Drive Mechanism; Test Equipment / Jigs - Grundig TVR 3735 FR/TOP Servicehandbuch

Drive Mechanism

Drive Mechanism
The drive mechanism is fitted with 3 motors providing:
– precision drive of the headwheel
– direct drive of the capstan
– drive of the cassette compartment and of the tape threading/
unthreading mechanism.
Its special features are:
– quick start
– short winding/rewinding time
The specified position numbers (Pos. ...) are also used in the exploded
views.

1. Test Equipment / Jigs

Variable isolating transformer
Dual-channel oscilloscope with 10:1 test probes
Please note the Grundig catalogue "Test and Measuring Equipment"
obtainable from:
Grundig AG, Geschäftsbereich Instruments
Test- und Meßsysteme
Würzburger Str. 150, D-90766 Fürth
Tel.: 0911 / 703-4118, Fax: 0911 / 703-4130
eMail: instruments@grundig.com
Internet: http://www.grundig-instruments.de
Nylon gloves ..................................................... commonly available
Slide gauge ........................................................ commonly available
Screwdriver (slotted) ................. commonly available
Hexagon box wrench 5.5mm .... commonly available
Tentelometer
Tentelometer ............................. commonly available
Test cassette ................................. 75988 061 7000
2. Overview of the Drive Mechanism
Top side of the mechanism (cassette compartment removed)
A0100 Mechanism chassis
A0200 Complete brake actuating
slide
A0300 Loading slide
A0400 Threading roller unit, left
A0500 Threading roller unit, right
A0600 Threading arm, left
A0700 Threading arm, right
A0800 Threading rack gear
A1000 Capstan shaft/capstan motor
A1300 Audio/sync head (A/C)
A1500 Lever
A1600 Camwheel
A1700 Pinch roller assembly
A1900 Loading motor assembly
5 - 6
A2100 Idler wheel
A2300 Reel, left
A2350 Reel, right
A2500 Back tension arm
A2700 Reel brake, left
A2800 Reel brake, right
A2900 Reel main brake
A3100 Full-track erase head
A3300 Pulley/gear
A3500 Drive belt
A3600 Record lock
A3700 Earth spring
AD001 Tape drum assembly
B0050 Headwheel motor
Top side of the mechanism (cassette compartment removed)
Bottom side of the mechanism
A3100 A0400 A3700 AD001 A0500
A0100
A1000
A2350
A2300
A2500 A2700 A3600 A2900 A2100
Fig. 1
A0300 A0100 A1000 A0800 A0500
A3500
Fig. 2
TVR 3735..., TVR 3740..., TVR 5540...
A1300 A1700 A1600 A1900
A2900 A2800 A1500 A0300
A0700 B0050 A0600 A0400
A3300 A0200 A3600
GRUNDIG Service