Grundig GV 709 M User manual

Printed in Germany
Subject to alteration VK 21/1 0896 Service Manual Part No. 72010-527.55
VIDEO
SERVICE MANUAL
Service
Manual
Service
Manual
GV 709 M
GV 729 M
Part No.
72010-527.55
Safety
Part No.
72010-800.00
GV 709 M
GV 729 M
GV 709 M (758636-1000 / G.MF 6600)
GV 729 M (758637-1000 / G.MF 6700)
D
Btx *32700 #
NTSC
PAL /ME/SECAM Remote Control
Additionally required
Service Manuals for
the Complete Service:

1 - 2 GRUNDIG Service
General GV 709 M, GV 729 M
Specification
VHS-System
1/2” video cassette recorder
Tape speed.................................2.339cm/s (Standard play)
Head to tape speed.........................4.84m/s (Standard play)
TV standard (GV 709 M)
CCIR, B/G, DK - PAL
TV standard (GV 729 M)
CCIR, DK, I - PAL
Record and playback of tapes with norm
PAL
MESECAM / NTSC (3,58) via A/V socket
Sound
Input via cinch socket............-8dBs, 50kΩ(0dB = 0.775Vrms)
Output via cinch socket...........-6dBs, 1kΩ(0dB = 0.775Vrms)
Video
Signal / noise ratio.....................approx. 43dB (unweighted)
Video resolution..............................................approx. 3MHz
Input via cinch socket....................................0.5…2Vpp, 75Ω
Output via cinch socket..........................................1Vpp, 75Ω
Mains voltage..............................................110V~…240V~
Mains frequency...................................................50 / 60Hz
Power consumption........................................approx. 17W
Ambient temperature...................................+5°C … +40°C
Operating position...............................................horizontal
General
Test Equipment / Aids
Variable isolating transformer Colour generator
Dual channel oscilloscope AF Generator
Digital multimeter Stabilized power supply
Millivoltmeter Frequency counter
Please note the Grundig Catalog "Test and Measuring Equip-
ment" obtainable from:
Grundig electronics GmbH
Würzburger Str. 150
D-90766 Fürth/Bay.
Tel. [phone]
Telefax 0911/703-4479
Part no.
Presetting unit.................................................75981-311.26
Test cassette...................................................75981-311.27
Back tension cassette gauge..........................75981-311.33
A/C head positioning tool................................75981-311.34
Roller driver.....................................................75981-311.35
You can order this test equipment from the Service organi-
zation. We refer to you that this test equipment is already
obtainable on the market.
The regulations and safety instructions shall be valid as provided by the "Safety" Service
Manual, part number 72010-800.00, as well as the respective national deviations.
GB
Table of Contents
Page
General................................................1-1…1-10
Test Equipment / Aids......................................................1-2
Specification.....................................................................1-2
Disassembly.....................................................................1-3
Mechanism Adjustment.....................2-1…2-16
Electrical Adjustment..........................3-1…3-3
Layout of PCB
and Circuit Diagrams.........................4-1…4-36
Schematic Diagram Notes...............................................4-1
Circuit Board Notes..........................................................4-2
Board Interconnections....................................................4-3
SYSTEM CONTROL Block Diagram...............................4-5
Video Block Diagram.......................................................4-7
Video Schematic Diagram...............................................4-9
System Control Schematic Diagram..............................4-11
Switching Regulator Schematic Diagram.......................4-13
Tuner Schematic Diagram.............................................4-15
Servo Schematic Diagram.............................................4-17
Front Schematic Diagram..............................................4-19
On Screen Schematic Diagram.....................................4-21
Waveforms.....................................................................4-23
Main Circuit Board.........................................................4-25
FDP Grid Assignment and Anode Connection...............4-27
Remote Control Schematic Diagram.............................4-28
Exploded Views.....................................5-1…5-2
Technical Information...........................6-1…6-1
Spare Parts List.....................................7-1…7-1

GRUNDIG Service 1 - 3
GV 709 M, GV 729 M Disassembly

1 - 4 GRUNDIG Service
Disassembly GV 709 M, GV 729 M

GRUNDIG Service 1 - 5
GV 709 M, GV 729 M Disassembly

1 - 6 GRUNDIG Service
Disassembly GV 709 M, GV 729 M

GRUNDIG Service 1 - 7
GV 709 M, GV 729 M Disassembly

1 - 8 GRUNDIG Service
Disassembly GV 709 M, GV 729 M

GRUNDIG Service 1 - 9
GV 709 M, GV 729 M Disassembly

2 - 1 GRUNDIG Service
Mechanism Adjustment GV 709 M, GV 729 M

GRUNDIG Service 2 - 2
GV 709 M, GV 729 M Mechanism Adjustment
Presetting unit Alignment tape Torque gauge Grease
75981-311.26 75981-311.27 75981-311.32 75988-034.74
Back tension cassette gauge A/C head positioning tool Roller driver
75981-311.33 75981-311.34 75981-311.35
2.1.4 Test equipment

2 - 3 GRUNDIG Service
Mechanism Adjustment GV 709 M, GV 729 M
Category Part No.
Oil 75981-311.30
Grease 75988-034.74

GRUNDIG Service 2 - 4
GV 709 M, GV 729 M Mechanism Adjustment

2 - 5 GRUNDIG Service
Mechanism Adjustment GV 709 M, GV 729 M

GRUNDIG Service 2 - 6
GV 709 M, GV 729 M Mechanism Adjustment

2 - 7 GRUNDIG Service
Mechanism Adjustment GV 709 M, GV 729 M

GRUNDIG Service 2 - 8
GV 709 M, GV 729 M Mechanism Adjustment

2 - 9 GRUNDIG Service
Mechanism Adjustment GV 709 M, GV 729 M

GRUNDIG Service 2 - 10
GV 709 M, GV 729 M Mechanism Adjustment

2 - 11 GRUNDIG Service
Mechanism Adjustment GV 709 M, GV 729 M