Can we replace Northstar 467 explorer fishfinder with Northstar 457 fishfinder?

yes you can you need power lead and 12 volt battery

If no number is to be repeated, there are 84 combinations where the order doesn't matter.
123
124
125
126
127
128
129
134
135
136
137
138
139
145
146
147
148
149
156
157
158
159
167
168
169
178
179
189
234
235
236
237
238
239
245
246
247
248
249
256
257
258
259
267
268
269
278
279
289
345
346
347
348
349
356
357
358
359
367
368
369
378
379
389
456
457
458
459
467
468
469
478
479
489
567
568
569
578
579
589
678
679
689
789

If the order matters then there are 504 possibilities. If you're dealing with something like a lock on a suitcase where there are three dials, each with 1 through 9 then there are 729 possibilities ranging from 111 to 999.

From the owners manual (page 78, link below) NMEA out (+) is the white wire and NMEA (-) or ground is the black wire.

-Steve


http://www.northstarnav.ca/upload/Northstar/Documents/EXPLORER_650.pdf

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 211 223 227 229 233 239 241 251 257 263 269 271 277 281 283 293 307 311 313 317 331 337 347 349 353 359 367 373 379 383 389 397 401 409 419 421 431 433 439 443 449 457 461 463 467 479 487 491 499 503 509 521 523 541 547 557 563 569 571 577 587 593 599 601 607 613 617 619 631 641 643 647 653 659 661 673 677 683 691 701 709 719 727 733 739 743 751 757 761 769 773 787 797 809 811 821 823 827 829 839 853 857 859 863 877 881 883 887 907 911 919 929 937 941 947 953 967 971 977 983 991 997

It appears that the back-light, a Cold Cathode Fluorescent Tube about 3mm diameter, is not working.
There are two likely causes.
1. Tube has failed.
2. High Voltage supply circuit has failed.

I'm currently pulling my unit apart to determine the cause. I suspect the tube is the problem but I will post more when I have it apart

Does anyone know what the correct operating voltage of this Cold Cathode Fluorescent Tube is? Northstar could not provide me with a service manual.

The screws are 1/16" or similar Allan Screws (about 1.6mm internal between flats). They usually can be undone with a 1/16 Allan Key but some of the screws can't be unscrewed with this key.

I'm having difficulties uploading the photos at the moment but I will try and fix that.

Check ebay for a new/used cover, or an oem product that will perform the same task. If this doesn't help, check with the company itself, they might have one for sale.

Click on this link to view the operating manual for the Northstar Explorer 550eu GPS Receiver

Heres your belt diagram for the 1993 engine 4.9, i hope this is helpful, good luck.

the northstar 538 does not have an inbuilt aerial (that is the 538i). You need to attach a compatible aerial and then you will be fine.

I have one of these same units brand new for sale real cheap