[TechAssist] Re: Philips service menu CCB252AT31
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 21 Nov 2003 10:38:40 -0500
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note: "CBA" is abbreviation for "Circuit Board Assembly."
NOTE:
Electrical adjustments are required after replacing circuit components and
certain mechanical parts. It is important to perform these adjustments only
after all repairs and replacements have been completed. Also, do not attempt
these adjustments unless the proper equipment is available.
Test Equipment Required
1. NTSC Pattern Generator (Color Bar w/White Window, Red Color, Dot Pattern,
Gray Scale, Monoscope, Multi-Burst)
2. AC Milli Voltmeter (RMS)
3. Alignment Tape (VFMS0001H6), Blank Tape
4. DC Voltmeter
5. Oscilloscope: Dual-trace with 10:1 probe,
V-Range: 0.001~50V/Div,
F-Range: DC~AC-60MHz
6. Frequency Counter
7. Plastic Tip Driver
x-Ray Protection Test
X-ray protection test should be done when replacing any parts of this
chassis.
1. Short test points J535 and J536 (on H.V. CBA).
2. Confirm that the main power turns off.
3. If the main power does not turn off, then replace the following parts
(D591, Q591, R592, R593, R594 and IC201).
4. Perform steps 1 through 3 again.
PREPARATION FOR SERVICING
How to Use U21 Deck Extension Cable
(1) Remove Deck Mechanism Assembly. If needed, remove the Main CBA from Tray
Chassis. Refer to "Cabinet Disassembly Instructions."
(2) Connect Main CBA and Deck with the U21 Deck Extension Cable (A) as shown
in Fig. 1. And connect Main CBA and Deck with U21 Deck Extension cable (B)
as shown in Fig. 1. Connect a clip on U21 Deck Extension Cable (B) to J264
on the Main CBA.
(U21 Deck Extension Cable: 4835 310 57491)
(3) Set SW212(LD-SW) on the Main CBA to Service position shown in Fig.1.
Note 1: There are 3 types of U21 Deck Extension Cable (A). They are for 2
Head, 4 Head, and Hi-Fi. Use a connector indicated as shown. Be careful not
to let the unused connector contact other parts.
Note 2: Some noise will be present in the playback picture when the
extension cable is used.
Note 3: Before installing the Deck Assembly, be sure to align two triangle
marks of SW1001 on U21 Deck Extension Cable (B). Then, install the Deck
Assembly while aligning the hole of Cam Gear with the pin of SW1001, the
shaft of Cam Gear with the hole of SW1001 as shown in Fig.2.
How to Enter the Service Mode
Caution: 1
1. Optical sensors system are used for Tape Start and End Sensor on this
equipment. Read this page carefully and prepare as described on this page
before starting to service; otherwise, the unit may operate unexpectedly.
Preparing: 1
1. Cover Q202 (START SENSOR) and Q201 (END SENSOR) with Insulation Tape or
enter the service mode to activate Sensor Inhibition automatically.
Note: Avoid playing, rewinding or fast forwarding the tape to its beginning
or end, because both Tape End Sensors are not active.
1. Turn set on.
2. Turn set off and at the front of the unit while pressing the 2-7-1 and
mute keys simultaneously on the remote control.
3. This procedure must be done promptly prior to the power supply
discharging completely.
4. To exit the service mode power the unit off at the Front key board.
Details are as follows.
Key
Adjustment Mode
MENU
Picture adjustment mode: Press the MENU button to change from BRT
(Bright), *CNT (Contrast), *CLR (Color), *TNT(Tint) and *V-T. Press CH
UP/DOWN key to display Initial Value, Maximum and Minimum cyclically.
*Marked items are not necessary to adjust normally.
0
C-Trap adjustment mode: See adjustment instructions.
1
No need to use.
2
AGC/H adjustment mode: See adjustment instructions.
3
Auto AFT adjustment mode: See adjustment instructions .
4
Auto record mode: Perform recording (15 Sec.)-->Stop-->Rewind (Zero
return) automatically.
5
Head switching point adjustment mode: See adjustment instructions.
6
No need to use.
7
Purity check mode: Shows Red, Green or Blue on the screen when the CH
UP/DOWN keys are pressed.
8
H. Shift adjustment mode: See adjustment instructions.
9
V.size/V. shift adjustment: See adjustment instructions.
Caution: 2
1. The deck mechanism assembly is mounted on the Main CBA directly, and
SW211 (REC-SAFETY SW) is mounted on the Main CBA. When deck mechanism
assembly is removed from the Main CBA due to servicing, this switch can not
be operated automatically.
Preparing: 2
1. To eject the tape, press the STOP/EJECT button on the unit (or Remote
Control).
2. When you want to record during the Service mode, press the Rec button
while depressing SW211 (REC-SAFETY SW) on the Main CBA.
How to Set up the Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press "WAKE-UP/SLEEP" button on the service remote control unit.
DC (+B) Adjustment (AC Power) (CCB092AT)
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and unit does not operate
correctly.
Test Point
Adjustment Point
Mode
Input
J553(+B) J563(GND)
VR1620
--
--
Tape
M. EQ.
Spec.
--
DC Voltmeter
+117 ± 0.5V DC
Note: J553(+B), J563(GND), VR601 -- H.V. CBA
VR1620 -- Power Supply CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Voltmeter to J553(+B) and J563(GND).
3. Adjust VR1620 so that the voltage of J553(+B) becomes +117 ± 0.5V DC.
DC (+B) Adjustment (DC Power) (CCB092AT)
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and unit does not operate
correctly.
Test Point
Adjustment Point
Mode
Input
J553(+B) J563(GND)
VR1951
--
--
Tape
M. EQ.
Spec.
--
DC Voltmeter
+117 ± 0.5V DC
Note: J553(+B), J563(GND), VR601 -- H.V. CBA
VR1951 -- Power Supply CBA
1. Input 13.2V DC to DC Jack.
2. Connect DC Voltmeter to J553(+B) and J563(GND).
3. Adjust VR1951 so that the voltage of J553(+B) becomes +117± 0.5V DC.
DC (+B) Adjustment (CCB130AT, CCB132AT & CCB190AT)
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and unit does not operate
correctly.
Test Point
Adjustment Point
Mode
Input
J297 (+B)
J257 (GND)
VR601
--
--
Tape
M. EQ.
Spec.
--
DC Voltmeter
+105 ± 0.5V DC (CCB130AT, CCB132AT, CCB13B1, CCB134AT)
+114 ± 0.5V DC (CCB190AT, CCB192AT, CCB193AT, CCB194AT)
Note: J297(+B), J257(GND), VR601 -- Main CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Voltmeter to J297(+B) and J257(GND).
3. Adjust VR601 so that the voltage of J297(+B) becomes +105 ± 0.5Vdc.
(CCB130AT, CCB132AT, CCB13B1, CCB134AT)
4. Adjust VR601 so that the voltage of J297(+B) becomes +114 ± 0.5Vdc.
(CCB190AT, CCB192AT, CCB193AT, CCB194AT)
DC 128V (+B) Adjustment (CCB252AT, CCB255AT)
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and unit does not operate
correctly.
Test Point
Adjustment Point
Mode
Input
TP601(+B)
TP602(GND)
VR601
--
--
Tape
M. EQ.
Spec.
--
DC Voltmeter
+128 ± 0.5V DC
Note: TP601(+B), TP602(GND), VR601 -- Power Supply/H.V. CBA
1. Connect the unit to AC Power Outlet.
2. Connect DC Voltmeter to TP601(+B) and TP602(GND).
3. Adjust VR601 so that the voltage of TP601(+B) becomes +128 ± 0.5Vdc.
Auto AFT (VCO) Adjustment
Purpose: To operate AFT correctly.
Symptom of Misadjustment: AFT does not work correctly and/or synchronization
is faulty.
Test Point
Adjustment Point
Mode
Input
--
--
VIDEO
--
Tape
M. EQ.
Spec.
--
--
--
1. Set the unit to the VIDEO mode with no signal input.
2. Enter the Service mode. Then press number "3" button on the remote
control unit.
3. If the screen color changes to "Green" then this adjustment is finished.
4. If the screen color changes to "Red" then this adjustment is failed.
Repeat steps 1 and 2 or check relative circuit or parts (IC).
TV AGC Adjustment
Purpose: Set AGC (Auto Gain Control) Level.
Symptom of Misadjustment: AGC does not synchronize correctly when RF input
level is too weak and picture distortion may occur if it is too strong.
Test Point
Adjustment Point
Mode
Input
INT. MONITOR
J39
(CCB132, CCB13B1, CCB134, CCB192, CCB193, CCB194)
TP009/014 (CCB252, CCB255)
CH. up/down buttons
---
Color Bar 67.25MHz 60dBuV
Tape
M. EQ.
Spec.
---
Pattern Generator DC Voltmeter
+2.3 ± 0.3Vdc
+2.5 ± 0.3Vdc
+2.6 ± 0.3Vdc
1. Enter the Service mode. Then press number 2 button on the remote control
unit.
2. Receive the Color Bar signal for channel 4 (67.25MHz). (RF Input Level:
60dBuV)
3-1. Press CH. up/down buttons so that the voltage of (INT. MONITOR --
CCB092, CCB130, CCB190) (J39 -- CCB132, CCB13B1, CCB134, CCB192, CCB193,
CCB194) becomes +2.3.± 0.3V DC. (Tuner Type No. TEDH9X203A)
3-2. Press CH. up/down buttons so that the voltage of (INT. MONITOR --
CCB092, CCB130, CCB190) (J39 -- CCB132, CCB13B1, CCB134, CCB192, CCB193,
CCB194) becomes +2.5.± 0.3V DC. (Tuner Type No. B8055AR)
3-3. Press CH. up/down buttons so that the voltage of (INT. MONITOR --
CCB092, CCB130, CCB190) (J39 -- CCB132, CCB13B1, CCB192, CCB193)
(TP009/014 -- CCB252, CCB255) becomes +2.6.± 0.3V DC. (Tuner Type No.
NJH3022U254)
3-4. Press CH. up/down buttons so that the voltage of (J39 -- CCB134AT,
CCB194 becomes +2.6.± 0.3V DC. (Tuner Type No. B8045AR)
4. Turn the power off and on again.
H Adjustment
Purpose: To get correct horizontal position and size of screen image.
Symptom of Misadjustment: Horizontal position and size of screen image may
not be properly displayed.
Test Point
Adjustment Point
Mode
Input
INT. MONITOR
R583 (CCB132, CCB255, CC13B1, CCB134, CCB192, CCB193, CCB194)
CH. up/down buttons
VIDEO
---
Tape
M. EQ.
Spec.
---
Frequency Counter
15.734 kHz ± 300 Hz
Note: INT. MONITOR -- Main CBA
(R583 for CCB132, CCB255, CCB13B1, CCB134, CCB192, CCB193, CCB194)
1. Connect Frequency Counter to INT. MONITOR (R583 for CCB132, CCB255,
CCB13B1, CCB134, CCB192, CCB193, CCB194).
2. Set the unit to the VIDEO mode and no input is necessary. Enter the
Service mode.
3. Operate the unit for at least 20 minutes.
4. Press "2" button on the remote control unit and select H-Adj Mode. (Press
"2" button, then display will change H-Adj and AGC.)
5. Press CH up / down buttons on the remote control unit so that the display
will change "0" to "7." At this moment, choose display "0" to "7" when the
Frequency counter display is closest to 15.734kHz ± 300Hz.
6. Turn the power off and on again.
C-Trap Adjustment (CCB130AT, CCB132, CCB190AT, CC13B1, CCB134, CCB192,
CCB193, & CCB194)
Purpose: To get minimum leakage of the color signal carrier.
Symptom of Misadjustment: If C-Trap Adjustment is incorrect, stripes will
appear on the screen.
Test Point
Adjustment Point
Mode
Input
J291 (B-Out)
CH. up/down buttons
---
Color Bar
Tape
M. EQ.
Spec.
---
Oscilloscope
200 mVp-p
Note: J291 (B-Out) --- Main CBA
1. Connect Oscilloscope to J291.
2. Input a color bar signal from RF input. Enter the Service mode.
3. Press "0" button on the remote control unit and select C-TRAP Mode.
4. Press CH up/down buttons on the remote control unit so that the carrier
leakage B-Out (3.58MHz) value becomes 200 mVp-p on the oscilloscope.
5. Turn the power off and on again.
C-Trap Adjustment (CCB092AT, CCB252, CCB255)
Purpose: To get minimum leakage of the color signal carrier.
Symptom of Misadjustment: If C-Trap Adjustment is incorrect, stripes will
appear on the screen.
Test Point
Adjustment Point
Mode
Input
TP017(B-Out)
CH up/down buttons
---
Color Bar
Tape
Spec.
---
Oscilloscope
200mV P-P
Note: TP017 (B-Out)-- Main CBA
1. Connect Oscilloscope to TP017.
2. Input a color bar signal from RF input. Enter the Service mode.
3. Press "0" button on the remote control unit and select C-TRAP Mode.
4. Press CH up/down buttons on the remote control unit so that the carrier
leakage B-Out (3.58MHz) value becomes 200mVp-p on the oscilloscope.
5. Turn the power off and on again.
V. Size Adjustment
Purpose: To obtain correct vertical height of screen image.
Symptom of Misadjustment: If V. Size is incorrect, vertical height of image
on the screen may not be properly displayed.
Test Point
Adjustment Point
Mode
Input
--
CH up/down buttons
--
Monoscope
Tape
M. EQ.
Spec.
--
Pattern Generator
90±5%
Note:
1. Enter the Service mode. Press "9" button on the remote control unit and
select V-S Mode. (Press "9" button then display will change to V-P and V-S).
2. Input monoscope pattern.
3. Press CH up/down buttons on the remote control unit so that the monoscope
pattern is 90 ± 5% of display size and the circle is round.
V. Shift Adjustment
Purpose: To obtain correct vertical position of screen image.
Symptom of Misadjustment: If V. position is incorrect, vertical position of
image on the screen may not be properly displayed.
Test Point
Adjustment Point
Mode
Input
---
CH. up/down buttons
---
Monoscope
Tape
M. EQ.
Spec.
---
Pattern Generator
90 ± 5%
Note:
1. Enter the Service mode. Press "9" button on the remote control unit and
select V-P Mode. (Press "9" button then display will change to V-P and V-S).
2. Input monoscope pattern.
3. Press CH up/down buttons on the remote control unit so that the top and
bottom of the monoscope pattern are equal to each other.
H. Shift Adjustment
Purpose: To obtain correct horizontal position and size of screen image.
Symptom of Misadjustment: Horizontal position and size of screen image may
not be properly displayed.
Test Point
Adjustment Point
Mode
Input
---
CH. up/down buttons
---
Monoscope
Tape
M. EQ.
Spec.
---
Pattern Generator
90 ± 5%
Note:
1. Enter the Service mode. Press "8" button on the remote control unit and
select H-P Mode.
2. Input monoscope pattern.
3. Press CH up/down buttons on the remote control unit so that the left and
right side of the monoscope pattern are equal to each other.
4. Turn the power off and on again.
Cut-off Adjustment
Purpose: To adjust the beam current of R, G, B, and screen voltage.
Symptom of Misadjustment: White color may be reddish, greenish or bluish.
Test Point
Adjustment Point
Mode
Input
---
Screen-Control
Ext.
Black Raster/ White Raster
Tape
M. EQ.
Spec.
---
Pattern Generator
See Reference
Notes Below
Note: Screen Control FBT -- H/V CBA
F.B.T = Flyback Transformer
Use the Remote Control Unit
1. Degauss the CRT and allow CRT to operate for 20 minutes before starting
the alignment.
2. Set the screen control to minimum position. Input the Black raster signal
from RF input.
3. Enter the Service Mode. Dimmed horizontal line appears on the CRT.
4. Press the "VOL up/down" button. (Press "VOL up/down" then display will
change CUT OFF/DRIVE, VCO adjustment, Analog OSD adjustment).
5. Choose CUT OFF/DRIVE Mode then press "1" button. This adjustment mode is
CUT OFF (R).
6. Press the "CH up/down" button until the horizontal line becomes white.
7. Choose CUT OFF/DRIVE mode then press "2" button. This adjustment mode is
CUT OFF (G). Press "CH up/down" until the horizontal line becomes white.
8. Choose CUT OFF/DRIVE Mode then press "3" button. This adjustment mode is
CUT OFF (B). Press "CH up/down" until the horizontal line becomes white.
9. Input the White Raster Signal from Video In.
10. Choose CUT OFF/DRIVE mode then press "4." Adjust the RED DRIVE as needed
with the CH up/down buttons.
11. Choose CUT OFF/DRIVE mode then press "5." Adjust the BLUE DRIVE as
needed with the CH up/down buttons.
12. Turn the power off and on again.
Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is incorrect, proper brightness
cannot be obtained by adjusting the Brightness Control.
Test Point
Adjustment Point
Mode
Input
---
CH up/down buttons
---
SYMPTE
7.5 IRE
Tape
M. EQ.
Spec.
---
Pattern Generator
See Below
Note: SYMPTE Setup level -- 7 IRE
1. Enter the Service Mode. Then input SYMPTE signal from RF input.
2. Press MENU button. (Press MENU button then display will change B R T, C N
T, T N T, V-T and SHP). Select BRT and press CH up/down buttons so that the
bar is just visible (See above figure).
3. Turn the power off and on again.
Focus Adjustment
Purpose: Set the optimum Focus.
Symptom of Misadjustment: If Focus Adjustment is incorrect, blurred images
are shown on the display.
Test Point
Adjustment Point
Mode
Input
---
Focus Control
---
Monoscope
Tape
M. EQ.
Spec.
---
Pattern Generator
See Below
Note: Focus VR (FBT) --- H/V CBA
FBT = Flyback Transformer
1. Operate the unit more than 30 minutes
2. Face the unit to the East and degauss the CRT using a Degaussing Coil.
3. Input the monoscope pattern.
4. Adjust the Focus Control on the FBT to obtain clear picture.
Head Switching Position Adjustment
Purpose: Determine the Head Switching Point during Playback.
Symptom of Misadjustment: May cause Head Switching Noise or Vertical Jitter
in the picture.
Note: Unit reads Head Switching Position automatically and displays it on
the screen (Upper Left Corner).
1. Playback test tape (VFMS0001H6).
2. Enter the Service Mode. Then press the number 5 button on the remote
control unit.
3. The Head Switching position will display on the screen; if adjustment is
necessary follow step 4. 6.5H(412.7us) is preferable.
4. Press "CH up" or "CH down" button on the remote control unit if
necessary. The value will be changed in 0.5H steps up or down. Adjustable
range is up to 9.5H. If the value is beyond adjustable range, the display
will change as:
Lower out of range; 0.0H
Upper out of range; -.-H
5. Turn the power off and on again.
SIF Adjustment
Purpose: To set the SIF (Sound Intermediate Frequency).
Symptom of Misadjustment: Audio may not sound correctly.
Note: This adjustment automatically done by the chrominance IC (IC301).
CCS Text Box Location
When replacing the CRT, the CCS Box might not stay in appropriate position.
Then, replace microcomputer.
Note: This adjustment automatically done by the microcomputer.
The following two adjustments normally are not attempted in the field. They
should be done only when replacing the CRT then adjust as a preparation.
Purity Adjustment
Purpose: To obtain pure color.
Symptom of Misadjustment: If Color Purity Adjustment is incorrect, large
areas of color may not be properly displayed.
Test Point
Adjustment Point
Mode
Input
---
Deflection Yoke Purity Magnet
---
Red Color
Tape
M. EQ.
Spec.
---
Pattern Generator
See Below
1. Set the unit facing east.
2. Operate the unit for over 30 minutes before adjusting.
3. Fully degauss the unit using an external degaussing coil.
4. Set the unit to the AUX Mode which is located before CH2 then input a red
raster from video in.
5. Loosen the screw on the Deflection Yoke Clamper and pull the Deflection
Yoke back away from the screen. (See Fig. 6)
6. Loosen the Ring Lock and adjust the Purity Magnets so that a red field is
obtained at the center of the screen. Tighten Ring Lock. (See Fig. 5, 6)
7. Slowly push the Deflection Yoke toward the bell of the CRT and set it
where a uniform red field is obtained.
8. Tighten the clamp screw on the Deflection Yoke.
Convergence Adjustment
Purpose: To obtain proper convergence of red, green and blue beams.
Symptom of Misadjustment: If Convergence Adjustment is incorrect, the edge
of white letters may have color edges.
Test Point
Adjustment Point
Mode
Input
---
C.P. Magnet (RB), C.P. Magnet (RB-G), Deflection Yoke
---
Dot Pattern or Crosshatch
Tape
M. EQ.
Spec.
---
Pattern Generator
See Below
1. Set the unit to the AUX Mode which is located before CH2 then input a Dot
or crosshatch pattern.
2. Loosen the Ring Lock and align red with blue dots or Crosshatch at the
center of the screen by rotating (RB) C.P. Magnets. (See Fig. 7)
3. Align red / blue with green dots at the center of the screen by rotating
(RB-G) C.P. Magnet. (See Fig. 8)
4. Fix the C.P. Magnets by tightening the Ring Lock.
5. Remove the DY Wedges and slightly tilt the Deflection Yoke horizontally
and vertically to obtain the best overall convergence.
6. Fix the Deflection Yoke by carefully inserting the DY Wedges between CRT
and Deflection Yoke.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 21, 2003 10:40 AM
Subject: [TechAssist] Philips service menu CCB252AT31
> Philips
> Model CCB25AT31 25" combo
>
> Could someone post how to access service menu on this set?
>
> Thank you..
>
> Bob,
>
> Bobs TV Worcester, ma
>
> woodman1@xxxxxxxx
>
> Main 508-853-1482
> Fax 508-853-1480
>
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