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Regarding service information other than these sections, refer to the HR-S5900U service manual (No.82848).
Also, be sure to note important safety precautions provided in the service manual.

4. CHARTS AND DIAGRAMS (4-1 to 4-28)
4.1 BOARD INTERCONNECTIONS ..................................... 4-2
4.2 MAIN (VIDEO/AUDIO) SCHEMATIC DIAGRAM ............ 4-4
4.3 MAIN (S-SUB) SCHEMATIC DIAGRAM ......................... 4-6
4.4 MAIN (SYSCON) SCHEMATIC DIAGRAM ..................... 4-8
4.5 MAIN (SW.REG) SCHEMATIC DIAGRAM .................... 4-10
4.6 MAIN (TUNER/DEMOD) SCHEMATIC DIAGRAM ....... 4-12
4.7 MAIN (FRONT) AND ADV. JOG
SCHEMATIC DIAGRAMS .......................... 4-14
4.8 MAIN (TERMINAL) SCHEMATIC DIAGRAM ................ 4-16
4.9 MAIN (BS CONNECTION),
S JACK AND R.PAUSE SCHEMATIC DIAGRAMS ........... 4-18
4.10 2D DIGITAL SCHEMATIC DIAGRAM ........................... 4-20
4.11 DEMODULATOR SCHEMATIC DIAGRAM ....................... 4-22
4.12 MAIN AND R. PAUSE CIRCUIT BOARDS ........................ 4-24
4.13 2D DIGITAL AND
DEMODULATOR CIRCUIT BOARDS ...................... 4-27
4.14 REMOTE CONTROLLER SCHEMATIC DIAGRAM ..... 4-28
4.15 FDP GRID ASSIGNMENT AND
ANODE CONNECTION ............................... 4-28
5. PARTS LIST (5-1 to 5-12)
5.1 PACKING AND ACCESSORY ASSEMBLY  .......... 5-1
5.2 FINAL ASSEMBLY  ................................................ 5-2
5.3 MECHANISM ASSEMBLY  .................................... 5-4
5.4 ELECTRICAL PARTS LIST ............................................. 5-6
MAIN BOARD ASSEMBLY <03> .................................... 5-6
DEMOD BOARD ASSEMBLY<14> ................................... 5-12