Kenwood TM-V71A Service Manual page 18

TM-V71A/V71E
Ref. No. Use / Function
D407,408 Switching
D409,410 Varicap
D412,413 Varicap
D415,416 Varicap
D419~421 Varicap
D423,424 Varicap
D451 Switching
D456 Switching
D457 Switching
D486,487 Switching
D488 Detection
D489 Detection
D546,547 Switching
Reverse current
D576
prevention
Reverse current
D578
prevention
Reverse current
D580
prevention
Reverse current
D582
prevention
Reverse current
D583
prevention
Reverse current
D584
prevention
Reverse current
D606
prevention
D607 Limiter
Reverse current
D608
prevention
18
COMPONENTS DESCRIPTION
Operation / Condition / Compatibility
Local signal switch
(on when B band UHF RX)
Tune the B band UHF BPF
Tune the B band UHF BPF
Tune the B band UHF BPF
Tune the B band UHF BPF
Tune the B band UHF BPF
RF mute
IF switch (on when 1.2G RX)
Local signal switch (on when 1.2G RX)
A band RX ceramic fi lter select
AM AGC voltage detection
AM detection
B band RX ceramic fi lter select
5RA output
5RB output
5RB output
8TV control for A band
8TV control for B band
8TU control
for alignment
Prevention from over level input
for alignment
Ref. No. Use / Function Operation / Condition / Compatibility
D609 Limiter Prevention from over level input
D610,611 Switching Protection from surge input
D612 Surge absorber Protection from surge input
D701 Switching UHF VCO shift
D703 Varicap UHF VCO tune
D704 Varicap VHF VCO tune
D705 Varicap UHF VCO tune
D707 Varicap VHF VCO tune
D708 Switching VHF VCO shift
D709 Varicap for VHF VCO modulation
D710 Varicap for UHF VCO modulation
D751 Switching UHF VCO shift
D753 Varicap UHF VCO tune
D754 Varicap VHF VCO tune
D755 Varicap UHF VCO tune
D757 Varicap VHF VCO tune
D758 Switching VHF VCO shift
D759 Varicap for VHF VCO modulation
D760 Varicap for UHF VCO modulation
D801,802 Switching MIC mute
D916 18V Zener diode Over voltage prevention
D951~953 Limiter Protection from surge input
Reverse current
D954 8C
prevention
D955 5.1V Zener diode Over voltage prevention
D956 Poly-switch Current limit
Reverse current
D957 5M
prevention