Sony HVR-A1J Service Manual page 272

4-3. Tape Path Adjustment
3-1. Adjustment Preparation
1) Clean the tape running surface (tape guides, drum, capstan,
pinch roller) referring to section 2-2.
2) Connect the adjustment remote commander (Ref. No. J-1, J-2)
to the LANC terminal of the machine. Set the HOLD switch to
ON. (Set the slide switch to SERVICE)
3) Connect an oscilloscope to NN-001 board CN7005 via the
CPC-7 jig (J-6082-382-A).
Channel 1: NN-001 board, CN7005 Pin 9 (Note)
External trigger: NN-001 board, CN7005 Pin qa
Note: Connect a 75 Ω resistor between pins 9 of CN7005
and 8 (GND).
75 Ω resistor (Parts code: 1-247-804-11)
4) Play back the tracking standard (XH 2-1) (Ref. No. J-13).
5) Select page: 0, address: 10 and set data: 00.
6) Select page: 3, address: 26 and set data: 31, and press the PAUSE
(Write) button.
7) Select page: 3, address: 33 and set data: 08.
8) Confirm that the RF waveform on the scope is flat at both of
the entrance side and the exit side. (Refer to Fig. 6-2-7A.)
If the RF waveform is not flat either at the entrance side or the
exit side (refer to Fig. 6-2-7 B and C), perform the adjustment
of section "3-2. TG2/TG4 Guide Coarse Adjustment" and later.
9) Prepare an exclusive DVM-80 tape (commercial item).
(Remove the lid of the cassette.)
10) When the required conditions of step 8) are satisfied, perform
[Required Work upon Completion of Adjustment] as described
below upon completion of adjustment/check.
[Required Work upon Completion of Adjustment]
1) Connect the adjustment remote commander (Ref. No. J-1, J-2) to
the LANC terminal of the machine. Set the HOLD switch to ON.
(Set the slide switch to SERVICE)
2) Select page: 0, address: 10 and set data: 00.
3) Select page: 3, address: 26 and set data: 00, and press the PAUSE
(Write) button.
4) Select page: 3, address: 33 and set data: 00.
HVR-A1J/A1U/A1N/A1E/A1P/A1C
Assemble without this part.
Cassette lid
Torsion spring
Exclusive DVM-80 tape
(commercial item)
Envelope must be flat
CH1
CH2
(Trigger)
3.3 msec
Entrance side
T reel
Pinch roller
Capstan
TG6 guide TG5 guide
Tape must run while maintaining contact with the upper flange.
There must not exist a large tape curl.
There must not exist
a large tape curl.
Capstan
TG5 TG4
TG6
6-107
Fig. 6-2-6
Exit side
Normal
A
Entrance side is defective
B
Exit side is defective
C
Fig. 6-2-7
S reel
Drum
TG2 guide
TG3 guide
TG4 guide
There must not exist
a large tape curl.
FWD
Tape
TG3 TG2
Fig. 6-2-8
TG1
guide
TG1