JVC AV-14FR10, JVC AV-14F10 – HOW TO ENTER THE SERVICE MODE, SCHEMATIC DIAGRAM, SERVICE MODE ADJUSTMENTS

JVC AV-14FR10, JVC AV-14F10 – how to enter the service mode, schematic diagram, service mode adjustments

How to enter the service mode - JVC AV-14FR10/AV-14F10, AV-1434TEE/AV-1434EE, AV-14FTT2/AV-14FTG2/-A – circuit diagram

Replacement of memory IC

This model uses memory ICs. This memory IC data are for proper operation of the video and deflection circuits.  When replacing memory ICs, be sure to use ICs written with the initial values of data.

Procedure for replacing memory IC
(1) Power off
Switch the power off and disconnect the power plug from the wall outlet.
(2) Replace ICs
Be sure to use memory ICs written with the initial data values.
(3) Power on
Connect the power plug into the wall outlet and switch the power on.
(4) Check and set SYSTEM CONSTANT SET. It must not adjust without adjustment signals.
1) Press the DISPLAY key and the PICTURE MODE key of the REMOTE CONTROL UNIT simultaneously. [To display the Service Menu]
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) While the SERVICE MENU is displayed, again press the DISPLAY key and
PICTURE MODE key simultaneously, and the SYSTEM CONSTANT SET screen will be displayed.
4) Check the setting values of the SYSTEM CONSTANT SET of Table  If the value is different, select the setting item with the MENU ▼/▲key, and set the correct value with the MENU - / + key.
5) Press the DISPLAY key twice, and return to the normal screen.
(5) Receive channel of setting
Refer to the OPERATING INSTRUCTIONS and set the receive channels (channels preset) as described
(6) User Setting
Check the user setting value of Table 2, and if setting value is different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.
NOTE
Although the key position of the RM-C90 remote control unit is different from that of the RM-C364 remote control unit, the functions of both units are the same So please use the attached diagram for the RM-C90 remote control unit for the RM-C364.
By the way, MENU -/+ Key functions in the same manner as for / key.

Adjustment of the SERVICE MENU is made on the basis of the initial setting values ; however, the new setting values which set the screen in its optimum condition may differ from the initial setting.

Do not change the initial Setting Values of the Setting (Adjustment) items not listed In “ADJUSTMENT”.

Replacement of ic301 (if v/c decoder)

For the IC301(IF V/C DECODER) of this model, all data are written in the micro-computer. So, write the data in the microcomputer in accordance with the following procedures before starting adjustment.

(1) Turn the POWER OFF.
(2) Replace the IC301 with a new one.
(3) While pressing MENU button and VOL+ button ON the FRONT CABINET simultaneously, turn the POWER ON. When the POWER is turned ON, the data is written in the micro-computer immediately.

Service adjustment

There are 2 way of adjusting this TV: One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.
2. The adjustment with the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to its optimum condition may differ from the initial setting values.
3. Make sure that connection is correctly made to AC power source.
4. Turn on the power of the set and equipment before use, and start the adjustment procedures after waiting at least 30 minutes.
5. Unless otherwise specified, prepare the most suitable reception or input signal for adjustment.

6. Never touch any adjustment parts, which are not specified in the list for this adjustment VRs, transforms, condensers, etc.

Measuring instrument and fixtures
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL / SECAM / NTSC]
4. Remote control unit.

The adjustment using SERVICE MENU
The following adjustment items use the SERVICE MENU in the series of the adjustment. The adjustments are made on the basis of the initial setting values. The adjustment values which adjust the screen to the optimum condition can be different from the initial setting values.
With the SERVICE MENU, various settings can be made, and they are broadly classified in the following items of settings.
1.IF ････････ Adjustment of the IF circuits.
2.V/C ･････ Adjustment of the VIDEO/CHROMA circuit.
3.･･･････････････ Adjustment of the DEFLECTION circuit.
4.VSM PRESET ･･･････ Adjustment of the initial setting values of VSM condition as STANDARD, SOFT and BRIGHT.
(VSM : Video Status Memory)
5.PRESET ･･････････ Adjustment of the RF circuit [Do not adjust].
6.TURBO TIMER････････････ For quick setting the TIMER count value, adjustable not only by minuets but also by second.
[Should be OFF].

Key operation of the SERVICE MENU
[Enter to SERVICE MENU]
Press the DISPLAY key and the PICTURE MODE key of the REMOTE CONTROL UNIT simultaneously. Then enter the SERVICE MENU mode,

To Exit from SERVICE MENU
When complete the adjustment work, press the DISPLAY key to return to the SERVICE MENU.
And then press the DISPLAY key again, return to the normal screen.
[Select from SERVICE MENU]
In SERVICE MENU, press the number (1～6) key of the remote control unit, to select any of the adjustment items.
The colours which selected item characters are changed.

Method of setting

IF
 VCO

✓ 1 Key･････････････････････････ Select 1.IF.
✓ 1 Key･････････････････････････ Select 1.VCO
✓ The VCO (CW) screen will be displayed a allow mark when the AFC voltage is at a certain level.
✓ DISPLAY Key･･････････････････ As you press this key twice, you will return to the SERVICE MENU.

DELAY POINT
✓ 1 Key･････････････････････････ Select 1.IF.
✓ 2 Key･････････････････････････ Select 2.DELAY POINT.
✓  MENU -/+ ･････････････････････ Set (adjust) the setting values of the setting items.
DISPLAY Key ････････････････････ When this is pressed twice, you will return to the SERVICE MENU.

V/C, 3.DEF and 4.VSM PRESET
✓ 2~4Key ･･･････････････････････ Select one from 2. V/C, 3. DEF and 4. VSM PRESET.
✓ MENU ▼/▲ Key ･･････････････ Select setting items.
✓ MENU -/+ ･････････････････････ Adjust the values of the items.
✓  DISPLAY Key･･････････････････ When this is pressed, return to the SERVICE MENU.

TURBO TIMER
✓ By pressing the 6 key, you can change the ON or OFF ( should be OFF).
(Should be OFF)
 If it is ON, the timer in TIMER mode changes from 1 minute into 1 sec temporarily.
(It is easier to checks the Operation of TIMER)
If you turn the TV power off, this setting becomes OFF automatically.

Service menu flow chart

Schematic [full]

Click on the pictures to Zoom In