What is the crystal value used in PSR-E-403 Keyboard in DMLCD board/ and the ic number is YMW-767-VT

Question edited for clarity, "i before e except after c".

PSR-255 GRE Handheld Scanner

* Frequency 26-54, 66-88, 137-174, 380-512MHz
* Modes AM, FM * Memories 50 + 1 monitor
* Search speed 50 steps/sec * Scan speed 25Ch/sec
* Scan delay 2 secs * Priority channel
* Antenna rubber duck, BNC * LCD
* Audio 200mW into 8 Ohms int. speaker
* Power 6 x AA (not included), ext. power 9V DC
* Size 171 x 59 x 40mm
* Weight 240g with ant & batts

PSR-255 50-CHANNEL SCANNER OWNER'S MANUAL

-> RadioManual.eu <- http://www.radiomanual.info > schemi > GRE_...
Your new PSR-255 50-Channel Portable Scanner gives you direct access to over 26,000 exciting frequencies, including police and fire departments, ...
24 pages

PSR-255 - GRE / GRECOM

Rigpix https://www.rigpix.com > gre > psr255
May 18, 2023 - Type: VHF/UHF receiver/scanner ; Frequency range: 26-54 / 68-88 / 137-174 / 380-512 MHz ; Tuning steps: 5 / 12.5 KHz ; Frequency stability: ? ppm.

GRE PSR-255 Owner's Manual (Page 2 of 24)

ManualsLib https://www.manualslib.com > ... > Owner's manual
View and Download GRE PSR-255 owner's manual online. 50-CHANNEL SCANNER. PSR-255 scanner pdf manual download. FEATURES Your new PSR-255 50-Channel Portable ...

Albrecht AE55H / GRE PSR-255

Discriminator.nl https://www.discriminator.nl > index-en
The discriminator IC of the Albrecht AE55H and the identical GRE PSR-255, a Motorola MC3361, is hidden below a crystal (marked 10.245).

PSR-255 GRE Handheld Scanner - radioworld

Radioworld UK https://www.radioworld.co.uk > psr-255_gre_handhel...
PSR-255 GRE Handheld Scanner * Frequency 26-54, 66-88, 137-174, 380-512MHz * Modes AM, FM * Memories 50 + 1 monitor * Search speed 50 steps/sec * Scan speed ...
£64.94

It sounds like you are experiencing an issue with your Yamaha PSR-85 keyboard where the individual keys are out of tune with each other. Here are a few steps you can try to troubleshoot the issue:

1. Check the settings: Make sure that the keyboard is set to the correct tuning and that any pitch bend or transpose settings are set to the correct values.
2. Check for damage: Inspect the keyboard for any visible damage or debris that may be causing the keys to be out of tune.
3. Check for software updates: It's possible that there may be a software update available for the keyboard that could fix any issues you are experiencing. Check the manufacturer's website to see if there are any updates available.
4. Calibrate the keyboard: Some keyboards have a calibration feature that can be used to fine-tune the tuning of the keys. Check the manual for your keyboard to see if it has this feature and how to use it.

change the whole screen the on capacitor 344 & 544 add resistor with value 2.2k, it will help your keyboard stay longer.

http://music.manualsonline.com/manuals/mfg/yamaha/psr620.html there you go please give me some thumbs up!

Surely there is a circuit board inside every remote control. Usually they are carbon tracked, which cannot be soldered. There is an Ic and an oscilltor crystal too. If the oscilltor crystal [May be of value between 450 to 600Khz], does not work, the there will be no infrared signal-out from the remote control. The Ic used may be ordinary type or suface mount type. If it is an ordinary type you can chage it by hand soldering. If it is a surface mount type it is impossible or very difficult to replace it. Check the infrared light emitting diode fitted at the front of the remote control also. Check its battery contacts. There may be rust of dirt, preventing the proper power supply into the remote control handset.

My keyboard yamaha psr2000,so I want parts silicone rubber keypad 61 and including electronic board,thank you.

rubber contact strip requires replacement

I don't have a parts source for these other than Yamaha. Call them up to get the part number for the board. The sound is usually sent through the headphone jack which acts as a switch when you use headphones. Replacing that board should resolve your problem. If the board is no longer available, it is possible to repair the existing one, but this is a specialty task and not one I would recommend a novice attempt.

Please keep us posted on your progress,
Dan

I've worked on a lot of keyboards and they're all different.
Unless you have the service manual, a good set of electronic tools and have the time, don't attempt it, take it to a keyboard services specialist. If they know what they're doing, you'll get you keyboard back in good working condition.