5
The following alignment procedure may be used in lieu of the one in the Service
Manual.
Test Equipment required:
Audio Signal Generator
Audio VTVM
Oscilloscope or RF VTVM
1.
Preliminary control settings:
Screen grid switch off.
Mode switch to USB.
Comp Level to USB.
Processor SW to Pull "ON".
Meter switch ot "Comp".
Send/Rec switch to "Send" as required when making adjustments.
2.
Apply 1500 Hz audio signal to the mic jack at 10mv level.
Connect RF VTVM or scope to TP-2.
Adjust T-11, 12, 13, for maximum level on the S-meter.
Adjust T-14 for maximum level on scope or VTVM at TP-2.
3.
Turn compression level to min, (CCW).
Reduce audio sig at mic jack to 0.3 mv.
Adjust TC-4 (Freq response for speech processor) so that level at TP-2 is not
changed when changing audio gen from 400 Hz to 2000Hz.
4.
Turn compression level to max, (CW)
Set audio gen to 1500Hz at 0.3 mv.
Adjust TC-3 and VR-6 (carrier bal for speech proc) for maximum level at TP-2.
5.
Set audio gen to 10 mv at 1500Hz
Send/Rec switch to send
Adjust VR-7 (comp level for speech processor) so that the level at TP-2 is not
changed when turning the processor on and off. VR-7 should be adjusted for the
particular microphone the customer will be using with his TS-820.
6.
Finally check for non distortion of signal, and that comp level of 20db can be
obtained at full comp on.
General Notes on TS-820S
Author:
Trio-Kenwood Communication, inc.
Service bulletin no. 21 (25-10-1977)
1.
No output TX: SG switch is "OFF".
2.
No TX, RX or VFO: There is no 9 Pin plug installed.
3.
Low RX Sensitivity, no TX: The transverter switch is"ON."
4.
S Meter full deflection when first turned on: Makesure RF gain is not fully
CCW.
