[amsat-bb] elev rotor

Gregory Beat w9gb at icloud.com
Fri Sep 8 20:48:40 UTC 2017

Noticed differences in Yaesu G-5500 schematic notation.
From the 1998 version:
The 1S1588 diode references should be: D15, D17, D19, and D21

D14, D16, D18, D20 are 1N4002 diodes across the relay coils (RY-x).

Sent from iPad Air

> On Sep 8, 2017, at 3:31 PM, Gregory Beat <w9gb at icloud.com> wrote:
> Yaesu G-5500 AZ-EL Rotator manual (schematic LAST PAGE)
> http://www.radiomanual.info/schemi/ACC_rotator/Yaesu_G-5500_user.pdf
> Look at the Yaesu G-5500 Schematic diagram, to start your Troubleshooting.
> Parts readily available from Yaesu USA or Electronics Distributors (Digi-Key, Mouser).
> UNPLUG Rotator Controller from AC Line Voltage, before Opening Case.
> Have your bench DVM/VOM for testing Diodes within unit.
> 1. Failure [open] of the Toshiba 1S1588 diodes (D14, D16, D18, D20, D21) would cause remote control failures -- via DIN 8-pin connector.
> 2.) The Texas Instruments RC4558, Dual General-Purpose Operational Amplifier, is active component (Q3 and Q4) for Analog Meter operation.  May have damaged a section of that IC.
> ==
> Toshiba was OEM supplier to Yaesu.  
> 1S1588 is a silicon diode, U = 35V, I = 120mA, applications: fast switch
> EIC 1S1588 Data-sheet, High Speed Switching Diode, DO-35 Glass Case, ~35 V
> http://www.eicsemi.com/DataSheet/1S1588.PDF
> Texas Instruments RC4558 Product Page
> http://www.ti.com/product/RC4558
> The RC4558 device is a dual general-purpose operational amplifier, with each half electrically similar to the µA741, except that offset null capability is not provided.
> Appears you had an ESD event.  Lightning strike nearby?
> http://www.sunsunsun.net/kd4app/amsat/g5500.htm
> Replacement G-5500 Controller from Yaesu USA Parts: $300.00
> http://www.yaesu.com/?cmd=contactus
> greg
> w9gb
> ===
> Date: Fri, 8 Sep 2017 19:14:23 +0000 (UTC)
> Hello,
> My Yaesu G-5500 works only manually for Azimuth & Elevation
> 1.) No meter indication on Elevation. 
> 2.) No computer control using SATPC32 application.
> Ideas for troubleshooting ? 
> 73 Bob W7LRD 
> --

More information about the AMSAT-BB mailing list