Revision
This service manual is a revised version for the modified AV550, applicable to the latest products since production serial number "MZxxxxxx11xxxx". The mains outlet circuits have been modified from unswitched to switched. This manual details these changes and components updated to a new design for the AV550 model (since LOT number 11). All other information is available in the service manual for the model AV550 (Code number: 280J855010). Parts dispatch for after-sales service should prioritize this manual. It is essential to use this service manual in conjunction with the service manual of the model AV550 (Code number: 280J855010) and the user guide (D.F.U.).
Parts List
| POS. NO | VERS. COLOR | PART NO. (FOR PCS) | DESCRIPTION | PART NO. (MJI) |
|---|---|---|---|---|
| J802 | 4822 280 20517 | JACK 2P MAINS OUTLET | YJ04002040 | |
| L803 | 4822 280 20517 | RELAY VS24MB | LY10240190 | |
| L851 | 4822 157 70419 | LF-4D-102 | FN01020020 | |
| D817 | 4822 130 82421 | DIODE 1D3 1A 200V | HD20002710 | |
| D818 | 4822 130 82421 | DIODE 1D3 1A 200V | HD20002710 | |
| D819 | 4822 130 82421 | DIODE 1D3 1A 200V | HD20002710 | |
| Q813 | 4822 130 42949 | TRS. 2SA970 GR BL | HT109702A0 | |
| Q814 | 4822 130 42594 | DIG.TRS. DTC144ES UN4213 | BA20002000 | |
| C833 | 4822 122 31956 | CER. 0.001µF ±10% AC400V | DK16102840 | |
| R809 | SOLID RESISTOR 2.2M Ω 1/2W | RC10225820 | ||
| R814 | 4822 116 83864 | RESISTOR 10k Ω ±5% 1/6W | GD05103160 | |
| R815 | 4822 116 83864 | RESISTOR 10k Ω ±5% 1/6W | GD05103160 | |
| R816 | 4822 116 52297 | RESISTOR 68k Ω ±5% 1/6W | GD05683160 | |
| 001T | USER GUIDE (D.F.U.) | 280J851253 |
Schematic Diagram (Modified Part)
The schematic diagram illustrates a modified part of the circuit. It shows connections to a +B voltage of 20.6V (from D802) and the collector of Q804. The circuit includes a transistor Q813 (2SA970) and Q814 (DTC144ES), diodes D817, D818, and D819 (all 1D3), a capacitor C833 (0.001µF ±10% AC400V), and resistors R814 (10k Ω), R815 (10k Ω), R816 (68k Ω), and R809 (2.2M Ω 1/2W). It also features relays L803 (VS24MB) and L851 (LF-4D-102), and mains outlet jacks J802, J851, J803. The diagram indicates connections to other circuit points such as W001 and J831.
Marantz model AV550
Printed in Japan
First Issue: 1998.09
Document Code: 280J855020 AO
