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sb060.doc
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1990-10-14
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53 lines
SB-060
TS-120 Repair Notes 12-18-79
Symptom Repair
No CW, No Audio Sidetone oscillator Q25 on AF GEN unit 2SC1815
Receiver Sens Down T1, L34--696-35 on RF unit Shorted
Analog Dial Cal OFF Mechanical Adjustment
Carrier in SSB RF unit D2 and D3 shorted see TKC Service Bulletin
Loss of Digital Check P5/J5 on Carrier Unit
Smoke at Final Unit Check for long eds of wire shorted to case inside
final unit also burned L10 and L11, L40-1011-04
(100uH)
SSB Audio bad IF shift control turned max CW
Power on Meter Max The RF gain control was turned max CCW
VFO freq drift Replace the TEMP comp CAP C17
TX Audio BAD Check the Carrier Point adjust and make sure final
bias is set to 150 Ma
PLL digital NG Check D15 PLL unit
High IC in RX Check the Final transistors
15 Meters only The BCD rotary band switch has a broken wafer.
RX TX only 10M The BCD divider Q16, 74LS163 on PLL unit bad.
Check the BCD inputs against the pin 2 frequency.
28.5 HF Osc Check ground screws and tighten at Relay Unit X41-
1250
No CW Filter Solder short across pins 1-2 J29 IF Unit
No RX After the CW filter was installed the pins were
not cut off shorting the signal to ground.
Analog dial off Perform VFO tracking adjustment at 50 and 450
TX out 40M only 40M 50W and 10M 10W bad finals
No 15M Core on the VCO transformer for 15M broken
3.5 and 7 Band same Shorted trace at Band switch under IF unit
Low RF out All bands, Q12 SN16913 on AF gen unit, 2SK19GR bad
No TX all bands L25 open on the RF unit Small gree inductor
No digital no TX Q12 mixer on the PLL unit bad
No RX no digital Q26 mixer on PLL unit bad
INtermitt SSB AUdio Pin 5 of J5 on AF GEN unit loose
No key or TX D26 and Q24 2SA562 on AF gen unit bad
No TX R8 220 ohm at key jack burned open. Make sure
customer uses shielded line on CW KEY.
15M osc. On 15M band only with antenna HF oscillation when
first speaking. Install Ferrite bead on base of
first mic amp Q18 AF GEN UNIT.
No TX Loss of AVB Voltage at RF unit. Check Q9 2SA473
on the filter unit, also check 6 volt Zener diode.
JEB/yn
(c) 8979TKC