Kenwood T-599, Operating Manual

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Kenwood_T-599_bulletin.txt
Service bulletin no. 7 (2-11-1977)
No ALC - Drive 10 meters: Check for loose contact at oscillator wafer on coil
pack.
No TX any band: Check the T1 on generator board (X52-0009-00).
No TX: Bad driver FET Q1 3SK22(GR) on X47-0004-00).
No relay action when TX: Bad Q8 2SA562(Y). When replacing Q8 change resistor R16
to 4.7 ohm.
Rubber belt sliping on drive and load: TKC has Chain Modification Kit.
No drive when shock: Check for loose output terminals af final rotary switch
(S10-1002-05).
No output on any band: Check T2 GEN unit (X42-0009-00).
No TX: Check final relay for burned contacts. (S51-4017-15).
Bias current too high and blows fuse: Check for bad 6-7001A and shorted cathode
resistors 10 ohm.
Cannot neutralize: Make sure shield is properly installed on driver 12BY7.
No output from generator unit (X52-0009-00): Bad Q4 TA7045.
No 9 Volt out at AVR (X43-0010-00): CHeck Q1 2SA606(L).
Low output power: If American 12BY7 is used in driver circuit, this can cause
parasitic oscillation. Please use standard Kenwood replacement tubes.
Blows fuse: Check for shorted electrlytics at power supply (X43-0011-00).
AC hum on SSB transmission: Send for TKC bulletin.
1agina p