(see figure 4

INPUT OFFSET ADJUSTMENT

The input amplifiers in the m201 are ultra-precision laser trimmed devices which have a very low input offset. However, even the smallest differential offset at the input can result in an audible “click” when the gain control is turned. It should be noted that this type of click will be audible when no signal is present. With no signal present there is no signal amplitude to be changed unless input offset is present. This procedure nulls the input offset and minimizes the clicking sound with no signal present. In contrast, there will almost always be an audible click if turning the gain control while a signal is present. This is because the gain control, being a stepped control, will make an instan- taneous change in amplitude when turned, which creates a transient signal.

EQUIPMENT NEEDED

•DC Volt meter with at least 1mV sensitivity

•Plastic alignment tool or a small screwdriver

•#2 phillips head screwdriver

PROCEDURE

1) Remove the 8 phillips head screws from the top lid but leave the lid in place.

2) Set all of the preamplifier gain controls to maximum.

3) Turn on the m201 preamplifier and allow to warm up for at least 45 minutes. (go get a nice cup of coffee and do some stretches)

4) Remove the top lid and locate the DC offset test points TP1A and TP2A next page). Place the Volt meter probes into these holes.

5) Locate DC offset potentiometer VR1A (VR1B for channel 2) and rotate it for a read- ing of 0.000VDC +/- 0.003V.

6) The input offset does drift with temperature and having the lid off will allow the circuitry to cool. It is advisable to replace the lid and let the preamplifier warm up again (about 20 minutes) and then re-check your adjustments.

Cleaning

Your m201 preamplifier chassis is constructed out of high quality stainless steel. Under normal circumstances, virtually no maintenance is required to keep the unit looking shiny and new. However, if your unit becomes smudged or dirty, here are some clean- ing tips: We recommend using either Pledge furniture polish or Zep brand stainless steel cleaner (available at the hardware store). Apply cleaner to a clean, dry, lint free cloth and gently wipe all stainless surfaces, taking care not to allow the cleaning prod- uct to build up around the panel switches or knobs.

grace design m201 owner’s manual

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Grace M201 owner manual Cleaning, Input Offset Adjustment
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M201 specifications

The Grace M201 is a remarkable addition to the cutting-edge landscape of mid-range smartphones, designed to offer users an exceptional blend of performance, style, and functionality. Built with a sleek and modern aesthetic, the device features a premium glass and metal body that not only enhances its visual appeal but also provides a lightweight and comfortable grip.

One of the standout features of the Grace M201 is its impressive display. The phone boasts a vibrant 6.5-inch Full HD+ screen, offering a resolution of 2400 x 1080 pixels. This ensures that users experience sharp, clear visuals whether they're watching videos, browsing photos, or playing games. The display is complemented by an IPS panel, providing wide viewing angles and excellent color reproduction, making it an ideal choice for media consumption.

Under the hood, the Grace M201 is powered by a robust octa-core processor that delivers fluid performance and efficient multitasking. Coupled with up to 8GB of RAM, the device can handle demanding applications with ease, while ensuring smooth transitions between apps. Additionally, users can choose from multiple storage options, ranging from 128GB to 256GB, expandable via a microSD card, ensuring ample space for photos, music, and apps.

The Grace M201 excels in the photography department with its versatile triple-camera setup. The primary sensor features a high-resolution lens, allowing users to capture stunning images in a variety of conditions. Accompanying the main camera are an ultra-wide-angle lens and a macro lens, providing users with creative flexibility to explore different photography styles. The front-facing camera is no less impressive, featuring a high-resolution sensor and AI enhancements for beautiful selfies.

Powering the Grace M201 is a robust battery that lasts all day, offering a capacity of around 5000mAh. This ensures users can enjoy their device without the frequent worry of recharging. Fast charging technology is also supported, allowing users to quickly top up their battery when needed.

In terms of connectivity, the Grace M201 is equipped with the latest 4G LTE technology, ensuring fast internet speeds whether streaming, browsing, or gaming. Additionally, the device features dual SIM capabilities, enhancing convenience for users who rely on multiple phone numbers. For security, users can take advantage of advanced biometric options such as facial recognition and fingerprint scanning.

With a blend of advanced features, powerful performance, and an elegant design, the Grace M201 stands out as a desirable choice for anyone in the market for a reliable and feature-rich smartphone.
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