Service Manual
HCD-GPX33 is the amplifier, USB, CD player,
Bluetooth, NFC and tuner section in MHC-GPX33.
HCD-GPX55 is the amplifier, USB, CD player, Bluetooth, NFC and tuner section in MHC-GPX55.
HCD-GPX77 is the amplifier, USB, CD player, Bluetooth, NFC and tuner section in MHC-GPX77.
HCD-GPX88 is the amplifier, USB, CD player, Bluetooth, NFC and tuner section in MHC-GPX88.