8.3.7HF Path
Description
The
another amplification and filtering circuit. The filtering again is controlled by the S1 and S2 lines, dependant on whether the disc starts up (speed n=1, S1 and S2 Low), disc plays at speed n=1 (S1 Low, S2 High) or disc plays at speed n=2 (S1 and S2 High).
DUAL 4 CHANNEL | |
| MUX/DEMUX |
n=1 AMP |
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3173 | 3174 |
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430R | 430R | 2140 | 180p |
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| HFGND | |
F157 | 2143 |
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| 330p |
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2 |
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n=2 AMP |
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E AMP |
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3191 | 3192 |
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430R | 430R | 2162 | 100p |
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| 2164 | HFGND | |
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| 180p |
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| +5VHF |
| +5VHF |
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| 7025 | ||||
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| 2130 |
| 16 | 74HCT4052D | |||
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| HFGND |
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| VCC |
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| 0 | |
| 3169 |
| 100n |
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| 4x | 0 | |||
| 2K7 |
| 7 |
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| VEE |
| 3 | 1 | ||
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| 8 | GND |
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| G4 |
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| HFGND |
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| 7023 |
| HFGND 1 | 0 |
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| BFS20 |
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| 5 |
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| 1 |
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| 2 |
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| 2 |
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| 4 |
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| 3 |
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| 2141 |
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| 12 |
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| 2n2 |
| 14 |
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| 3180 | 2K7 | 390p | 2146 |
| 15 |
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| 2149 | 1n5 |
| 11 |
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| HFGND | 680p |
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+5VHF |
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| +5VHF |
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3188 | 2K7 |
| HF |
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| 3189 |
| 390R |
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| 7009 |
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| 22n | 2160 | 47u | 2161 | 3193 |
| 180R |
| BFS20 |
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| HFGND | HFGND |
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| 1K |
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| 3196 |
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| HF |
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| BC858B |
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| 7007 |
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3203 | HFGND |
| 7010 |
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| 3205 |
| 10K | ||
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| HFGND |
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| 2K7 |
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| BC848B |
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| HFGND | ||
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| Figure | ||||||
10 |
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| S1 | 3 |
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9 |
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| S2 |
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6 |
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| 22n |
| 2137 | 22n |
| 2138 |
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HFGND |
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3 |
| HFGND HFGND |
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| 7000 |
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| HF |
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| SAA7324 |
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| HFIN | 2142 | F309 |
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| 1 HFREF |
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13 |
| F156 | 3178 | 22n | 2145 |
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| HFGND F310 | 47p |
| 2 | HFIN |
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| 1K | 2150 | 3181 |
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| 3 | ISLICE |
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| 47n | 22K | F159 |
| FRONT | |
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| HFGND |
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| 4 | VSSA1 | |
| 9 |
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| END |
F313 |
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| 5 | VDDA1 |
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HF
CL96532086_057.eps 080999
DC Settings
Set the power and reset connections as described above in "1.1.1. Supply Voltages". Check the following voltages :
Force
S1 and S2 “HIGH”
S1 and S2 “LOW”
S1 and S2 “HIGH”
S1 and S2 “LOW”
S1 and S2 “HIGH”
S1 and S2 “LOW”
Pin
Emitter
Collector
Collector
13
13
3
3
Location
7006
7010
7010
7025
7025
7025
7025
Measure
2.4± 10%
1.9± 10%
1.9± 10%
1.6± 10%
1.6± 10%
3.2± 10%
3.2± 10%
CL96532086_058.eps 080999
Figure
29
