I finish the repair of my Datron 4700 calibrator. The Datron 4700 is very similar to the Datron 4705, Datron 4708, as well as the Datron 4200A and Datron 4000. I find a couple more problems which the cause of the high voltage output fault and fix them, and then test the resistance and current functions to confirm that they are working correctly. This is Part 4, there are more videos about the repairs so check out the playlist and subscribe to make sure you don't miss them when they are released. Part 1: https://youtu.be/Fvf3GMZI46s Part 2: https://youtu.be/s2plnAavyKY Part 3: https://youtu.be/XK1Sid5pXqY Part 4: https://youtu.be/R7b1J9dplSw 0:00 - Look at what I found... 1:02 - Is there a Pin 12 or not ? 1:39 - Blown thermal fuse on the PA board. 6:26 - Testing Voltage function after Power Amplifier Board repair. 7:26 - Checking for hot spots with a thermal camera. 9:23 - Identifying the remaining faults. 12:14 - General points of interest. 13:30 - Final testing for Voltage function. 14:00 - I fixed the 1000V range. 16:24 - Testing the Resistance function. 18:31 - Testing the Current function. 19:43 - Patreon Supporters: https://defs.link/?u=fcb3a1 ▶ Subscribe: https://defs.link/?u=ffa106 Click the Bell Icon to get notifications about my future videos! *** Affiliate links: (Bookmark and buy using them) *** ▶ Banggood: https://defs.link/?u=5d46ae ▶ Amazon Store: https://www.amazon.com/shop/thedefpomsrepairchannel ▶ ???☕ Merchandise: https://teespring.com/stores/TheDefpom Donate so I can make more videos for you: ▶ Become a Patreon!: https://defs.link/?u=fcb3a1 ▶ Become a YouTube Member: https://www.youtube.com/channel/UCllpBTH26_dAl5tYl7vA1TQ/join ▶ PayPal Donations: https://defs.link/?u=b099ee ▶ My Odysee channel: https://odysee.com/@TheDefpom:fa ▶ My LBRY channel: https://lbry.tv/@TheDefpom:fa ▶ My Bitchute channel: https://www.bitchute.com/channel/TheDefpom/ ▶ My Utreon channel: https://utreon.com/c/TheDefpom ▶ Test Equipment Repair Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE21HOatpZqBT7XPDF-xVgYp ▶ Electronics & Repair Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3HC6pRLVhotWsQbshtmLcw ▶ Review & Teardown Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3BQ0oNHtWTPQ-0QslbrgEb ▶ Electronics Projects Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3scjKfNCTPedENrGu2zViF ▶ My website: https://www.TheDefpom.com ▶ My Twitter: https://www.twitter.com/TheDefpom ▶ My Thingiverse for 3D printed replacement test equipment parts: https://defs.link/?u=0347b1 ==================== My Electronics Tools (video and purchase links) ==================== Boonton ------ 4220. 8210: https://defs.link/?u=e1eddc Datron ------ 1062: https://defs.link/?u=4423e96 4700: ... https://www.youtube.com/watch?v=R7b1J9dplSw

Remember to subscribe ! This is the repair of a Uniden Grant XL (PB-208 PCB, its the same as a President Grant XL) radio I had sent to me, it had some kind of major DC input issue which burnt out the input section, chokes etc. Give this a Thumbs Up if you like it, it helps to grow the channel, also please share the video with your friends to help the channel to grow ! Test equipment appeal: https://www.youtube.com/watch?v=cDFThnxqDWU To donate money to help fund items for the channel please use one of the methods below, cheers ! PayPal Donations: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=SDDYPAS9BJ2CE Patreon: https://www.patreon.com/TheDefpom #ifixstuff #thedefpom #electronicsrepair TheDefpom Merchandise: https://teespring.com/stores/thedefpom ========================================== Some Of My Electronics Tools (video and purchase links) ========================================== Boonton ------ 4220. 8210: https://defs.link/?u=e1eddc Fluke ------ 8842A: 45: https://defs.link/?u=eac51d 343A: https://defs.link/?u=13c93d 5200A: https://defs.link/?u=a43c99 540B: https://defs.link/?u=0c6bd9 893A. A90. HP/Agilent/Keysight ------ 4261A: https://defs.link/?u=07ed95 5005A. 5342A 18GHz: https://defs.link/?u=5f7513 6181B: https://defs.link/?u=b12aef 8012B: https://defs.link/?u=ca5764 8648B: https://defs.link/?u=da52a3 8901B: https://defs.link/?u=535835 DSOX1102G: https://defs.link/?u=a68d39 https://defs.link/?u=12d498 E3646A: https://defs.link/?u=128f4a Marconi ------ 2022D. 2955. TF2103: https://defs.link/?u=61baaa Rohde & Schwarz ------ SMY: https://defs.link/?u=93514b CMU200: https://defs.link/?u=8ccd72 Polarad SPN: https://defs.link/?u=2ead82 Siglent ------ SDM3065X: https://defs.link/?u=1ed0fe https://defs.link/?u=12d498 SDS2102 (hacked to 340MHz): https://defs.link/?u=1ed0fe https://defs.link/?u=12d498 SPL-1008. SDP1168X: https://defs.link/?u=1ed0fe https://defs.link/?u=12d498 SDL1020X-E: https://defs.link/?u=a0eccb Other Equipment ------ KSGER T12 Soldering Iron: https://defs.link/?u=620ace http://defs.link/?u=5c112e Quick 861DW: https://defs.link/?u=138c0f https://defs.link/?u=a3fc81 S-993A: https://defs.link/?u=079677 https://defs.link/?u=e855a0 EEVBlog BM235: https://defs.link/?u=12d498 YR1030 Battery ESR: https://defs.link/?u=c56527 Heathkit IT-12 Signal Tracer. Racal Dana 1992: https://defs.link/?u=8eeeba Bird 43: https://defs.link/?u=4b18f7 Sinadder 3: https://defs.link/?u=2bf1dd Audio Control SA-3050A RTA: https://defs.link/?u=a04df2 Korad KA3305D: https://defs.link/?u=69090a PDVS2mini: https://defs.link/?u=869ba4 Valhalla 2703: https://defs.link/?u=06bcfc Feeltech FY6800: https://defs.link/?u=8b98cd http://defs.link/?u=34d101 Eakins Microscope: https://defs.link/?u=b0278b https://defs.link/?u=2623 ... https://www.youtube.com/watch?v=GgdFe0h-buQ

The first part of the repairs to this Valhalla 2703 AC Voltage Calibrator, I change its operating voltage, and open the case to find out what problems I can discovered by looking over it. I then run through some basic tests to see what problems are present, and find that high voltages cause the unit to go into standby. I also discuss 3D printing new feet and handles for the unit as they are all broken. This was part of a series, see the playlist for the entire series here: https://www.youtube.com/watch?v=zc068_yG-ts&index=3&list=PL2z3V9RkHQE1RIVzzrBfP7L1PLWJcMwXg&t=1044s Remember to subscribe and click the Bell Icon to get notifications! Affiliate links: (buy from them using my links below) Banggood: https://defs.link/?u=5d46ae Give this a Thumbs Up if you like it share the video with your friends, it helps to grow the channel. To help support the channel please use one of the methods below, cheers ! PayPal Donations: https://defs.link/?u=b099ee Become a Patreon! https://defs.link/?u=fcb3a1 Test equipment appeal: https://www.youtube.com/watch?v=cDFThnxqDWU My test equipment replacement part designs on Thingiverse: https://defs.link/?u=0347b1 My website (well, one of them): http://www.TheDefpom.com #ifixstuff #thedefpom #electronicsrepair TheDefpom Merchandise: https://teespring.com/stores/thedefpom ========================================== Some Of My Electronics Tools (video and purchase links) ========================================== Boonton ------ 4220. 8210: https://defs.link/?u=e1eddc Fluke ------ 8842A: 45: https://defs.link/?u=eac51d 343A: https://defs.link/?u=13c93d 5200A: https://defs.link/?u=a43c99 540B: https://defs.link/?u=0c6bd9 893A. A90. HP/Agilent/Keysight ------ 4261A: https://defs.link/?u=07ed95 5005A. 5342A 18GHz: https://defs.link/?u=5f7513 6181B: https://defs.link/?u=b12aef 8012B: https://defs.link/?u=ca5764 8648B: https://defs.link/?u=da52a3 8901B: https://defs.link/?u=535835 DSOX1102G: https://defs.link/?u=a68d39 https://defs.link/?u=12d498 E3646A: https://defs.link/?u=128f4a Marconi ------ 2022D. 2955. TF2103: https://defs.link/?u=61baaa Rohde & Schwarz ------ SMY: https://defs.link/?u=93514b CMU200: https://defs.link/?u=8ccd72 Polarad SPN: https://defs.link/?u=2ead82 Siglent ------ SDM3065X: https://defs.link/?u=1ed0fe https://defs.link/?u=12d498 SDS2102 (hacked to 340MHz): https://defs.link/?u=1ed0fe https://defs.link/?u=12d498 SPL-1008. SDP1168X: https://defs.link/?u=1ed0fe https://defs.link/?u=12d498 SDL1020X-E: https://defs.link/?u=a0eccb Other Equipment ------ KSGER T12 Soldering Iron: https://defs.link/?u=620ace http://defs.link/?u=5c112e Quick 861DW: https://defs.link/?u=138c0f https://defs.link/?u=a3fc81 S-993A: https://defs.link/?u=079677 https://defs.link/?u=e855a0 EEVBlog BM235: https:// ... https://www.youtube.com/watch?v=zc068_yG-ts

00:15 - Dragino LG-02 Lora Gateway: https://defs.link/?u=fd2d2b 03:01 - 50cm 3.5mm TRS Stereo Cable: https://defs.link/?u=b51083 03:22 - 12V Solenoid Water Valve: https://defs.link/?u=e80776 04:30 - MacBook Pro Silicon Keyboard Covers: https://defs.link/?u=e4a791 05:30 - 0.96" SSD1306 I2C OLED Display Modules: https://defs.link/?u=3a99ff 06:00 - MicroSD Card Adaptor for Arduino: https://defs.link/?u=b0c3ae 06:28 - NRF52840 LoRa Modules: https://defs.link/?u=61aed3 06:45 - SX1276 LoRa Modules: https://defs.link/?u=6fac16 07:00 - LoRA Antenna: https://defs.link/?u=46c79e 08:09 - Arduino MEGA 2560: https://defs.link/?u=1ba2fc 08:38 - Waterproof Keyboards: https://defs.link/?u=fca6c7 Subscribe: https://defs.link/?u=ffa106 Click the Bell Icon to get notifications about my future videos! Thumbs Up and Share the video with your friends so they get to see the video too! Affiliate links: (Bookmark and buy using them) Banggood: https://defs.link/?u=5d46ae Amazon Store: https://www.amazon.com/shop/thedefpomsrepairchannel My Merchandise: https://teespring.com/stores/TheDefpom Test Equipment Repair Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE21HOatpZqBT7XPDF-xVgYp Electronics & Repair Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3HC6pRLVhotWsQbshtmLcw Review & Teardown Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3BQ0oNHtWTPQ-0QslbrgEb Mailbag / Postbag Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE1ba-zQlmWqBLqhZPDR6wFj Electronics Projects Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3scjKfNCTPedENrGu2zViF Apple Repair Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE1vu2Hh_8Mg5NhVSWzbPWFD CB & HAM Radio Videos: https://www.youtube.com/playlist?list=PL2z3V9RkHQE3ki74hMMitH9aRlLa9ZgZx Donate so I can make more videos for you: Become a Patreon!: https://defs.link/?u=fcb3a1 PayPal Donations: https://defs.link/?u=b099ee My website: https://www.TheDefpom.com My Twitter: https://www.twitter.com/TheDefpom My Thingiverse for 3D printed replacement test equipment parts: https://defs.link/?u=0347b1 ========================================== Some Of My Electronics Tools (video and purchase links) ========================================== Boonton ------ 4220. 8210: https://defs.link/?u=e1eddc Fluke ------ 8842A: 45: https://defs.link/?u=eac51d 343A: https://defs.link/?u=13c93d 5200A: https://defs.link/?u=a43c99 540B: https://defs.link/?u=0c6bd9 893A. A90. HP/Agilent/Keysight ------ 4261A: https://defs.link/?u=07ed95 5005A. 5342A 18GHz: https://defs.link/?u=5f7513 6181B: https://defs.link/?u=b12aef 8012B: https://defs.link/?u=ca5764 8648B: https://defs.link/?u=da52a3 8901B: https://defs.link/?u=535835 DSOX1102G: https ... https://www.youtube.com/watch?v=FgDgwmMghgQ