From: wa2ise
Newsgroups: rec.radio.amateur.misc

Subject: TS820 service notes

Keywords:troubleshoot

Message-ID: <1991Nov24.170603.29709
Date: 24 Nov 91 17:06:03 GMT

Sender: news
Organization: AT&T Bell Laboratories

Lines:175





copied from packet:

 Msg# TSF  Size #Rd  Date  Time From   MsgID        To

 8167 BF   5681   0 24-Nov 0201 KD2EJ  27231_WB2QJA ALL
General Notes on TS-820S                             10-25-77



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.



5.   If digital display does not count:Make sure DH is not"ON."



6.   If there is no DG display:   Make sure you are not inREMOTE VFO with

no remote VFO attached.



7.   When intermittant in any circuit:



     a.   Check for loose black jumper from point to pointon circuit

board.

     b.   Check for broken foil path.

     c.   Check for component that has been pulled out or

loosely soldered.

     d.   Check for solder splash across foil path.

     e.   Check for loose pins.

     f.   Check for component leads touching to metal IF

cans.

     g.   Check for wire not soldered at function switch orat any switch

or control.

     h.   When checking FET's, check for excessive voltageat can top

usually source, or same G-1, G-2 voltage.

     i.   Check for loose Molex mini connector or any foreign substance on

pins.



8.   Complaint of frequency shift when TX-CW:    This is

normal.  800 Hz.



9.   Not proper PLL action:  Make sure PLL slide switch isin NOR not

TUNE.



10.  Receiver audio self oscillation at high level:   Make sure audio

board mounting screws are tight.





RECEIVER



1.   Low audio output receiver sensitivity and no transmit:-6v supply is

bad.  Q13 on FIX VOX unit.



2.   25 kHz calibrator will not zero:  Add 3 pf in parallel with TC-1 on

the marker unit.



3.   Receiver sensitivity down: Q2 on RF unit.  +9v on PD unit is shorted.

L-6 shorted to ground.



4.   Intermittant receive when moving set.: Check for touching terminals

at final relay socket.



5.   No receiver or digital: 14v wire pinched between DG-1 chassis and

ground.



6.   Receiver sensitivity 40 db down: Check for shorted L8, 1.8 MHz

antenna coil on coil pack.



7.   Adjacent signal interferance:See TKC bulletin.



8.   No receive audio:  Check for shorted TA-7201P module at X49-1080-00.



9.   Poor receive audio:The 100 V AC 120 V taps were miswired.



10.  Receiver doesnt work 20-40:  Check for wafer touch to ground on band

switch.



11.  No DG1, no RX, no TX, no VCO:Bad D1 5 volt zener  on relay unit.



12.  RIT action seems warbly: See TKC bulletin.



13.  Receiver has bad static and is noisy:  Bad C14, C15, tantalum on PD

unit.



14.  VFO frequency shift:    Check for loose tension of VFO tension

spring.



15.  USB/LSB will not work:  Check for loose connection at C18 CAR-1 unit.



16.  Intermittant audio:Check for loose mounting screws on audio board.





TRANSMITTER



1.   Mushy audio on transmit: Mic amps Q20 and Q21 on IF unit are bad.



2.   No 14V supply: Bad bridge diodes D8-D10 on X43-1090- 02.



3.   Intermittant operation of any one band: Check for loosely soldered

Xtals in PD unit.



4.   Mic gain down: Cold solder joint at SSB xtal filter IF unit.



5.   Self oscillation when TX: Bad final tubes.  Burned cathode resistors

10 ohms R2, R3 at final unit.



6.   No VOX operation.  No sidetone:   Burned resistor R12 220 ohms at key

socket.



7.   No USB or LSB: Check CAR1 X1-X2 crystal for cold solder joint on CAR-

1 unit.



8.   No TX:   Check for shorted Q1 and Q8 balanced mixer on RF Unit.



9.   No ALC meter movement: Readjustment of meter amp VR1, VR2 on IF unit.



10.  Intermittant ALC action after peaking drive: One final tube is bad.



11.  Fix lite on when in VFO position: Wire shorted terminals on function

switch.



12.  No loading of TX:  Cold solder joint at relay socket RL1 antenna

relay.



13.  Using Sure 444 speech processor is distorted: See TKC bulletin

regarding 16db pad for mic input.



14.  No relay closure on TX: Q9 on fix Vox unit is bad.



15.  Very low RF output only when using RF speech processor:Bad Q30 on IF

unit.



16.  Low RF output on SSB without RF speech processor: Bad Q20 on X48-

1150-00.



17.  Large audio difference between USb and LSB: realign carrier unit per

TKC specifications.



18.  No loading on 40 meters: Foil path is open on RF coil pack.



19.  No tX when using send switch: Bad R28 1K and Q9 on FIX VOX unit.



20.  Blows fuse: Check for shorted C21, C22 100uf 500v.



21.  No drive, no TX or bias:Open screen resistor R6 470 ohm at rectfier

unit.



22.  VFO intermittant:  Check for cold solder at VFO power plug.



23.  Audio distortion on TX with processor: C96 may be loose on IF board.



24.  Faulty LED indications: Check for loose ground screws on LED board.



25.  Low output on CW: R14 470 Ohm touch to filter case on IF unit.



26.  VOX operation is intermittant: Solder touch VS terminal oand 14v at

X50-11350-00).



27.  Intermittant TX: Make sure ground strap for 12BY7 shield is under the shie

ld.



28.  Insufficient power out to drive linear amplifier: An increase of 5-7 watts

 can



29.  VFO output level is down:    Q2 inside VFO is bad.



30.  No TX or RX on any band.  No VCO output: Q14 on X50-1330-00 is bad.



31.  No TX or RX: Loose contact VFO output terminal on Fix Vox unit.



© 102577TKC

                    Copyrighted Kenwood U.S.A. Corp.

                    Relayed by KD2EJ with permission from Kenwood U.S.A.

------------------------------------------------------------------------

Note:I haven't tried or verified this, proceed at your own risk. WA2ISE





From: wa2ise
Newsgroups: rec.radio.amateur.misc

Subject: TS820 speech processor allignment procedure

Keywords:ts820

Message-ID: <1991Dec1.030349.25950
Date: 1 Dec 91 03:03:49 GMT

Sender: news
Organization: AT&T Bell Laboratories

Lines:53





copied from packet, from kd2ej:

SB-009



TS-820 Speech Processor Alignment                            11-17-76



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.



© 111776TKC

         COPYRIGHTED KENWOOD U.S.A. CORP.

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Note:I haven't tried or verified this, proceed at your own risk. WA2ISE