Maintenance - Kenwood TS-930S Instruction Manual

Fig. 8-3 Digital display calibration
5. Carrier balance adjustment (Signal unit)
With a 50 © dummy load connected to the ANT terminal,
adjust for maximum output at 14.175 MHz. Reduce mic
gain to zero. Set the transceiver in LSB mode. The power
meter or an oscilloscope will deflegt if the carrier is ug
balanced. To batance the cartier, alt&mately adjust trimmer
TC2 and trimpot VR-21 until the meter indicates minimum,
Switch to USB mode and if the pointer deflects, readjust so
the pointer deflects equally for both LSB and USB.
6. Side tone level adjustment (signal unit}
Adjust VR-32 for your preference.
7. "Buzzer'' level adjustment (Signal unit)
Adjust VR-33 for your preference.
8. Monitor level adjustment (Signal unit)
Adjust VR-34 for your preference.
Side tone level ADJ. VR
"Buzzer level ADJ. VR
Monitor level ADJ. VR
oO >! 3 aie
9. S meter adjustment (Signal unit)
Disconnect the antenna with the transceiver in receive
mode. Zero-point adjustment:
Adjust VR2 for meter pointer zero indication. Hf a standard
signal generator {SSG) is available, adjust VR3 so the
S-metes indicates ""S-9", at 14.175 MHz for A 40 dB
(50 2V) signal.
10. NOTCH adjustment {Signal unit}
Turn the MARKER switch on and tune for zera-beat in the
TUNE mode.
Place the MODE switch to CW and turn the NOTCH switch
on.
Adjust the NOTCH contro! to the 12 o'clock position and
fine tune NOTCH for the notch point.
Adjust VR28 for minimum audio output. Repeat the
NOTCH control and VR28 adjustments several times for
best nuit.
8.3 MAINTENANCE
1. Semiconductors, resistors, and capacitors
Semiconductors are easily destroyed if a circuit is shorted.
Troubleshoot carefully.
2. Fuse
When the fuse blows, there is some cause. Be sure to find
the cause before attempting operation. Use a 6 amp fuse
for the TS-930S, or a 4 A fuse for the TS-930V for 120 V
AC operation. Under no circumstances use a higher
amperage fuse than specified. This can cause extensive
damage. Also, the warranty will be void if an oversized fuse
is used.
3. Fan motor lubrication
Every 6 months apply a drop of light machine oil to the
front and rear fan motor bearings.
. Meter jamp Replacement
. Remove power cabie.
. Remove 8 screws and top cover.
power switch.
5. Replace the lamps in reverse order of disassembly.
rated 12 V, 40 mV.
ons -P
37