Sanyo VHR-274G User manual

SERVICE MANUAL
Video Cassette Recorder
FILENO.
VHR-274G ~~etmwmy,
VHR=274EX
(GeneralEurope)
VHR-430
(NewZealand)
CONTENTS
SELF-DIAGNOSIS DISPLAY ............................2
I. DISASSEMBLY .....................................3
2. ELECTRICAL ADJUSTMENT .........................6
3. TEST POINT FOR TAPE PATH ADJUSTMENT ......... 13
4. PARTS LIST
ACCESSORIES ...................................14
PACKING MATERIALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
CABINET &CHASSIS PARTS .......................14
MECHANISM PARTS .............................. 15
ELECTRICAL PARTS .............................. 18
CIRCUIT DIAGRAMS (Refer to the separate volume)
ml PAL
Please see other materials with Reference
No. given in table below.
Materials Model No. Reference No.
‘echa”
Manual tiHV%anisrn ‘s531346
~‘RODucT‘AFETY‘OT’cE
The components designated by asymbol (~)in this schematic diagram designates components whose vslue are of special significance
to product safety. Should any component designated by asymbol need to be replaced, use only the part designated in the Parts List.
Do not deviate from the resistance, wattage and voltage ratings shown.
NOTE: 1. Patisorder must contain model number, patinumber and description.
2. Substitute parts may be supplied as the service parts. :#:3@~
3. N.S. P.: Not available as service parts.
TK21G,EX,NZ 143 14S 1S,16,39 REFERENCE No. SM531367

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W(N)VH33WeSd

M1-14801xN)1/3
1. DISASSEMBLY
-1-1.REMOVALOFCABINET,MECHANISMUNITANDMAIN BOARD
REMOVING THE CABINET PARTS (Fig. 1.1.1) REMOVING THE CP-I PWB ASSEMBLY (Fig. 1.1.3)
1. Remove the cabinet and bottom cover by removing the
four screws (A) and five screws (B). After removing the cabinet parts and mechanism unit:
2. Remove the front panel by removing the locks of the 1. Pull out the TM-1 PWB assembly while pressing and
clamps (C) using ascrewdriver, etc. and slightly rotating spreading outthefourclamps (H) as shown by the arrows.
the bottom part in the direction of the arrow. 2. Remove the two red screws (J). Next, remove the CP-I
Note: Electrical adjustments for the this model can be per- PWB assembly by lifting it straight up while pressing and
formed with only the cabinet removed. spreading out the two clamps (K) as ahown by the
arrows,
REMOVING THE MECHANISM MAIN UNIT (Fig. 1.1.2)
After removing the cabinet parts:
1. Remove the two screws (D), and then remove the bracket.
2. Remove the 22-wire flat cable from the MC-2 PWB, the 11-
wire flat cable from the VP-1 PWB assembly and the 6-pin
connector from the CP-I PWB assembly respectively.
3. Remove the mechanism main unit by removing the two
screws (E) and two screws (F). “
Remove, as well, the two screws (G) at the cassette tray
side while pressing the tray lock lever as shown in the
enlarged view and pushing the cassette tray to the posi-
tion where the two screw (G) appear.
M-TK4/E-l
Front Panel
Fig.1.1.1
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M1-14S18(N)3/’3
TEMPORARILY SElllNG UP AND CONNECTING MAIN PWB ASSEMBLY
The following is an example of how to place and connect the main PWB not requiring ajig, when repairing the
CP-1 PWB assembly (Fig. 1.1.4)
1. Place the mechanism-main unit at the fixed position on 3. Place the CP-I PWB assembly above the mechanism
the chassis. main unit along the cassette holder. Insert the tip (L) of
2. Connect the 29-wire flat cable to the MC-2 PWB ,and the the terminal board into the opening (M) at the side of the
8-wire flat cable to the VP-1 PWB assembly, Connect the chassis, as shown in the enlarge view.
TM-1 PWB assembly to operate VCR by using the remote
control.
“L
8-wire Flat Cable
VP-1 PWB Assembly=
6
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chassis-KiiEiE
i
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M-TK2LE-4
cP-
Tip (L)
Mechanism Main Unit’
I
‘~/Q&’J\~\Mc2pwB ..s.t?W?..,Wr
ACE Head 6-pinConnector
Opening(M)
Fig. 1.1.4
1-2.MAINCIRCUITBOARD
L-TEl/G
Shield Case
(Power supply Part)
●TM-8 PWB
(For VHR -274G)
Y
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●TM-7 or TM-8 %$%Y\ rMC-2 PWB
(On the Mechanism Unit)
Tuner/lF/RF conv. Unit
TM-1 PWB --CP-I PWB Fig. 1.2.1
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Z/l (N)81LW1-lS

SI-14801(N) 2/2
P1B08800C-S1
1— Shield case
,,,,”rrent1// \
TP181
TP183 SW-P +~~~,8~
TP182 ENV -
REC-YIC
IVP-1 PVVB Assembly Fig. 2.1.2
Note:
.Self-recording means ‘Record any broadcasting or video
signal and play back the just-recorded portion”.
2-1-3. SWITCHING POSITION ADJ.
Measuring Point Measuring Equipment ADJ. Condition
TPIOI Oscilloscope PIAY mode
(VIDEO OUT) Alignment tape
TP183 (SW-P) (VHJ-0009 or
VHJ-0023)
ADJ. Location ADJ. Value
VR351 (SW-P) 6.5 H10.5 H
1. Set the tracking control position to the center by pressing
CHANNEL buttons (+) and (-) simultaneously.
(Tracking center position display in the indicator
panel “T -:- “)
2. Adjust VR351 (SW-P) so that the width ‘T” becomes 6.5 H
A().5 Has shown in Fig. 2.1.3.
WS-SWP
T= 6.5 H*0.5 H
IFront edge of ~
Ivertical sync signal
tt
Rise RF. SW. PULSE
Fig. 2.1.3
2-1-4. STILL V-LOCK ADJ.
Measuring Point Measuring Equipment
Picture of Color bar generator
monitor TV or
Broadcasting
Monitor
/7
ADJ. Condition
Self-recording
(SP mode)
STILL mode
Blank tape
ADJ. Location ADJ. Value
CHANNEL (+) button The minimum vertical shake
CHANNEL (-) button
1. Play back the just-recorded portion and then set the VCR
in the STILL mode.
2. Press the CHANNEL (+) button or the CHANNEL (-) button
so that any vertical shake of the picture is brought to its
minimum.
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W(N)lOEV1-L

VI-14818(N)2/4
2-2-3. LOCATION OF ADJUSTMENT POINTS
P1BOB800C.V1
Shield Case
o
‘Yi’ “
@
-- 0
..—
TP181
REC current
TP183 SW-P
.- VR 182 REC-Y/C
,.>; TP182 ENV
VP-1 PVVEIAssembly Fig. 2.2.4
PlB243@3B-Vl/2
+
T
uo0●
,.. T,....,
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...,,
..,.
0
VR351
IC602 SW-P
...............
...............
TM-8 PWB IC351
IC301
o... ..............
a;
!... VR201
IC201c1
BIAS f------j
,....
:e:; ~
,....,;
,0
POWER ;
~SUPPLY ~...
:,
;PART ;!:
VR104
1C162 VR102 ‘Ev
CT120 O’p /0
Vco [j-: IC161
............, Q
.... ..,t-.-::r..:r...:Tpl 03 .............
TP1 02°[9.::.9,:*..?c:’.:.: O
v<
Unit
ft .........
;TP101 TP120 V~~~3 VR101
:.......................! V.OUT PB-Y
CP-I PWB (FOIL SIDE) Fig.2.2.5
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0
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V1-14818(N)U4
2-2-8. Y/C REC CURRENT ADJ.
-Measuring Point Measuring Equipment ADJ, Condition
TP181 Color bar generator REC(SP)mode
(on VP-1 PWB) Oscilloscope Blank tape
(1:1 probe)
ADJ. Location ADJ. Value
VR 182 (REC-Y/C) ForVHR-274G/EX:
650 mVp-p *20 mVp-p
For VHR-430:
550 mVp-p f20 mVp-p
1. Connect the ground of the oscilloscope to the shield
case of the VP-1 PWB assembly.
2. Adjust VR182 (REC-Y/C) so that the video luminance
signal level at the sync tip is Model VHR-274G/EX:
650 mVp-p *20 mVp-p, Model VHR-430 550 mVp-p i
20 mVp-p. (Refer to Fig. 2.2.9)
WV-YREC
t
VHR-274G/EX:
650 f 20 mVp-p
VHR-430:
550 *20 mVp-p
J
SY;C Tip
Fig. 2.2.9
i
2-2-9. VCO (on screen aaaist) ADA
I 1 1 I
Measuring Point Measuring Equipment ADJ, Condition
TP120 Color bar generator E-E mode
Digital voltmeter
ADJ. Location ADJ. Value
CT120 (VCO) 2.5 Vk 0.3 V
1. Connect the digital voltmeter (DC range) to TP120 and
GND.
2. Adjust CT120 (VCO) so that the voltage is 2.5 V*0.3 V. 3
–11–

–zl–
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uwmsnrav mom oianv ‘t-z
w(N)LOLWL-LV

T.TK2UE(N) 1/1
2-4.TUNERANDIFCIRCUITSADJUSTMENT
-* When any malfunction occurs in the TUNER circuit the Note:
whole unit must be replaced.
●An adjustment of the IF circuit is shown as follows.
2-4-1. TEST EQUIPMENT AND STANDARD REQUIRED
The TUNER unit does not need any adjustments,
because precise adjustments have been performed
before shipment.
L
Monitor TV 1
2-4-2. LOCATION OF ADJUSTMENT POINT
PPFUSO030-R1
\
VR (RFAGC) —
Tuner/lF/RF~
Conv. Unit
~Rear Panel
~CP-1 PWB
IF UNIT(PARTS SIDE) Fig. 2.4.1
2-4-3. RF AGC ADJ.
Measuring Point Measuring Equipment ADJ. Condition
Picture of Monitor TV E-E mode
monitor TV
ADJ. Location ADJ. Value
VR (RFAGC) S/hJis best point
(on the IFcircuit)
1.
2.
3.
4.
Connect the monitorlVto VHF/UHF ANTENNA OUTPUT
terminal.
Connect the VHF antenna to VHFIUHF ANTENNA INPUT
terminal.
Receive the middle electrical field (70 dB~ -90 dB~) of the
VHF high channel, and slowly turn VR (RF AGC) from the
point where snow-noise is present to the point where it
just disappears from the monitor TV.
Confirm by monitor TVthatthere is no beat and saturation
(S/N is best point) when receiving any TV channel.
3. TEST POINT FOR TAPE PATHADJUSTMENT
Test point TP182 (ENV) and TP183 (SW-P) for tape path adjustment is shown in Figure below.
For adjustment, refer to the Mechanism Service Technical lnformation(WM-530599 and MS531346).
P1BOS8WC-T3
TP181 REC Current -1/ \
VP-1 PWB Assembly Fig. 3.1
–13–

–bl–
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SIWd SISSVH3%13N18V3
.—— —
“ONSQkJd WMO1 NOIldIWS30

VHR430
UPPER CYLINDER(SOLDER TYPE)
PART N0.613-150-7166
UPPER CYLINDER(PUSH-ON TYPE)
PART N0.613-114-2824

--c
1MECHANISMPARTS
LOCATION PARTS NO&
HECHANISIIIPARTS1
co-1
co-4
CD-5
CD-6
CD-7
co-8
CD-9
co-lo
CO-11
CD-12
CD-13
CD-14
CO-15
CD-16
CD-17
CD-18
CD-19
CD-20
CD-21
co-22
CD-24
CD-27
\CD-28
CD-31
MA-1
MA-2
MA-3
MA-4
MA-5
MA-6
OR
MA-7
OR
613 142 9581
613 022 0585
407098 3201
411 015 9801
613022 1643
613 022 0073
613 022 2695
613 141 6109
613 139 8962
613 022 2626
613021 9657
411 027 1305
613 095 0949
411 106 9208
6130220943
6130222619
613022 1667
613 022 2596
613 022 0097
613 022 1674
613 022 4064
613 124 5006
613 1256149
411 001 8702
613 1000391
613 085 79?6
613 021 9701
411 144 2803
411 109 1605
613 1357068
613 1357549
613 1357075
613 1432963
DESCRIPTION
COMPL,CfISSETTEMECHANISM
LID
PHOTO COUPLE PN150SAN
RING E 2.3
SPRING,LINK L
ASSYtGEAR,LEVER L
RACK
GEAR,LOCK
ASSY,LEUER,PINION
GEGR,PINION
ASSY,BRACKET,GE14R
SCR S-TPG BIN 2.6X4
SW,SPECIAL
SCR PF3N+SW+W2X9
HOLOER,TRANSISTOR
GEAR,IDLER
SPRING,GEAR MAIN
GEARoMAIN
ASSY,GEAR,LEUER R
SPRING,LINK R
BOARD,UNOER
LEVERsSAFETY SW
SPRING,SAFETY SW
SCR BIN 3X6
ASSY.LEUER,TENSION
SPRING,LEVER TENSION
ASSY,HOLDER,BAND
SCR PAN+SW+W 2.6X6
WASHER Y 2,6X6X0.25
ASSY,REEL,SUPPLY
ASSY,REEL,SUPPLY
ASSY,REEL,TAKE UP
,4SSY,REEL.TAKE UP
,
LOCATION
MA-8
OR
OR
MA-9
OR
MA-10
OR
MA-11
MA-12
OR
MA-15
MA-16
MA-17
MA-18
MA-19
MA-20
MA-21
MA-22
MA-23
MA-24
MA-25
MA-26
MA-27
MA-28
MA-29
MA-30
MA-31
MA-32
MA-33
MA-34
MA-35
MA-36
MA-37
MA-38
MA-39
PARTS NO.
412021 5306
412 015 89OO
412015 8504
411 109 1506
411 109 1407
613 135 7150
613 1429116
412 026 7305
613 135 7167
613 1429109
412 042 4302
613 135 7099
411 120 1301
613 135 7082
411 021 3107
613 120 9053
407 016 7205
613021 9?85
613 142 9086
613022 1612
613 022 1506
6130980106
613077 3647
613 022 1490
6130222374
613084 8871
6130220004
6130809216
6130862914
6130809209
411 109 3005
613022 2015
412015 9501
411 021 7907
4120454606
,--F
CB602700
DESCRIPTION MBO046U#
SPECIAL WASHER 5.1X6X0.3
SPECIAL W14SNER3.1X6X0.4
SPECIAL WASHER 3.1X6X0.5
WASHER Y 2.1X6X0.25
WASHER Y 2.IX5X0.25
GEOR.REEL SUPPLY
GEAR,REEL SUPPLY
SPECIAL WASHER 2.6X6X0.~
GEARREEL TAKE UP
GEARREEL TAKE UP
SPECIRL SCREW 2.6X4
COMPL,IDLER,CLUTCH
WASHER Y 2.IX4X0.25
ASSY,IDLER
SCR S-TPG BIN 2.6X8
COMPL PCB,MC-4
LEO LN59
ASSY,SLIDE,ACT PLATE
SLIOE,C BRAKE
SPRING,RETURN SLIDE
SPRING,SUB T
ASSY,BROKE SUB T
PULLEY,REEL
SPRING,SUB SUPPLY
SLIOE,ACT BRAKE
BRAKErSUB SUPPLY
ASSY,SLIOE,M PLATE
ASSY,BRAKE,SUPPLY
SPRING,MAIN BR(IKE
ASSY,BRAKE,TAKE UP
WASHER Y 2.6X5X0.5
LEUER,CONT PLATE
SPECIAL WASHER
SCR S-TPG BIN 4X12
SPECIRL WASHER 2.4X6X0.25
------------------- ------------------------------------------- I
Undesignated numeral shows
Locatlo%No.:MA- 9--15
‘“L kE5!!YM 39+&
–15–

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NOTLdIi0S30 “ON S18Wd NO11W301
-.

MECHANISM PARTS 2
----- Undesignated numeral shows
----
--- ‘1 Locatio% No.:MB-
-----
----- 82
80
4%Q
22 24-
12 81
b83- 23+
DR-7 $
DR-6 k;*A r’ -
1t
MECHANISM PARTS 3
Undesignatednumeralshows
Location No.:MC- 12+ y
N.S.P.
’40Uy’p
38
as service parts
12+ ?
,/</”J @+24
40-$ 38+&
35 ~’
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–17–
N.S.P.:Not available as service parts

–81–
S109?IXSZ 81
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81
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81
81
81
81
81
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LOCATION PARTS NO.
Q6001
OR
OR
OR
Q6002
OR
Q6051
OR
OR
OR
OR
Q6052
OR
OR
OR
Q6901
OR
OR
OR
OR
Q6902
OR
OR
OR
-OR
Q6903
OR
OR
OR
OR
Q6904
OR
Q6921
OR
405026 9103
405 114 7806
405 114 7905
405 1148001
405 018 2501
4050006104
4050044007
405006 1707
405 093 0508
4050044601
405006 1806
405 057 6201
405 057 6409
405 123 7002
405 123 7101
405 019 2005
405011 8401
405 093 0607
405 019 2807
405 011 8500
405004 4007
405006 1707
405 093 0508
405 004 4601
405006 1806
405019 2005
405 011 8401
405 093 0607
405 019 2807
405 011 8500
405 018 2501
4050006104
405 084 8209
405084 8308
(INTEGRATEDCIRCUITS)
IC101
OR
Iclll
IC161
OR
IC162
IC201
IC301
LOR
IC302
IC303
OR
IC351
IC511
IC512
IC602
OR
OR
IC691
IC692
OR
(DIGDES)
01003
OR
01008
OR
01009
L
4093260204
4093339900
409 2?7 6205
4090034501
409 1203401
410 1743200
4092622409
410211 6508
410211 5303
409314 2005
4093130903
4092434101
4093233109
4090677203
4092252309
410 1773702
4092836905
410 1726906
409 019 6209
409 026 8203
409057 5103
407007 9904
407 012 4406
407 007 9904
407012 4406
4070079904
DESCRIPTION
TR 2SK222-E(UHR-430 ONLY)
TR 2SK1104-P(UHR-43O ONLY)
TR 2SK1104-Q(UHR-43O ONLY)
TR 2SK1104-R(UHR-43O ONLY)
TR 2SC3399(UHR-430 ONLY)
TR 0TC144ES(UHR-430 ONLY)
TR 2SA608-E-SPA
TR 2SA933S-Q
TR KSA1175-Y
TR 2SA608-F-SPA
TR 2SA933S-R
TR 2SC4038-Q
TR 2SC4038-R
TR 2SD1991A-Q
TR 2SD1991A-R
TR 2SC536-E-SPA
TR 2SC1740S-Q
TR KSC2785-Y
TR 2SC536-F-SPA
TR 2SC1740S-R
TR 2SA608-E-SPA
TR 2SA933S-Q
TR KS01175-Y
TR 2SA608-F-SPA
TR 2SA933S-R
TR 2SC536-E-SPA
TR 2SC1740S-Q
TR KSC2785-Y
TR 2SC536-F-SPA
TR 2SC1740S-R
TR 2SC3399
TR 0TC144ES
TR 2SC2960-F-SPA(UHR-430ONLY)
TR 2SC2960-G-SPA(UHR-430ONLY)
IC LA7345AM
IC LA7345AM-MPS
IC LC89925
IC BA7021
IC LA7221
IC LC74760M-8797
IC LA7285M
IC LC866648V-5557(VHR-274EX ONLY)
IC LC866648U-5554(EXCEPT UHR-274EX)
IC LB1643
IC MN1381-L
IC MN1380-L
IC BU2896K
IC L5431
Ic PQ12RF11
IC AT24CO4-1OPC
IC LE24C04S1
IC X24C04P-C7346
IC LA791O(UHR-43O ONLY)
IC L5631(UHR-430 ONLY)
IC UPC574J(VHR-430 ONLY)
OIOOE GMAO1
OIOOE 1SS133
DIOOE GMAO1
OIOOE 1SS133
OIOOE GMAO1
LOCATION
01009
01601
OR
01602
OR
01611
OR
01621
OR
01622
OR
01671
OR
03001
OR
03101
OR
03107
OR
03121
OR
03122
OR
D3123
OR
03502
OR
03510
OR
05001
D5003
05004
D5006
D501O
D5013 A
D5101
05102
D5103
D5104
05105
D5108
05109
05110
OR
05112
06901
OR
06902
OR
06903
OR
06910
PARTS NO. DESCRIPTION
407 012 4406
407 007 9904
407 012 4406
407 007 9904
407 012 4406
407 070 7104
407 0536704
407 007 9904
407 0124406
407 007 9904
407 012 4406
407 007 9904
407 0124406
407 012 4406
4070079904
407 012 4406
4070079904
4070124406
407007 9904
407 012 4406
407 007 9904
407 012 4406
407007 9904
407012 4406
4070079904
407 007 9904
407 0124406
407 007 9904
4070124406
407 134 8900
407 078 2705
4070782705
407 0782705
407091 6704
407 151 3308
407 1535409
407 1292005
4070782705
4070782705
407 1006909
4070638903
407 0638903
407 0049709
4070058701
4070638903
4070124406
407 007 9904
4070124406
4070079904
4070124406
407 007 9904
407 1000006
(CRYSTALDEVICES)
Xlool 6450006012
OR 6450006029
OR 6450024436
X1621 6130028709
OR 613 127 1555
X3001 645 003 5852
OR 645003 4510
X3002 613 1090972
OR 613 1236387
OIODE 1SS133
OIOOE GMAO1
DIOOE 1SS133
DIOOE GMAO1
OIOOE 1SS133
ZENER DIODE GZS5.6X
ZENER DIODE MTZ5.6B
OIODE GMAO1
OIODE 1SS133
OIOOE GMRO1
OIODE 1SS133
OIOOE GMAO1(EXCEPT UHR-430)
DIODE 1SS133(EXCEPT UHR-430)
DIODE 1SS133
DIOOE GMAO1
OIOOE 1SS133(EXCEPT VHR-430)
OIODE GMAO1(EXCEPT VHR-430)
OIODE 1SS133
OIOOE GMAO1
OIOOE 1SS133
OIODE GMAO1
OIOOE 1SS133
OIODE GMAO1
DIOOE 1SS133
DIODE GMAO1
DIOOE GMAO1
DIODE 1SS133
OIODE GMAO1
DIOOE 1SS133
DIODE DBC1OG
DIODE 1SS244
DIODE 1SS244
OIOOE 1SS244
OIOOE APOIC
PHOTO COUPLE PC120FB
DIODE RK36LF-B1
DIODE RL2Z-LF-B1
OIODE 1SS244
OIODE 1SS244
DIODE AGO1
ZENER OIOOE MTZJ5.6C
ZENER OIODE MTZJ5.6C
OIOOE OSK1OC
OIOOE ERA15-02
ZENER OIOOE MTZJ5.6C
OIOOE 1SS133
DIODE GMAO1
OIODE 1SS133
OIOOE GMAO1
OIODE 1SS133
DIOOE GMAO1
ZENER OIODE MTZJ33C(EXCEPT VHR-430)
OSC,CRYSTAL 4.433619MHZ
OSC)CRYSTAL 4.433619MHZ
OSCrCRYSTAL 4.433619MHZ
CRYSTAL 17.734475MHZ
OSC)CRYSTAL 17.734475MHZ
OSCrCERAMIC 13.31MHZ
OSC,CERAMIC 13.31MHZ
OSCtCRYSTAL 32KHZ
OSC,CRYSTAL 32.768KHZ
–19-