7
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 shield.
28.
Insufficient power out to drive linear amplifier: An increase of 5-7 watts can be
obtained by paralleling R6 on receiver unit with a 47 ohm 2 watt resistor.
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.
TS-820 RIT modification
Author:
Trio-Kenwood Communication, inc.
Service bulletin no. 13 (27-1-1977)
We have had a few reports of the TS-820 RIT tuning being "rubbery". The following
information will solve this.
How to modify:
