Smettere di rottami elettronici - ripararlo da solo

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 video recorders in the
GV 900…, GV 940… series, see front page. For detailed information
please see the Video Recorder Overview.
Additionally, spare parts lists for the differnt colour versions of GV9400…
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
– Supplement 1, Part Number 72010 535 2100