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HCD-EP50
• Waveforms
– MAIN Board –
1 U2 w; (X2)
4 Q31 (Base) (REC (ISS 1) mode)
2.4 Vp-p
13.5 µs
139 ns
2 Q41 (Collector) (REC (ISS 1) mode)
4 Q31 (Base) (REC (ISS 2) mode)
7 Vp-p
13.5 µs
12.5 µs
2 Q41 (Collector) (REC (ISS 2) mode)
5 Q31 (Emitter) (REC (ISS 1) mode)
110 Vp-p
12.5 µs
13.5 µs
3 Q31 (Collector) (REC (ISS 1) mode)
5 Q31 (Emitter) (REC (ISS 2) mode)
10 Vp-p
13.5 µs
12.5 µs
3 Q31 (Collector) (REC (ISS 2) mode)
10 Vp-p
12.5 µs
– DISPLAY Board –
1 IC301 7 (X2)
5.1 Vp-p
3.1 Vp-p
238 ns
2 IC305 qd (XI)
3.1 Vp-p
3.1 Vp-p
231 ns
620 mVp-p
620 mVp-p
28
• IC Block Diagrams
– MAIN Board –
U1 LA1837L
30
29
28
27
26
25
24
23
22
REG
ALC
AM
AM
AM
OSC
MIX
RF. AMP
BUFF
AGC
SD
COMP
AM
DET
IF
AM
AM/FM
S-METER
IF-
FM
S-CURVE
BUFF
S-METER
TUNING
DRIVE
FM
FM
IF
DET
GND
VCC
1
2 3
4
5
6
7
8
9
10
U2 LC72131M-TL-M
20
19
18
17
16
15
14
PHASE
DETECTOR
CHARGE PUMP
POWER
REFERENCE
1/2
UNLOCK
ON
DIVIDER
DETECTOR
RESET
SWALLOW COUNTER
1/16, 1/17 4BITS
12BITS
PROGRAMMABLE
DRIVER
CCB
DATA SHIFT REGISTER LATCH
INTERFACE
1
2 3 4 5
6 7 8 9
10
28
21
20
19
18
17 16
DECODER
ANT 1-BIRDIE
STEREO
SW
STEREO
DRIVE
MUTE
FF
FF
FF
VCO
PILOT
DET
PHASE
DET
12
13
11
14
15
13
12
11
UNIVERSAL
COUNTER
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