RCA 27V412T Technical Service Data

MISCELLANEOUS ADJUSTMENTS
Page 1 SET 5303
HIGH VOLTAGE TEST
High voltage must not be higher than 31.8kV at any beam current.
X RAY PROTECTION TEST
Tune the set to receive a crosshatch signal. Apply an external power supply
to the positive lead of C249 (observe polarity). Slowly increase the voltage
from the supply. The set must shut down and remain off when the voltage
reaches 30V.
B+
Tune the set to receive a crosshatch signal, set the preset picture mode to
normal, and adjust VR802 for 130V ±0.5V at the positive lead of C422.
RF AGC
The RF AGC is factory preset at the time of manufacture for optimum
operation over a wide range of RF signal input conditions and should not
need readjustment, unless there is cable TV adjacent channel interference
or picture bending or channel 6 color beats because of excessive RF signal
input, this can occur if the receiver is located too close to the transmitting
tower. The signal should be attenuated at the antenna to reduce the signal
to a satisfactory level.
NOTE: Adjusting the RF AGC to extreme limits of its parameters unusu-
ally provides a poor signal to noise ratio.
SCREEN
Tune the set to receive a crosshatch signal, set the preset picture mode to
normal and set all of the picture controls (brightness, contrast, etc) to
midrange. Enter the service mode and preset the menu 1 values. Set RC,
GC, and BC to 80, GD and BD to 40. While still in the service mode, press
the input button on the remote and the vertical will collapse. Adjust the
screen control to produce a dim horizontal line on the CRT.
COLOR TEMPERATURE
Test point Display
Adjust: Menu 1 RC Red Cutoff
Menu 1 GC Green Cutoff
Menu 1 BC Blue Cutoff
Menu 1 GD Green Drive
Menu 1 BD Blue Drive
Set color picture temperature to normal and set all of the picture controls
(brightness, contrast, etc) to midrange. Tune the set to receive a gray scale
stairstep test pattern. Enter the service mode and adjust the values for
cutoff and drive controls to obtain proper color tracking, no tinting of black
and white and shades of gray, and color temperature is 9300 degrees - X =
284, Y = 299.
SUB BRIGHTNESS
Tune the set to receive a gray scale stairstep signal from the A/V inputs. Set
picture color temperature to normal, Set all of the picture controls
(brightness, contrast, etc) to midrange. Enter the service mode and select
menu 5. Adjust the value of BRTC sub brightness to just light the second
dark bar, making sure the first bar stays black.
Test point Display
Adjust: Menu 3 HPOS6 H Position
Menu 3 PARA6 H Parabola
Menu 3 TRAP6 H Trapazoid
Menu 3 HSIZE6 H Size
Menu 3 CNRT6 H Corner Top
Menu 3 CNRB6 H Corner Bottom
Menu 2 HIGHT6 Height
Menu 2 VLIN6 Linearity
Menu 2 VP60 Vertical Center
Menu 2 VSC6 Vert S Correct
NOTE: Confirm correct convergence and purity before adjusting geometry.
Tune the set to receive a circular test pattern to make visual geometry
adjustments. Enter the service mode. Adjust menu 2 and menu 3 values for
the least amount of geometric distortion approximately 7% overscan.
SERVICE MODE
NOTE: Pressing the 1 and input buttons on the remote will shut the set
down if you are in the service mode.
To enter the service mode, press and hold the volume down button on the
set while pressing the info/del button on the remote. Menus 1 thru 10 can
be accessed directly using the remote keypad number buttons. For menu 11
press the 1 and notepad buttons on the remote; menu 12 press the 1 and
caps buttons on the remote; menu 13 press 1 and info/del buttons on the
remote; menu 14 press 1 and sleep buttons on the remote; menu 15 press 1
and calendar buttons on the remote; 16 press 1 and insert buttons on the
remote; menu 17 press 1 and FAV buttons on the remote; menu 18 press 1
and go back buttons on the remote. If any of the service mode menu items
have been adjusted, press the sound button to save the settings, and exit the
service mode.
ITEM SETTING
Menu 1
FAC01
RC 76
GC 86
BC 7B
GD 33
BD 2E
Menu 2
FAC02
HIGHT6 19
VP60 07
VLIN6 0A
VSC6 0A
VBLK6 0A
VCEN6 2B
Menu 3
FAC03
HPOS6 13
PARA6 1C
TRAP6 22
HSIZE6 1F
CNRT6 0A
CNRB6 09
VEHT6 03
HEHT6 03
Menu 4
FAC04
CNTX 7F
CNTN 08
BRTX 20
BRTN 20
COLX 35
COLN 00
TNTX 30
TNTN 30
Menu 5
FAC05
BRTC 3C
COLC 23
COLP 00
SCOL 07
SCNT 06
CNTC 4C
TNTCT 37
TNTCV 37
ITEM SETTING
Menu 6
FAC06
ST3 20
SV3 20
SV4 19
SVD 19
ASSH 07
SHPX 10
SHPN 2A
Menu 7
FAC07
MOD1 60
MOD2 B0
MOD3 70
OPT 36
OPTM1 C1
OPTM2 00
HDCNT 00
HSTOP FF
Menu 8
FAC08
RFAGC 26
BRTS 00
OSD 21
OSDF 53
CCD OSD 4A
CCD OSDF 65
TXCX 1F
RGCN 16
Menu 9
FAC09
V01 46
V25 5A
V50 65
V100 7F
VOLMAX 32
CURTCEN A5
GATE 2A
VOL-OUT 73
Menu 10
FAC10
MODE4 22
MODE5 0B
MODE6 1E
MODE7 C4
MODE8 2D
MODE8 C2
ITEM SETTING
Menu 11
FAC11
MPB STR 43
MPB HMC 0D
MPB HP 07
MPB LP 11
MPB LIM 00
SUB FRE 28
SUB HP 02
VOL MAI 00
Menu 12
FAC12
SVM 05
SVM1 05
OSD2 20
OSDF2 64
PYNX 28
PYNN 18
PYXS 22
PYNS 10
Menu 13
FAC13
CLTM 4F
CLVO 48
CLVS 4F
ABL 27
DCBS 12
FLGO 82
FLG1 0D
Menu 14
FAC14
HAFC 09
AGCC 1C
NOIS 01
ONTM 08
NSHP 1A
PVLVL 80
PLMT 80
ITEM SETTING
Menu 15
FAC15
RC-C FC
GC-C 02
BC-C 00
GD-C FD
BD-C 0A
Menu 16
FAC16
RC-W 04
GC-W 01
BC-W 02
GD-W FB
BD-W E7
YUVGC F7
YUVBC 08
Menu 17
FAC17
D-COL 32
D-BRI 32
D-CON 5A
D-SHP 32
Menu 18
FAC18
S-COL 32
S-BRI 32
S-CON 4B
S-SHP 32
SERVICE MODE CHART

RCA 27V412T Specifications

General

Brand	RCA
Model	27V412T
Category	TV
Language	English