 2011
Posts: 2360
Location: Ipswich, Queensland Australia

PostPosted: Mon Feb 24, 2014 12:43 pm    Post subject: Re: RCBS ammoMaster Chrono repair. Reply with quote

My club has a dead one of these sitting in the corner, didnt last long at all.
My first question was why didnt we just buy another chrony, cost less and seem to last quite well until you shoot them.

_________________
Pete

Dont do anything you wont like explaining to the paramedics..............
Back to top
View user's profile
gelandangan
Super Member
Super Member


Joined: May 07, 2006
Posts: 5871
Location: Sydney Australia

PostPosted: Mon Feb 24, 2014 4:38 pm    Post subject: Re: RCBS ammoMaster Chrono repair. Reply with quote

I read on the web that there are a lot of these units gone dead within a few weeks off the warranty.
I guess most of them are having similar issues.

_________________
A straight line is the shortest distance between two points.
A smile is the shortest distance between two people.

The government I trust .. is my .45-70 Government.

Do - Not try!


gelandangan.weebly.com/
Back to top
View user's profile Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Reloading Ammunition
Page 1 of 1
All times are GMT - 7 Hours



Jump to:  


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Advertisements
 


Valid CSS! Valid HTML 4.01!
Click to check if this page is realy HTML 4.01 compliant for speed :)

All logos and trademarks in this site are property of HuntingNut.com.
The comments are property of their posters, all the rest © 2011 by HuntingNut.com
Interactive software released under GNU GPL, Code Credits, Privacy Policy

.: Upgraded to DragonFly 9.2 by Dizfunkshunal :.