For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700 (MECHANISM ASSEMBLY).
Regarding service information other than these sections, refer to the service manual No. YD008 (HR-XVC27US).
Also, be sure to note important safety precautions provided in the service manual.
• Signal generator: stairstep, color (colour) bar [PAL]
• Recording tape
• Digit-key remote controller(provided)
4.1.3 Required adjustment tools
--- : Not used
z
: Used
Mechanism
compatibility
adjustment
Roller driver
z---
Jig RCU ---z
Back tension cassette gaugez---
Alignment tape (MHP, MHPE)z---
Alignment tape (MHP-L,MHPE-L) zz
Roller driver
PTU94002
Alignment tape
(SP, stairstep, PAL)
MHPE
Alignment tape
(SP, stairstep, NTSC)
MHP
Jig RCU
PTU94023B
Alignment tape
(LP, stairstep, PAL)
MHPE-L
Alignment tape
(EP, stairstep, NTSC)
MHP-L
Back tension cassette gauge
Electrical
adjustment
PUJ48076-2
DVD test disc
VT-501
CD-DA test disc
CTS-1000
4.1.4 Color (colour) bar signal,Color (colour) bar pattern
Color(colour) bar signal [NTSC]
White(100%)
White(75%)
100 IRE
1V
40 IRE
Horizontal sync
Colour bar signal [PAL]
White(75%)
0.7 V
1V
0.3 V
Horizontal sync
Yellow
Cyan
Green
QI
White(100%)
Yellow
Cyan
Green
VU
Magenta
Red
Magenta
Red
V(R-Y)
U(B-Y)
Blue
Blue
Burst
Color(colour) bar pattern [NTSC]
(75%)
Burst
40 IRE
0.3 V
White
Yellow
White
QIBlack
100%
Colour bar pattern [PAL]
(75%)
Cyan
White
Yellow
UBlack
V
Cyan
White
100%
Green
Green
4.1.5 Switch settings
When adjusting this unit, set the VCR mode and switches as described below.
• When using the Jig RCU, it is required to set the VCR to the
Jig RCU mode (the mode in which codes from the Jig RCU can
be received). (See "section 2 SPECIFIC SERVICE INSTRUCTIONS".)
Jig RCU
[Data transmitting method]
Depress the " "( 3 ) button
after the data code is set.
CUSTOM CODE
43: A CODE
DATA CODE
INITIAL MODE
Fig.4-1a Jig RCU [PTU94023B]
• Set the switches as shown below unless otherwise specified
on the relevant adjustment chart. The switches that are not listed below can be set as desired.
If the VCR is not equipped with the functions detailed below,
setup is not required.
• Although compatibility adjustment is very important, it
is not necessary to perform this as part of the normal
servicing work. It will be required when you have replaced the A/C head, drum assembly or any part of the
tape transport system.
• To prevent damaging the alignment tape in the compat-
ibility adjustment, prepare a cassette tape (for self-recording/playback), perform a test on it by transporting it
and making sure that the tape is not bent by the tape
transport mechanisms such as in the guide rollers.(See
Fig.4-2b.)
4.2.1 Tension pole position
Note:
• This adjustment must be performed every time the ten-
sion band is replaced.
Signal(A) • Back tension cassette gauge [PUJ48076-2]
Mode(B1)
Adjustment part (F) • Adjust pin [Mechansim assembly]
Specified value (G)
•PB
(B2)
• Eject end
• 25 - 51 gf·cm (2.45 - 5 x 10
-3
Nm)
(1) Play back the back tension cassette gauge (A).
(2) Check that the indicated value on the left side gauge is
within the specified value (G).
(3) If the indicated value is not within the specified value (G),
perform the adjustment in a following procedure.(See
Fig.4-2a.)
a) Remove the top frame, cassette holder and side
frames (L/R) all together. (Refer to the SERVICE
MANUAL No.86700 [MECHANISM ASSEMBLY].)
b) Rotate the loading motor gear to move the control
plate so that the triangular stamping to the left of the
"P"stamping is aligned with the stamping (a) on the
main deck. This positioning is mode (B1).
c) Adjust by turning the adjustment pin so that the tip of
the tension arm is aligned with the stamping (b) on
the main deck.
d) Rotate the reel disk (S) by about one turn clockwise
and make sure that the round hole of the adjustment
pin is located in the "OK" range. If it is outside this
range, restart the adjustment from the beginning.
After completion of the adjustment, rotate the loading gear
motor to return it to the mode (B2) position.
ADJUST PIN
NG
Fig.4-2a
4.2.2 FM waveform linearity
Signal(A1)
Mode(B) • PB
Equipment(C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D. FF)
Adjustment part (F) • Guide roller [Mechanism assembly]
Specified value (G) • Flat V. PB FM waveform
Adjustment tool (H) • Roller driver [PTU94002]
• Alignment tape(EP, stairstep, PAL) [MHP-L]
(UJ, UM Model)
(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe
the V.PB FM waveform at the measuring point (D).
(3) Set the VCR to the manual tracking mode.
(4) Make sure that there is no significant level drop of the V.PB
FM waveform caused by the tracking operation, with its
generally parallel and linear variation ensured. Perform the
following adjustments when required. (See Fig. 4-2c.)
(5) Reduce the V.PB FM waveform by the tracking operation.
If a drop in level is found on the left side, turn the guide roll-
er of the pole base assembly (supply side) with the roller
driver to make the V.PB FM waveform linear.
If a drop in level is on the right side, likewise turn the guide
roller of the pole base assembly (take-up side) with the
roller driver to make it linear. (See Fig. 4-2c.)
(6) Make sure that the V.PB FM waveform varies in parallel
and linearly with the tracking operation again. When re-
quired, perform fine-adjustment of the guide roller of the
pole base assembly (supply or take-up side).
(7) Unload the cassette tape once, play back the alignment
tape (A1) again and confirm the V.PB FM waveform.
(8) After adjustment, confirm that the tape wrinkling does not
occur at the roller upper or lower limits. (See Fig. 4-2b.)
[Perform adjustment step (9) only for the models equipped
with SP mode and EP (or LP) mode.]
[Perform adjustment step (9) only for the models
equipped with SP mode and EP (or LP) mode.]
(9) Repeat steps (1) to (8) by using the alignment tape (A2).
(No.YD023)1-5
Improper
(a)
GUIDE ROLLER
(b)
GUIDE POLE
Proper
Fig.4-2b
Proper waveform variation
Improper waveform variation
A
C
UpDown
B
D
Roller driver
Guide roller
(supply side)
Fig.4-2c
4.2.3 Height and tilt of the A/C head
Note:
• Set a temporary level of the height of the A/C head in ad-
vance to make the adjustment easier after the A/C head
has been replaced. (Refer to the SERVICE MANUAL
No.86700 [MECHANISM ASSEMBLY].)
Mode(B) • PB
Equipment(C) • Oscilloscope
Measuring point (D1)
External trigger (E) • TP111 (D. FF)
Adjustment part (F) • A/C head [Mechanism assembly]
Specified value (G) • Maximum waveform
(UA Model)
(A) • Alignment tape(SP, stairstep, PAL) [MHP]
(UJ, UM Model)
• TP106 (PB. FM)
(D2)
• TP4001 (CTL. P)
(1) Play back the alignment tape (A).
(2) Apply the external trigger signal to D.FF (E), to observe the
AUDIO OUT waveform and Control pulse waveform at the
measuring points (D1) and (D2) in the ALT mode.
(3) Set the VCR to the manual tracking mode.
(4) Adjust the AUDIO OUT waveform and Control pulse wave-
form by turning the screws (1), (2) and (3) little by little until
both waveforms reach maximum. The screw (1)
and (3) are for adjustment of tilt and the screw (2) for azimuth.
Head base
(2)
A/C head
(3)
(1)
AUDIO OUT
CTL. P
Fig.4-2d
4.2.4 A/C head phase (X-value)
Signal(A1)
Mode(B) • PB
Equipment(C) • Oscilloscope
Measuring point (D) • TP106 (PB. FM)
External trigger (E) • TP111 (D. FF)
Adjustment part (F) • A/C head base [Mechanism assembly]
Specified value (G) • Flat V. PB FM waveform
Adjustment tool (H) • Roller driver [PTU94002]
• Alignment tape(EP, stairstep, PAL) [MHP-L]
(UJ, UM Model)
(1) Play back the alignment tape (A1).
(2) Apply the external trigger signal to D.FF (E), to observe the
V.PB FM waveform at the measuring point (D).
(3) Set the VCR to the manual tracking mode.
(4) Loosen the screws (4) and (5), then set the Roller driver to
the innermost projected part of the A/C head. (See Fig. 4-
2e.)
(5) Rotate the roller driver so that the A/C head comes closest
to the capstan. From there, move the A/C head back grad-
ually toward the drum until the point where the FM wave-
form is maximized for the second time, and then
tighten the screws (4) and (5) temporarily.
(6) Play an alignment tape (A2) and set to the manual-tracking
mode.
(7) Fine-adjust A/C head base position to maximize the FM
waveform, and then tighten the screws (4) and (5) firmly.
(8) Play alignment tapes (A1) and (A2) and confirm that the FM
waveforms are maximized when the tracking is at the cen-
ter position.
To the drum
Toward the capstan
Toward the drum
A/C head
Screw (5)
Roller driver
Screw (4)
Head base
To the capstan
Fig.4-2e
1-6 (No.YD023)
Alignment tape
[SP, stairstep]
played with the
SP head
Alignment tape
[EP(LP), stairstep]
played with the
EP(LP) head
Trigger point
Switching point
V.sync
Waveform output
X-value adjustment point
Drum sideControl head positionCapstan side
Maximum
Fig.4-2f
4.3 Electrical adjustment [VHS SECTION]
Note:
The following adjustment procedures are not only necessary after replacement of consumable mechanical parts
or board assemblies, but are also provided as references
to be referred to when servicing the electrical circuitry.
In case of trouble with the electrical circuitry, always begin a service by identifying the defective points by using
the measuring instruments as described in the following
electrical adjustment procedures. After this, proceed to
the repair, replacement and/or adjustment. If the required
measuring instruments are not available in the field, do
not change the adjustment parts (variable resistor, etc.)
carelessly.
4.3.1 Servo circuit
4.3.1.1Switching point
Signal(A1)
Mode(B) • PB
Equipment(C) • Oscilloscope
Measuring point (D) • VIDEO OUT terminal (75 ohm terminated)
(1) Play back the signal (A1) of the alignment tape (A2).
(2) Apply the external trigger signal to D.FF (E) to observe
the VIDEO OUT waveform and V.PB FM waveform at
the measuring points (D1) and (D2).
(3) Set the VCR to the manual tracking mode.
(4) Adjust tracking so that the V.PB FM waveform becomes
maximum.
(5) Set the VCR to the Auto adjust mode by transmitting the
code (F) from the Jig RCU. When the VCR enters the
stop mode, the adjustment is completed.
(6) If the VCR enters the eject mode, repeat steps (1) to (5)
again.
(7) Play back the alignment tape (A2) again, confirm that the
switching point is the specified value (G).
<UA Model>
(1) Play back the signal (A1) of the alignment tape (A3).
(2) Perform the above steps (2) to (6).
V. rate
Fig.4-3a Switching point
4.3.1.2Slow tracking preset
Signal(A1)
Mode (Notes)
Measuring point (D) • TV-Monitor
Adjustment part (F) • Jig RCU: Code “43-71”or “43-72”
Specified value (G) • Minimum noise
Adjustment tool (H) • Jig RCU [PTU94023B]
• Ext. input
• Color (colour) bar signal [NTSC]
(A2)
• Color (colour) bar signal [PAL-N]
(A3)
(UA Model)
(B1) • SP/EP
(B2) UA Model
• SP/LP
(1) Record the signal (A2) in the mode (B1), and play back the
recorded signal.
(2) Set the VCR to the manual tracking mode.
(3) Set the VCR to the FWD slow (+1/6x) mode.
(4) Transmit the code (F) from the Jig RCU to adjust so that the
noise bar becomes the specified value (G) on the TV mon-
itor in the slow mode.
(5) Set the VCR to the Stop mode.
(6) Confirm that the noise bar is (G) on the TV monitor in the
slow mode.
<UA Model>
(1) Record the signal (A3) in the mode (B2), and play back
the recorded signal.
(2) Repeat steps (2) to (6) .
Note:
• For FWD slow (+1/6x) playback, transmit the code "43-08"
from the Jig RCU to enter the slow playback mode, and
transmit the code “43-D0” for REV slow (+1/6x) mode.
4.3.2 Syscon circuit [UA, UM MODELS]
Notes:
• When perform this adjustment, remove the Mechanism
assembly.
4.3.2.1Timer clock
Signal(A1) • No signal
Mode(B)• EE
Equipment(C)• Frequency counter
Measuring point (D1)
Adjustment part (F)• C3025 (TIMER CLOCK)
Specified value (G)• 1024.008 ± 0.001 Hz
• IC3001 pin 44
(D2)
• IC3001 pin 103
(D3)
• C3054 + and -
(976.5549 ± 0.0010 usec)
(1) Connect the frequency counter to the measuring point (D1).
(2) Connect the short wire between the short point (D2) and
Vcc (5V).
(3) Short the leads of capacitor (D3) once in order to reset
the microprocessor of the Syscon.
(4) Disconnect the short wire between the short point (D2)
and Vcc then connect it again.
(5) Adjust the Adjustment part (F) so that the output frequency
becomes the specified value (G).
(No.YD023)1-7
SECTION 5
TROUBLESHOOTING
Please refer to "HR-XVC27US No.YD008" about this section.
1-8 (No.YD023)
(No.YD023)1-9
Victor Company of Japan, Limited
AV & MULTIMEDIA COMPANY DIGITAL VIDEO STORAGE CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan
(No.YD023)
Printed in Japan
WPC
SCHEMATIC DIAGRAMS
DVD PLAYER & VIDEO CASSETTE RECORDER
HR-XVC27UA,HR-XVC27UM,
HR-XVC29UJ
CD-ROM No.SML200409
(UM, UJ model)
(UA model)
HR-XVC27UA, HR-XVC27UM, HR-XVC29UJ [D3PV0]
For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700 (MECHANISM ASSEMBLY).
Regarding service information other than these sections, refer to the service manual No. YD008 (HR-XVC27US).
Also, be sure to note important safety precautions provided in the service manual.