V-F/V Converter; Phase Circuit - NEC MultiSync 3D JC-1404HME Service Manual

(2-5-3) V-F/V converter
H.SYNC
IC151
V.SYNC µPD78C11
12
>
I-
>::,
u::f:
.::>
6
>0
0
IC152
µPD6336C
D/A
(Fig. 2-5-8) BLOCK DIAGRAM of V. F/V converter
40 50 60
70 80
90 100
V.FREQ (Hz)
(Fig. 2-5-9) Relationship between output voltage and V. Frequency
(2-5-4) H. Phase circuit
1. BLOCK DIAGRAM
+12V
R517
2.2K
DIGITAL
CONTROL
SAWTOOTH OSC.
CIRCUIT
@
>----1------0UTPUT
H.SYNC
R512 R515
10K 1% 10K
©
R514
100
R513
10K
COMP. #1
COMP. #2
(Fig. 2-5-10) BLOCK DIAGRAM of the H. Phase Circuit
-65-
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