Figure 7-19. Hud4022A/Hud4025B Frequency Generation Unit Overall Schematic (Sheet 1 Of 2) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

Schematics, Component Location Diagrams, and Parts Lists: HUD4022A/HUD4025B (VHF) Main Board
RX 3rd Buffer
B(,1),A(,1)
6881096C74-B
SH3752 SH3753 SH3751 SH3750 SH3754
SHIELD SHIELD SHIELD SHIELD SHIELD
1 1 1 1 1
Tx & Rx VCOs Shields
Tx & Rx Buffers Shields
SH3759
SHIELD
1
C3764 100n
NC
D3758
B(,1),A(,1)
B(,1),A(,1) 4 3
A1 K1 NC
0 B(,1),A(,0) 5 2
A2 K2
6 1
C3765 100n B(,1),A(,1)
A3 K3
B(,1),A(,1)
C3763 100n B(,1),A(,1)
D3757
4 3
A1 K1
5 2 B(,1),A(,1)
A2 K2
6 1
B(,1),A(,1) C3767 100n B(,1),A(,1)
A3 K3
R3770
100.
B(,1),A(,1)
NP
R3765 C3833 C3810 C3834 C3812
1.K
100n 100n .047uF .022uF
0 B(,1),A(,0)
R3773
51.
0 B(,1),A(,0)
C3809
5.600n
C3857
C3855 C3860 C3859 C3858 C3856 C3861
100.n 100.n 100.n 100.n 100.n 100.n 100.n
B(,1),A(,1)
1 TP6757
TEST_POINT
Millennium FGU
4
5 3
Q3765
C3774
470.p
1
2
0 B(,1),A(,0)
C3770
470.p
B(,1),A(,1)
NC
0 B(,1),A(,0)
TP6758
TEST_POINT
1
TP6772
TEST_POINT
0 B(,1),A(,0) 1
5 4 3
Q3763
C3776
470.p
C3822
1 2
10uF
B(,1),A(,1)
TP6759
TEST_POINT
1
B(,1),A(,1) 1 TP6760
B(,1),A(,1)
TEST_POINT
5 4 3
Q3766
C3771
470.p
1 2
B(,1),A(,1)
1 TP6761
TEST_POINT
TP6756
TEST_POINT
B(,1),A(,1)
1
TP6762
1
TEST_POINT
Q3764
B(,1),A(,1)
C3772
470.p B(,1),A(,1)
1 2
C3881 C3882 C3883
1
B(,1),A(,1)
100.n 100.n 100.n TP6763
TEST_POINT
NC

Figure 7-19. HUD4022A/HUD4025B Frequency Generation Unit Overall Schematic (Sheet 1 of 2)

B(,1),A(,1)
High_VCO_SW TX_Buffer_EN TX_Buffer_EN
B(,1),A(,1)
Control_V_Tx TX_RF_OUT From_TX_VCO
Prescaler_Inj
Low_VCO_SW
Tx VCO & 1st Buffer
Tx Buffers
F9.3V
B(,1),A(,1)
SWITCHING1 LINE_B+
0 B(,1),A(,0)
Rx_Buffer_2_EN Rx_Buffer_2_EN
B(,1),A(,1)
Control_V_Rx RF_OUT RF_IN
L3776
1.u
Rx Buffer
SWITCHING2
0 B(,1),A(,0) 0 B(,1),A(,0)
Rx VCO & 1st Buffer
R3837
100.
L3750 C3879
NP
1.0u 10.u
B(,1),A(,1)
C3832
470.p
B(,1),A(,1)
R3769 R3880 R3881
1.K 1.K 1.K
C3827
TP6764
R3862
470.p 1
6.2
B(,1),A(,1)
B(,1),A(,1)
R3762
5.6K
C3829
R3861
R3860
470.p
820. B(,1),A(,1) B(,1),A(,1)
820. Q3757
B(,1),A(,1)
R3751
R3766
B(,1),A(,1) 22.
4.7K
7-21
IF6764
K9.1
Keyed_9.1
IF6765
TX_Inj TX_INJ
IF6766
LO_INJ_HS RX_Inj
TO_CAPACITOR
0 B(,1),A(,1)
C3803
470.p
B(,1),A(,1)
C3880
R3829
470.p
68.
0 B(,1),A(,0)
NP
1
TP6765
TEST_POINT
R3771
68.
R3830
R3752 R3772
150.
100. 100.
NP
TP6766
IF6767
Lock_Det
73D02970C73-O
SHEET 12 OF 23
May 25, 2005