General Section ........................... 1-3…1-27 Video Recorder Overview ........................ 1-3 Test Equipment / Jigs .............................. 1-5 Specifications ........................................... 1-5 Tables of Norms an Channels ................. 1-5 Operating Hints ...................................... 1-14 Service Instructions ................................ 1-27 Adjustment Procedures ............... 2-3…2-4 Chassis Board .......................................... 2-3 VCR Option Code .................................... 2-4 Trouble Shooting Diagrams ....... 3-9…3-28 Layout of the PCBs and Circuit Diagrams .................. 4-1…4-36 Block Circuit Diagram .............................. 4-1 • Power Supply ........................................ 4-1 • Digital .................................................... 4-3 • Frontend / Stereo Decoder ................... 4-5 • Frontend / NICAM/Stereo Decoder ....... 4-6 • Video/Chroma/Standard Sound ............... 4-7 • Video/Chroma (PAL/SECAM B/G/L/L´) ... 4-10 • Audio ................................................... 4-13 Chassis Board ........................................ 4-15 • MAIN 1: Keyboard Control ................ 4-21 Drive Control ....................... 4-21 • MAIN 2: IN/OUT ................................ 4-23 FM Sound ........................... 4-23 • MAIN 3: Video/Chroma ..................... 4-25 Standard Sound .................. 4-25 • MAIN 3a: SECAM ............................... 4-31 • MAIN 4: Power Supply ...................... 4-27 • MAIN 5: Frontend.............................. 4-29 IF MULTI: SECAM Board..................... 4-32 IGR: Stereo Decoder ................... 4-35 NICAM/IGR:NICAM/Stereo Decoder ...... 4-36 Drive Mechanism ........................ 5-9…5-16 Test Equipment / Jigs .............................. 5-9 Overview of the Drive Mechanism ........... 5-9 Disassembly Instructions ....................... 5-10 Note on Assembling the Drive Mechanism ................................... 5-12 Adjustments ........................................... 5-12 Sequence of Mechanical Operations ..... 5-14 Mechanical Troubleshooting .................. 5-16 Exploded Views and Spare Parts Lists ......................... 6-1…6-16

Introduction This Supplement Service Manual describes the GV 920 HiFi and GV 950 HiFi/NIC video recorders in the GV 900…, GV 940… series. For detailed information please see the Video Recorder Overview. Additionally, spare parts lists for the video recorder version in Titan colour are included. Note: Basic instructions for servicing are given in the following Service Manuals: – Service Manual Safety, Part Number 72010 800 0000 – Service Manual, Part Number 72010 535 2000