Panasonic NV-HV61GN, Service Manual

Page: 130 / 159

25
5. MECHANICAL ADJUSTMENT
PROCEDURE
5-1. P2 AND P3 POST ADJUSTMENT
(PREADJUSTMENT)
Equipment required:
Post Adjustment Screwdriver (VFK0329)
(1) Remove the Top Plate.
(2) Turn the Loading Motor unit until the unloading
completes.
(3) Rotate the P2 and P3 Posts clockwise to the
end.(Fig.M1)
(4) Rotate the P2 and P3 Posts twice
counterclockwise.(Fig.M1)
Fig.M1
(5) Playback the cassette tape and make sure that the edges
of the tape are not curing at the bottom or top ends of the
P2, P3 and P4 Posts as shown in Fig.M2.
Fig.M2
6) If the curing appears, readjust the P2 and P3
Posts.
5-2. TAPE INTERCHANGEABILITY
ADJUSTMENT
Carry out the following procedures for Tape Interchangeability
Adjustment to do it correctly and smoothly.
(1) P2 AND P3 POST ADJUSTMENT
(2) ADJUSTMENT OF P4 POST
(3) HEIGHT ADJUSTMENT OF A/C HEAD
(4) FINE-ADJUSTMENT OF A/C HEAD
(5) ADJUSTMENT OF X-VALUE
(PREADJUSTMENT)
(6) FINE-ADJUSTMENT OF X-VALUE
If the Tape Interchangeability Adjustment is not perfect,
repeat the above procedures from (1) to (6).
CAUTIONS:
Turn the Auto-Tracking to off, and set the tracking
control to center fixing position.
To make an Adjustment Mode for Tape Interchangeability,
press the FF, REW and EJECT buttons simultaneously 3
times to set the Service Mode 2. Then the Auto Tracking
becomes off.
* In case of the VCR mounts JOG SHUTTLE, turn the shuttle
ring to FF and then press EJECT button.
NOTE:
Cleaning the Tape Transport path before adjusting of the
Tape Interchangeability. The detail portion is shown below.
Cleaning portions:
P0 Post, Tension Posts, FE Head, P2 Post, Supply Inclined
Post, Cylinder Unit, Take-up Inclined Post, P3 Post, A/C
Head, P4 Post, Pinch Roller, Capstan Shaft and P5 Post.
Note:
FE Head, Cylinder Unit, A/C Head and Capstan Shaft are
more important parts and pay attention to clean them.
5-2-(1). P2 AND P3 POST ADJUSTMENT
Equipment required:
Alignment Tape (PAL/SECAM: VFJ8125H3F)
(NTSC: VFM8080HQFP)
Post Adjustment Screwdriver (VFK0329)
(1) Connect the oscilloscope to the output of the Head Amp
as shown in Fig.M3.
NOTE:
To get a stable waveform of the Head Amp output
(observation point TW3001 and TW2001 located on Main
C.B.A.) on the oscilloscope, use the head switching pulse as
a triggering signal as shown in Fig.M3.