Section 7 schematics and PCB X-ray views, redrawn
All 26 sheets of the QXHD’s Section 7. Pick a sheet to zoom in, or take the whole set as a ZIP of the full-size sheets.
Diagrams
Audio boards
7-04Schematic - Record Amplifier Ver. A
7-05PCB X-Ray - Record Amplifier Ver. A
7-06Schematic - Record Amplifier Ver. B
7-07PCB X-Ray - Record Amplifier Ver. B
7-08Schematic - Reproduce Amplifier
7-09PCB X-Ray - Reproduce Amplifier
7-10Schematic - Selective Reproduce Amplifier
7-11PCB X-Ray - Select Reproduce Amplifier
7-12PCB & Schematic - Test Oscillator
7-13Schematic - Bias Buffer Amplifier Ver. A
7-14PCB X-Ray - Bias Buffer Amplifier Ver. A
7-15PCB X-Ray - Bias Buffer Amplifier Ver. B
Oscillator and power
Transport
Capstan
7-22PCB & Schematic - Capstan Motor Power Supply
7-23Schematic - Capstan Motor - Transistorless Speed Select - AS BUILT
7-24PCB X-Ray - Capstan Motor - Transistorless Speed Select - AS BUILT
7-25Schematic - Capstan Motor - Transistor Speed Select - OEM
7-26Schematic - Capstan Motor - Transistorless Speed Select - OEM