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| A85, P85, P85/3 Service Guide | ||||
Build History |
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ECO | Date | Description of Change | ||||||
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00_1089 |
| 02/10/00 |
| A85 – Fascia position changed to prevent display buttons sticking | ||||
00_1129 |
| 01/11/00 |
| A85, P85, P85/3 – Improved stability under heavy clipping of amplifier R345, | ||||
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| R346, R445, R446 changed from 100R to 0R link | ||||
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| C307, C308, C407, C408 changed from 47P to 100P capacitors | ||||
00_1138 |
| 27/11/00 |
| A85, P85, P85/3 – C303, C304, C403 changed from 10uF to 100uf capacitors – | ||||
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| this prevents protection circuit from operating when driving a 4 ohm load at | ||||
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| low frequency | ||||
01_1030 |
| 23/02/01 |
| A85, P85, P85/3 – RV300, RV400 changed to 220R presets to make it easier to | ||||
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| adjust the bias settings | ||||
01_1068 |
| 11/04/01 |
| A85, P85, P85/3 – New output device clamp fitted to heatsink | ||||
01_1101 |
| 04/06/01 |
| A85, P85, P85/3 – Sensitivity of DC offset detection circuit reduced – Power | ||||
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| amp cct R308, R408 changed to 22K - R314, R414 changed to 10K | ||||
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| PSU surface mount fuse F202 up rated from 500mA to 750mA | ||||
01_1142 |
| 22/08/01 |
| A85 – Preamp board upgraded from L866 to L937 | ||||
01_1178 |
| 12/10/01 |
| A85, P85, P85/3 – Speaker terminals changed from Camcon to 4mm binding | ||||
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01_E014 | 28/11/01 |
| A85 – Preamp board fuses F300, F301 up rated to 2A surface mount | |||||
02_E033 | 31/01/02 |
| A85 – Extra pad F038 fitted under TX to stop TX coming loose in transit | |||||
02_E035 | 04/02/02 |
| A85, P85, P85/3 – Main 20mm fuse rating changed to 4AT | |||||
Software History |
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ECO |
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Number |
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01_1072 |
| 18/04/01 |
| 1.1 |
| Remote standby action changed from turning unit completely off | ||
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| to putting unit into standby | ||
01_1095 |
| 21/05/01 |
| 1.2 |
| Delay added to start H8 start up routine (volume control chip) | ||
01_1167 |
| 12/09/01 |
| 1.3 |
| Volume chip read/write protocol changed | ||
01_1179 |
| 26/10/01 |
| 2.0 |
| Added the processor mode option | ||
01_E011 |
| 23/11/01 |
| 2.1 |
| Corrected the welcome message saving fault. This fault was | ||
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| introduced with version 2.0 software | ||
02_E048 |
| 15/02/02 |
| 2.2 |
| Corrected the processor loop volume jump when v/c adjusted | ||
Current Fuse Ratings (20/02/02) | ||||||||
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Fuse Position |
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| Fuse Rating |
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Main Supply fuses - A85, P85, P85/3 |
| 2 x 4AT 20mm (Arcam part number C12406) |
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PSU fuse F202 - A85, P85, P85/3 |
| 750mA surface mount (Arcam part number C3751) |
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Preamp fuses F300, F301 – A85 |
| 2A surface mount (Arcam part number C3202) |
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Quiescent Current Setting |
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Left channel |
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| Measure points indicated on PCB - |
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| Adjust RV300 for 8.5mV cold or 12 mV when warm |
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Right channel |
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| Measure points indicated on PCB - |
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| Adjust RV400 for 8.5mV cold or 12 mV when warm |
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Page 8
Image 8
