[amsat-bb] elev rotor
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)
> 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
> Texas Instruments RC4558 Product Page
> 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?
> Replacement G-5500 Controller from Yaesu USA Parts: $300.00
> Date: Fri, 8 Sep 2017 19:14:23 +0000 (UTC)
> 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